Open phase conditions on the primary winding of nuclear generating station auxiliary transformers can cause issues with plant operations. Protection schemes, typically set for faults and overcurrent operation, may not detect primary open phase conditions until heavy loads are energized by the transformer. Detection at this point will usually result in tripping of load due to phase imbalance, and as a direct consequence, unintended plant operation, which can adversely affect safety related systems.
This work studies the effects of open phase conditions on the primary winding of the station transformer. Various loading scenarios are analyzed including low and high impedance open phase conditions. A Unified Magnetic Equivalent Circuit model of the transformer built through the simulation software PSCAD/EMTDC (Power Systems Computer Aided Design / Electromagnetic Transient including Direct Current) is utilized to perform the simulations. Detection and mitigation strategies are also discussed based on the most effective quantities determined from the simulation results for this type of scenario
|Commitee:||Castaneda, Juan, Nazari, Masoud|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/04M(E), Masters Abstracts International|
|Keywords:||High impedance, Open phase, Transformers|
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