Online monitoring system and method of zinc oxide arrester

Abstract

The invention relates to an online monitoring system and an online monitoring method of a zinc oxide arrester. The online monitoring system comprises an online monitoring main control unit, an arrester leakage current online monitoring unit and a busbar voltage online monitoring unit group, wherein the arrester leakage current online monitoring unit consists of an arrester current acquisition assembly and a first data processing and analyzing assembly, and the busbar voltage online monitoring unit group consists of a busbar voltage acquisition assembly and a second data processing and analyzing assembly. Real-time monitoring for leakage total current, resistive current, capacitative current, the number of lightning stroke and the moment of lightning stroke of the arrester is realized, the magnification times can be automatically adjusted according to the magnitude of the measured current, high-precision measurement is realized, in combination with the working condition in site, monitored data are analyzed and processed, the arrester is prevented from being influenced by temperature and humidity of the environment, the problems of the arrester that leakage current of an insulator or an insulating rod is increased caused by foul or being affected with damp internally, and the like are solved, and accidents are effectively prevented from occurring.

Description

technical field [0001] The invention relates to the field of zinc oxide arrester monitoring, in particular to an on-line monitoring system and method for zinc oxide arresters. Background technique [0002] Zinc oxide arrester is the most widely used arrester at present. Using the good nonlinear volt-ampere characteristics of zinc oxide, the current flowing through the arrester at normal operating voltage is very small, reaching milliamp level or even microampere level; , That is, when the overvoltage acts, the resistance of the zinc oxide arrester to the ground drops sharply, and the overvoltage energy is released, effectively preventing the power equipment from being attacked by lightning shock waves. In order to be able to understand the operating conditions of zinc oxide arresters in real time, corresponding online monitoring technology and online monitoring devices have also been developed. At present, the most widely used type of device for monitoring leakage current a...

AI Technical Summary

Problems solved by technology

The advantage of this device is that the leakage current display is intuitive, but the accuracy is average, and inspection personnel need to check it regularly, and it is not easy to find out in time if there is a problem in operation.

Another type of device that has begun to be applied is the current transformer monitoring instrument, which has the function of remote transmission of monitoring information, but generally has low measurement accuracy, and can only monitor the full current leaked by the arrester, and cannot calculate the resistive current, and cannot monitor the operating status of the arrester. Comprehensive Analysis and Judgment

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