Detection method of self-healing breakdown of capacitor

Abstract

The invention discloses a detection method of self-healing breakdown of a capacitor. The method comprises the following steps of: (1) connecting a detection capacitor with a detection inductor in series, connecting the detection capacitor and the detection inductor in parallel with a detected sample capacitor to form a detection circuit, and connecting alternating current adjustable power supplies at two ends of the circuit; and (2) adjusting the alternating current adjustable power supplies; when the condition that the detection inductor generates a damped oscillation signal, judging that the detected sample capacitor generates the self-healing breakdown. The detection method disclosed by the invention solves the disadvantage of the conventional detection method of the self-healing breakdown by using the capacitor and has the advantages of convenience for use and accurate detection; and the detection method for a self-healing breakdown test of the capacitor is simple and reliable, has good anti-interference performance and ensures that erroneous judgment does not happen.

Description

technical field [0001] The invention relates to a capacitor detection method, in particular to a detection method for capacitor self-healing breakdown. Background technique [0002] Capacitor self-healing breakdown is that during the use and test of the capacitor, under the action of the applied voltage, due to the presence of impurities or air gaps and overvoltage in the capacitor medium, the dielectric breakdown of the capacitor forms a conduction circuit, and the breakdown point The current at the point rises suddenly, destroying the conductive path, forming an insulating area at the dielectric breakdown point, the function of the capacitor returns to normal, and the self-healing process of the capacitor ends. [0003] Existing detection methods for self-healing breakdown of capacitors usually use oscilloscope method or acoustic method. (1) Oscilloscope method: When the self-healing breakdown of the capacitor occurs, the capacitor breaks down instantaneously. In theory, ...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a detection method for self-healing breakdown of capacitors, which solves the problem that the duration of self-healing breakdown of capacitors in the currently used oscilloscope method and acoustic method is relatively short. It also solves the problem that the self-healing breakdown of the capacitor cannot be accurately detected due to the influence of the test environment and the non-self-healing breakdown sound of the capacitor itself.

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