1. Specifications Updates and Approval
Distrelay model
Specifications Updates and Approval
Megan Cammarano | MVWG Meeting | June 15, 2016

2. Updates to WECC Model Specifications
overview
Drivers and Need
Updates to WECC Model Specifications
The Generic Distance Relay Model was approved January 23, 2014
Model Approval
Including examples of proper operation

3. Drivers and need

4. 2011 Southwest blackout event
FERC & NERC report called for improved planning
Modeling of automatic actions
Reduce assumptions made on timing of actions
Expand entities’ external visibility
More complete data sharing
WECC response agreed to model relays
TSS created the Modeling SPS and Relays Ad-Hoc Task Force (MSRATF) to develop and/or implement relay models
WECC developed DISTRELAY model specs

5. Tpl-001-4
Accurate representation of system elements
Protection will have significant impact on system performance
As stated in TPL-001-4, R4, Part analysis should include:
“Tripping of Transmission lines and transformers where transient swings cause Protection System operation based on generic or actual relay models.”

6. PRC-026
Ensuring load-responsive protective relays do not trip in response to stable power swings during non-Fault conditions
Relay models as a part of the system model allow for PRC-026 testing as a part of the annual TPL assessment
Requirement R1 criterion 4 references TPL and states relay tripping must be assessed within the annual TPL assessment

7. Updates to wecc model specifications

8. Add language
If the fault persists, both ends should reopen, following the same timeline as their initial opening.
If the input parameter RecloseWithFault is set to 0, when the fault persists, the second end to reclose will not reclose.

9. Include parameter “reclosewithfault”
Allows for line “testing”
Set parameter to 0 to enable
If the first end of the line to reclose recloses on a fault, the second end of the line will not reclose

10. Motion
Change model specifications to those outlined:
Include clarification that relays should be able to trigger breakers to reopen after reclosing if the fault persists
Add parameter “RecloseWithFault” to allow for line testing

11. Model approval

12. Seattle City light system overview
Service area population: ~800,000
~1,900 MVA system load peak
15 major substations
50 transmission lines (656 miles)
92 distance relays

13. Model examples
Using PowerWorld Version 19
Without transfer trip
Direct Underreaching Transfer Trip (DUTT)
Permissive Overreaching Transfer Trip (POTT)

14. Example W/O Transfer Trip
Contingency: Three-phase fault applied at 1 second on Shoreline to Bothell Ckt 2 at 10% of the line

15. Example W/O Transfer Trip
Bus 1 should open 6 cycles after the fault is applied (Zone 1 Protection)
Bus 2 should open 26 cycles after the fault is applied (Zone 2 Protection)
Bothell
Shoreline

16. Simulation results correct!
Example w/o transfer trip
Transient Stability Started at 5/18/2017 3:06:00 PM
Time: Event: Apply Solid Fault (3PB) Line BOTHELL TO SHORELIN CKT 2
Time: Event: Relay A Zone 1 tripped Line BOTHELL TO SHORELIN CKT 2
Time: Event: Line Relay DISTRELAYRF,Direct Trip action: Open From End Line BOTHELL TO SHORELIN CKT 2
Time: Event: Relay A Zone 2 tripped Line BOTHELL TO SHORELIN CKT 2
Time: Event: Line Relay DISTRELAYRF,Direct Trip action: Open To End (Both ends now Open) Line BOTHELL TO SHORELIN CKT 2
Transient Stability Solution Finished at 5/18/2017 3:11:01 PM

17. Simulation results
Example W/O Transfer Trip

18. Simulation Results
Example W/O Transfer Trip

19. Simulation Results
Example W/O Transfer Trip

20. Example W/ Transfer Trip (DUTT)
Contingency: Three-phase fault applied at 1 second on Bothell to Diablo Ckt 1 at 10% of the line

21. Example W/ Transfer Trip (DUTT)
Bothell should open 6 cycles after the fault is applied (Zone 1 Protection)
Diablo should open 1 cycle after that (TT communication time)
Bothell
Diablo

22. Simulation results correct!
Example w/ transfer trip (DUTT)
Transient Stability Started at 5/15/2017 1:19:29 PM
Time: Event: Apply Solid Fault (3PB) Line BOTHELL TO DIABLO CKT 1
Time: Event: Relay A Zone 1 Entered (pickup) Line BOTHELL TO DIABLO CKT 1
Time: Event: Line Relay DISTRELAYRF,Direct Trip action: Open From End Line BOTHELL TO DIABLO CKT 1
Time: Event: Line Relay DISTRELAYRF,Transfer Trip action: Open To End (Both ends now Open) Line BOTHELL TO DIABLO CKT 1
Transient Stability Solution Finished at 5/15/2017 1:24:25 PM

23. Simulation results
Example W/ Transfer Trip (DUTT)

24. Simulation results
Example W/ Transfer Trip (DUTT)

25. Simulation results
Example W/ Transfer Trip (DUTT)

26. Example W/ Transfer Trip (pott)
Contingency: Three-phase fault applied at 1 second on Delridge to Duwamish Ckt 1 at 10% of the line

27. Example W/ Transfer Trip (pott)
Delridge should open 6 cycles after the fault is applied (Zone 1 Protection)
Duwamish should open 1 cycle after that (TT communication time)
Delridge
Duwamish

28. Simulation results correct!
Example w/ transfer trip (POTT)
Transient Stability Started at 5/15/2017 2:06:46 PM
Time: Event: Apply Solid Fault (3PB) Line DELRIDGE TO DUWAMISH CKT 1
Time: Event: Relay A Zone 1 Entered (pickup) Line DELRIDGE TO DUWAMISH CKT 1
Time: Event: Line Relay DISTRELAYRF,Direct Trip action: Open From End Line DELRIDGE TO DUWAMISH CKT 1
Time: Event: Line Relay DISTRELAYRF,Transfer Trip action: Open To End (Both ends now Open) Line DELRIDGE TO DUWAMISH CKT 1
Transient Stability Solution Finished at 5/15/2017 2:11:56 PM

29. Simulation results
Example W/ Transfer Trip (POTT)

30. Simulation results
Example W/ Transfer Trip (POTT)

31. Simulation results
Example W/ Transfer Trip (POTT)

32. DISTRELAY is functioning properly for multiple contingencies
Conclusion
DISTRELAY is functioning properly for multiple contingencies
No significant increase in computation time
With 92 DISTRELAY models

33. motion
Approve DISTRELAYRF model and add to WECC Approved Dynamic Model Library
Note: Please do not use on series compensated lines until further testing is completed