Direct-current transmission line fault online positioning terminal, method and system

A technology for DC transmission lines and locating terminals, which is applied to fault locations, detecting faults according to conductor types, and detecting faults by pulse reflection method, which can solve the problems of excessive fault resistance, low reliability, etc. , improve reliability, improve the effect of precision

Pending Publication Date: 2020-03-27
STATE GRID NINGXIA ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantages of low reliability in the above-mentioned prior art and the accuracy is greatly affected by the length of the DC transmission line and the excessive fault resistance, the present invention provides an online fault location terminal for DC transmission lines. The terminal includes an open-type magnetic ring, a high-frequency Pulse generator, non-contact sensor and conversion device; open magnetic ring, connected to the neutral point of the DC transmission coupling capacitor, used to construct the traveling wave boundary; high-frequency pulse generator connected to the neutral point of the DC transmission coupling capacitor , used to inject the generated hi...

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  • Direct-current transmission line fault online positioning terminal, method and system
  • Direct-current transmission line fault online positioning terminal, method and system
  • Direct-current transmission line fault online positioning terminal, method and system

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Embodiment 1

[0060] Embodiment 1 of the present invention provides an online fault location terminal for DC transmission lines, such as figure 2 As shown, it specifically includes an open magnetic ring, a high-frequency pulse generator, a non-contact sensor and a conversion device;

[0061] The open magnetic ring is connected to the neutral point of the DC transmission coupling capacitor, which is used to construct the traveling wave boundary and prevent the high-frequency pulse signal generated by the high-frequency pulse generator from being injected into the ground;

[0062] The high-frequency pulse generator is connected to the neutral point of the DC transmission coupling capacitor, and is used to inject the generated high-frequency pulse signal into the DC transmission line based on the traveling wave boundary;

[0063] The non-contact sensor is installed on the first-stage tower at the exit of the converter station to collect the analog voltage signal of the DC transmission line; ...

Embodiment 2

[0077] Embodiment 2 of the present invention provides an online fault location method for DC transmission lines, such as Figure 5 As shown, the specific process is as follows:

[0078] S101: Determine the fault characteristics of the online fault location terminal based on the digital voltage signal collected by the fault online location terminal;

[0079] S102: Determine the fault type based on the reflected wave amplitude at the fault point and the reflected wave amplitude at the opposite end of the line;

[0080] S103: Determine the fault location based on the fault type, the distance between the fault point and the measurement point, the time of the reflected wave at the fault point, the time of the reflected wave at the opposite end of the line, and the propagation speed of the traveling wave;

[0081] The fault characteristics include the time of the reflected wave at the fault point, the amplitude of the reflected wave at the fault point, the time of the reflected wav...

Embodiment 3

[0095] Embodiment 3 of the present invention provides an online fault location system for DC transmission lines, including:

[0096] The data receiving module is used to receive the digital voltage signal sent by the fault online location terminal;

[0097] The first determination module is used to determine the fault characteristics of the fault online location terminal based on the digital voltage signal;

[0098] The second determination module is used to determine the fault type based on the reflected wave amplitude of the fault point and the reflected wave amplitude of the line opposite end;

[0099] The positioning module is used to determine the fault location based on the fault type, the distance between the fault point and the measurement point, the time of the reflected wave at the fault point, the time of the reflected wave at the opposite end of the line, and the propagation speed of the traveling wave;

[0100] The fault characteristics include the time of the re...

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Abstract

The invention provides a direct-current transmission line fault online positioning terminal, method and system. The terminal comprises an open-type magnetic ring, a high-frequency pulse generator, a non-contact sensor and a conversion device, the open-type magnetic ring and the high-frequency pulse generator are both connected to a neutral point of the direct-current power transmission coupling capacitor, and the non-contact sensor and the conversion device are installed on a first-stage tower at an outlet of a converter station. According to the invention, the reliability of fault positioningis greatly improved, the precision is less influenced by the length of the direct-current transmission line and the excessive resistance of the fault, and the positioning precision is improved. According to the invention, the direct-current transmission line is segmented through the plurality of distributed fault online positioning terminals, so that the length of the direct-current transmissionline is indirectly shortened. According to the invention, the fault type is identified, the corresponding fault online positioning is selected based on different fault types, the precision is high, and the online positioning of the high-resistance fault is realized.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to an online fault location terminal, method and system of a direct current transmission line. Background technique [0002] In recent years, HVDC transmission has developed rapidly in my country, and fault location of HVDC transmission lines is of great significance for the rapid elimination of HVDC transmission line faults, the restoration of power supply, and the safety and stability of the power grid. Transmission line fault location can be divided into active location method and passive location method in principle. The passive location method uses the steady-state or transient components generated by the fault to complete the fault location. The passive location method can automatically complete the location analysis after the fault because it does not require the cooperation of one-time equipment. It is the main location method used in practical engineering. ...

Claims

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Application Information

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IPC IPC(8): G01R31/11G01R31/08
CPCG01R31/086G01R31/11
Inventor 史磊吴保义刘若鹏王小立韦鹏柴斌冯志畅陈东许勇郭宁明
Owner STATE GRID NINGXIA ELECTRIC POWER
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