WECC Short Circuit Analysis Update: Short Circuit Modeling Work Group 1/23/2018 Kent Bolton, Zach Garrard, Tyson Niemann Western Electricity Coordinating Council

Western Electricity Coordinating Council Overview Spreadsheet examples Discussion Items Settings used in SC programs X/R ratios Pre-fault voltage profile Generator impedance (Subtransient, Transient, Synchronous) Loads, line charging, shunts, sequence data, mutual coupling Current limited generation MOV protected series capacitors OOS lines Short circuit program conversion observations Preferred data formats, conversion options, pitfalls Fault types Line faults, line-to-line, <230 kV Western Electricity Coordinating Council

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Western Electricity Coordinating Council Comments Kent Bolton (Lead) kent@wecc.biz Tyson Niemann tniemann@wecc.biz Zachary Garrard zgarrard@wecc.biz Western Electricity Coordinating Council