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Observations using cmpldw
WECC MVWG Meeting
June 2015
Eric Bakie
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Agenda
• Observations using cmpldw in seasonal studies
• Review of fault event data as compared to simulation data using motorw and cmpldw load representation
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Observations
• Idaho Power is observing significant load tripping in seasonal studies that include cmpldw representation
– 2015 Light Summer 50 MW (3-PH Fault at MPSN)
13 MW (SLG Fault at MPSN)
– 2015 Heavy Summer 286 MW (3-PH Faults at HMWY)
13 MW (SLG Faults at HMWY)
– 2015 Heavy Summer 195 MW (3-PH Faults at OBPR)
146 MW (3-PH Faults at ONTO)
3 MW (SLG Faults at OBPR)
• cmpldw motor trip pickup level and time delay model parameters appear to be very sensitive and may be too conservative
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Event #1
ABC Fault - Trip
Hemingway-Summer Lake 500kV (Trip)Midpoint-Hemingway 500kV (Trip)
Fault Location 110mi from Hemingway 500kV toward Burns 500kV on
Hemingway - Summer Lake 500kV Line
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3-Phase Fault – Trip 110mi from Hemingway 500kV toward Burns 500kV(HMWY-SMLK 500kV)
3PO
M4P
-2500
0
2500
-250
0
250
0
1000
2000
3000
0.0 2.5 5.0 7.5 10.0 12.5 15.0
IA(A
) IB
(A)
IC(A
)V
A(
kV
) V
B(
kV
) V
C(
kV
)I1
Ma
gD
igit
als
Cycles
IA(A) IB(A) IC(A) VA(kV) VB(kV) VC(kV) I1Mag
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Hemingway 500kV BusPhase and Sequence Voltages
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Event #1 Area Load and ID-NW Flow
Fault LocationPld shed cmpldw
110mi from Hemingway 500kV 15.6 MW
• Event #1 PI data does not clearly indicate 15MW of load was tripped
• Fault is fairly remote from load
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Voltage Recovery at HMWY
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Event #2
Close – ABC Fault - Trip
Ontario – Caldwell 230 kV (C-T)
Fault Location 9.83mi from Ontario 230kV toward Caldwell 230 on
Ontario – Caldwell 230kV Line
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Close-into 3-PH Fault-Trip9.83 mi from Ontario 230kV(ONTO-CDWL 230kV Line)
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Area Load Change (Event #2)
Fault Location Pld shed cmpldw
9.8 mi from Ontario 230kV onOntario – Caldwell 230kV Line 25.0 MW
• Event #2 PI data does not clearly indicate load was tripped
• Fault is close to load
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Voltage Recovery at ONTO 230kV Buscmpldw with tripping enabled
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Voltage Recovery at ONTO 230kV Buscmpldw with tripping blocked
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Conclusions
• Event #1 is too remote from load to make an accurate determination if load loss occurred
• Event #2 does not provide clear indication that load was tripped during fault
• cmpldw motor trip pickup level and time delay are likely too sensitive
• blocking tripping of cmpldw using 15hs4 records provided best match
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Questions
Eric Bakie, P.E.SYSTEM PLANNING ENGINEERIdaho Power | System Planning (208) 388-5677 [email protected]