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Method and device for quickly detecting multipoint grounding fault of direct current system

A DC system and multi-point grounding technology, which is applied in the field of rapid detection of DC system multi-point grounding faults, can solve problems such as the difficulty of finding and judging faulty branches, achieve great economic and social benefits, and improve work efficiency

Pending Publication Date: 2021-04-16
HUAIBEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that although the prior art DC fault detection device can detect poorly insulated or DC grounded branches, if there are two or more ground faults in the system, it will be very difficult to find and judge the faulty branch. difficulty

Method used

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  • Method and device for quickly detecting multipoint grounding fault of direct current system

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a method for quickly detecting multi-point ground faults in DC systems, the method includes:

[0028] Step S1: Determine the key nodes of N branches in the DC system circuit, and install detection sensor terminals correspondingly at each key node to form an N×N matrix L describing the branches; wherein, the detection sensors are Current Transformer.

[0029] Step S2: Consider system interference, set the differential flow threshold, and construct the differential flow description matrix D. If the i-th branch differential flow exceeds the differential flow threshold, the i-th row and i-th column element of the N×N-dimensional differential flow description matrix D Set to 1, otherwise set to 0, and other elements of the differential current description matrix D are all set to 0; among them, for the nth branch, the current flowing into the nth branch from the positive bus is I1, and the nth branch flows back to the negative bus The current of t...

Embodiment 2

[0035] Corresponding to Embodiment 1 of the present invention, Embodiment 2 of the present invention also provides a device for quickly detecting multi-point grounding faults in a DC system, the device comprising:

[0036] The branch description module is used to determine the key nodes of N branches in the DC system circuit, and install detection sensor terminals correspondingly at each key node to form an N×N matrix L describing the branches;

[0037] The difference flow description module is used to consider system interference, set the difference flow threshold, and construct the difference flow description matrix D. If the difference flow of the i-th branch exceeds the difference flow threshold, the i-th row of the N×N-dimensional difference flow description matrix D The i-th column element is set to 1, otherwise it is set to 0, and the other elements of the difference flow description matrix D are all set to 0;

[0038]The fault judgment module is used to multiply the ma...

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Abstract

The invention discloses a method and a device for quickly detecting a multipoint grounding fault of a direct current system, and the method comprises the steps: determining key nodes of N branches in a loop of the direct current system, correspondingly installing a detection sensor terminal at each key node, and forming an N * N matrix L for describing the branches; considering system interference, setting a differential flow threshold value, constructing a differential flow description matrix D, if the i-th branch differential flow exceeds the differential flow threshold value, setting the i-th row and i-th column elements of the N * N-dimensional differential flow description matrix D to be 1, otherwise, setting the i-th row and i-th column elements of the N * N-dimensional differential flow description matrix D to be 0, and setting other elements of the differential flow description matrix D to be 0; multiplying the matrix L by the difference flow description matrix D to obtain a fault judgment matrix F = f (L * D) = f (F '), f representing an output misjudgment elimination operation, and F' representing a variable of the output misjudgment elimination operation; the method has the advantages that branch circuits and branch circuit faults are described in a matrix mode, and multipoint grounding faults of the direct current system can be quickly judged and found out.

Description

technical field [0001] The invention relates to the field of ground fault detection, and more particularly to a method and device for quickly detecting multi-point ground faults in a DC system. Background technique [0002] In substations and converter stations, the power supply of signal systems, relay protection devices, automatic devices and other equipment is provided by the DC power supply in the power supply system. The reliability of the DC system plays an important role in the safe operation of substations and converter stations. Once the DC system fails, it will seriously endanger the safe and economic operation of the power system, especially when the DC grounding fault occurs, it may cause the automatic protection device to malfunction or refuse to operate. Since the DC system is a complex multi-branch network with a wide distribution range, the probability of ground faults is relatively high. If one point of the DC system is grounded and is not dealt with in tim...

Claims

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Application Information

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IPC IPC(8): G01R31/52
Inventor 赵勇呓孙振兴赵创业赵峻岭高峻王志刚杜朋苗长越陈好吴黎明吕丽君徐建友王明刚石桂平骆静周鹏鲍晓菲
Owner HUAIBEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER
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