High voltage direct current power source insulation monitoring device

Abstract

The invention provides an insulation monitoring device which is used for monitoring ground insulation conditions of high voltage direct current power source direct current output voltage, judging insulation conditions through insulation resistance of monitoring bus-bar to the ground, and uploading values of the insulation resistance to an upper computer. The insulation monitoring device comprises a first additional delivering resistor R1, a second additional delivering resistor R2, a first delivering switch K1 and a second delivering switch K2. The R1 is in series connection with the K1. One end of the R1 is connected to a positive bus-bar. The other end of the R1 is connected to the ground. The R2 is in series connection with the K2. One end of the R2 is connected to a negative bus-bar. The other end of the R2 is connected to the ground. Equivalent ground insulation resistance of the positive bus-bar is R+. Equivalent ground insulation resistance of the negative bus-bar is R-. The R+ and the R- are obtained in a detected mode through an unbalanced bridge method. Due to adoption of the unbalanced bridge method, conditions of any insulation such as ground insulation of a bus-bar monopole, bus-bar twin poles, a monopole of the same branch, twin poles of the same branch, monopoles of different branches and twin poles of the different branches can be monitored, and any insulation condition can not be omitted. Due to build of a branch monitoring equation, insulation conditions can be timely and accurately monitored.

Description

technical field [0001] The invention belongs to the field of electronic circuits, and more specifically, the invention relates to an insulation monitoring device. Background technique [0002] In power plants and substations, the high-voltage DC system is used as a backup secondary power source, which is a very important power supply system. The DC system adopts the "ground insulation" operation mode. However, once the insulation characteristics of the HVDC system are degraded, it will lead to accidents such as electric shock and equipment damage, and in severe cases, it will cause heavy loss of life and property. Therefore, it is necessary to regularly detect and effectively monitor the insulation status of the HVDC system to improve The safety and reliability of the high-voltage DC system can eliminate potential safety hazards. [0003] At present, the monitoring of the ground insulation of the DC output voltage of the high-voltage DC power supply mainly adopts the balanc...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a device for monitoring the ground insulation of the DC output voltage of a high-voltage DC power supply, which can solve the problems of detection errors and poor real-time performance in the prior art, and can timely and accurately monitor the ground insulation of the output voltage Insulation state, so as not to cause accidents such as electric shock and equipment damage

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