09 Motor Starting Study Exercise ETAP

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Motor Starting Study Exercise 
1. Exercise 1: System Setup – additional data for MS based on SC study files
• Source and Branch Parameters
Same as load flow and short-circuit studies.
• Switching Motor Data for Static MS
Element Accel T 
No Load
Accel T 
Full Load
St 
 Load*
Final 
 Load
T 
Begin
T 
 Final
Mtr 1 2 4 100 100 0 0
Mtr 2 1 2 100 100 0 0
Syn 1 2 4 25 90 1 5
* Set starting category data for Category 1, 2, and 3.
* Check data for Mtr4 and Mtr5.
• Switching Motor Data for Dynamic Acceleration MS
Element Mtr Model * Load Model H
Mtr 1 Single 2, HV-HS-LT, MV500HP2P FAN 0.4
Mtr 2 Charac., LV-HS-HT, LV200HP2P a k**3 0.2
Syn 1 Single 2, HV-HS-HT, MV1000HP2P Recip. Comp .5
* In Motor Parameter Update Dialog, uncheck all boxes.
• Starting Category
Element Mtr Model 
Normal Mtr 1, Mtr 4
Back Up Mtr 2, Mtr 3
ETAP Workshop Notes 5.0 Page 1 of 5
Motor Starting Study Exercise 
2. Exercise 2: Motor Starting Case 1
• Set up Study Case: MSCase-1
• Using Design Load, No load diversity factor.
• Run simulation for 15 Seconds.
• Include XFMR LTC in Pre-starting Load Flow, not during simulation.
• Acceleration motor model based on Mechanical Load. 
• Use default settings on Adjustment and Alert Pages. Check all alert options with minimum violation 
span = 0.2 second.
• Use Normal configuration.
• Action sequence:
Study Case: MSCase-1
Time Parameter Setting
0.2 second Start Mtr 5, at 60% load and ramp load from 60% to 100 % in 3 seconds.
 Switch on static load Load 2, Loading Category: Design
3 second Start all motors in the system belong to Normal Category
• Run Static Motor Starting
• Check results from OLV display, plot and report.
• Is system voltage ok? Is the problem real or is it related to user entered acceleration time and 
sequencing?
• Run Dynamic Motor Starting
• Check results from OLV display, plot and report.
• Is system voltage ok? 
• Can all the motors be started?
• Solution to solve problem with motors failing to start (to increase acceleration torque):
• Change starting sequence
• Change pre-starting voltage
• Use XFMR LTC
• Use Starting device – What type of starter should be used here? (Cap)
• Use larger motor
• Try to change Mtr4 Starting Load from 60% to 40% -- Can Mtr 4 be started?
• Check for low voltage problem – Is there a voltage problem? How to solve it?
ETAP Workshop Notes 5.0 Page 2 of 5
Motor Starting Study Exercise 
3. Exercise 3: Starting Devices
• Run Dynamic Motor Starting
• Configuration: Tie-Open, Study Case: MSCase-1 ( Change simulation duration to 15 seconds)
• Check bus voltage for starting motors. (Mtr1 V = 5000 kVA
3 second Switch to Winter Load Category
 Exclude MV loads >= 1200 kVA
Exclude MV loads >= 1000 kVA
• Run Dynamic Motor Starting with MSCase-4
• Check results from OLV display, plot and report.
• Check bus load change.
• Check if any motors are started or stopped.
ETAP Workshop Notes 5.0 Page 5 of 5
	Element
	Accel T
	No Load
	Accel T
	Full Load
	St
	Load*
	Final
	Load
	T
	Begin
	T
	Final
	Mtr 1
	2
	4
	100
	100
	0
	0
	Mtr 2
	1
	2
	100
	100
	0
	0
	Syn 1
	2
	4
	25
	90
	1
	5
	Element
	Mtr Model *
	Load Model
	H
	Mtr 1
	Single 2, HV-HS-LT, MV500HP2P
	FAN
	0.4
	Mtr 2
	Charac., LV-HS-HT, LV200HP2P
	a k**3
	0.2
	Syn 1
	Single 2, HV-HS-HT, MV1000HP2P
	Recip. Comp
	.5
	Element
	Mtr Model
	Normal
	Mtr 1, Mtr 4
	Back Up
	Mtr 2, Mtr 3
	Study Case: MSCase-1
	Time
	Parameter Setting
	0.2 second
	Start Mtr 5, at 60% load and ramp load from 60% to 100 % in 3 seconds.
	Switch on static load Load 2, Loading Category: Design
	3 second
	Start all motors in the system belong to Normal Category
	Starting Device
	Current Control
	Capacitor at Bus/Terminal
	Speed
	Setting
	Type
	Speed
	Setting
	Type
	0
	400%
	Fixed
	0
	1000 kvar
	Fixed
	2
	400%
	Fixed
	95
	Remove
	2
	200 or 250%
	Ramp
	95
	400%
	Fixed
	95
	Remove
	Study Case: MSCase-2
	Time
	Parameter Setting
	0.2 second
	Start all motors in the system belongs to Backup Category
	Switch on static load Load 1, Design category
	3 second
	Start OpenMOV and ClosedMOV
	Study Case: MSCase-3
	Time
	Parameter Setting
	0.2 second
	Switch on static load Load 1, Design category
	3 second
	Start OpenMOV and ClosedMOV
	5 second
	Start all motors in the system belonging to Backup Category
	Study Case: MSCase-4
	Time
	Parameter Setting
	0.2 second
	Switch to Normal Load Category
	Exclude MV loads >= 5000 kVA
	3 second
	Switch to Winter Load Category
	Exclude MV loads >= 1200 kVA
	Exclude MV loads >= 1000 kVA