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SOUTH INTERIOR SUBSYSTEM Supersedes SOO 7T-33 Issued 13 October 2020

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SOUTH INTERIOR SUBSYSTEM Supersedes SOO 7T-33 Issued 13 October 2020 BC HYDRO T&D SYSTEM OPERATIONS SYSTEM OPERATING ORDER 7T-33 SOUTH INTERIOR SUBSYSTEM Supersedes SOO 7T-33 issued 13 October 2020 Effective Date: 09 March 2021 Expiry Year: 2025 Original signed by: APPROVED BY: Bob Cielen, Operations Planning Manager, T&D System Operations Requires same day posting on bchydro.com and on BCRC Extranet upon release. Requires same day MRS conveyance notification upon posting Denotes Revision SOO 7T-33 Effective Date: 09 March 2021 Page 2 of 32 SOUTH INTERIOR SUBSYSTEM INDEX 1.0 GENERAL .............................................................................................................................................. 5 2.0 RESPONSIBILITIES .............................................................................................................................. 6 3.0 SYSTEM VOLTAGE CONTROL ........................................................................................................... 7 3.1 Nominal Voltage .............................................................................................................................. 7 3.2 SF6 Switchgear Voltage Ratings ..................................................................................................... 7 3.3 Overvoltage Protection .................................................................................................................... 7 3.4 MCA & REV RMR for Voltage Control ............................................................................................ 7 4.0 SERIES CAPACITORS OPERATIONS ............................................................................................... 8 4.1 American Creek Series Capacitors ................................................................................................. 8 4.1.1 AMC MODS Switching ......................................................................................................... 8 4.1.2 AMC Protection .................................................................................................................... 8 4.2 Ruby Creek Series Capacitor .......................................................................................................... 9 4.2.1 RYC 5CX1 Switching ........................................................................................................... 9 4.2.2 RYC 5CX1 Protection .......................................................................................................... 9 4.3 Seymour Arm Series Capacitors ................................................................................................... 10 4.3.1 SYA Switching .................................................................................................................... 10 4.3.2 SYA Protection ................................................................................................................... 10 5.0 NLY PHASE SHIFTING TRANSFORMER ......................................................................................... 12 5.1 General .......................................................................................................................................... 12 5.2 Methods of Control ........................................................................................................................ 12 5.3 NLY PST Overload Protection ...................................................................................................... 12 5.4 Switching of the NLY PST ............................................................................................................. 12 5.5 2L293/2L112 Overload RAS ......................................................................................................... 13 5.5.1 Seasonal Settings ................................................................................................................ 13 6.0 BIG LOOP AND SMALL LOOP OPERATION ................................................................................... 15 6.1 Definitions ...................................................................................................................................... 15 6.2 Big Loop Operation and Switching ................................................................................................ 15 SOO 7T-33 Effective Date: 09 March 2021 Page 3 of 32 6.3 Small Loop Operation and Switching ............................................................................................ 16 6.3.1 Small Loop with 2L277 / 71L connected WAN to BDY ...................................................... 16 6.3.2 Small Loop with 2L277 / 71L connected WAN to NLY ...................................................... 16 7.0 EQUIPMENT RESTRICTIONS ............................................................................................................ 17 7.1 Equipment Rating .......................................................................................................................... 17 7.1.1 Selkirk 500/230 kV Transformer Ratings ........................................................................... 17 7.1.2 Selkirk 500kV or 230kV Circuit Breaker OOS .................................................................... 17 7.1.3 BDY-BELL Circuit Ratings (Refer to BPA Standing Order No. 308). .............................. 17 7.1.4 SEV SF6 Voltage Limit ...................................................................................................... 17 7.1.5 KCL T5 AND T6 RAS ........................................................................................................ 17 7.1.6 KCL Multiple Breaker Outages .......................................................................................... 17 7.2 MCA SF6 Bus and Reactor Switching ........................................................................................... 18 7.3 Operation with One MCA Unit ....................................................................................................... 18 7.4 Special Restrictions and Limitations at REV ................................................................................. 18 7.4.1 Generator Circuit Breakers ................................................................................................ 18 7.4.2 Unit Transformer Switching ................................................................................................ 18 7.4.3 Unit Transformer Cooling Capability .................................................................................. 19 7.4.4 SF6 Disconnect Switching ................................................................................................. 19 7.4.5 500 kV Circuit Isolation Requirement................................................................................. 19 7.5 MCA Point-On-Wave (POW) Restrictions for Energizing Equipment ........................................ 19 8.0 GUIDELINES FOR ENERGIZING CIRCUITS ..................................................................................... 20 8.1 Normal Energization Procedures ................................................................................................. 20 8.2 Circuit Energization - Abnormal Configurations ........................................................................... 21 8.2.1 Energizing the First Circuit from Nicola (5L81, 5L82, 5L83 or 5L87) ............................... 21 8.2.2 Energizing the First Circuit to ACK (When 5L76 AND 5L79 Are OOS) ........................... 22 8.2.3 Energizing the First Circuit to SEL (When 5L91, 5L96 and 5L98 Are OOS) ................... 22 8.2.4 Energizing the First Circuit to MCA (When 5L71 and 5L72 Are OOS) ............................ 22 8.3 Circuit Energization with Line Reactors OOS ......................................................................... 24 9.0 ENERGIZING MCA TRANSFORMERS .............................................................................................. 25 10.0 MCA OUTPUT LIMITS ........................................................................................................................ 25 10.1 CONDITIONS FOR NORMAL OPERATION ...................................................................................... 25 10.2 OUTPUT LIMITS .................................................................................................................................. 25 11.0 PROTECTION REQUIREMENTS AND SPECIAL FEATURES ......................................................... 26 11.1 Special Requirements ............................................................................................................. 26 11.1.1 NIC 500/230 KV TRANSFORMER ............................................................................................... 26 SOO 7T-33 Effective Date: 09 March 2021 Page 4 of 32 11.1.2 OPEN BREAKER KEYING ........................................................................................................... 26 11.2 Out of Step Protection (OOSP) ............................................................................................... 26 11.3 Overfrequency Protection ....................................................................................................... 26 11.4 Expanded MCA Lead Shaft Tripping ...................................................................................... 26 11.5 Expanded REV Lead Shaft Tripping ....................................................................................... 26 11.6 Removed ................................................................................................................................
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