Method and device for monitoring crossing of direct current insulated buses

Abstract

The invention discloses a method and a device for monitoring the crossing of direct current insulated buses. The method comprises the following steps of arranging two sections of independently running direct current buses on two direct current ground insulation monitoring devices respectively; performing connection according to a direct current crossing mode, inputting the balanced bridge resistance of the two direct current ground insulation monitoring devices into the other direct current ground insulation monitoring devices, and monitoring the ground resistance of each other by using the direct current ground insulation monitoring devices; arranging a group of communication cables between the two respectively running direct current ground insulation monitoring devices for data communication; receiving related measurement data acquired by acquisition modules through the communication cables by using the two direct current ground insulation monitoring devices respectively; judging whether direct current crossing corresponding to the direct current bus crossing mode occurs or not according to the measurement data. According to the method and the device, whether the direct current crossing occurs or not can be accurately monitored, an alarm about a direct current line to which the direct current crossing occurs is given, and a loop in which the two sections of direct current buses are crossed can be accurately found.

Description

technical field [0001] The invention relates to the technical field of power system insulation monitoring, and more specifically, relates to a method and a device for monitoring the mutual channeling of DC insulating busbars. Background technique [0002] In the power system, in order to ensure the safe operation of the DC power supply for the substation, two independent DC power supplies are often provided, and the two DC sections of the same substation are required to operate independently. During operation, due to wiring errors or equipment aging, two sections of busbars are usually electrically connected, that is, the phenomenon of two sections of busbars holding hands. [0003] The existing DC system is prone to electrical connection, that is, two-point grounding phenomenon. The two-point grounding phenomenon often causes certain dangers to the normal operation of relay protection in substations. Therefore, using a multimeter to monitor whether the two sections of the...

AI Technical Summary

Problems solved by technology

[0003] The existing DC system is prone to electrical connection, that is, two-point grounding phenomenon

The two-point grounding phenomenon often causes certain dangers to the normal operation of the relay protection of the substation

Therefore, if a multimeter is used to monitor whether the two sections of the busbars are connected to each other, it is impossible to accurately monitor whether the DC busbars are connected to each other, nor to give an accurate alarm, and it is impossible to accurately find the circuit where the two sections of the DC busbars are connected to each other.

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