A method for online detection of zinc oxide arrester status

Abstract

The invention relates to a zinc oxide lightning arrester state on-line detection method, which is suitable for the power system lightning arrester on-line detection technology field. The zinc oxide lightning arrester state on-line detection method comprises steps that databases are respectively established, and in an initial state of a lightning arrester, resistances under conditions of different voltage levels, temperatures and humidity and resistive current components generated by interphase interferences under the condition of different voltage levels are stored and updated; the leakage total current of the lightning arrester and the voltage of the line of the lightning arrester are detected, and then resistive leakage current without the interphase interferences is acquired, and a voltage and resistive leakage current fundamental wave component is acquired by adopting fast Fourier transform, and therefore the resistance of the lightning arrester is acquired. The resistance is searched in the databases according to the temperature and the humidity of the current operation environment of the lightning arrester, and is compared with the calculated resistance, and then the current state of the lightning arrester is acquired. The zinc oxide lightning arrester state on-line detection method is advantageous in that the influences of the interface interferences, harmonic waves, the temperatures, and the humidity on the parameters of the lightning arrester are effectively reduced, and the current operation state of the lightning arrester is acquired accurately, and the related parameters of the lightning arrester are detected and calculated automatically, and therefore power-cut detection of maintainers is not required, and maintenance efficiency is greatly improved.

Description

technical field [0001] The invention relates to an on-line detection method for the state of a zinc oxide arrester, which is suitable for the technical field of on-line detection of the arrester in a power system. Background technique [0002] In the power grid, lightning arresters must be installed for a large number of distribution transformers and cable lines as lightning protection. Since the zinc oxide arrester cancels the discharge gap and there is leakage current during work, coupled with the long-term operating voltage of the system, deterioration, pollution, or factors such as poor structure and poor sealing that make the internal structure and valve plate damp, will damage the oxidation. The performance of the zinc valve directly endangers the safe operation of the power system. The traditional lightning arrester monitoring method regularly conducts insulation preventive tests during power outages during operation. There are many shortcomings such as low test volt...

AI Technical Summary

Problems solved by technology

Since the zinc oxide arrester cancels the discharge gap and there is leakage current during work, coupled with the long-term operating voltage of the system, deterioration, pollution, or factors such as poor structure and poor sealing that make the internal structure and valve plate damp, will damage the oxidation. The performance of the zinc valve directly endangers the safe operation of the power system

The traditional lightning arrester monitoring method regularly conducts insulation preventive tests during power outages during operation, which has many shortcomings such as low test voltage, long cycle, and bulky equipment, which cannot truly reflect the actual insulation status of the equipment, so defects and failures cannot be found in time

In addition, the current live detection is mainly to detect characteristic quantities such as leakage current and its resistive component. Due to the difficulty of eliminating interphase interference and system harmonics, and the great influence of temperature and humidity, it is impossible to timely and accurately find hidden dangers of arresters. Unable to cope with emergencies

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