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Power distribution network different-place two-point grounded short circuit fault fast recognizing and isolating method based on wide-range information

A wide-area information and grounding short-circuit technology, which is applied in the control field of rapid identification and isolation of two-point grounding short-circuit faults in different locations, can solve the problem of power distribution lines and power equipment insulation weak point breakdown, voltage rise, and two-point grounding short-circuit in different places And other issues

Active Publication Date: 2014-03-05
DALI POWER SUPPLY BUREAU YUNNAN POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a single-phase grounding occurs in the system, the voltage of the other two phases rises, which may cause the weak point insulation of the distribution lines and power equipment in the system to break through, thus forming a two-point grounding short circuit in different places

Method used

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  • Power distribution network different-place two-point grounded short circuit fault fast recognizing and isolating method based on wide-range information
  • Power distribution network different-place two-point grounded short circuit fault fast recognizing and isolating method based on wide-range information
  • Power distribution network different-place two-point grounded short circuit fault fast recognizing and isolating method based on wide-range information

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Example 1: Two points in different places on the same line are grounded, the system diagram is as follows figure 1 As shown, it is now assumed that the distribution line L 1 on f 1 At 0.18s, a phase-B ground fault occurs, f 2 At 0.38s, a phase C ground fault occurs, that is, the system has two ground faults in different places, and the two faults are located on the same line. Line L 1 The number of overcurrent phases of each FTU above is shown in Table 2 below

[0020] Table 2

[0021]

[0022] Fault isolation based on the above table: that is, through the FTU 2 、FTU 3 、FTU 4 、FTU 5 Issue a command to open the corresponding four circuit breakers to complete fault isolation.

Embodiment 2

[0023] Example 2: Now assume that the distribution line L 1 on f 1 A phase-to-ground fault occurs at point B, and the distribution line L 2 on f 2 Point C ground fault occurs, that is, the system has ground faults in two places in different places, and the two faults are located on different distribution lines. The number of overcurrent phases of each FTU on lines L1 and L2 is detailed in Table 3 below

[0024] table 3

[0025]

[0026] Perform fault isolation based on the above table: that is, issue commands through FTU2, FTU3, FTU7, and FTU8 to disconnect the corresponding four circuit breakers to complete fault isolation.

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Abstract

The invention discloses a power distribution network different-place two-point grounded short circuit fault fast recognizing and isolating method based on wide-range information. In a power distribution network system with a neutral point not directly connected with the ground, a power distribution line is sectioned according to the distribution situation and the fault happening situation of loads of the power distribution line, and intelligent terminals are arranged at the sectioned nodes of the power distribution line and used for monitoring current changing situations of the sections of the power distribution line in real time. In the power distribution network system with the neutral point not directly connected with the ground, when the single-phase earth fault happens at a certain position of the power distribution line, the sound phase voltage to earth is risen by times, and if a certain sound phase insulating weak spot is broken down, the different-place two-point grounding fault is formed. When the second single-phase grounding fault occurs, a loop is formed by two grounding points through the ground, and the corresponding fault phase current can be sharply increased. To prevent the fault from being further expanded, the corresponding intelligent terminal immediately makes a response, and the section where the fault exits is judged and isolated.

Description

technical field [0001] The invention relates to the technical fields of power system stability and control and power system relay protection, in particular to a control method for rapid identification and isolation of two-point grounding short-circuit faults at different locations. Background technique [0002] In the low-voltage power grid, the operation mode of the low-current grounding system is generally adopted, which can ensure the continuity of the user's power supply when a single-phase ground fault occurs in the power grid. However, when a single-phase grounding occurs in the system, the voltage of the other two phases will rise, which may cause the weak point insulation of the distribution lines and power equipment in the system to break through, thus forming a two-point grounding short circuit in different places. When a two-point grounding short circuit occurs in the system, the voltage distribution is different from that of a two-phase short circuit at the same ...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCY04S10/522Y04S10/52
Inventor 黄滇生束洪春熊西林董俊苏沛轩胡祖伟杨文波张家红郭华宗杨丰收刘伟苏友聪何国斌赵磊
Owner DALI POWER SUPPLY BUREAU YUNNAN POWER GRID
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