Research on the temperature-rise test of large capacity generator circuit breaker

Summary

The protection effect of the large-capacity generator circuit (GCB) on the generator set has been widely recognized in China. At present, with the rapid development of the power industry, the capacity level of the generator circuit breaker is increasing, so the research on its manufacturing fully represents the level of power equipment manufacturers R & D and ability. According to IEC / IEEE 62271-37-013-2015 “High-voltage switchgear and controlgear. Alternating-current generator circuit-breakers”.This paper mainly describes the implementation of the temperature rise test, because the large capacity generator circuit breaker usually run in the condition of external forced cooling state, considering the test current is large, the test circuit was simulated and studied many times, the test site is arrangement reasonable ,which take into account the use of cooling equipment, at the same time in order to trace the data measured, all data acquisition systems are calibrated and verified in detail. In the implementation of the temperature rise test process, fully studies the use of the generator circuit breaker operating conditions, through the following two ways to gradually carry on the temperature rise test, First, implement the maximum rating current temperature rise test in the case of forced air cooling state, the air volume and wind temperature of the forced air cooling are controllable, then simulate the cooling equipment sudden failure, and continue to carry out this temperature rise test with the gradually reduced current in the case of cooling loss, finally obtained the maximum test current value ,which meet the temperature rise limit in the state of Cooling missing. Secondly carried out the temperature rise test with appropriate current based on the test equipment in the initial non-cooled state, obtain flow time of meet the temperature rise test limit. Through experiment, analyze and solve the problems existing in the testing process, and the corresponding relationship between the air volume and the temperature rise and the current value is studied, finally, the data obtained from the experiment are analyzed, and the possible sources of errors in the process of data acquisition are studied, and carried on the analysis of uncertainty. The development of the temperature-rise test provide a certain reference for the relevant manufacturers and users and give a useful guidance for the implementation of large current temperature-rise test.

Additional informations

Authors

FERRAZ, DE QUEIROZ, Stifter, BASTOS, OYAMA

Keywords

generator circuit- breaker;temperature-rise;air –cooled;loss of cooling;uncertainty