Capacitor capacity anomaly detection method

Abstract

According to the capacitor capacity anomaly detection method provided by the invention, under the condition that the power electronic capacitor cannot be disassembled, a failure discrimination means for analyzing capacity characteristics is adopted, so that whether the capacity of the capacitor is excessively attenuated or not is accurately detected and judged; therefore, on the premise of low cost, the purpose of eliminating reliable test in the capacitor service cycle is achieved, and the problems of tedious disassembly of circuit elements and labor and time waste of field operation are avoided. The method comprises the following steps: 1) mathematical modeling; 2) design analysis; 3) background acquisition; and 4) testing and comparing, judging whether the capacitor capacity is within anormal use range or not according to a comparison result, and analyzing whether the capacitor capacity has abnormal attenuation or not by taking magnetic field data as a material.

Description

technical field [0001] The invention relates to a method for detecting whether there is excessive attenuation of capacitor capacity in an electrical circuit with power electronic capacitors as the main capacity, and belongs to the technical field of electrical design. Background technique [0002] The design and actual life of power electronic capacitors is long, usually up to 20 years or more. However, during its service life, considering safety and reliability issues, it is still necessary to check the state of the capacitor such as its capacity. Among them, capacity decay is the most important failure mode of capacitors at present, and it is also the most important content of state inspection. [0003] For example, the power electronic capacitors used in various electrical systems on existing high-speed rail vehicles all have the characteristics of large volume and large capacity, and are limited by the installation and use of the car body structure. Such circuits contai...

AI Technical Summary

Problems solved by technology

[0008] The abnormal detection method of capacitor capacity described in this application aims to solve the problems existing in the above-mentioned prior art, and proposes that under the condition that the power electronic capacitor cannot be disassembled, a failure screening method for analyzing capacity characteristics is adopted to realize accurate detection and judgment of the capacitor Whether the capacity is excessively attenuated or not, so as to achieve the reliable test goal of eliminating the capacitor's service life at a lower cost, and avoid the problems of cumbersome disassembly of circuit components and laborious and time-consuming on-site operations

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