Calculation method and device for breaking capacitive load overvoltage of filter circuit breaker

Abstract

The invention discloses a calculation method and device for breaking capacitive load overvoltage of a filter circuit breaker. and pre-established components to set parameters to construct an equivalent circuit model for calculating the filter circuit breaker breaking capacitive load overvoltage; wherein, the pre-established components in the circuit breaker module include several fracture resistances and Several fracture parallel capacitors, the parameters of each fracture resistance are configured according to the resistance value of the bulk insulation resistance of the circuit breaker arc extinguishing chamber and the resistance value of the circuit breaker ceramic sleeve surface resistance; filter through the equivalent circuit model The simulation calculation of breaking the capacitive load overvoltage of the filter circuit breaker is carried out to obtain the breaking capacitive load overvoltage of the filter circuit breaker. The invention can accurately calculate the breaking capacitive load overvoltage of the filter circuit breaker.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a calculation method and device for breaking capacitive load overvoltage of a filter circuit breaker. Background technique [0002] Due to its special application, the AC filter switching circuit breaker needs to cut off the capacitive load, the switching is frequent, and the switching needs to withstand the mixed AC and DC voltage. The working condition is harsh, and it should have higher technical requirements than ordinary circuit breakers. . In recent years, there have been a number of filter circuit breaker accidents. The basic phenomenon of the accidents is that the filter circuit breaker has been disconnected and then re-ignition or flashover occurred, and there have been many explosion accidents, which constitute a serious threat to the reliable and safe operation of the power grid. Great challenge. Whether the filter circuit breaker can be successfully disconnected...

AI Technical Summary

Problems solved by technology

However, the inventor found in the process of implementing the present invention that since the circuit breaker is composed of an arc extinguishing chamber, an outer porcelain sleeve, and parallel capacitors, these components have a certain impact on the calculation of the filter circuit breaker breaking capacitive load overvoltage. However, the existing model for calculating the overvoltage of the filter circuit breaker breaking the capacitive load does not consider the influence of these components on the overvoltage, which will make the calculation of the overvoltage of the filter circuit breaker breaking the capacitive load inaccurate

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