Insulation detecting method and insulation detecting device

Abstract

The embodiment of the invention discloses an insulation detecting method and an insulation detecting device, which are used for detecting insulation resistance of direct-current electric equipment. The insulation detecting method provided by the embodiment comprises the following steps of: setting an insulation detecting circuit, wherein the insulation detecting circuit comprises at least two branches, and at least two branches receive corresponding direct-current inputs; when each branch is in a disconnected state, judging whether the voltage of the direct-current input of one branch is greater than a preset value; if so, acquiring the voltage of the corresponding branch of which the direct-current input voltage is greater than the preset value to serve as a sampling voltage; and calculating the insulation resistance of the direct-current input in the corresponding branch according to the sampling voltage. Through the scheme, the operation of the detection of the insulation resistance of the direct-current electric equipment is simple, and the detection efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an insulation detection method and an insulation detection device. Background technique [0002] The electrical equipment used in the field of power electronics includes a large number of DC input electrical equipment. During the use of DC input electrical equipment, the insulation performance often changes due to the influence of external factors. When the insulation performance is low, DC grounding may occur, which will lead to malfunction of the signal or control circuit in the DC input electrical equipment, and then Therefore, strict insulation testing must be carried out on DC input electrical equipment to ensure its insulation performance. Among them, the ground insulation resistance of DC input electrical equipment is an important parameter to measure the insulation performance of DC input electrical equipment, and is often used as the basis for research on leak...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned insulation detection method is complicated to operate, and its effectiveness largely depends on the size of the injected AC signal. When the signal is too large, it may damage the DC power equipment. When the signal is too small, accurate insulation cannot be performed. Detection of resistance

Therefore, when using this method for insulation detection, not only the operation is complicated, but also the efficiency is low

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