JCIPRNET
Method and apparatus for identifying open phase of circuit breaker on basis of voltage
A method and apparatus for identifying an open phase of a circuit breaker on the basis of voltage. The method comprises: a protection apparatus measures three-phase voltages at two sides of a circuit breaker; respectively calculates a vector difference and an effective value of the voltages at two sides of the circuit breaker; when the phase voltages at two sides are both greater than 80% to 90% of a rated voltage, and the voltage vector difference at two sides of the one-phase or two-phase circuit breaker is greater than a set voltage, it is determined that the circuit breaker has an open phase; and actuates an alarming or tripping operation after a short time delay t.
NR ENGINEERING CO., LTD NR ELECTRIC CO., LTD
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inventional inventional inventional inventional inventional additional inventional inventional inventional inventional
Jun Guang Shouping Kai Zigang Huazhong Yaoyao Qixue Jiasheng
Chen Wang Zhong Wang Guo Li Ji Zhang Chen