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In view of frequent and severe overvoltage failures of 40.5-kV vacuum circuit breakers (CBs) while switching off the shunt reactors in the 35-kV distribution systems in China, a series of field tests was carried out to determine the mechanism of this kind of disruption. The transient process and phenomena were analyzed and summarized based on the overvoltage waveforms obtained from the field tests...
Synchronously closing can avoid surge current and overvoltage on the parallel capacitor. There will be more meaningful to 550 kV than lower voltage capacitor because the insulation requirements are relatively higher in 550 kV situations. Circuit breaker's synchronous operation and synchronously closing controller (SCC) can be a key part to the modern substation intellectualization and automation system...
Synchronous circuit breaker can close or open the circuit at some designated phase of the voltage or current to avoid serious transient overvoltage and surge current in power system. Synchronous circuit breaker can significantly improve the intelligent and automatic level of a substation. Rate of decrease dielectric strength (RDDS) and operation time stability are the first important parameters to...
This paper focuses on the current distribution and thermal effects of the sliding contact arrangement used in high voltage circuit breaker to allow the switching operation of the breaking chamber. Calculation results from ANSYS show that the currents flowing through different contacts are not equal, which may lead to overheating risk onto some contacts. Both steady and transient thermal effects analysis...
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