Observations using cmpldw

WECC MVWG Meeting

June 2015

Eric Bakie

2

Agenda

• Observations using cmpldw in seasonal studies

• Review of fault event data as compared to simulation data using motorw and cmpldw load representation

3

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

4

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

5

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

8

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

10

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

13

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 ebakie@idahopower.com