C264 EN T C40 Global

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MiCOM 
C264/C264C 
Bay Computer 
 
Technical Guide 
C264/EN T/C40 
 
 
Technical Guide C264/EN T/C40
 
MiCOM C264/C264C 
 
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MiCOM C264/C264C 
BAY COMPUTER 
CONTENT 
Safety & Handling C264/EN SA/C40
Introduction C264/EN IT/C40
Technical data C264/EN TD/C40
Functional Description C264/EN FT/C40
Hardware Description C264/EN HW/C40
Connection C264/EN CO/C40
Installation C264/EN IN/C40
Settings C264/EN ST/C40
Commissioning C264/EN CM/C40
Commissioning Record Sheet C264/EN RS/C40
Maintenance C264/EN MF/C40
Lexical C264/EN LX/C40
ANNEX: Communication ETHERNET Switches C264/EN AN/C40
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Safety & Handling C264/EN SA/C40
 
MiCOM C264/C264C 
 
 
SAFETY & HANDLING 
Safety & Handling C264/EN SA/C40
 
MiCOM C264/C264C 
 
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CONTENT 
1. INTRODUCTION 3 
 
2. HEALTH AND SAFETY 4 
2.1 Health and Safety 4 
2.2 Installing, Commissioning and Servicing 4 
3. DECOMMISSIONING AND DISPOSAL 6 
 
4. TECHNICAL SPECIFICATIONS FOR SAFETY 7 
 
5. HANDLING OF ELECTRONIC EQUIPMENTS 8 
 
6. PACKING AND UNPACKING 9 
 
7. GUARANTEES 10 
 
8. COPYRIGHTS & TRADEMARKS 11 
8.1 Copyrights 11 
8.2 Trademarks 11 
9. WARNINGS REGARDING USE OF AREVA T&D EAI PRODUCTS 12 
 
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1. INTRODUCTION 
This document is a chapter of the MiCOM C264/C264C documentation binder. It describes 
the safety, handling, packing and unpacking procedures applicable to MiCOM C264/C264C 
modular computer series and associated equipment's and software tools. 
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MiCOM C264/C264C
 
2. HEALTH AND SAFETY 
For all the safety purposes please refer to the AREVA T&D Safety Guide: SFTY/4L M/F11 
(or later issue) and to the following chapters. 
WARNING: THIS SAFETY SECTION SHOULD BE READ BEFORE COMMENCING 
ANY WORK ON THE EQUIPMENT. 
2.1 Health and Safety 
The information in the Safety Section of the product documentation is intended to ensure 
that products are properly installed and handled in order to maintain them in a safe condition. 
It is assumed that everyone who will be associated with the equipment will be familiar with 
the contents of the Safety Section. 
2.2 Installing, Commissioning and Servicing 
Equipment connections 
Personnel undertaking installation, commissioning or servicing work on this equipment 
should be aware of the correct working procedures to ensure safety. The product 
documentation should be consulted before installing, commissioning or servicing the 
equipment. 
Terminals exposed during installation, commissioning and maintenance may present a 
hazardous voltage unless the equipment is electrically isolated. 
If there is unlocked access to the rear of the equipment, care should be taken by all 
personnel to avoid electrical shock or energy hazards. 
Voltage and current connections should be made using insulated crimp terminations to 
ensure that terminal block insulation requirements are maintained for safety. To ensure that 
wires are correctly terminated the correct crimp terminal and tool for the wire size should be 
used. 
Before energising the equipment it must be earthed using the protective earth terminal, or 
the appropriate termination of the supply plug in the case of plug connected equipment. 
Omitting or disconnecting the equipment earth may cause a safety hazard. 
The recommended minimum earth wire size is 2.5mm², unless otherwise stated in the 
technical data section of the product documentation. 
When the protective (earth) conductor terminal (PCT) is also used to terminate cable 
screens, etc., it is essential that the integrity of the protective (earth) conductor is checked 
after the addition or removal of such functional earth connections. 
For M4 stud PCTs the integrity of the protective (earth) connection should be ensured by use 
of a locknut or similar." 
Before energising the equipment, the following should be checked: 
• Voltage rating and polarity; 
• CT circuit rating and integrity of connections; 
• Integrity of earth connection (where applicable) 
Note: The term earth used throughout the product documentation is the direct equivalent of 
the North American term ground. 
Equipment operating conditions 
The equipment should be operated within the specified electrical and environmental limits. 
Current transformer circuits 
Do not open the secondary circuit of a live CT since the high level voltage produced may be 
lethal to personnel and could damage insulation. 
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Insulation and dielectric strength testing 
Insulation testing may leave capacitors charged up to a hazardous voltage. At the end of 
each part of the test, the voltage should be gradually reduced to zero, to discharge 
capacitors, before the test leads are disconnected. 
Insertion of modules and boards 
These must not be inserted into or withdrawn from equipment whist it is energised since this 
may result in damage. 
Fibre optic communication 
Where fibre optic communication devices are fitted, these should not be viewed directly. 
Optical power meters should be used to determine the operation or signal level of the device. 
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3. DECOMMISSIONING AND DISPOSAL 
Decommissioning: 
The auxiliary supply circuit in the MiCOM computers may include capacitors across the 
supply or to earth. To avoid electric shock or energy hazards, after completely isolating the 
supplies to the MiCOM computers (both poles of any dc supply), the capacitors should be 
safely discharged via the external terminals prior to decommissioning. 
Disposal: 
It is recommended that incineration and disposal to watercourses be avoided. The product 
should be disposed of in a safe manner. Any products containing batteries should have them 
removed before disposal, in order to avoid short circuits. Particular regulations within the 
country of operation may apply to the disposal of lithium batteries. 
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4. TECHNICAL SPECIFICATIONS FOR SAFETY 
The recommended maximum rating of the external protective fuse for this equipment is 16A, 
High rupture capacity (HRC) Red Spot type NIT or TIA, or equivalent unless otherwise 
stated in the technical data section of the product documentation. The protective fuse should 
be located as close to the unit as possible. 
1. Fuse rating is dependent of auxiliary voltage and circuit loading. 
2. Differential protective switch on DC power supply is recommended. 
3. Differential protective switch on AC power supply is mandatory (printers, PACiS 
workstation…). 
Protective class: IEC 60255-27: 
 
2005 
 
Class I This equipment requires 
a protective (safety) 
earth connection to 
ensure user safety. 
Installation 
Category: 
IEC 60255-27: 
EN 60255-27: 
 
2005 
2006 
 
 
Installation Category III 
Distribution level, fixed 
installation. 
 Equipment in this 
category is qualification 
tested at 5kV peak, 
1.2/50µs, 500Ω. 0.5J, 
between all supply 
circuits and earth and 
also between 
independent circuits. 
Environment: IEC 60255-27: 
Pollution degree 2 
EN 60255-27: 
2005 
 
2006 
 
 Compliance is 
demonstrated by 
reference to safety 
standards. 
Product Safety: 73/23/EEC Compliance with the 
European Commission 
Low Voltage Directive. 
 
 
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5. HANDLING OF ELECTRONIC EQUIPMENTS 
A person’s normal movements can easily generate electrostatic potentials of several 
thousand volts. 
Discharge of these voltages into semiconductor devices when handling circuits can cause 
serious damage, which often may not be immediately apparent but the reliability of the circuit 
will have been reduced. 
The electronic circuits of AREVA T&D Energy Automation & Information products are 
immune to the relevant levels of electrostatic discharge when housed in their cases. Do not 
expose them to the risk of damage by withdrawing modules unnecessarily. 
Each module incorporates the highest practicable protection for its semiconductor devices. 
However, if it becomes necessary to withdraw a module, the following precautions should be 
taken in order to preserve the high reliability and long life for which the equipment has been 
designed and manufactured. 
1. Before removing a module, ensure that you are a same electrostatic potential as the 
equipment by touching the case. 
2. Handle the module by its front-plate, frame, or edges of the printed circuit board. Avoid 
touching the electronic components, printed circuit track or connectors. 
3. Do not pass the module to any person without first ensuring that you are both at the 
same electrostatic potential. Shaking hands achieves equipotential. 
4. Place the module on an antistatic surface, or on a conducting surface, which is at the 
same potential as you. 
5. Store or transport the module in a conductive bag. 
More information on safe working procedures for all electronic equipment can be found in 
IEC 60147-0F and BS5783. 
If you are making measurements on the internal electronic circuitry of any equipment in 
service, it is preferable that you are earthen to the case with a conductive wrist strap. 
Wrist straps should have a resistance to ground between 500k – 10M Ohms. If a wrist strap 
is not available you should maintain regular contact with the case to prevent the build up of 
static. Instrumentation which may be used for making measurements should be earthen to 
the case whenever possible. 
AREVA T&D Energy Automation & Information strongly recommends that detailed 
investigations on the electronic circuitry, or modification work, should be carried out in a 
Special Handling Area such as described in IEC 60147-0F or BS5783. 
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6. PACKING AND UNPACKING 
All MiCOM C264/C264C computers are packaged separately in their own cartons and 
shipped inside outer packaging. Use special care when opening the cartons and unpacking 
the device, and do not use force. In addition, make sure to remove from the inside carton the 
supporting documents supplied with each individual device and the type identification label. 
The design revision level of each module included with the device in its as-delivered 
condition can be determined from the list of components. This list should be carefully saved. 
After unpacking the device, inspect it visually to make sure it is in proper mechanical 
condition. 
If the MiCOM C264/C264C computer needs to be shipped, both inner and outer packaging 
must be used. If the original packaging is no longer available, make sure that packaging 
conforms to ISO 2248 specifications for a drop height ≤0.8m. 
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7. GUARANTEES 
The media on which you received AREVA T&D EAI software are guaranteed not to fail 
executing programming instructions, due to defects in materials and workmanship, for a 
period of 90 days from date of shipment, as evidenced by receipts or other documentation. 
AREVA T&D EAI will, at its option, repair or replace software media that do not execute 
programming instructions if AREVA T&D EAI receive notice of such defects during the 
guaranty period. AREVA T&D EAI does not guaranty that the operation of the software shall 
be uninterrupted or error free. 
A Return Material Authorisation (RMA) number must be obtained from the factory and clearly 
marked on the package before any equipment acceptance for guaranty work. AREVA T&D 
EAI will pay the shipping costs of returning to the owner parts, which are covered by 
warranty. 
AREVA T&D EAI believe that the information in this document is accurate. The document 
has been carefully reviewed for technical accuracy. In the event that technical or 
typographical errors exist, AREVA T&D EAI reserves the right to make changes to 
subsequent editions of this document without prior notice to holders of this edition. The 
reader should consult AREVA T&D EAI if errors are suspected. In no event shall AREVA 
T&D EAI be liable for any damages arising out of or related to this document or the 
information contained in it. 
Expect as specified herein, AREVA T&D EAI makes no guaranties, express or implied and 
specifically disclaims and guaranties of merchantability or fitness for a particular purpose. 
Customer's rights to recover damages caused by fault or negligence on the part AREVA 
T&D EAI shall be limited to the amount therefore paid by the customer. AREVA T&D EAI will 
not be liable for damages resulting from loss of data, profits, use of products or incidental or 
consequential damages even if advised of the possibility thereof. This limitation of the liability 
of AREVA T&D EAI will apply regardless of the form of action, whether in contract or tort, 
including negligence. Any action against AREVA T&D EAI must be brought within one year 
after the cause of action accrues. AREVA T&D EAI shall not be liable for any delay in 
performance due to causes beyond its reasonable control. The warranty provided herein 
does not cover damages, defects, malfunctions, or service failures caused by owner's failure 
to follow the AREVA T&D EAI installation, operation, or maintenance instructions. Owner's 
modification of the product; owner's abuse, misuse, or negligent acts; and power failure or 
surges, fire, flood, accident, actions of third parties, or other events outside reasonable 
control. 
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8. COPYRIGHTS & TRADEMARKS 
8.1 Copyrights 
Under the copyright laws, this publication may not be reproduced or transmitted in any form, 
electronic or mechanical, including photocopying, recording, storing in an information 
retrieval system, or translating, in whole or in part, without the prior written consent of 
AREVA T&D EAI. 
8.2 Trademarks 
PACiS, PACiS SCE, PACiS ES, PACiS CMT, PACiS SMT, PACiS PS, PACiS SCE, AREVA 
T&D EAI, pacis.biz and pacis.com - are trademarks of AREVA T&D EAI. Product and 
company names mentioned herein are trademarks or trade names of their respective 
companies. 
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9. WARNINGS REGARDING USE OF AREVA T&D EAI PRODUCTS 
AREVA T&D EAI products are not designed with components and testing for a level of 
reliability suitable for use in connection with surgical implants or as critical components in 
any life support systems whose failure to perform can reasonably be expected to cause 
significant injuries to a human. 
In any application, including the above reliability of operation of the software products can be 
impaired by adverse factors, including - but not limited - to fluctuations in electrical power 
supply, computer hardware malfunctions, computer operating system, software fitness, 
fitness of compilers and development software used to develop an application, installation 
errors, software and hardware compatibility problems, malfunctions or failures of electronic 
monitoring or control devices, transient failures of electronic systems (hardware and/or 
software), unanticipated uses or misuses, or errors fromthe user or applications designer 
(adverse factors such as these are collectively termed "System failures"). 
Any application where a system failure would create a risk of harm to property or persons 
(including the risk of bodily injuries and death) should not be reliant solely upon one form of 
electronic system due to the risk of system failure to avoid damage, injury or death, the user 
or application designer must take reasonably steps to protect against system failure, 
including - but not limited - to back-up or shut-down mechanisms, not because end-user 
system is customised and differs from AREVA T&D EAI testing platforms but also a user or 
application designer may use AREVA T&D EAI products in combination with other products. 
These actions cannot be evaluated or contemplated by AREVA T&D EAI; Thus, the user or 
application designer is ultimately responsible for verifying and validating the suitability of 
AREVA T&D EAI products whenever they are incorporated in a system or application, even 
without limitation of the appropriate design, process and safety levels of such system or 
application. 
Introduction C264/EN IT/C40
 
MiCOM C264/C264C 
 
 
INTRODUCTION 
Introduction C264/EN IT/C40
 
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CONTENT 
1. INTRODUCTION TO MiCOM 3 
 
2. INTRODUCTION TO MiCOM GUIDES 4 
2.1 Chapters description 4 
2.1.1 Chapter Safety (SA) 4 
2.1.2 Chapter Introduction (IT) 4 
2.1.3 Chapter Technical Data (TD) 4 
2.1.4 Chapter Functional Description (FT) 4 
2.1.5 Chapter Hardware Description (HW) 4 
2.1.6 Chapter Connection diagrams (CO) 4 
2.1.7 Chapter HMI, Local control and user interface (HI) 4 
2.1.8 Chapter Installation (IN) 4 
2.1.9 Chapter Settings (ST) 4 
2.1.10 Chapter Communications (CT) 5 
2.1.11 Chapter Commissioning (CM) 5 
2.1.12 Chapter Record Sheet (RS) 5 
2.1.13 Chapter Maintenance, Fault finding, Repairs (MF) 5 
2.1.14 Chapter Lexical (LX) 5 
2.1.15 Chapter Applications (AP) 5 
2.2 Operation guide 5 
2.3 Technical guide 5 
3. INTRODUCTION TO MiCOM APPLICATIONS 6 
3.1 MiCOM Computers 6 
3.2 Applications and Scope 6 
 
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1. INTRODUCTION TO MiCOM 
MiCOM is a comprehensive solution capable of meeting all electricity supply requirements. It 
comprises a range of components, systems and services from AREVA T&D Energy 
Automation & Information. 
Central to the MiCOM concept is flexibility. 
MiCOM provides the ability to define an application solution and, through extensive 
communication capabilities, to integrate it with your power supply control system. 
The components within MiCOM are: 
• P range protection relays; 
• C range control products; 
• M range measurement products for accurate metering and monitoring; 
• S range versatile PC support and substation control packages. 
• A range industrial PC 
MiCOM products include extensive facilities for recording information on the state and 
behaviour of the power system using disturbance and fault records. They can also provide 
measurements of the system at regular intervals to a control centre enabling remote 
monitoring and control to take place. 
The MiCOM range will continue to be expanded. The general features of MiCOM will also be 
enhanced, as we are able to adopt new technology solutions. 
For up-to-date information on any MiCOM product, visit our website: www.areva-td.com 
 
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MiCOM C264/C264C
 
2. INTRODUCTION TO MiCOM GUIDES 
The guides provide a functional and technical description of the MiCOM C264/C264C 
computers and a comprehensive set of instructions for the computer’s use and application. 
MiCOM guidesare divided into two volumes, as follows: 
Operation Guide: includes information on the application of the computers and a technical 
description of its features. It is mainly intended for protection & control engineers concerned 
with the selection and application of the computers for the Control, Monitoring, Measurement 
and Automation of electrical power processes. 
Technical Guide: contains information on the installation and commissioning of the 
computer, and also a section on fault finding. This volume is intended for site engineers who 
are responsible for the installation, commissioning and maintenance of the MiCOM 
C264/C264C computer. 
2.1 Chapters description 
2.1.1 Chapter Safety (SA) 
This chapter contains the safety instructions, handling and reception of electronic equipment, 
packing and unpacking parts, Copyrights and Trademarks. 
Chapters on product definition and characteristics 
2.1.2 Chapter Introduction (IT) 
This is this document containing the description of each chapter of the MiCOM computer 
guides. It is a brief introduction to MiCOM computer capabilities. 
2.1.3 Chapter Technical Data (TD) 
This chapter contains the technical data including, accuracy limits, recommended operating 
conditions, ratings and performance data. 
It also describes environment specification, compliance with technical standards. 
2.1.4 Chapter Functional Description (FT) 
This chapter contains a description of the product. It describes functions of the MiCOM 
computer. 
2.1.5 Chapter Hardware Description (HW) 
This chapter contains the hardware product description (product identification, case, 
electronic boards, operator interface, etc.). 
2.1.6 Chapter Connection diagrams (CO) 
This chapter contains the external wiring connections to the C264/C264C computers. 
2.1.7 Chapter HMI, Local control and user interface (HI) 
This chapter contains the operator interface description, Menu tree organisation and 
navigation, LEDs description, Setting/configuration software. 
Set of chapter upon Computer installation 
2.1.8 Chapter Installation (IN) 
This chapter contains the installation procedures. 
2.1.9 Chapter Settings (ST) 
This chapter contains the list of the setting with default values and range. 
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2.1.10 Chapter Communications (CT) 
This chapter provides the companion standard of all supported protocols toward SCADA 
(Telecontrol BUS) and IED on LBUS. This is the list of protocol function that computer use in 
this communication. 
User minimal actions 
2.1.11 Chapter Commissioning (CM) 
This chapter contains instructions on how to commission the computer, comprising checks 
on the settings and functionality of the computer. 
2.1.12 Chapter Record Sheet (RS) 
This chapter contains record sheet to follow the maintenance of the computer. 
2.1.13 Chapter Maintenance, Fault finding, Repairs (MF) 
This chapter advises on how to recognise failure modes, fault codes and describes the 
recommended actions to repair. 
2.1.14 Chapter Lexical (LX) 
This chapter contains lexical description of acronyms and definitions. 
2.1.15 Chapter Applications (AP) 
Comprehensive and detailed description of the features of the MiCOM C264/264C including 
both the computer elements and the other functions such as transducerless (CT/VT) 
measurements, events and disturbance recording, interlocking and programmable scheme 
logic. This chapter includes a description of common power system applications of the 
MiCOM C264/C264C computer, practical examples of how to do some basic functions, 
suitable settings, some typical worked examples and how to apply the settings to the 
computer. 
2.2 Operation guide 
This binder contains the following chapters: 
SA, IT, TD, FT, HW, CO, HI, AP, LX. 
2.3 Technical guide 
This binder contains the following chapters: 
SA, IT, TD, FT, HW, CO, IN, ST, CT, CM, RS, MF, LX. 
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MiCOM C264/C264C3. INTRODUCTION TO MiCOM APPLICATIONS 
AREVA philosophy is to provide a range of computers, gateways and IEDs products. Each of 
these products can be used independently, or can be integrated to form a PACiS system, a 
Digital Control System (DCS) or a SCADA system. 
3.1 MiCOM Computers 
Driven by the requirements around the world for advanced applications in SCADA, Digital 
Control Systems, Automation, control and monitoring, AREVA has designed and developed 
a complete range of computer products, MiCOM C264 specifically for the power process 
environment and electric utility industry. It allows building a personalised solution for Control, 
Monitoring, Measurement and Automation of electrical processes. 
MiCOM C264/C264C computers range are designed to address the needs of a wide range 
of installations, from small to large and customer applications. Emphasis has been placed on 
strong compliance to standards, scalability, modularity and openness architecture. These 
facilitate use in a range of applications from the most basic to the most demanding. They 
also ensure interoperability with existing components and, by providing building computers, 
PLC or IEDs approach, provide a comprehensive upgrade path, which allows PACiS 
capabilities to track customer requirements. 
Key features are that this computer family is based on a Ethernet client/server architecture, 
its a modular computer that offers a large variety of applications such as Bay Computer, 
Remote Terminal Unit, Sequence of Event Recorder, Data Concentrator and Programmable 
Logic Controller. 
Phase in time, dedicated computer available for each application will be purposed. 
3.2 Applications and Scope 
The MiCOM C264/C264C modular bay controller, RTU or PLC is used to control and monitor 
switchbays. The information capacity of the MiCOM C264/C264C is designed for controlling 
operated switchgear units equipped with electrical check-back signalling located in medium-
voltage or high-voltage substations. 
External auxiliary devices are largely obviated by the integration of binary inputs and power 
outputs that are independent of auxiliary voltages, by the direct connection option for current 
and voltage transformers, and by the comprehensive interlocking capability. 
This simplifies handling of bay protection and control technology from planning to station 
commissioning. During operation, the user-friendly interface makes it easy to set the unit and 
allows safe operation of the substation by preventing non-permissible switching operations. 
Continuous self-monitoring reduces maintenance costs for protection and control systems. 
A built-in liquid crystal display (optional front face with LCD) shows not only switchgear 
settings but also measured data and monitoring signals or indications. 
The bay is controlled interactively by using the control keys and the display. 
Adjustment to the quantity of information required is made via the PACiS System 
Configurator Editor (PACiS SCE). 
The MiCOM C264/C264C can be connected to a higher control level, local control level or 
lower levels by way of a built-in communications interface. 
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C0001ENc
Fast Ethernet
IEC 61850 
Master clock
(GPS)
I/Os
WEB access
COMMON BAY
 
MV FEEDER BAYS
HV FEEDER BAY
MV FEEDER BAYS
C264C
SCADA Interface
DNP3 & IEC 60870-5-101
& IEC 60870-5-104
Cubicle/ Switchboard
integration
C264
C264
C264C
Operator
Interface
Main protection
EHV FEEDER BAY
I/Os
TRANSFORMER BAY
 
FIGURE 1 : TYPICAL USE OF A MiCOM C264 – BAY CONTROLLER 
Remote
HMI
PSTN or
dedicated
line
NP3,
DBUS,
IE 0-5-103,
I 870-5-101
PLC
M720
Px20
Px30
BC
C0002ENb
Px30
Px40
I/Os
I/Os
SCADA Interface
DNP3 & IEC 60870-5-101
& IEC 60870-5-104
 
FIGURE 2 : TYPICAL USE OF A MiCOM C264 – RTU, DATA CONCENTRATOR APPLICATION 
The figures show some typical cases that can be mixed to face specific constraint. Two 
examples can illustrate this case: 
• The system application on “figure 1” uses several C264 with several communication 
links to SCADA (one per voltage level for example). 
• RTU application can use several C264 linked together on SBUS Ethernet. One of the 
C264 RTUs is in charge of the concentration of data and of the communication with 
the remote SCADA. 
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Technical Data C264/EN TD/C40
 
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TECHNICAL DATA 
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CONTENT 
1. SCOPE OF THE DOCUMENT 3 
 
2. CONFORMITY 4 
 
3. GENERAL DATA 5 
3.1 Design 5 
3.2 Installation Position 5 
3.3 Degree of Protection 5 
3.4 Weight 5 
3.5 Dimensions and Connections 5 
3.6 Terminals 5 
3.7 Creepage Distances and Clearances 6 
4. RATINGS 7 
4.1 Auxiliary Voltage 7 
4.2 Digital inputs 7 
4.2.1 DIU200 7 
4.2.2 DIU210 8 
4.2.3 DIU220 9 
4.2.4 CCU200 10 
4.2.5 Digital outputs 10 
4.2.6 DOU200 10 
4.2.7 CCU200 11 
4.2.8 BIU241 11 
4.3 Analogue inputs 11 
4.3.1 AIU201 11 
4.3.2 AIU210 12 
4.3.3 AIU211 13 
4.4 CT/VT inputs 13 
4.4.1 TMU200/TMU220 - Currents 13 
4.4.2 TMU200/TMU220 Voltages 14 
4.4.3 TMU200/TMU220 - A/D converter 14 
4.4.4 ECU200/ECU201 14 
5. BURDENS 15 
5.1 Auxiliary Voltage 15 
5.2 Power supply 15 
5.3 CPU boards 15 
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5.4 Digital inputs 15 
5.4.1 DIU200 15 
5.4.2 DIU210 15 
5.4.3 DIU220 16 
5.4.4 CCU200 16 
5.5 Digital outputs 17 
5.5.1 DOU200 17 
5.5.2 CCU200 17 
5.6 Analogue inputs 17 
5.7 Ethernet Switches 17 
5.8 CT/VT inputs 17 
5.9 Front panels 17 
6. ACCURACY 18 
6.1 Reference Conditions 18 
6.2 Measurement Accuracy 18 
7. TYPE TESTS 19 
7.1 Dielectric Withstand 19 
7.2 Mechanical Test 19 
7.3 Atmospheric Test 20 
7.4 “DC” Auxiliary Supply Test 20 
7.5 “AC” Auxiliary Supply Test 21 
7.6 EMC 21 
 
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1. SCOPE OF THE DOCUMENT 
This document is a chapter of MiCOM C264 documentation binders, describing the 
Technical data of this computer. 
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MiCOM C264/C264C
 
2. CONFORMITY 
(Per Article 10 of EC Directive 73/23/EEC). 
The product designated “MiCOM C264/C264C computer” has been designed and 
manufactured in conformance with the standard IEC 60255-27:2005 and is compliant with 
the European Commission Low Voltage Directive 73/23/EEC. 
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3. GENERAL DATA 
3.1 Design 
Surface-mounted case suitable for wall installation or flush-mounted case for 19” cabinets 
and for control panels. 
3.2 Installation Position 
Vertical ±15° 
3.3 Degree of Protection 
Per DIN VDE 0470 and EN 60255-27:2006 or IEC 60255-27:2005. 
IP52 for the front panel with LCD or Leds. 
IP10 for the “blind” front panel (GHU220,GHU221). 
IP50 for the body case of MiCOM C264C. 
IP20 for the rack of MiCOM C264. 
IP20 for rear panels of C264/C264C, except reduced to IP10 when the black MiDOS 28 way 
terminal block is mounted (for TMU200 ,TMU210 and TMU220 boards). 
3.4 Weight 
Case 40 TE: approx. 4 kg 
Case 80 TE: approx. 8 kg 
3.5 Dimensions and Connections 
See dimensional drawings (Hardware description section – C264_EN_HW) and terminal 
connection diagrams (C264_EN_CO). 
3.6 Terminals 
PC Interface: 
DIN 41652 connector, type female D-Sub, 9-pin on the front panel. 
A direct wired cable is required. 
Ethernet LAN (in the rear panel through the CPU260 board): 
RJ-45 female connector, 8-pin for the 10/100Base-T self-negotiation. 
ST female connector for the 100Base-F.IRIG-B Input (optional, in the rear panel through the CPU260 board): 
BNC plug. 
Conventional communication links: 
M3 threaded terminal ends, self-centring with wire protection for conductor cross sections 
from 0.2 to 2.5 mm² for BIU241 board. 
DIN 41652 connector; type D-Sub, 9-pin on the CPU260 board in the rear panel. 
Optical fibres trough ECU200 (external RS232/optical converter): optical plastic fibre 
connection per IEC 874-2 or DIN 47258 or ST ® glass fibre optic connection (ST ® is a 
registered trademark of AT&T Lightguide Cable Connectors). 
Inputs /Outputs or power supply modules: 
M3 threaded terminal ends, self-centring with wire protection for conductor cross sections 
from 0.2 to 2.5 mm² for DIU200, DIU210, DIU220, DOU200, CCU200, AIU201, AIU210, 
AIU211 and BIU241 boards. 
The I/O boards and BIU241 are equipped with a 24-way 5.08 mm pitch male connector. 
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MiCOM C264/C264C
 
Current-measuring and Voltage-measuring inputs: 
M5 threaded terminal ends, self-centring with wire protection for conductor cross sections 
between 2.5 and 4 mm² for TMU200 Transducerless (4CT+4VT) board. 
The TMU200 (4CT+4VT) board is equipped with a “MiCOM: ASSEMBLY CONNECTEUR 
BLOCKL GJ104” connector. 
3.7 Creepage Distances and Clearances 
Per IEC 60255-27:2005 and IEC 664-1:1992. 
Pollution degree 2, working voltage 250 V. 
Overvoltage category III, impulse test voltage 5 kV. 
Technical Data C264/EN TD/C40
 
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4. RATINGS 
4.1 Auxiliary Voltage 
MiCOM C264/C264C computers are available in four auxiliary voltage versions, specified in 
the table below: 
Version Nominal ranges Operative DC range Operative AC range 
A01 24 VDC 19.2 – 28.8 V - 
A02 48 to 60 VDC 38.4 – 72 V - 
A03 110 to 125 VDC 88 – 150 V - 
A04 220 VDC and 230 VAC 176 – 264 V 176 – 264 V 
The nominal frequency (Fn) for the AC auxiliary voltage is dual rated at 50/60Hz, the operate 
range is 45Hz to 65Hz. 
The main characteristics of the BIU241 board are: 
• Power supply: 40 W 
• Nominal output voltage: + 5V 
• Supply monitoring 
• Power loss withstands capacity: 50 ms 
• Protection against polarity reversal 
• Insulation resistance: >100 MΩ ( CM) at 500 VDC 
• Dielectric withstand: 2 kV (CM) – 50 Hz for 1minute 
4.2 Digital inputs 
4.2.1 DIU200 
The DIU200 board is available in four nominal voltage versions that characteristics are 
specified in the table below. 
The DIU200 board has 16 digital inputs. 
Version Nominal voltage (+/-20%) Triggering threshold (VDC) 
A01 24 VDC if V >10.1 VDC Input status is set 
if V < 5 VDC Input status is reset 
A02 48 to 60 VDC if V >17.4 VDC Input status is set 
if V < 13.5 VDC Input status is reset 
A03 110 to 125 VDC if V > 50 VDC Input status is set 
if V< 34.4 VDC Input status is reset 
A04 220 VDC if V > 108 VDC Input status is set 
if V< 63 VDC Input status is reset 
 
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The DIU200 board is designed to allow 2 inputs serially connected. This answers to the 
following need: 
C0124ENa
C264
IN1 IN2
0 VDC
Un
R
 
If R is open then IN1 and IN2 are set. 
If R is closed then IN1 is set, IN2 is reset. 
With this scheme, when IN1 is reset, this means that there is a problem into the external 
wiring. 
The input current at nominal voltage is detailed in chapter 5.4. 
There are at maximum 15 DIU boards (including DIU200 and DIU210) inside a C264 rack. 
4.2.2 DIU210 
The DIU210 board works for all voltages between 48 VDC and 220 VDC (+/- 20%). 
The DIU210 board has 16 digital inputs. 
Whichever voltage, the triggering threshold is 19VDC 
The maximum number of DIU210 board in one C264 rack depends on the rack type and on 
the voltage level of inputs. 
Please refer to the following table: 
 Maximum 
DIU210 boards in 40TE racks
Maximum 
DIU210 boards in 80TE racks
24V 2 8 
48V 6 15 
110-125V 3 10 
220V 1 5 
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The DIU210 board is designed to allow 2 inputs serially connected. This answers to the 
following need: 
C0124ENa
C264
IN1 IN2
0 VDC
Un
R
 
If R is open then IN1 and IN2 are set. 
If R is closed then IN1 is set, IN2 is reset. 
With this scheme, when IN1 is reset, this means that there is a problem into the external 
wiring. 
The input current at nominal voltage is detailed in chapter 5.4. 
There are at maximum 15 DIU boards (including DIU200 and DIU210) inside a C264 rack. 
4.2.3 DIU220 
The DIU210 board works for voltages 48/60 VDC and 110/125 VDC (+/- 20%). 
The DIU210 board has 16 digital inputs. 
For voltage 48/60 VDC the triggering threshold is from 13.8 VDC to 17.9 VDC 
For voltage 110/125 VDC the triggering threshold is from 35.8 VDC to 52.3 VDC
 
The maximum number of DIU220 board in one C264 rack depends on the rack type and on 
the voltage level of inputs. 
Please refer to the following table: 
 Maximum 
DIU220 boards in 40TE racks
Maximum 
DIU220 boards in 80TE racks
48/60V 6 15 
110/125V 3 10 
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4.2.4 CCU200 
For versions A1 to A4 of the CCU200 board the characteristics of the eight inputs are the 
same as the DIU200 board. 
For version A7 of the CCU board the characteristics of the eight inputs are: 
• nominal voltage ( +/- 20%): 110-125 Vcc with 
• triggering threshold: if Vinput > 86 VDC input status is set 
• triggering threshold: if Vinput < 67 VDC input status is reset 
Maximum number of CCU200 boards to be installed in the C264 racks: 
• 15 in the C264 racks (80TE) not equiped with a TMUxxx board 
• 14 in the C264 racks(80TE) equiped with a TMUxxx board (CCU is not to be installed 
in Slot P) 
• 6 in the C264C racks (40TE) not equiped with a TMUxxx board 
• 3 in the C264C racks (40TE) equiped with a TMUxxx board (CCU is not to be installed 
in slot F) 
4.2.5 Digital outputs 
4.2.6 DOU200 
The characteristics of the Output Relay Contacts of the DOU200 board are specified in the 
table below: 
Features Values 
Nominal operating voltage range 24V to 250 VDC / 230 VAC 
Make 2.5A 
Carry 2.5A continuous 
30 A for 500 ms or 250 A for 30 ms 
Break DC: 50 W resistive, 15 W inductive (L/R = 20 ms) 
AC: 1250 VA resistive, 1250 VA inductive (cos Φ = 0,7) 
In these conditions, the contact resistance is still lower 
than 250 mΩ for 10000 operations. 
Operating time Break < 7 ms 
8 simple pole contacts Normally open 
2 double pole contacts 1 Normally open +1 Normally close 
• Isolation: 2 kV (CM)– 50 Hz-for 1 min. 
• The board is designed and monitored to avoid inadvertent controls. 
• There are at maximum 15 DOU200 boards inside a C264 rack. 
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4.2.7 CCU200 
The characteristics of the 4 Output Relay Contacts of the CCU200 board are specified in the 
table below: 
Each relay of the CCU board has double pole contacts. To get the characteristics described 
below, the two output contacts of each relay are to be wired in serial. 
Features Values 
Nominal operating voltage range 24 to 250 VDC / 230 VAC 
Make 5A 
Carry 5A continuous 
30 A for 500 ms or 250 A for 30 ms 
Break 
 
DC: 100 W resistive, 30 W inductive (L/R = 40 ms) 
AC: 1250 VA resistive, 1250 VA inductive (cos Φ = 0,7)
In these conditions, the contact resistance is still lower 
than 250 mΩ for 10000 operations 
Operating time Break < 7 ms 
Double pole contacts Normally open 
• Isolation: 2 kV(CM) – 50 Hz for 1 min. 
• The board is designed and monitored to avoid inadvertent controls. 
• There are at maximum 15 CCU200 boards inside a C264 rack. 
4.2.8 BIU241 
The characteristics ofthe Watchdog Relay Contacts of the BIU241 board are the same as 
the contacts “NO+NC” contacts of the DOU200 board. 
The characteristics of the two output relays used for C264 redundancy are the same as the 
single pole one on the DOU200 board. 
4.3 Analogue inputs 
4.3.1 AIU201 
The AIU201 board provides 4 independent analogue inputs. Each AI can be configured in 
voltage or current range individually as specified in the table below: 
Type Ranges 
Current input range ±1mA 
±5 mA 
±10 mA 
±20 mA 
4-20 mA 
Voltage input range ± 1,25V 
±2,5V 
± 5 V 
± 10V 
Sampling period 100 ms 
Accuracy 0,1% full scale at 25°C 
AD conversion 16 bits (15bits+sign) 
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MiCOM C264/C264C
 
Type Ranges 
Common mode rejection ratio (CMMR) > 100dB 
Serial mode rejection ratio (SMMR) > 40dB 
gains range (user-selectable) 1, 2, 4, 10 
Input impedance for voltage inputs 11 KΩ 
Input impedance for current inputs 75 Ω 
Temperature derive: up to 30ppm/°C. 
The ranges are defined during the configuration phase. 
The current/voltage selection is done by choosing the input number of the connector. 
There are at maximum 6 AIU boards (including AIU201 and AIU210) inside a C264 rack. 
4.3.2 AIU210 
The AIU210 board provides 8 analogue inputs (1 common point for two inputs). Each AI can 
be configured in the current range as specified in the table below: 
Type Ranges 
Current input range ±1mA 
±5 mA 
±10 mA 
±20 mA 
 4-20 mA 
Sampling period 100 ms 
Accuracy 0,1% full scale at 25°C 
AD conversion 16 bits (15 bits+sign) 
Common mode rejection ratio (CMMR) > 100dB 
Serial mode rejection ratio (SMMR) > 40dB 
gains range (user-selectable) 1, 2, 4, 10 
Input impedance for current inputs 75 Ω 
Temperature derive: up to 30ppm/°C. 
The ranges are configured during the configuration phase. 
The current selection is done by choosing the input number of the connector. 
A maximum of 6 AIU boards (including AIU201,,AIU210 and AIU211) can be installed inside 
a C264 rack. 
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4.3.3 AIU211 
The AIU211 board provides 8 analogue inputs (1 common point for two inputs). Each AI can 
be configured in the current range as specified in the table below: 
Type Ranges 
Current input range ±1mA 
±5 mA 
±10 mA 
±20 mA 
4-20mA 
Sampling period 100 ms 
Accuracy 0,1% full scale at 25°C 
AD conversion 16 bits (15 bits+sign) 
Common mode rejection ratio (CMMR) > 100dB 
Serial mode rejection ratio (SMMR) > 40dB 
gains range (user-selectable) 1, 2, 4, 10 
Input impedance for current inputs 75 Ω 
Temperature derive: up to 30ppm/°C. 
The ranges are configured during the configuration phase. 
The current selection is done by choosing the input number of the connector. 
A maximum of 6 AIU boards (including AIU201,,AIU210 and AIU211) can be installed inside 
a C264 rack. 
4.4 CT/VT inputs 
The TMU200 board provides 4 Current Transformer (CT) inputs and 4 Voltage Transformer 
(VT) Inputs. 
The TMU220 board provides 4 Current Transformer (CT) inputs and 5 Voltage Transformer 
(VT) Inputs. 
4.4.1 TMU200/TMU220 - Currents 
There are two available nominal currents with two different allocations on the terminal block. 
The four measurement Current Transformers (4 CT) inputs have the following 
characteristics: 
Operating range 
Features 
1 A 5 A 
Nominal AC current (IN) 1 Arms 5 Arms 
Minimum measurable current with same 
accuracy 
0.2 Arms 0.2 Arms 
Maximum measurable current 4 Arms (4*In) 20 Arms (4*In) 
Frequency 50 or 60 Hz ± 10% 50 or 60 Hz ± 10% 
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MiCOM C264/C264C
 
CT load rating: 
Withstand 
Duration 
1 A 5 A 
3 second (not measurable, without destruction) 6 Arms (6*In) 30 Arms (6*In) 
1 second (not measurable, without destruction) 20 Arms (20*In) 100 Arms (20*In) 
 
4.4.2 TMU200/TMU220 Voltages 
The measurement Voltage Transformers ( or 5VT) inputs have the following characteristics: 
Features Operating range 
Nominal AC voltage (VN) range 57.73 Vrms to 500 Vrms. 
Minimum measurable voltage 7 Vrms 
Maximum measurable voltage 577 Vrms 
Frequency operating range 50 or 60 Hz ± 10% 
VT load rating: 
Duration Withstand 
10 second without destruction 880 Vrms 
 
4.4.3 TMU200/TMU220 - A/D converter 
The A/D converter of the TMU200/TMU220 boards has the following characteristics: 
Features Values 
Width 16 bits 
Conversion period < 30 µs 
Scanning period 64 samples/period 
Linearity error ± 2 LSB 
SINAD ratio up to 1kHz 0db 
Low passed filter at 1khz -40db/decade 
 
4.4.4 ECU200/ECU201 
Dielectric withstands: 
Type Test description Type Test Standard Conditions 
Insulation Resistance IEC 60255-5 (2000) 100 MΩ at 500 Vdc (CM & DM) 
(between groups) 
 
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5. BURDENS 
5.1 Auxiliary Voltage 
The MiCOM C264/C264C computer burdens are specified in the table below: 
Version Nominal Maximum 
C264C 15W 22W 
C264 20W 40W 
5.2 Power supply 
The BIU241 board burden on the internal 5V bus is 1,25W. This takes into account 
watchdog, redundancy relays and communication ports. 
The efficiency of the power supply is 78%. 
5.3 CPU boards 
The CPU260 board (also named CPU type 2 or CPU2) burden on the internal 5V and 12V 
bus is 3,3W. 
The CPU270 board (also named CPU type 3 or CPU3) burden on the internal 12V bus is 
2,7W. 
5.4 Digital inputs 
5.4.1 DIU200 
The DIU200 inputs burdens are specified in the table below: 
Version Nominal voltage Current at Un (mA) 
A01 24 VDC 3.5 
A02 48 to 60 VDC 5 for 48 VDC 
6.8 for 60 VDC 
A03 110 to 125 VDC 2.5 for 110 VDC 
3 for 125 VDC 
A04 220 VDC 2 
The DIU200 board burden on the internal 5V bus is 75mW 
5.4.2 DIU210 
The DIU210 inputs burdens are specified in the table below: 
Nominal voltage Current at Un (mA) 
24 VDC >25 
48 to 60 VDC 3.8 
110 to 125 VDC 4 
220 VDC 4.1 
The DIU210 board burden on the internal 5V bus is 75mW. 
Power consumption per input: 
Un = 24VDC to 110V DC: 0,5W ± 30% per input 
Un > 110VDC: 5mA ± 30% 
From 48Vdc to 220Vdc voltage, a high current consumption is created on binary inputs 
during a short period and circulates through external binary contacts to clean them. See the 
peak current response curve. 
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MiCOM C264/C264C
 
WARNING: FOR THE 24V VOLTAGE, THERE IS NO SHORT PEAK CURRENT 
BECAUSE OF THE PERMANENT HIGH CONSUMPTION ON INPUTS 
>25mA. 
The current peak response curve. 
C0159ENa
Tension (V)
Cu
rr
en
t (m
A)
35
30
25
20
15
10
5
0
0 50 100 150 200 250 300
 
 
5.4.3 DIU220 
The DIU220 inputs burdens are specified in the table below: 
Nominal voltage Current at Un (mA) 
48 to 60 VDC 5.22 
110 to 125 VDC 2.6 
The DIU220 board burden on the internal 5V bus is 75mW. 
Power consumption per input: 
Un = 48/60VDC: 0,66W ± 30% per input 
Un = 110/125VDC: 0.62 W ± 30% per input 
5.4.4 CCU200 
The CCU200 inputs consumption is specified in the table below: 
Version Nominal voltage Current at Un (mA) 
A01 24 VDC 3.5 
A02 48 to 60 VDC 5 for 48 VDC 
6.8 for 60 VDC 
A03 110 to 125 VDC 2.5 for 110 VDC 
3 for 125 VDC 
A04 220 VDC 2 
A07 110 to 125 VDC 3.4 for 110VDC 
5.4 for 132VDC 
Technical Data C264/EN TD/C40
 
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5.5 Digital outputs 
5.5.1 DOU200 
The DOU200 board burden on the internal 5V bus is 250mW plus 200mW per activated 
relay. 
5.5.2 CCU200 
The CCU200 board burden on the internal 5V bus is 400mW plus 200mW per activated 
relay. 
5.6 Analogue inputs 
The AIU201 and the AIU210 boards burden on theinternal 5V bus is 1 W. 
5.7 Ethernet Switches 
The SWU20x board burden on the internal 5V bus is 3,85W with 2 optical ports. 
The SWR20x board burden on the internal 5V bus is 4 W. 
The SWD202/SWD204 board burden on the internal 5V bus is 4W. 
5.8 CT/VT inputs 
The TMU200/TMU220 burdens on the internal transformers are specified in the table below: 
Nominal consumption (VA) CT burden (at nominal current – IN) 
 TMU200 TMU220 
1A < 0.1 < 0.02 
5A < 0.5 < 0.2 
 
VT burden (at nominal voltage – VN ) Nominal consumption (VA) 
 TMU200 TMU220 
Vn = 130 Veff <0.1 < 0.01 
The TMU200 board burden on the internal 5V bus is 600mW. 
The TMU220 board burden on the internal 5V bus is 300mW. 
5.9 Front panels 
The GHU200 and GHU210 board burden on the internal 5V bus is 600mW when the LCD 
screen is not back-lighted and 3W when the LCD screen is back-lighted. 
The GHU201 and GHU211 board burden on the internal 5V bus is 600mW. 
The GHU202 and GHU212 board burden on the internal 5V bus is <1mW. 
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MiCOM C264/C264C
 
6. ACCURACY 
For all specified accuracy, the repeatability is ± 2.5% unless otherwise specified. 
If no range is specified for the validity of the accuracy, then the specified accuracy shall be 
valid over the full setting range. 
6.1 Reference Conditions 
Quantity Reference conditions Test tolerance 
General 
Ambient temperature 20 °C ±2 °C 
Atmospheric pressure 86kPa to 106kPa - 
Relative humidity 45 to 75 % - 
Input energising quantity 
Current IN ±5% 
Voltage VN ±5% 
Frequency 50 or 60Hz ±0.5% 
Auxiliary supply 24VDC, 48VDC-60VDC, 
110VDC-125VDC, 
220VDC 
230VAC 
±5% 
 
6.2 Measurement Accuracy 
The TMU200 board has the following characteristics: 
Quantity Accuracy 
Current 0.2% full scale 
Voltage 0.2% full scale 
Frequency ± 0.01 Hz 
Amplitude < 1% 
Phase ± 1° 
Overall temperature coefficient ± 10 ppm/°C 
Harmonics 15H 
Technical Data C264/EN TD/C40
 
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7. TYPE TESTS 
7.1 Dielectric Withstand 
Type Test Name Type Test Standard Conditions 
Insulation Resistance IEC 60255-5 (2000) 100 MΩ at 500 Vdc (CM & DM) 
Dielectric Withstand IEC60255-5 (2000) 
IEEE C37.90 (1989) 
50 Hz for 1mn, 2kV (CM), 1kV (DM) 
High Voltage Impulse 
Test 
IEC 60255-5 (2000) 5 kV CM & 3 kV DM 
 
7.2 Mechanical Test 
Type Test Name Type Test Standard Conditions 
2 falls of 5 cm (Computer not powered) Free Fall Test 
Free Fall Packaging 
Test 
IEC 60068-2-31 (1969) 
+ A1 (1982) 
IEC 60068-2-32 (1975) 
+A1 (1982) + A2 
(1990) 
25 falls of 50 cm (Packaging computer) 
Vibration Response – 
Powered On 
IEC 60255-21-1 (1988) Class 2: 
Acceleration: 1g from 10 to 150Hz 
Vibration Response – 
Not Powered On 
IEC 60255-21-1 (1988) Class 2: 
Acceleration: 2g from 10 to 500Hz 
Vibration Endurance – 
Not Powered On 
IEC 60068-2-6 (1995) Class 2: 
Acceleration: 1g from 10 to 500Hz 
Shocks – Not Powered 
On 
IEC 60255-21-2 (1988) Class 1: 
15g, 11 ms 
Shocks – Powered On IEC 60255-21-2 (1988) Class 2: 
10g, 11 ms 
Bump Test – Not 
Powered On 
IEC 60255-21-2 (1988) Class 1: 
10g, 16ms, 2000/axis 
Seismic Test – Powered 
On 
IEC 60255-21-3 (1993) Class 2: 
Acceleration: 2g 
Displacement: 7.5mm upon axe H 
Acceleration: 1g 
Displacement: 3.5mm upon axe V 
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MiCOM C264/C264C
 
7.3 Atmospheric Test 
Type Test Name Type Test Standard Conditions 
Damp Heat Test – 
Operating 
IEC 60068-2-3 (1969) Test Ca: 
+40°C / 10 days / 93% RH 
Cold Test - Operating IEC 60068-2-1 (1990) Test Ab: - 25°c / 96 H 
Cold Test - Storage IEC60068-2-1 (1990) Test Ad: 
-40°C / 96h 
Powered On at –25°C (for information) 
Dry Heat Test – 
Operating 
IEC 60068-2-2 (1974) 70°c / 24 H 
Dry Heat Long Test – 
Operating 
DICOT HN 46-R01-06 
(1993) 
55°c / 10 days 
Dry Heat Test – Storage IEC 60068-2-1 (1990) Test Bd: 
+70°C / 96h 
Powered On at +70°C 
Enclosure Protection IEC 60529 (1989) + A1 
(1999) 
Front: IP=52 
 
7.4 “DC” Auxiliary Supply Test 
Type Test Name Type Test Standard Conditions 
Inrush current (start-up) DICOT HN 46-R01-4 
(1993) 
T < 1.5 ms / I < 20 A 
1.5ms < T < 150 ms / I < 10 A 
T > 500 ms / I < 1.2 In 
Supply variation IEC 60255-6 (1988) Vn ± 20% 
Vn+30% & Vn-25% for information 
Overvoltage (peak 
withstand) 
IEC 60255-6 (1988) 1.32 Vn max 
2 Vn during 10 ms (for information) 
Ramp down to zero N/A From Vn down to 0 within 1 minute 
From Vn down to 0 within 100 minutes 
Ramp up from zero N/A From 0 up to Vn within 1 minute 
From 0 up to Vn within 100 minutes 
Supply interruption IEC 60255-11 (1979) From 2.5 ms to 1 s at 0.8 Vn 
50 ms at Vn, no malfunction 
Reverse polarity N/A Polarity – for the lower potential of the 
supply 
Polarity + for the lower potential of the 
supply 
Ripple (frequency 
fluctuations) 
IEC 60255-11 (1979) 12% Vn at f=100Hz or 120Hz 
12% Vn at f=200Hz for information 
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7.5 “AC” Auxiliary Supply Test 
Type Test Name Type Test Standard Conditions 
Supply variations IEC 60255-6 (1988) Vn ± 20% 
AC Voltage dips & short 
interruptions 
EN 61000-4-11 (1994) 2ms to 20ms & 50ms to 1s 
50 ms at Vn, no malfunction 
Frequency fluctuations IEC 60255-6 (1988) 50 Hz: from 47 to 54 Hz 
60 Hz: from 57 to 63 Hz 
Voltage withstand N/A 2 Vn during 10 ms (for information) 
 
7.6 EMC 
Type Test Name Type Test Standard Conditions 
High Frequency 
Disturbance 
IEC 60255-22-1 (1988) 
IEC 61000-4-12 (1995) 
IEEE C37.90.1 (1989) 
Class 3: 2.5kV (CM) / 1kV (DM) 
Electrostatic discharge IEC 60255-22-2 (1996) 
IEC 61000-4-2 (1995) + 
A1 (1998) + A2 (2001) 
Class 4: 
8kV contact / 15 kV air 
Class 3: 
10 V/m – 80 to 1000 MHz 
 
& spot tests 
Radiated Immunity IEC 60255-22-3 (2000) 
IEC 61000-4-3 (2002) + 
A1 (2002) 
IEEE C37.90.2 (1987) 
35 V/m – 25 to 1000 MHz 
Fast Transient Burst IEC 60255-22-4 (2002) 
IEC 61000-4-4 (1995) + 
A1 (2001) 
IEEE C37.90.1 (1989) 
Class 4: 4kV – 2.5kHz (CM) 
Class 4: 2.5kV – 2.5kHz (DM) on DI/DO
Surge immunity IEC 61000-4-5 (1995) + 
A1 (2001) 
Class 4: 
4kV (CM) – 2kV (DM) 
High frequency 
conducted immunity 
IEC 61000-4-6 (2003) Class 3: 
10 V, 0.15 – 80 MHz 
Harmonics Immunity IEC 61000-4-7 (2002) 5% & 10% de H2 à H17 
Power Frequency 
Magnetic Field Immunity 
IEC 61000-4-8 (1993) Class 5: 
100A/m for 1mn 
1000A/m for 3s 
Pulse magnetic field 
immunity 
IEC 61000-4-9 (1993) Class 5: 
6.4 / 16 µs 
1000A/m for 3s 
Damped oscillatory 
magnetic field immunity 
IEC 61000-4-10 (1993) 
+ A1 (2001) 
Class 5: 
100 kHz & 1 MHz – 100A/m 
Power Frequency IEC 61000-4-16 (1998) CM 500 V / DM 250 V via 0.1 µF 
C264/EN TD/C40 Technical Data
 
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MiCOM C264/C264C
 
Type Test Name Type Test Standard Conditions 
Conducted emission EN 55022 (1998) + A1 
(2000) + A2 (2003) 
Gr. I, class A: from 0.15 to 30 MHz 
Radiated emission EN 55022(1998) + A1 
(2000) + A2 (2003) 
Gr. I, class A: from 30 to 1000 MHz 
 
 
Functional Description C264/EN FT/C40
 
MiCOM C264/C264C 
 
 
FUNCTIONAL DESCRIPTION 
Functional Description C264/EN FT/C40
 
MiCOM C264/C264C 
 
Page 1/138
 
TABLE OF CONTENTS 
1. SCOPE OF THE DOCUMENT 7 
1.1 Software features 7 
2. MiCOM C264/C264C MANAGEMENT 9 
2.1 Operating mode management 9 
2.1.1 Definitions 9 
2.1.2 Initialisation mode 9 
2.1.3 Operational mode 10 
2.1.4 Maintenance mode 11 
2.1.5 Test mode 11 
2.1.6 Faulty mode 12 
2.1.7 Halt mode 12 
2.2 Database management 13 
2.3 Time management 15 
2.3.1 External clock 16 
2.3.2 Clock message from a SCADA gateway 172.3.3 System master clock 17 
2.3.4 Time set by an operator 17 
2.3.5 Local clock update 18 
2.4 SNTP server 19 
2.5 Redundancy Management 20 
3. COMMUNICATIONS 22 
3.1 Telecontrol bus 22 
3.2 Legacy bus 23 
3.3 Station bus 23 
3.3.1 Exchanges 24 
3.3.2 Supported Common Data Classes 24 
3.3.3 Controls 24 
4. DIRECT PROCESS ACCESS 25 
4.1 Input check 25 
4.2 Output check 25 
4.3 Time tagging 25 
4.4 Digital input acquisition (DI) 25 
4.4.1 Acquisition 25 
4.4.2 Debouncing and filtering 26 
4.4.3 Toggling 26 
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4.5 Counters acquisition (CT) 27 
4.5.1 Single counter (SCT) 27 
4.5.2 Double counter (DCT) 27 
4.6 Digital measurement (DM) 28 
4.6.1 Acquisition without Read Inhibit signal 28 
4.6.2 Acquisition with Read Inhibit signal 29 
4.6.3 Encoding 30 
4.7 Analogue input acquisition (AI) 31 
4.7.1 Input ranges 31 
4.7.2 Acquisition cycle 31 
4.8 Digital outputs (DO) 31 
4.9 Digital Setpoints 31 
4.9.1 Encoding 32 
4.9.2 Read Inhibit 32 
5. DATA PROCESSING 33 
5.1 Binary Input processing 33 
5.1.1 Binary Input definition 33 
5.1.2 Processing of Single Point Status 34 
5.1.3 Processing of Double Point Status 36 
5.1.4 Processing of Multiple Point Status 40 
5.1.5 System Inputs 41 
5.1.6 IED inputs 42 
5.1.7 Group processing 42 
5.1.8 SBMC Mode Processing 43 
5.1.9 BI sent to automatism features 43 
5.2 Measurement Input Processing 44 
5.2.1 Open circuit management 44 
5.2.2 Scaling 44 
5.2.3 Zero value suppression 45 
5.2.4 Thresholds detection 45 
5.2.5 Manual suppression 46 
5.2.6 Substitution 46 
5.2.7 Forcing an invalid measurement 46 
5.2.8 Measurement resulting states 46 
5.2.9 Transmission 47 
5.2.10 CT/VT additional processing 48 
5.2.11 Digital Measurement Processing 52 
5.3 Tap Position Indication processing 53 
5.3.1 Acquisition from Digital Inputs 53 
5.3.2 Acquisition from Analogue Inputs 53 
5.3.3 Manual suppression 53 
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5.3.4 Substitution 53 
5.3.5 Forcing an invalid TPI 53 
5.3.6 TPI resulting states 54 
5.3.7 Transmission 54 
5.4 Accumulator Input Processing 54 
5.5 Energy counting 55 
5.6 Basic Data Manipulation 56 
5.6.1 Test Mode enhancements 56 
5.6.2 Device order running 56 
5.6.3 Controls management from PSL 56 
6. CONTROL SEQUENCES 58 
6.1 Generic description 58 
6.1.1 Generalities 58 
6.1.2 Control sequence phase management 59 
6.1.3 Direct Execution mode 62 
6.1.4 SBO once mode 63 
6.1.5 SBO many mode 66 
6.1.6 Generic selection checks 68 
6.1.7 Selection behaviour 72 
6.1.8 Generic execution checks 73 
6.1.9 Execution behaviour 73 
6.1.10 Controls time sequencing 74 
6.2 Control of non synchronised breakers 77 
6.2.1 Non synchronised circuit breakers features 77 
6.2.2 Control sequence of non-synchronised circuit breakers 77 
6.3 Control of synchronised breakers 78 
6.3.1 Circuit breakers features 78 
6.3.2 Circuit breakers with external synchrocheck 79 
6.3.3 Circuit breakers with internal synchrocheck 84 
6.4 Control of disconnectors 88 
6.4.1 Disconnectors features 88 
6.4.2 Control sequence of disconnectors 88 
6.5 Control of transformers 89 
6.5.1 Transformers features 89 
6.5.2 Control sequence of transformers 89 
6.6 Control of ancillary devices 92 
6.7 Control of Intelligent Electrical Devices (IED) 93 
6.7.1 Control to IEDs 93 
6.7.2 IED controls 93 
6.7.3 Digital setting point (SP) 93 
6.8 System controls 93 
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6.9 Kind of control sequence 94 
6.10 Control sequences checks 94 
6.10.1 Mode Management 94 
6.10.2 IED connected 94 
6.10.3 Control mode 94 
6.10.4 Uniqueness of control 95 
6.10.5 Inter-control delay 95 
6.10.6 Status of the device 95 
6.10.7 Lock device 95 
6.10.8 Running Automation 95 
6.10.9 Interlocking 95 
6.11 HV Control Sequences 95 
6.11.1 Circuit breaker 95 
6.11.2 Disconnector 95 
6.11.3 Transformer 95 
6.12 Fast Load Shedding ( FLS ) 96 
7. AUTOMATIONS 97 
7.1 Built-in Automation functions 97 
7.1.1 Synchrocheck 97 
7.1.2 Auto-Recloser (AR) 99 
7.1.3 Trip Circuit Supervision 105 
7.1.4 Automatic Voltage Regulation (AVR) 107 
7.2 Interlocking: logical equations 121 
7.2.1 Inputs 121 
7.2.2 Outputs 121 
7.2.3 Control 121 
7.2.4 Behaviour 122 
7.2.5 Limits and performance 124 
7.3 Slow automation: Programmable Logic Control (PLC) 125 
7.3.1 Inputs 126 
7.3.2 Outputs 126 
7.3.3 Control 126 
7.3.4 Behaviour 127 
7.3.5 Limits and performances 127 
7.4 Fast automation: Programmable Scheme Logic (PSL) 128 
8. USER INTERFACE 129 
 
9. RECORDS 130 
9.1 Permanent records storage 130 
9.1.1 Data storage 130 
9.1.2 Waveform Recording 130 
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9.1.3 Events 132 
9.2 Non-permanent data storage 132 
9.2.1 Alarms 132 
 
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1. SCOPE OF THE DOCUMENT 
This document is a chapter of MiCOM C264/C264C documentation binders. It is the 
functional description of this computer. The hardware description is defined in HW chapter 
and all connection diagrams in CO chapter. The technical data of the computer (capabilities, 
performances, environmental limits) are grouped in TD chapter. 
1.1 Software features 
The MiCOM C264/C264C computer belongs to the new range of modular product at 
hardware, software and functional levels. All functionalities are fully configurable following 
customer needs and requirements. MiCOM C264/C264C computers assume: 
• Direct process interface through Digital Inputs (DI), Digital Outputs (DO), Analogue 
Inputs (AI), and CT/VT boards 
• Direct operator interface 
• Embedded parameterised control of all common plant or device 
• High communication abilities to IED, Ethernet, and RTU 
• User configurable automation modules 
• Events, alarms, measurement display, printing and archiving 
• Enhanced inner management with databases handling, self-test controls and 
synchronisation means 
Computer Kernel
Embedded Automation
(basic+AR, Synchrocheck+AVR)
Configurable Automation
(Fast PSL / Sequential PLC)
Telecontrol
Interface IEC 61850
T-BUS S-BUS
RTU, SCADA PACiS system, IEC 61850 IEDs
Human
Interface
(LCD)
RTC
Printing
C0003ENb
Synchronsation
Time tagging
I/O boardsLegacy Gateway
L-Bus
IED
DI DO AI CT/VT
Archives
CT, Disturb
SOE
Alarms
 
FIGURE 1: SOFTWARE FEATURES 
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The components of the software management are: 
• Inputs/Outputs board (DI, DO, AI) 
• Analogue Inputs (AI, from CT/VT board - optional) 
• Automatic functions (Built-in, PLC, PSL) 
• Communications with Telecontrol Bus, Station Bus and Legacy Bus (see chapter 
Communication) 
• RTC (Real Time Clock), time management; synchronisation, time tagging (see Time 
management chapter) 
• Communication with peripherals such as: 
− Local Operator Interface (LCD, front panel) 
− Local Printer (local sequence of events - SOE) 
 
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2. MiCOM C264/C264C MANAGEMENT 
2.1 Operating mode management 
2.1.1 Definitions 
The terms defined below are used in this whole section 2. 
• Anomaly: an anomaly is a fault causing a downgraded behaviour of the computer. 
There are hardware and/or software anomalies: 
− Board failure 
− Loss of synchronisation 
− Loss of communication 
• Software fault: A software fault results of a major software error. In this case the 
computers enters the Faulty mode. 
• Vital hardware fault:a vital hardware fault is a fault causing a software halt. This kind 
of fault causes the computer to stop the application software. 
− CPU fault 
− Power supply fault 
− Bus fault 
− Permanent Interruption fault 
2.1.2 Initialisation mode 
After power on or manual reset the computer enters the initialisation mode and performs 
different types of checks: 
• Vital hardware tests 
Non-volatile memory test: in case of a problem the computer tries to repair this non-volatile 
memory. If a vital hardware test fails, the initialisation is stopped and the computer enters the 
Halt mode. 
• Non vital hardware tests 
Non-vital hardware tests are only performed on present boards: 
− Inputs and outputs boards: 
⇒ To determinate the number and the type of the present input and output 
boards 
⇒ To check the presence of the previously input and output boards and to be 
informed if a board is absent 
⇒ To check the good working order of the present input and output boards and 
to be informed if a board is out of order 
− Communication boards: this test is performed within the communication protocol. 
− Display (LCD, LED’s): the single test that can be done is the presence of the HMI 
board. 
− Peripheral devices (printer, external clock ..). Check of the presence of the devices 
by use of timeouts. 
If any of these non-vital hardware tests fails the computer enters the 
operational/downgraded mode depending on the type of the fault. 
• Software tests (database coherency tests) 
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These tests are performed at each restart of the computer. The checks of the database 
guarantees that the database is compatible with the hardware and the software of the 
computer and that it does not contain incoherent data of configuration. The following checks 
are performed: 
• Check of the presence of a database 
• Check of the DB/ software compatibility 
This control makes it possible to check that the software and the database are 
coherent. The computer contains in its static data a version and a revision number 
indicating which structure of database it is able to interpret. The database must have 
the same version to be accepted. 
• Check of the DB/ equipment compatibility 
This control makes it possible to check that the database is intended for the 
equipment on which it was downloaded. To check it, the type and the number of 
equipment contained in the heading of the database are compared with the type and 
the number of equipment contained in the static data of the software. 
• Check of the validity of the data of the database 
This control checks that the configured inputs and outputs are present and that the 
number of objects (bays, digital inputs …) remains within acceptable limits. 
If any of these checks fails, the computer enters the Maintenance mode. 
The initialisation of the computer does not exceed one minute. 
2.1.3 Operational mode 
This mode can be divided into two sub-modes: Normal mode and Downgraded mode. 
2.1.3.1 Normal mode 
This is the nominal operating mode of the active computer. In this mode the watchdog relay 
is activated and all the functionalities of the computer are available. Nevertheless, detection 
of an error can lead to the Downgraded mode, to the Faulty mode or to the Halt mode, 
depending on the nature and the gravity of the failure. 
From this mode a transition to the Maintenance mode can be requested by an operator from 
local HMI or upper level (maintenance request). 
From this mode a transition to the Test mode can be requested by an operator from local 
HMI or upper level (simulation request). 
In this mode, the operations that can be done on databases are the following: 
• Download a standby database 
• Swap the databases: then the computer automatically restarts 
• Modify a database 
• Display database information 
This mode is transmitted to local HMI and upper level (RCP). 
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2.1.3.2 Downgraded mode 
This mode is entered in case of an anomaly. In this mode the general working of the 
computer is not very disturbed because it involves the degradation of only few functions. The 
watchdog relay is activated. 
The downgraded mode depends on the hardware configuration of the computer. But we can 
define the different kinds of downgraded modes that can happen: 
• Operation without DO on a board 
• Operation without DI on a board 
• Operation without AI on a board 
• Operation without communication with some relays 
• Operation without communication with some station devices 
• A combination of two, or more, of these previous items 
When the cause(s) of the transition into Downgraded mode disappear(s), the computer 
returns to the Normal mode. 
2.1.4 Maintenance mode 
In Maintenance mode, communication on the station bus is operational in order to manage 
the database. This mode is displayed on local HMI (led and LCD) and on upper level. 
The watchdog relay is de-activated. 
In this mode the operator can manage the database: 
• Download a database 
• Swap the databases 
• Modify a database 
• Display database information 
From this mode a transition to the operational mode can be requested by an operator from 
local HMI or upper level (active request). 
2.1.5 Test mode 
In Test mode, the computer works normally but output relays are not activated. This mode is 
entered on operator request in order to simulate the functioning of distributed automatisms 
such as interlocking. Instead of activating the output relays, the computer sends a “test OK” 
message to the SCP if the command is valid otherwise a “test NOK” message. 
NOTE: to realise the tests, the operator has to manually create the testing 
conditions by forcing BI or Measurements on different computers. 
Once the conditions are realised, he can generate a command and 
see at the SCP level (HMI) if the result corresponds to the expected 
one. 
This mode is displayed on local HMI (led and LCD) and on upper level. 
From this mode a transition to the operational mode can be requested by an operator from 
local HMI or upper level (end of simulation). 
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2.1.6 Faulty mode 
The Faulty mode is entered when a fault, that prevents the exploitation, happens. This mode 
can be entered from any mode described above. 
This mode is also entered when a failure is detected on DO boards and if the configuration 
allows this mode on DO faults. 
The only way to leave this mode is an automatic reset or a transition to the Halt mode. Each 
time the computer enters this mode, an internal counter is incremented. As long as the value 
of this counter is lower than Max_Fault (parameter defined during the configuration step) the 
Initialisation mode is entered. The value of this counter is automatically reset when the 
lasted time since the last incrementation of the counter reaches the value 
Fault_Detection_Lasting (parameter defined during the configuration step). When the value 
of this counter reaches Max_Fault the computer enters the Halt mode. 
2.1.7 Halt mode 
In this mode the computer doesn’t operate anymore. The watchdog relay and all the outputs 
relays are deactivated. The only way to get out of this mode is to operate a manual reset. 
The following figure summarises the different operating modes of the computer and the 
transitions. 
 
FAULTY
automatic reset manual reset 
HALT 
TEST 
simulation request 
end of simulation 
major hardware fault 
or software fault 
OPERATIONAL MAINTENANCE
 
INITIALISATION 
Init OK 
hardware test OK 
and coherency not OK 
maintenance request 
active request 
boot 
software fault or
major hardwraefault 
no DBvital hardware 
fault 
 
vital hardware fault 
major hardware fault 
Counter of faults = Max_Fault 
vital hardware fault
C0307ENa
 
vital 
hardware 
fault 
DB/software compatibility not OK 
or 
DB/equipment compatibility not OK 
or 
data of database not valid 
 
swapping of the databases 
 
FIGURE 2: OPERATING MODES OF THE COMPUTER 
 
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2.2 Database management 
The MiCOM C264/C264C uses structured databases for data management. A database 
(DB) is a file which contains the description of the whole of the electric process, as of the 
whole of the equipment which the computer is likely to dialogue with (IED, HMI ,etc.). It 
contains also some parameter settings of the software and of the transmission. Databases 
are generated and versioned by an independent equipment: the System Configuration Editor 
(SCE). Each database file has an associated Vdbs (System Baseline Version) A database is 
downloaded into the non-volatile memory of the computer via the IEC61850 station bus with 
the System Management Tool (SMT) or directly over Ethernet with the Computer 
Maintenance Tool (CMT). 
The computer stores at any moment up to two DBs in its non-volatile memory. The two DBs 
(and these associated Vdbs) are called thereafter DB1 and DB2 (and these associated Vdbs1 
and Vdbs2). 
Each database (DB1 and DB2) of the computer can take one of the following states: 
• Missing: the DB is not present in non-volatile memory of the computer; 
• Standby: the DB was downloaded in non volatile memory of the computer; however, 
this version is not taken into account by the software; 
• Current: the downloaded DB is taken into account by the software; 
• Current Modified: the DB, currently taken into account by the software, underwent a 
parameter setting; 
• Standby Modified: the DB underwent a parameter setting, but it is not taken any 
more into account by the software. 
The following diagram represents the life cycle of the databases in the computer: 
C0308ENa
Standby CurrentSwitching
Standby
Modified
Parameter setting
Current
Modified
Switching
Downloading
Absent
Parameter setting
 
FIGURE 3: THE DIFFERENT STATUS OF A DATABASE 
At any moment, there is only one Current or Current Modified database. In the same way, 
there is only one Standby or Standby Modified database. 
A file descriptor (DB context) stored in non-volatile memory contains the configuration of the 
DB present on the equipment. This file, containing the state of each of the two databases 
(DB1 and DB2) and the Vdbs (Vdbs1 and Vdbs2) of each one, makes it possible to know the 
configuration of the databases at the moment of the boot, and to start again with the current 
database (if it exists). DB Context is updated by the sub-functions "Download a database", 
"Switch the databases", "Check a database", "Modify a Database". 
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• To download a database ( via Ethernet) 
The downloading of a database is usually performed with SMT tool via the station bus. 
The first downloading of a database (and its associated Vdbs) can be performed only 
when the computer is in maintenance mode. 
The downloading of a standby database (and its associated Vdbs) can be performed 
when the computer, running with the current database, is either in operational mode or 
in maintenance mode. 
The sequencing is: 
− To work out and transmit to the calling equipment a response to the request: the 
request can be refused if another request on database is already in progress; 
− To carry out the transfer of the DB file (and associated Vdbs) and to check its 
integrity (calculation of checksum and control of the database); 
− In case of fault, to announce to the calling equipment the failure of the transfer; 
− In case of successful transfer, to control the database compatibility; 
− In case of invalid DB, to announce to the calling equipment the failure of the 
installation; 
− In case of valid DB, to assign to the downloaded database (and associated Vdbs) 
the state standby by removing a possible standby database (and associated 
Vdbs) present in the computer; to signal to the calling equipment the success of 
the installation; 
− To update the file descriptor (Context database) in non-volatile memory. 
• To switch the databases 
This function answers to a request of DB switching coming from the station bus. This 
request specifies the Version of the standby DB (Vdbs) to become current. After 
a DB switch the computer automatically reboots and goes into active Mode if the DB is 
coherent with the software. 
C0309ENa
Vdbs n.m
DB1
Vdbs x.y
DB2
CURRENT STANDBY
Vdbs x.y
DB2
Vdbs n.m
DB1
CURRENT STANDBY
SWITCH
MAINTENANCE MAINTENANCE
T0 T0 + T1
Vdbs x.y
DB2
Vdbs n.m
DB1
CURRENT STAND-BY
OPERATIONAL
T0 + T1
T0 + T1
 
FIGURE 4: DATABASES SWITCHING 
• To check the database 
This function is carried out at each reboot. (refer to 3.2.1 Initialisation mode) 
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• To modify the database 
The parameter setting of database consists in modifying some values of configuration 
present in the database. A parameter setting can be carried out only on the current 
database (Current or Current Modified). Following a parameter setting, file database is 
modified: the new value taken by the data is memorised there. The index of parameter 
setting of the database is incremented, and the checksum of the file is recomputed. 
The database then takes the Current Modified state. Only certain data are settable. 
This is performed from the local HMI. 
− To carry out a parameter setting of data 
This function treats the requests of parameter setting: 
⇒ To check the coherence of the request: known object (the object is really 
present in the database), settable data, value of parameter setting compatible 
with the type of data conveyed (value belonging to the range of acceptable 
variation), 
⇒ If the request is incoherent, to emit a negative report to the emitter of the 
request, 
⇒ To write in database file the current value of the data, 
⇒ To write in database file the date of modification of the data, 
⇒ To compute the checksum and to write it in data base file, 
⇒ To assign the state Current Modified to it, 
⇒ To emit a positive report with the emitting equipment of the request, 
⇒ To update the file descriptor (Context database) in non-volatile memory. 
• To consult a settable data 
This function treats the requests of consultation of parameter issued from the Operator 
Station: 
− To check the coherence of the request: known object (the object is quite present in 
the database), settable data and current DB 
− If the request is incoherent, to emit a negative response to the transmitter of the 
request 
− To work out the response to the transmitter of the request by giving the current 
value of the data 
For C264 in standalone applications, C264 offers possibility to store locally (in flash memory) 
the database source, in the limit of 20 MB database source size. 
In this case, the upload of the source database is done with the CMT Tool (Computer 
Maintenance Tool). 
2.3 Time management 
The main purposes of the time management are: 
• Synchronisation of the computer by: 
− The external clock 
− Station/legacy bus 
− Operator 
• Updating of the internal clock 
• Synchronisation of other equipments via station bus 
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Time synchronisation of a computer can be done by four means: 
• External clock (IRIG-B signal 
• Clock message from a SCADA gateway (T-Bus)