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

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

Drivers and need

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

Tpl-001-4 Accurate representation of system elements Protection will have significant impact on system performance As stated in TPL-001-4, R4, Part 4.3.1.3 analysis should include: “Tripping of Transmission lines and transformers where transient swings cause Protection System operation based on generic or actual relay models.”

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-001-4 and states relay tripping must be assessed within the annual TPL assessment

Updates to wecc model specifications

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.

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

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

Model approval

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

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

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

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

Simulation results correct! Example w/o transfer trip Transient Stability Started at 5/18/2017 3:06:00 PM Time: 1.000 Event: Apply Solid Fault (3PB) Line BOTHELL TO SHORELIN CKT 2 Time: 1.000 Event: Relay A Zone 1 tripped Line BOTHELL TO SHORELIN CKT 2 Time: 1.100 Event: Line Relay DISTRELAYRF,Direct Trip action: Open From End Line BOTHELL TO SHORELIN CKT 2 Time: 1.333 Event: Relay A Zone 2 tripped Line BOTHELL TO SHORELIN CKT 2 Time: 1.433 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

Simulation results Example W/O Transfer Trip

Simulation Results Example W/O Transfer Trip

Simulation Results Example W/O Transfer Trip

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

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

Simulation results correct! Example w/ transfer trip (DUTT) Transient Stability Started at 5/15/2017 1:19:29 PM Time: 1.000 Event: Apply Solid Fault (3PB) Line BOTHELL TO DIABLO CKT 1 Time: 1.000 Event: Relay A Zone 1 Entered (pickup) Line BOTHELL TO DIABLO CKT 1 Time: 1.100 Event: Line Relay DISTRELAYRF,Direct Trip action: Open From End Line BOTHELL TO DIABLO CKT 1 Time: 1.117 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

Simulation results Example W/ Transfer Trip (DUTT)

Simulation results Example W/ Transfer Trip (DUTT)

Simulation results Example W/ Transfer Trip (DUTT)

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

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

Simulation results correct! Example w/ transfer trip (POTT) Transient Stability Started at 5/15/2017 2:06:46 PM Time: 1.000 Event: Apply Solid Fault (3PB) Line DELRIDGE TO DUWAMISH CKT 1 Time: 1.000 Event: Relay A Zone 1 Entered (pickup) Line DELRIDGE TO DUWAMISH CKT 1 Time: 1.100 Event: Line Relay DISTRELAYRF,Direct Trip action: Open From End Line DELRIDGE TO DUWAMISH CKT 1 Time: 1.117 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

Simulation results Example W/ Transfer Trip (POTT)

Simulation results Example W/ Transfer Trip (POTT)

Simulation results Example W/ Transfer Trip (POTT)

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

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