Interconnection Spain Europe

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SEL Confidential
Challenge: Tell Siemens Controller 
Total Spanish AC Transmission
Specify, Design, Build, Test
Collect and communicate interconnected 
bus configurations and real-time 
ac power flow change in <50 ms
Collect Breaker and Bus Configuration, 
Device Health Change of State (COS)
Gather and Verify Power From Four 
Substations 80 to 600 km Away
Specify, Design, Build, Test
Redundant Primary Systems With 
Mutual Awareness
Redundant Relays and DPACs 
Provide Dual Primary Information
• Relays are time-synchronized via SEL-2401 clock
• Time-aligned SEL-451 functions include power 
calculation, measurement sequence number update, 
and GOOSE publication every 7.5 ms 
• Time synchronization OK status and other statuses 
updated on change
• SEL-2440 DPACs publish status on change
GOOSE Retransmitted in Burst 
After COS Event
• Retransmissions attempt to overcome 
network darkness
• Time between retransmissions grows to 
reduce network load T0 (T0) T1 T1 T2 T0
Event
Real-World Experience: RTAC as 
GOOSE Protection Logic Processor
Bus 1
Feeder 2Feeder 1 Feeder 75 Feeder 77Feeder 76 Feeder 150... ...
Bus 2
Incomer 2Incomer 1
Confidence Based on Thorough Tests 
Subscribing to 150 COS GOOSE
Measured Times 
for GOOSE-Based 
Fast Bus / Reverse 
Blocking and 
Undervoltage 
Trip Schemes
Average 9 ms
Maximum 17 ms
Minimum 4 ms
Standard Deviation 2 ms
# > 20 ms 0
Test Cases 1,024
Specify, Design, Build, Test
SEL Axion® Was Chosen Based on 
Experience With RTAC
• All products are built from one code base
• This ensures consistency across products
• Current RTAC-derived products include...
Axion
SEL-3532 RTAC
Conversion Kit
SEL-3555
SEL-3505
SEL-3530SEL-3530-4
Axion Features Make It 
a Great System Master
• Dual primary master
• SCADA protocol 
• Digital I/O
• High-speed analog output (AO)
SEL-2411 AO in Milliseconds, 
Axion AO in Microseconds
But Wait…RTAC Family 
Offers So Much More!
• Logic process monitoring 
• Process streaming analog GOOSE 
• Dual primary data set failover 
for communications / time 
synchronization loss <8 ms
• Process only active primary
• Align power measurements based on 
sequence number
Verify Subscription of 1,066 Streaming 
Analog GOOSE Per Second
Streaming GOOSE Publications
Repetitive Event-Driven Power Calculation
Confirm Axion Processing With 
Built‐In Process Monitors
Subscribe to All, Process Only Four 
Healthy, Time-Aligned GOOSE
HVDC Controller
P(ac)
SEL-2243 SEL-2243
AO
Module
DI/DO
Module
Substation 1
SEL-451-5
SEL-451-5
Substation 2
SEL-451-5
SEL-451-5
Substation 3
SEL-451-5
SEL-451-5
Substation 4
SEL-451-5
SEL-451-5SEL-2241
Axion
Specify, Design, Build, Test
Selection 
Logic
Selection 
Logic +
+
Selection 
Logic
Selection 
Logic+
+
P(vic) P(hen)
P(ark) P(bie)
Axion
∑
HVDC Controller
P(ac)
SEL-451-5
SEL-451-5
SEL-451-5
SEL-451-5
Substation 3
SEL-451-5
SEL-451-5
Substation 4
SEL-451-5
SEL-451-5
Verify, Subscribe, Align, Aggregate, 
Double-Check Power Change, Drive AO
Substation 1
Substation 2
Switch
Switch Switch
Switch
Specify, Design, 
Build, Test
Specify, Design, Build, Test
Confirm Communications and 
Application Time
• GOOSE through 600 km fiber + margin = 4 ms
• Design appropriate GOOSE VLAN and 
WAN settings
• Worst-case WAN latency now 6 ms (would be 
much faster with SEL ICON®) + 4 ms = 10 ms
• Application = 33 + 10 = 43 ms < 50 ms
But Wait…RTAC Family 
Offers Even More!!
• Constant self-tests and source health tests
• Dual primary health monitoring via 
SEL MIRRORED BITS® communications
• Low overhead, non-Ethernet peer-to-peer 
database synchronization via serial Modbus®
• HMI
Axion Is Amazing
• Dual primary 
• Health monitoring
• Fast failover
• Streaming subscriptions
• Selective processing
• Synchronized power math
• Fast AO
• Run-time monitor
• HMI
Summary
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February 17, Site Acceptance Test
SEL ConfidentialSEL Confidential
February 18, Cables Completed
SEL ConfidentialSEL Confidential
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http://www.abc.es/economia/20150207/abci-
espana-duplicara-traves-cataluna-
201502062144.html
System Doubles Interconnection 
Capacity Between Spain and Europe