Novel parallel capacitor for restraining switching surge of vacuum circuit breaker

Abstract

The invention discloses a novel parallel capacitor for restraining a switching surge of a vacuum circuit breaker. The novel parallel capacitor for restraining the switching surge of the vacuum circuit breaker comprises a core, steeping liquor, a capacitance box shell and wire outlet sleeves, wherein the core is installed in the capacitance box shell, internal gaps of the core, a gap between the core and the capacitance box shell, and the interiors of the wire outlet sleeves are filled with the steeping liquor, the wire outlet sleeves are installed at the top end of the capacitance box shell, binding posts which are used for being connected with a high-voltage line are arranged on the tops of the wire outlet sleeves, and the core comprises a plurality of capacity cells which are connected in a serial-parallel mode, an insulating part and a core outgoing line. According to the novel parallel capacitor for restraining the switching surge of the vacuum circuit breaker, the capacitance value can be within the required range from 0.1 microfarad to 0.3 microfarad, the structure is simple, installation is convenient, and the required field is small. The novel parallel capacitor for restraining the switching surge of the vacuum circuit breaker is applicable to the situation that a finished project needs additional installation of capacitors, low in manufacturing cost, obvious in effect of reducing the amplitude value and the frequency of overvoltage, safe, reliable and long in service life, and has good application prospect.

Description

technical field [0001] The invention relates to a novel shunt capacitor for suppressing the operation overvoltage of a vacuum circuit breaker, which belongs to the technical field of high-voltage power transmission and transformation. Background technique [0002] With the application of 110kV and 220kV long cables in the urban power grid, it is necessary to use shunt reactors for compensation on the low-voltage side of the main transformer (10kV, 20kV and 35kV). At present, 10kV and 20kV shunt reactors are switched by vacuum circuit breakers, 35kV usually uses SF6 circuit breakers, and a small amount of vacuum circuit breakers are used. When switching reactors, vacuum circuit breakers are prone to blockage and multiple re-ignitions. High operating overvoltage often exceeds the insulation level of power equipment and causes damage, which poses a serious threat to the safe and stable operation of power equipment and power grid systems. [0003] In recent years, there have be...

AI Technical Summary

Problems solved by technology

[0009] The conventional measure to limit the operating overvoltage of vacuum circuit breakers is to install lightning arresters on the reactor side and the busbar side. Prevent failures from happening

According to the principle of cut-off overvoltage and reignition overvoltage, installing capacitors with appropriate parameters in the shunt reactor circuit can effectively suppress overvoltage and reduce the amplitude and frequency of overvoltage, while the existing structure and capacitance of capacitors do not satisfy requirements, cannot be applied directly

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