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Direct current system insulation on-line monitoring device

A technology of DC system and monitoring device, applied in the field of power system

Inactive Publication Date: 2014-02-19
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problems existing in the existing DC system insulation on-line monitoring technology, and to provide a DC system insulation on-line monitoring device

Method used

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  • Direct current system insulation on-line monitoring device

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Experimental program
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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination Figure 1 to Figure 7 Describe this embodiment, the DC system insulation online monitoring device described in this embodiment, such as figure 2 As shown, it includes a central processing unit 1, a bus detection unit 2, a display alarm unit 4 and m feeder leakage current acquisition units 5,

[0024] The bus detection unit 2 collects the bus voltage, and the bus voltage includes the DC bus voltage, the positive and negative bus voltage to ground and the AC mixed voltage, the bus voltage signal transmission terminal of the bus detection unit 2 and the bus voltage signal transmission terminal of the central processing unit 1 connected;

[0025] Each feeder leakage current collection unit 5 collects the ground leakage current of n feeders, and the feeder ground leakage current signal transmission terminals of the m feeder leakage current collection units 5 are connected to the feeder ground leakage current signa...

specific Embodiment approach 2

[0040]Embodiment 2: This embodiment further describes Embodiment 1. It also includes a communication unit 3 , and the central processing unit 1 communicates through the communication unit 3 .

[0041] The busbars of the DC system are arranged in sections and screens, and each section of the busbar is responsible for the power supply of different areas, and each section of the busbar must be equipped with an insulation on-line monitoring device. When the operation mode of the DC system changes, the two sections of busbars are combined into one section of busbars through the busbar coupler, and the insulation on-line monitoring devices communicate with each other to change the monitoring strategy. At the same time, each device also needs to upload the monitoring data to the host computer in the central control room, and the transmission of these data needs to be completed by the communication unit. Considering the interconnection requirements of insulation on-line monitoring dev...

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Abstract

The invention provides a direct current system insulation on-line monitoring device, belongs to the field of electric systems, and aims to solve the problems of the existing direct current system insulation on-line monitoring technology. The direct current system insulation on-line monitoring device comprises a central processing unit, a bus detection unit, an alarm display unit and m feeder leakage current acquisition units. The bus detection unit acquires bus voltages, wherein the bus voltages include voltages between direct current buses, positive and negative bus voltages to ground and alternate current interfusion voltages; a bus voltage signal transmission side of the bus detection unit is connected with a bus voltage signal transmission side of the central processing unit. All the feeder leakage current acquisition units acquire grounded leakage currents of n feeders, wherein feeder grounded leakage current signal transmission sides of the m feeder leakage current acquisition units are connected with a feeder grounded leakage current signal transmission side of the central processing unit through an RS485 bus. An alarm display signal transmission side of the central processing unit is connected with an alarm display signal transmission side of the display and alarm unit.

Description

technical field [0001] The invention relates to a DC system insulation on-line monitoring device, which belongs to the field of power systems. Background technique [0002] The DC system used in power plants, substations, and converter stations is a power supply system that ensures the normal operation of monitoring devices in the power system. The DC system mainly provides uninterrupted power supply for DC loads such as signal devices, control devices, and relay protection devices. Therefore, the safe, reliable, and efficient operation of the power system is directly subject to the working conditions of the DC system. DC grounding is a common fault in the DC system. DC grounding may cause misoperation of the load device and cause more serious accidents. Therefore, online monitoring of the fault status of the DC system is of great significance. At the same time, the complete DC system failure monitoring mechanism reduces the annual maintenance cost by 25-50%, and the power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R27/18
Inventor 于培永王立欣侯玉江蔡南阳薇景伟杨会民
Owner STATE GRID CORP OF CHINA