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Method, device and system for determining single-phase earth fault point

A technology for single-phase ground faults and fault points, which is applied to fault locations, measuring devices, and fault detection according to conductor types. It can solve problems such as large errors, complex calculations, and inaccurate distance measurement. Avoid the effects of inaccurate point-of-failure determination

Active Publication Date: 2021-03-30
广东电网有限责任公司韶关供电局
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-ended ranging method is affected by the transition resistance, and the ranging is inaccurate; the double-ended ranging method needs to consider distributed capacitance, concentrated parameter models, etc., and the calculation is complicated and the error is large

Method used

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  • Method, device and system for determining single-phase earth fault point
  • Method, device and system for determining single-phase earth fault point
  • Method, device and system for determining single-phase earth fault point

Examples

Experimental program
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Effect test

Embodiment 1

[0044] figure 1 It is the flow chart of the method for determining the single-phase ground fault point in the embodiment. This embodiment is applicable to the situation of determining the single-phase ground fault point of the transmission line. The method can be executed by the device for determining the single-phase ground fault point. The device can Realized by software, the device can be configured in electronic equipment, typical electronic equipment includes single-chip microcomputer, refer to figure 1 , the method may specifically include:

[0045] S1. Obtain the zero-sequence current of the local side and the zero-sequence current of the opposite side.

[0046] Exemplarily, in this embodiment, the ground fault point is used as a dividing point, one end of the power transmission line is the local side (M side), and the other end of the power transmission line is the opposite side (N side).

[0047] In this embodiment, the zero-sequence current can be directly measured...

Embodiment 2

[0094] Figure 4 For the block diagram of the device structure for determining the single-phase ground fault point in the embodiment, refer to Figure 4, this embodiment proposes a device for determining a single-phase-to-ground fault point, including: a communication module 100 and a fault point determination module 200 .

[0095] The communication module is used to obtain the zero-sequence current of the local side and the zero-sequence current of the opposite side.

[0096] The fault point determination module is used to represent the calculated value of the first fault by using the zero-sequence current on this side, the distance between the first fault point and the unit zero-sequence impedance, and represent the second Fault calculation value: determine the fault point distance according to the difference between the first fault calculation value and the second fault calculation value, and determine the single-phase ground fault point according to the fault point distan...

Embodiment 3

[0108] This embodiment proposes a system for determining a single-phase ground fault point, including a differential protector, a single-chip microcomputer is configured in the differential protector, and the device for determining the single-phase ground fault point described in Embodiment 2 is configured in the single-chip microcomputer. The working process and beneficial effects of the movable protector are the same as the corresponding content recorded in the second embodiment, and will not be repeated here.

[0109] Exemplarily, in this embodiment, the differential protector adopts an optical fiber differential protector, and the communication between the differential protector on the local side and the differential protector on the opposite side is realized through an optical fiber, which can ensure communication efficiency and improve the determination of single-phase The timeliness of the ground fault point.

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Abstract

The invention discloses a method, device and system for determining a single-phase earth fault point. The method for determining the single-phase earth fault point comprises the following steps of: acquiring a zero-sequence current on a local side and a zero-sequence current on an opposite side; representing a first fault calculation value by utilizing the zero-sequence current of the local side,a first fault point interval and unit zero-sequence impedance, representing a second fault calculation value by utilizing the zero-sequence current of the opposite side, a second fault point intervaland the unit zero-sequence impedance, and determining the first fault point interval and the second fault point interval according to the difference value of the first fault calculation value and thesecond fault calculation value; and determining a single-phase earth fault point according to the first fault point interval or the second fault point interval. According to the method provided by theinvention, when equations are constructed, distributed capacitance, lumped parameter models and other parameters for improving the complexity of the equation set are not contained; the part, containing transition resistance, in the fault point solving equation set can be eliminated in a subtraction mode, and the accuracy of the determination of the fault point can be improved.

Description

technical field [0001] Embodiments of the present invention relate to power distribution technology, and in particular to a method, device and system for determining a single-phase ground fault point. Background technique [0002] High-voltage transmission line is the lifeblood of the power system, as the link of power transmission, it is an important part of the power system. After the transmission line fails, it is of great significance to quickly find the location of the fault point and deal with potential safety hazards in time for the safe and stable operation of the system and the reliability of power supply. [0003] Single-phase-to-ground short-circuit faults, two-phase phase-to-phase short-circuit faults, and two-phase-to-ground short-circuit faults are the main fault types of transmission lines in large-current grounding systems, among which single-phase to ground short-circuit faults are the most common, accounting for about 75% of transmission line faults above....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/085G01R31/088G01R31/52G01R31/58Y04S10/52
Inventor 徐兴发韦超刘元兴吴勇曹志辉孙波贾恒杰腾昊
Owner 广东电网有限责任公司韶关供电局