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Device and method for detecting ground wire of distribution line based on three-phase symmetrical voltage injection

A distribution line, symmetrical detection technology, applied in the direction of measurement device, measurement of electricity, measurement of electric variables, etc., can solve the problems of temporary grounding line detection that is not suitable for distribution lines, and differences in detection principles of distribution lines, to ensure safety, The effect of preventing power transmission and reducing possibility

Active Publication Date: 2018-07-27
GUANGDONG POWER GRID CORP ZHAOQING POWER SUPPLY BUREAU
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the complexity of distribution lines and the differences in detection principles, these systems and equipment are not suitable for temporary grounding detection of distribution lines

Method used

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  • Device and method for detecting ground wire of distribution line based on three-phase symmetrical voltage injection
  • Device and method for detecting ground wire of distribution line based on three-phase symmetrical voltage injection
  • Device and method for detecting ground wire of distribution line based on three-phase symmetrical voltage injection

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Embodiment Construction

[0026] like figure 1 As shown, an embodiment of the present invention is shown, a distribution line ground wire detection device based on three-phase symmetrical voltage injection, including a detection voltage output module 100 , a current sampling module 200 and a control module 300 .

[0027] The detection voltage output module 100 is bidirectionally connected with the control module 300 and is used to output a three-phase symmetrical detection voltage with stable amplitude and adjustable frequency. The detection voltage output module 100 is also used to connect with the distribution line to be tested, and inject the three-phase symmetrical detection voltage into the distribution line to be tested.

[0028] The current sampling module 200 is used to connect with the distribution line to be tested, and detect the current current of any phase in the distribution line to be tested.

[0029] The control module 300 judges whether there is a ground wire in the power distribution...

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Abstract

The invention relates to a detection device and method for a distribution line ground wire based on three-phase symmetrical voltage injection. The three-phase symmetrical detection voltage with stable amplitude is injected into the distribution line to be tested, and the current current of any phase in the distribution line to be tested is detected. According to the three-phase symmetrical detection voltage and current current, it is judged whether the distribution line to be tested is There is a ground wire. The distribution line ground wire detection device and method based on three-phase symmetrical voltage injection proposed by the present invention can effectively judge whether there is a temporary ground wire on the distribution line to be tested, prevent power transmission with a ground wire or a ground knife switch, and reduce temporary grounding Possibility of line missed detection ensures the safety of electric workers.

Description

technical field [0001] The invention relates to the field of power grid fault detection, in particular to a detection device and method for a distribution line grounding wire. Background technique [0002] Temporary ground connection of distribution lines is an important part of distribution network operation. During the maintenance and transformation of distribution lines, temporary ground wires must be connected to ensure the safety of maintenance equipment and staff. After the overhaul and reconstruction process is completed, the temporary grounding wire and related devices must be removed before the substation can be switched on for power transmission. If the grounding wire is still not completely removed before the power is switched on, the accident of "power transmission with grounding wire closed" will occur, that is, a three-phase short circuit. After the three-phase short circuit occurs, the current in the line will increase suddenly, which will not only damage the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 关飞刘明路军余涛程乐峰瞿凯平殷林飞陈艺璇黄骏翅郑宝敏徐茂鑫
Owner GUANGDONG POWER GRID CORP ZHAOQING POWER SUPPLY BUREAU
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