Lightning arrester with built-in current transformer and using method thereof

Abstract

The invention relates to a lightning arrester with a built-in current transformer and a using method thereof and belongs to the technical field of online monitoring of lightning arresters. According to the technical scheme, a current transformer (10) is arranged outside an insulating cylinder or insulation paste structure (3); an external insulator (2) is arranged outside the current transformer (10); and a current transformer output line (11) of the current transformer (10) is connected with a current transformer output signal interface (12) on a lower flange (5), wherein the current transformer output interface is connected with an external measuring instrument or an online lightning arrester monitor. Factors influencing leakage current measurement accuracy and reliability of the lightning arrester under an operating voltage are eliminated on premise of not changing the parameter performance and main body structure of the lightning arrester under, so that accurate measurement of theleakage current of the lightning arrester under the operating voltage is realized, the lightning arrester installation form is simplified, the installation components are decreased, and the online lightning arrester monitoring reliability and accuracy are improved.

Description

technical field [0001] The invention relates to a lightning arrester with a built-in current transformer and a use method thereof, which are used for preventing lightning overvoltage in a power system and online monitoring of the lightning arrester, and belong to the technical field of lightning arresters and online monitoring thereof. Background technique [0002] Surge arrester is a very important overvoltage protection device in the power system, used to prevent lightning overvoltage in the power system. Because of the advantages of small nonlinear coefficient, good protection characteristics, strong energy absorption capacity, large flow capacity, simple structure and good stability, zinc oxide arresters are currently the most widely used. The structure of the zinc oxide arrester is generally as attached figure 1 shown. In the figure, 1 is the upper flange, which is made of metal and conducts electricity; 2 is the external insulation, usually made of porcelain or silic...

AI Technical Summary

Problems solved by technology

Since the zinc oxide valve itself is a nonlinear element, and the resistance and nonlinear characteristics of different zinc oxide valves are not exactly the same, the numerical dispersion obtained by this series of partial pressure is very high, and the measurement accuracy is very high. cannot be guaranteed

Second, inserting a set of low-pressure zinc oxide valve plates at the lower part of the original arrester zinc oxide valve plate will inevitably change the working parameters and characteristics of the original arrester

First, since the zinc oxide valve itself is a nonlinear element, and the resistance and nonlinear characteristics of different zinc oxide valves are not exactly the same, the numerical value obtained by the series divided pressure is very discrete, and the measurement accuracy cannot be guaranteed

Second, inserting a resistor at the lower part of the zinc oxide valve plate of the original arrester will inevitably change the working parameters and characteristics of the original arrester

In particular, the Chinese Invention Patent No. CN201410534755.X scheme mentioned that two electrodes should be led out on the outer sealing umbrella cover, which is a great hidden danger for arresters with very high sealing requirements.

Therefore, this patent cannot solve the inherent problems of the above-mentioned arrester structure and the online monitoring method of arrester leakage current under the corresponding operating voltage.

At present, the existing technology does not have an effective solution to the above problems

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