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Short-time discontinuous direct current grounding fault searching method and system

A DC grounding and fault finding technology, applied in fault location, fault detection by conductor type, short-circuit test, etc., can solve the problem of inability to find short-term intermittent insulation faults, achieve rapid fault troubleshooting and improve stability. Effect

Pending Publication Date: 2021-12-10
BEIHAI POWER SUPPLY BUREAU OF GUANGXI GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is impossible to find short-term intermittent insulation faults with the existing portable DC grounding search equipment

Method used

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  • Short-time discontinuous direct current grounding fault searching method and system
  • Short-time discontinuous direct current grounding fault searching method and system
  • Short-time discontinuous direct current grounding fault searching method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 Shown is a DC system analog circuit diagram of a short-term intermittent DC grounding fault finding method, as shown in the figure, the positive DC bus of the DC power supply is connected to one end of the resistor R17, one end of the resistor R19 and one end of the capacitor C9, and the negative DC The bus bar is connected to one end of the resistor R18, one end of the resistor R20, and one end of the capacitor C10, the other end of the resistor R17, the other end of the resistor R18, the other end of the resistor R19, the other end of the resistor R20, the other end of the capacitor C9 and the capacitor C10 The other end of the resistor is grounded; the resistor R17 is equal to the resistance of the resistor R18, indicating the positive and negative insulation resistance of the DC system; the capacitor C9 is equal to the capacitor C10, indicating the ground capacitance of the DC system; the resistance of the resistor R19 and the resistor R20 are equal ...

Embodiment 2

[0044] Such as Figure 4 A schematic structural diagram of a short-time discontinuous DC grounding fault finding system is shown. The system includes a search host, several current characteristic waveform acquisition modules, several clamp transformers CT and several user terminals. In this example, the clamp The transformer CT adopts a highly integrated clamp current transformer, and the user end adopts a mobile phone end. The current characteristic waveform acquisition module is connected to several clamp transformers CT, and the search host is respectively connected to several user terminals and several current characteristic waveform acquisition modules.

[0045] In the specific implementation, the connection between the clamp transformer CT and the current characteristic waveform acquisition module described in this implementation adopts a wired connection, and the connection between the search host and the user terminal and the current characteristic waveform acquisition...

Embodiment 3

[0050] Such as Figure 5 It is a DC bus voltage sampling circuit diagram, the DC bus voltage sampling circuit includes an input module, a negative feedback module and an output module, and the negative feedback module is connected to the input module and the output module respectively.

[0051] The input module includes a resistor R1, a resistor R2, a resistor R3, a diode D3 and an optocoupler OPT1, one end of the resistor R1 is respectively connected to the cathode of the diode D3 and the positive emitter of the optocoupler OPT1, and one end of the resistor R2 is respectively connected to the positive pole of the emitter of the optocoupler OPT1. The anode of the diode D3 is connected to the emitter cathode of the optocoupler OPT1, the receiving end C of the optocoupler OPT1 is connected to the power supply, and the receiving end E of the optocoupler OPT1 is connected to one end of the resistor R3 as the output terminal of the input module It is connected to the negative feedb...

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Abstract

The invention provides a short-time discontinuous direct-current grounding fault searching method and system, and the method comprises the steps: monitoring a voltage-to-ground change waveform of a direct-current bus and a current characteristic waveform of a feeder line, and combining the two waveforms to judge whether direct-current grounding occurs or not. The system comprises a searching host, a current characteristic waveform acquisition module, a pincerlike mutual inductor CT and a user side. The current characteristic waveform acquisition module is matched with the pincerlike mutual inductor CT to detect feeder current characteristic waveforms, select lines and upload the feeder current characteristic waveforms to the searching host, and the searching host detects voltage-to-ground change waveforms of a direct current bus, determines whether a direct current grounding fault occurs in combination with the received current characteristic waveforms, and sends an alarm result to a user side. According to the invention, short-time discontinuous DC grounding fault discovery and line selection can be carried out, and fault information can be transmitted to a mobile phone user, so that the troubleshooting processing work can be rapidly carried out, and the stability and reliability of a DC system are further improved.

Description

technical field [0001] The invention relates to the field of power system fault detection, in particular to a method and system for finding a short-time intermittent DC grounding fault. Background technique [0002] At present, the ground fault of the DC system of the substation depends on the insulation monitoring device for monitoring. The principle used by the current insulation monitoring device is mostly a balance bridge plus a switching bridge for insulation monitoring. This principle takes a long time for alarm line selection. DL / T1392-2014 stipulates in 5.5.1.2 that the response time to the ground insulation fault alarm of the DC system should not exceed 100S, and in 5.5.1.3 specifies that the response time for branch line selection should not exceed 180S. It can be seen that the DC insulation monitoring device can fully meet the needs of the site for a stable ground fault (greater than 3 minutes), and can be located. As for the short-time intermittent ground fault ...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/58G01R31/08
CPCG01R31/52G01R31/58G01R31/085
Inventor 李振东王晓明韦俊年戚焕兴林春梅彭海洋罗崇毅阳建林叶玉贤陈舒婷
Owner BEIHAI POWER SUPPLY BUREAU OF GUANGXI GRID
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