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Device and method for detecting fault of direct current looped network of direct current power supply system

A technology of detection device and power supply system, applied in the direction of measurement device, measurement of electricity, measurement of electric variables, etc., can solve the problem of no ring network detection device, etc.

Active Publication Date: 2012-07-18
BEIJING PEOPLES ELECTRIC PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no ring network detection device using other methods or a DC insulation monitoring device with ring network detection

Method used

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  • Device and method for detecting fault of direct current looped network of direct current power supply system
  • Device and method for detecting fault of direct current looped network of direct current power supply system
  • Device and method for detecting fault of direct current looped network of direct current power supply system

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.

[0046] figure 1 It is a functional block diagram of the device of the present invention. Such as figure 1 As shown: the first balance bridge unit is connected between the positive pole of the first group of DC bus bars and the negative pole of the first group of DC bus bars, and is connected to one end of the first grounding control unit, and the other end of the first grounding control unit is connected to the earth; The second balance bridge unit is connected between the positive poles of the second group of DC busbars and the negative poles of the second group of DC busbars, and is connected to one end of the second grounding control unit, and the other end of the second grounding control unit is connected to the ground. The first voltage acquisition unit is connecte...

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PUM

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Abstract

The invention provides a device for detecting fault of a direct current looped network of a direct current power supply system and a detection method for detecting fault of the direct current looped network of the direct current power supply system. The detection device comprises two balanced bridge units, two voltage collecting units, two grounded control units and at least one processor. The device detects and measures the voltages to earth of anodes and cathodes of two groups of direct current buses and judges the two groups of looped networks of a direct current system and the character of the looped networks according to correspondence of the voltage values. With adoption of above technology to detect the looped networks, the invention is able to detect the fault of the looped networks immediately and send an alarm signal. During detection, no low frequency signals are injected to the direct current system so as to ensure safe and stable operation of the direct current system.

Description

technical field [0001] The invention relates to the technical field of DC power supply system monitoring, in particular to a device and method capable of detecting a fault in a DC ring network. Background technique [0002] In order to improve the reliability of the DC power supply system, most of the substations and power plants above 110kV use two sets of batteries and charging devices to distribute the load evenly to the two sets of independent DC systems. For important loads, feeder lines are drawn from two sets of DC systems through circuit breakers or fuses, and any set of DC systems is selected for power supply. According to the power system design specification, the two sets of DC systems must operate independently, but in the actual operation process, there are ring network faults, that is, the two sets of DC systems are electrically connected at one or more points, which seriously affects the safe and stable operation of the power system. harm. [0003] The artic...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 南寅王雪楠王超
Owner BEIJING PEOPLES ELECTRIC PLANT
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