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Pole tower earthing resistance quick testing method without unfastening wire and device

A technology of ground resistance and measurement method, applied in the direction of ground resistance measurement, etc., can solve problems such as low measurement efficiency, high labor intensity, and difficult engineering realization

Active Publication Date: 2006-09-06
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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AI Technical Summary

Problems solved by technology

The biggest disadvantage of the current tower grounding resistance measurement is that it is difficult to realize the project. In the usual situation, when there are two or more grounding down-conductors, it is generally necessary to use an electric welding machine to weld the welded nuts during the measurement. ; or unscrew the nut
A measurement team of 3 to 4 people can only measure 4 to 5 base towers at most in one working day. The measurement efficiency is extremely low, the labor intensity is high, and there may be disadvantages such as twisted bolts, slipped wires, and even failure to restore grounding.
If a power supply company has a total of 5,000 bases of 110kV and above transmission line towers, it takes 1,000 days / group to test all of them, and the cost is about 800,000 yuan

Method used

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  • Pole tower earthing resistance quick testing method without unfastening wire and device
  • Pole tower earthing resistance quick testing method without unfastening wire and device
  • Pole tower earthing resistance quick testing method without unfastening wire and device

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Embodiment Construction

[0036] The implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] figure 1 It is a schematic diagram of a power transmission line, which is a power transmission tower with lightning protection wires and overhead ground wires. According to the basic idea of ​​the present invention, the following two technical methods are used to measure:

[0038] 1) figure 2 In order to use clamp PT and CT to measure the schematic diagram, use clamp voltage transformers (referred to as clamp PT) and clamp current transformers (referred to as clamp CT) with the same number of grounding down conductors as the tower grounding, and do not untie the tower grounding. For the down-leads, clamp the pliers PT and CT to all the grounding down-leads; or,

[0039] 2) image 3 In order to use strip-shaped PT, CT measurement schematic diagram, use strip-shaped voltage transformer for short (strip-shaped PT) and strip-shaped...

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Abstract

Wherein, with embed-meter method, applying split-core current transformer (PT) and split-core current transformer (CT) with same wire number as the tower ground wire to clamp all tower ground wires; or applying strip-shape PT and CT to enclose whole tower; filtering and analyzing the measured data to obtain the real and imaginary parts of fundamental wave component of voltage and current signals; calculating with special voltage-drop algorithm to obtain the target resistance. This invention improves efficiency, and reduces cost.

Description

technical field [0001] The invention belongs to the high-voltage technical field of electric power science, and relates to a method and device for measuring the grounding resistance of transmission poles and towers, in particular to a method and device for quickly measuring the grounding resistance of power transmission poles and towers. Technical aspects of safety maintenance of transmission towers. Background technique [0002] The grounding resistance value of transmission towers is of great significance for reducing the lightning tripping rate of transmission lines. It is particularly important to periodically measure the grounding resistance of transmission towers before they are put into use and during operation. The electric power industry standard DL / T 596-1996 "Preventive Test Procedures for Power Equipment" This has been expressly stipulated. Therefore, accurately, quickly and conveniently measuring the grounding resistance value of transmission towers is an impor...

Claims

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Application Information

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IPC IPC(8): G01R27/20
Inventor 李澍森陈晓燕陈绍英韩芳王亚军
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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