Large-current outdoor real model simulation test method for testing lightning impulse characteristics of grounding device

Abstract

The invention relates to a simulation test method for testing the lightning protection performance of a pole and tower grounding device of high-voltage power transmission line. The existing impulse grounding test process has the problem that a test model is simple and small in comparison with a real grounding device, or the problem that the simulation experiment has large gap from the real condition resulting from the large difference between a test power supply and the real lightning current. The simulation test method provided by the invention comprises the following steps: measuring soil resistivity of the test field; determining the position of a voltage reference point during the impulse grounding test according to the power frequency ground resistance measurement result of the grounding device; arranging voltage and current leads during the impulse grounding test; carrying out large-current impulse grounding measurement of the grounding device; measuring the power frequency ground resistance of the grounding device again in such a manner that all electrodes are located in the same positions as in the previous measurement; and analyzing the impulse test result. The simulation test method provided by the invention can narrow the gap between the simulation test and the real condition, and can be used for resistance reduction scheme optimization and impulse performance evaluation of the pole and tower grounding device of the high-voltage power transmission line.

Description

technical field [0001] The invention relates to the technical field of overvoltage safety protection, in particular to a simulation test method for the lightning protection characteristics of a tower grounding device of a high-voltage transmission line, which is used to evaluate the impact characteristics of a tower grounding device of a high-voltage transmission line, and is especially suitable for Initial design phase and operational evaluation phase of grounding installations. Background technique [0002] The tower grounding device needs to release the lightning current to the ground when the transmission line or the tower is struck by lightning, so that the potential rise of the tower is as small as possible, so as to reduce the lightning counter-tripping rate, so the design and evaluation of the grounding device are very important for the lightning protection of the transmission line. important. [0003] In terms of the design of tower grounding devices, the tradition...

AI Technical Summary

Problems solved by technology

However, the current experimental research has the following problems: 1. The simulation test is carried out in a small-scale simulation pool in the laboratory, and the grounding system used is much smaller than the actual grounding device; The actual lightning current is far apart; 3. The test model is single and simple, but the grounding device of the actual tower is complex and diverse

[0004] In short, in the current test process of impact grounding, or the test model is small and simplistic compared with the actual grounding device, or the test power supply is far from the actual lightning current, resulting in a large gap between the simulation test and the actual situation. It is necessary to carry out high-current real-type simulation experiments

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