Transient Recovery Voltage Investigation in the Application of 15 kV Circuit Breaker Failure
نویسنده
چکیده
Circuit breakers can fail to interrupt fault current when the power system has transient recovery voltage (TRV) characteristics that exceed the rating of the circuit breaker. There were two incidents of failures of outdoor switchgear at a power plant substation. The cause of the failure for these breakers was investigated in order to determine if transient recovery voltage is a contributing factor in the failures. This paper presents the investigation of the substation power system and determines if TRV was likely the cause of the 15kV breaker malfunction. The investigation was carried out by digital simulation using PSCAD/EMTDC to analyze TRV waveforms. This paper present the detailed setting-up of the digital model of the substation based on the on-site measurement of the substation data. Based on the output, the peak values and rate of rise of the TRV waveforms can be determined. These values were compared with breaker ratings calculated by IEEE C37.011-1994. The studies indicate that breaker TRV risk exists in the substation. One of the failed breakers had the most severe TRV stress condition of all locations studied.
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