Insulating detection device and detection method for direct-current power supply

Abstract

The invention discloses an insulating detection device for a direct-current power supply, which comprises an insulating detection circuit, an earthing abnormality detection circuit and a voltage adopting circuit, wherein the insulating detection circuit comprises a first detection branch circuit, a second detection branch circuit and a first earth wire K1; the earthing abnormality detection circuit comprises a third detection resistor R3, a fourth detection resistor R4, a third switch S3 and a second earth wire K2; and the voltage sample circuit is used for measuring voltage of two ends of the third detection resistor R3 or the fourth detection resistor R4. The invention also discloses an earthing abnormality detection method and an insulating detection method adopting the insulating detection device for the direct-current power supply. By adopting the device and method disclosed by the invention, no matter whether the signal earth of the insulating detection device for the direct-current power supply in a suspension state or a fixed potential state, the abnormal condition of the earth wire can be accurately detected; and furthermore, a unilateral branch circuit insulating detection method is provided, so that the insulating detection accuracy is improved and the polling time is shortened.

Description

technical field [0001] The invention belongs to the technical field of measurement and testing, and in particular relates to a DC power supply insulation detection device and its detection. Background technique [0002] In the DC power supply system, the main power supply network, the control signal power supply system and the branch power supply network are very large, and the common fault is a point ground fault. Under normal circumstances, one-point grounding does not affect the operation of the DC power supply system, but if the ground fault point cannot be quickly found and repaired, when another point ground fault occurs, it may cause a short circuit and other major problems. So the insulation detection of the DC power supply system is very necessary. [0003] The current working principle of the popular DC power insulation tester on the market is: to detect the insulation resistance of the positive and negative poles of the DC bus and each branch to the ground, and s...

AI Technical Summary

Problems solved by technology

DC power supply systems generally have many branches and there are factors such as switching delays. The common branch insulation resistance detection method requires two ground resistance switches for each branch, resulting in a round trip of the power supply system. longer time

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