On-line monitor of lighting arrester

Abstract

Online device for monitoring high AC voltage zinc oxide arrester with no gap includes three monitors, data collector, data processor, voltage comparator and computer. The three monitors are connected to ABC three phases of the arrester. Output ends are connected to data collector, data processor, voltage comparator properly. Output end of the data processor is connected to computer. The arrester is composed of lightning current sensor and converter of monitoring leakage current. Newest digital processing, embedding type techniques and communication technical measures are adopted to monitor arrester. Resistance current, relevant parameters, measured data and historic data can be printed out and alarmed. Features are reasonable design and high reliability.

Description

Technical field [0001] The invention relates to an on-line monitoring device for a high-voltage AC gapless zinc oxide arrester. Background technique [0002] Surge arresters are protective devices for high-voltage electrical equipment, but under the action of high power frequency and high voltage for a long time, the arrester gradually ages. The characteristic is that the resistive current increases, but the change of the full current is not obvious. It is not enough to try to find out that the aging of the arrester is not enough. Even if the arrester is qualified in the pre-test, breakdown damage may occur during operation. Area blackout accident. If the aging arrester can be found early, it can be withdrawn from operation early, which can improve the safety and stability of power grid operation. At present, most of the lightning arrester online monitoring devices used are to add an ammeter on the basis of the overvoltage action counter, and the other is to add an I / F con...

AI Technical Summary

Problems solved by technology

At present, most of the lightning arrester online monitoring devices used are to add an ammeter on the basis of the overvoltage action counter, and the other is to add an I / F converter on the basis of the above, and convert the measured electrical signal These two methods can only monitor the leakage current and the number of overvoltage actions of the arrester. Although the latter can transmit the signal to the outside and monitor it centrally in the control room, it does not affect the resistive current of the arrester. The magnitude of the lightning current cannot be monitored, and the status of the arrester in operation cannot be provided in a timely and truthful manner. The safety and stability of the power grid operation cannot be guaranteed, let alone unattended modern management.

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