Online monitoring device and method for lightning arrester with series gap line

Abstract

The invention provides an online monitoring device and method for a lightning arrester with a series gap line. The online monitoring device comprises a current sensor, a front-end host, a data processing center and a near-zone acquisition terminal; the current sensor is arranged at the low-voltage end of the gap lightning arrester and used for collecting lightning current and power frequency current generated after a line is struck by lightning and transmitting the lightning current and the power frequency current to the front-end host; the front-end host processes the received current signal to form a standard waveform, and transmits the standard waveform to a data processing center through a network while storing the standard waveform locally; the near-zone acquisition terminal acquires local standard waveform data stored in the front-end host in a non-contact data transmission mode, and sends the standard waveform data to the data processing center; the data processing center analyzes the received standard waveform data and extracts the characteristic quantity of the standard waveform of the lightning current and the characteristic quantity of the standard waveform of the power frequency current; and the data processing center diagnoses the fault degree of the lightning arrester by comparing the duration characteristics of the two types of waveforms.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of arresters, in particular to an on-line monitoring device and method for a line arrester with series gaps. Background technique [0002] As a typical line lightning protection device, the series gap ZnO arrester can limit the overvoltage level of substations and lines through instantaneous conduction and discharge current. In recent years, this device has been widely used in my country's power system. The effect significantly. However, due to the influence of the harsh environment of the line channel, the zinc oxide valve plate of some arresters will crack and be affected by moisture during the long-term network-hung operation. This phenomenon cannot be directly displayed and is extremely difficult to find. Long-term operation with faults leads to a decline in the ability to suppress overvoltage. Even an explosion accident is caused under the action of instantaneous extremely high cur...

AI Technical Summary

Problems solved by technology

In the above-mentioned on-line monitoring technology of arresters, the method of monitoring the leakage current at the low-voltage end of the arrester is used to judge the state of the arrester. This method is more suitable for zinc oxide arresters without gaps. In addition, the monitoring information of the above method does not apply the GPS information of the monitoring device, so it is not necessary It is beneficial for operation and maintenance personnel to accurately search for faulty towers

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