Three-phase symmetric voltage injection-based device and method for detecting grounding wire of distributing circuit

A technology for detection of distribution lines and symmetry, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as temporary grounding detection of unsuitable distribution lines and differences in detection principles of distribution lines, so as to ensure safety, The effect of preventing power transmission and reducing possibility

Active Publication Date: 2015-11-18
GUANGDONG POWER GRID CORP ZHAOQING POWER SUPPLY BUREAU
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Three-phase symmetric voltage injection-based device and method for detecting grounding wire of distributing circuit
  • Three-phase symmetric voltage injection-based device and method for detecting grounding wire of distributing circuit
  • Three-phase symmetric voltage injection-based device and method for detecting grounding wire of distributing circuit

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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 three-phase symmetric voltage injection-based device and a method for detecting the grounding wire of a distributing circuit. According to the technical scheme of the invention, the device outputs an amplitude-stabilized three-phase symmetric detection voltage into a to-be-detected distributing circuit and then detects the present current of the to-be-detected distributing circuit in any phase. According to the amplitude-stabilized three-phase symmetric detection voltage and the present current, the device judges whether the distributing circuit is provided with a grounding wire or not. Based on the three-phase symmetric voltage injection-based device and the method for detecting the grounding wire of the distributing circuit, whether the distributing circuit is provided with a temporary grounding wire or not can be effectively determined. Therefore, the power transmission of the grounding wire or a grounding knife-switch is avoided. The undetected possibility of the temporary grounding wire is reduced. The safety of power operators is ensured.

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 Applications(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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