Working principle and testing technology of circuit breaker closing resistor for 1100kV GIS

Abstract

The closing resistor can suppress the operation overvoltage and release the energy caused by the overvoltage generated by the power system when switching the line. It is widely used in the ultra-high voltage system AC system. Due to the complicated structure of the circuit breaker with the closing resistor, and the closing resistance of the field is placed in the sealed casing or GIS arc extinguishing chamber, regardless of whether the circuit breaker is in the closing or opening state, the closing resistance is usually not connected. The circuit breaker of GIS is more complicated than the open circuit breaker, especially the circuit breaker structure of 1100kV GIS which is the most complicated, and the maximum resistance of the closing resistor and the closing time of the closing resistor are tested. To understand this, it is very important to understand the working principle and testing technology of the ultra-high voltage circuit breaker. How to carry out preventive tests at the substation site and obtain the technical parameters of the closing resistor has become a key technical problem to be solved urgently. This paper expounds the structure of the ultra-high voltage circuit breaker, analyses the working mechanism of the closing resistor, and gives the method of on-site pre-test, combined with the Yucheng UHV ZF27-1100 (L) GIS circuit breaker to explain and give a case of on-site testing of the pre-input time of the closing resistor was made.