1. Sub-Synchronous Ferroresonance Causes Catastrophic Failure of a Line Shunt Reactor – A Post Mortem Investigation
- Author
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D. Sydor, Steve Merriman, Zhixian Tony Jiao, Ska-Hiish Manuel, Mukesh Nagpal, and T. G. Martinich
- Subjects
Nuclear engineering ,Energy Engineering and Power Technology ,Fault (power engineering) ,Inrush current ,Line (electrical engineering) ,law.invention ,law ,Catastrophic failure ,Tripping ,Environmental science ,Electrical and Electronic Engineering ,Transformer ,Circuit breaker ,Shunt (electrical) - Abstract
On March 31, 2019, a 500 kV air-core, shunt reactor at a large generating station in BC Hydro was damaged shortly after four unit transformers were simultaneously energized from a 500 kV series and shunt compensated line source. Forensic investigations revealed that the controlled switching system, controlling the instant at which each breaker phase closes during energization to minimize inrush current, had failed. Uncontrolled closing led to under-damped, high-magnitude and sub-synchronous currents. Protection tripped and isolated the four transformers, followed shortly by shunt reactor protection tripping. Before the reactor could be isolated by circuit breakers, a damaging internal fault developed. This paper presents forensic investigation describing sequence of events leading up to reactor damage and shares the lessons learned with the peer utilities having similar installations. more...
- Published
- 2022
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