Detecting device of insulation resistor of direct current system

Abstract

The invention provides a detecting device of an insulation resistor of a direct current system. According to the detecting device, one end of a switching module is connected with the negative electrode of a direct current bus of the direct current system, and the other end of the switching module is connected to the ground; a first collecting module is used for collecting a first voltage between the negative electrode of the direct current bus and the positive electrode of the direct current bus in the direct current system; a second collecting module is used for collecting a second voltage of the negative electrode of the direct current bus relative to the ground when the switching module is closed and for collecting a third voltage of the negative electrode of the direct current bus relative to the ground when the switching module is opened; a controller module is connected with the switching module, the first collecting module and the second collecting module; the controller module is used for controlling the switching module and calculating first insulation resistance of the positive electrode of the direct current bus relative to the ground and second insulation resistance of the negative electrode of the direct current bus relative to the ground respectively according to the first voltage, the second voltage and the third voltage. By the adoption of the detecting device, the insulation resistance value of the direct current system relative to the ground can be detected accurately.

Description

technical field [0001] The invention relates to the technical field of power system detection, in particular to a DC system insulation resistance detection device. Background technique [0002] As we all know, the DC power supply device must not short-circuit the positive and negative terminals of the power supply or short-circuit any one of the positive and negative terminals to the ground during operation. If one end of the power supply is short-circuited to the ground and is not dealt with in time, when the other end of the power supply is also short-circuited to the ground, the positive and negative terminals of the DC power supply will be directly short-circuited, which will easily cause accidents and pose a safety hazard. Therefore, insulation monitoring must be carried out before the DC power supply unit is powered. At present, most of the insulation detection methods used in the power system are to detect the insulation resistance of the system through the balanced ...

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Problems solved by technology

However, when the insulation of the positive and negative poles of the DC system is equally reduced, the ground voltage at both ends of the positive and negative poles remains unchanged. Using the above detection method for detection, the insulation resistance cannot be judged. Even if the insulation monitoring issues an alarm, the system cannot be directly obtained. The size of the insulation resistance to ground

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