Kramer RAS Removal. Presentation to RASRS. Edison Team Members: Bill Z. Zhang, Protection Engineering Haroun Idris, Electric System Planning

Transcription

1 Kramer RAS Removal Edison Team Members: Bill Z. Zhang, Protection Engineering Haroun Idris, Electric System Planning Presentation to RASRS November 14, 2018

2 Objective APPROVAL TO remove SCE s Kramer RAS (SOB-209) 2 Southern California Edison

3 Objective Introduction/Background Purpose and operating principles Protection design requirements 3 Southern California Edison

4 Kramer RAS The existing Kramer RAS (SOB-209) is designed to prevent thermal overload and system instability under loss of the Kramer-Inyokern- Randsburg No kv line. The appropriate generation resource is armed or disarmed based on the status of the Inyo phase shifter (PS) and the total power flow on the Kramer-Inyokern-Randsburg No. 1 & No kv lines metered at Kramer substation Line Flow (Inyo PS not In Service) Line Flow (Inyo PS In Service) Arming Requirement 150 MW 160 MW Arm Calgen or McGen (retired) 200 MW 210 MW Arm remaining generator As of December 1, 2014, ACE Cogeneration Company retired its McGen facility with a total capacity of 108 MW 4 Southern California Edison

5 Kramer RAS Map Inyokern Sub Randsburg Sub Kramer Sub 5 Southern California Edison

6 Kramer/Bishop RAS Area Diagram To Dixie Valley (NVE) Bishop Creek Units 2-4 Morgan 55 KV (LDWP) Inyo Haiwee (LDWP) Coso Control Oxbow Mt. Tom 55 KV Calgen 55 KV BISHOP RAS AREA BLM West Downs BLM East Navy 2 McGen (Retired) Inyokern Searles KRAMER RAS AREA Randsburg Mogen (Retired) Sungen LSP Borax Edwards Southbase Holgate Rocket Test Kramer 6 Southern California Edison Legend (#) 500 kv line 230 kv line 115 kv line Non-SCE owned lines (any color line) No. of lines (any color line) Phase Shifter

7 Interface Line Flow (MW) Kramer RAS Review The maximum total path flow on the Kramer-Inyokern-Randsburg No. 1 & No kv lines trended for 2016 is 107 MW, 2015 is 92 MW, and 179 MW for The downward trend from 2014 can be attributed to the generation retirement at McGen (108 MW) Inyokern-Randsburg-Kramer Path 115 kv HOURS 2014 DATA 2015 DATA 2016 Data 7 Southern California Edison

8 Kramer RAS Review (cont.) A 2017 study case was developed with maximum flows on Kramer- Inyokern-Randsburg No. 1 and No kv lines Under off peak load conditions Max. generation on-line in North of Inyokern area With and without Inyo phase shifter in-service Maximum total path flow achieved on Kramer-Inyokern-Randsburg No. 1 and No kv lines was: 115 MW with Inyo PS in-service 120 MW with Inyo PS NOT in-service Total path flow greater than 120 MW on the path is difficult to achieve with existing generation and the retirement of 108 MW at McGen facility. The Kramer RAS is not required at current generation levels and is not triggered at the maximum achievable path flow of 120 MW with the P1 contingency of the Kramer-Inyokern-Randsburg No kv line. The existing Kramer RAS describes the current procedure used to curtail and maintain Inyokern/Bishop area generation as a mitigation for a forced/scheduled outage of either Kramer-Inyokern-Randsburg No. 1 or No kv transmission lines 8 Southern California Edison

9 Conclusion Because the Kramer RAS is obsolete due to the retirement of the 108 MW McGen project and also not WECC compliant, SCE believes it should be retired. In the event future generation(s) materializes in the area and/or a reliability project reconfigures the system topology in the area which could result in increased flow on the Kramer-Inyokern-Randsburg lines, a new WECC-compliant RAS will be proposed to address potential overloads and/or dynamic instability. 9 Southern California Edison

10 Protection relays to be removed Substation No. of Relays Relay Type Designation Comments Kramer: 3 ASEA RXIL Undercurrent Relays: Monitors Inyokern 115kV Line Monitors Lugo No kV Line Monitors Lugo No kV Line 4 RFL-6745-RX 1B 5B 5C 5D Receive from: Inyokern Lugo 1AA & 2AA Lugo (Kramer No. 1 Line) Lugo (Kramer No. 1 Line) 5 RFL-6745-TX/RX 5 RFL-Logic Devices 2A 2B 4A 4B 4C 3F 3H 3J 3K 3L Transmit/Receive To: Coolwater CT31 Coolwater CT 32 Coolwater CT 41 Coolwater CT 42 McGen Test Logic Alarm Test Alarm Test Trip Matrix Arming Sw. Interface 10 Southern California Edison

11 Protection relays to be removed (cont d) Lugo: 3 ASEA RXIL Undercurrent Relays: Monitors 1AA (BDD Ckt) Monitors 1AA (T60 Ckt) Monitors 2AA (BDD Ckt) 3 ASEA RXIL Undercurrent Relays: Monitors 2AA (T60 Ckt) Monitors Kramer No kV Line Monitors Kramer No kV Line Inyokern: 3 RFL-6745-TX Transmit to Kramer: 1AA and 2AA Status Kramer No kV Line Status Kramer No kV Line Status 1 RFL Device 85T-1 Auto Test (Not in Service) 1 ASEA RXIL Undercurrent Relay: Monitors Kramer 115kV Line 1 RFL-6745-TX 85-1 Transmit to Kramer: Kramer 115kV Line Status 1 RFL-6745-RX 85-2 Receive From Kramer: Trip CalGen Signal 1 RFL Device Generator Test (Not in Service) 11 Southern California Edison

12 Protection relays to be removed (cont d) Generators: Coolwater: 4 RFL-6745-RX/TX Receive from Kramer: Trip CT-31 Trip CT-32 Trip CT-41 Trip CT-42 McGen: 1 RFL-6745-RX/TX 85 Receive from Kramer: Trip McGen CalGen No Relays Receives trip directly from Inyokern 12 Southern California Edison

13 Questions 13 Southern California Edison

14 SCE is requesting approval to Remove SCE s Kramer RAS (SOB-209) 14 Southern California Edison

15 Thank You! 15 Southern California Edison