Grounding method for decreasing step voltage of transmission line tower

Abstract

The invention discloses a novel safe grounding method of a transmission line tower. The method includes that a linoleum insulating layer is laid on the upper layer, and a three-dimensional ring-shaped grounding body is laid on the lower layer, so that hazard caused by step voltage and touch voltage of the transmission line tower is reduced. The three-dimensional ring-shaped grounding body comprises an upper layer cylindrical grounding body (4), a middle layer vertical connection body (5), a bottom circular ring (6) and a peripheral welding level radiation pole (7) with a circular ring structure. According to the method, dispersion resistance is effectively reduced, a GPF-94 resistance reducing agent is filled to the inside of the ring shape to improve soil parameters, reduce ground resistance and enlarge an effective cross section of the grounding body, and a good voltage balancing function is achieved. By means of the level radiation pole, current dispersing is greatly performed. The linoleum insulating layer is laid at a position of a peripheral ground voltage balancing body, which is 0.8m above the ground surface, so that permissible value of the step voltage is increased, and value of current which flows through a human body is decreased. The grounding method for decreasing step voltage of the transmission line tower has the advantages of being good in current dispersing and voltage balancing effects of the bottom layer, wide in application range, convenient to construct, corrosion resistant, safe and reliable.

Description

technical field [0001] The invention mainly relates to the field of reducing the step voltage and the contact voltage near the tower of the transmission line, in particular to a grounding method capable of reducing the step voltage and the contact voltage of the tower of the transmission line. Background technique [0002] With the continuous increase of the transmission capacity of the power grid, the short-circuit current when the transmission line is faulty is also increasing. Overhead transmission lines will have insulator grounding short-circuit faults under lightning strikes, various internal overvoltages, pollution flashovers, and bird houses. Due to the limitation of land resources, it is becoming more and more difficult to reduce the grounding resistance of towers. When the grounding short-circuit current enters the ground through the grounding device , it will cause the ground potential of the tower grounding device to rise, and dangerous step voltage and contact v...

AI Technical Summary

Problems solved by technology

Overhead transmission lines will have insulator grounding short-circuit faults under lightning strikes, various internal overvoltages, pollution flashovers, and bird houses. Due to the limitation of land resources, it is becoming more and more difficult to reduce the grounding resistance of towers. When the grounding short-circuit current enters the ground through the grounding device , it will cause the ground potential of the grounding device of the tower to rise, and a dangerous step voltage and contact voltage will be formed on the corresponding parts of the tower. If the step voltage exceeds a certain value, it will cause an electric shock accident to the human body and endanger personal safety.

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