High-voltage direct-current insulation monitoring system and monitoring method

Abstract

The invention discloses a high-voltage direct current insulation monitoring system and monitoring method. The system comprises a control module, the control module is connected with a bus monitoring module and a branch monitoring module, and carries out insulation monitoring on a bus and a branch, the bus monitoring module comprises a voltage measurement unit, a calculation and analysis unit, and a monitoring bridge unit, the calculation and analysis unit is used for calculating a voltage difference, a current value and an insulation resistance value of a bus anode and a bus cathode, and judging an insulation fault according to the change conditions of the voltage difference and the insulation resistance value, the branch monitoring module is connected with a branch unit and a communication unit, and the branch monitoring module is used for monitoring the insulation condition of the branch unit and transmitting monitoring data through the communication unit. Insulation faults are preliminarily judged through the voltage measurement unit, so that bus faults and branch faults can be distinguished; insulation states are monitored through the bus monitoring module and the branch monitoring module; and switch switching is replaced with potentiometer adjustment, so that voltage-to-ground fluctuation is reduced.

Description

Technical field [0001] The present invention relates to the field of high pressure DC insulation monitoring, and more particularly to a high-voltage DC insulation monitoring system and a monitoring method. Background technique [0002] The high voltage DC power supply is a power source that is output from the exchange of electric or three-phase electrical inputs, several thousand volts or above the DC voltage output, and the output power has hundreds of watts to several kilowatts, which is generally regulated or steady. The earlier DC high voltage power supply is to convert the exchange of electric high voltage transformers by the power frequency high voltage transformer, and then rectify the DC high voltage electricity. When using high-voltage DC power, the busbar positive and negative two is floating operation, that is, the busbar positive and negative poles are not connected to the ground wire, and the equipment connected to the bus bar or on the buses can operate or even dama...

AI Technical Summary

Problems solved by technology

When the high-voltage DC power supply is used, the positive and negative poles of the busbar are floating, that is, the positive and negative poles of the busbar are not connected to the ground wire, and the equipment connected to the two poles of the busbar or the branch will affect the operation of the equipment or even be damaged due to insulation failure.

[0003] In the prior art, in the DC insulation monitoring device, the state switching of the balanced bridge and the unbalanced bridge is generally used to monitor the positive and negative poles of the busbar to the ground resistance, but the switching process is likely to cause voltage fluctuations to the ground and only the busbar can be judged. insulation condition

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