A lightning arrester grounding indicator

Abstract

The invention relates to a grounding indicator for a lightning arrester, which belongs to the technical field of power system inspection. The technical solution is: use the current sensor to detect the strength and duration of the magnetic field induction current of the arrester grounding lead, capture and lock the current greater than 0.5 mA, and then judge by the duration: if the duration of the induced current is less than 50 microseconds, If it is a lightning current, no alarm is required; if the duration is greater than 4 milliseconds, it is a grounding current, and an alarm is displayed, and it is confirmed that this is the fault point. The positive effect of the invention is: after the power system is grounded and tripped due to the internal breakdown of the lightning arrester, the invention can accurately display the alarm at the grounding point, so that the inspectors can find it intuitively, simplify the hard inspection work, and make the grounding point of the lightning arrester found Becomes intuitive and lays the groundwork for a quick restoration of power delivery.

Description

technical field [0001] The invention relates to a grounding indicator for a lightning arrester, which belongs to the technical field of power system inspection. Background technique [0002] Most of the transmission lines in the power grid are ground tripping accidents, and the thunderstorm season is the peak of ground tripping. Especially in the southern part of my country, accidents on transmission lines are basically caused by lightning strikes. The North also accounts for a higher proportion. It is a very effective method to install lightning arresters to prevent overvoltage of power transmission equipment. Effectively protect the safe operation of transmission and distribution lines, but the lightning arrester itself is broken down, resulting in frequent grounding accidents. The ground fault of 10kV and 35kV lines in thunderstorm season should first suspect the arrester. The breakdown itself accounts for more than 50% of the grounding accidents during this period. ...

AI Technical Summary

Problems solved by technology

After a few lightning arresters release the ultra-high voltage lightning current, the internal damage leakage valve cannot be closed normally, resulting in the breakdown of the lightning arrester, causing the grounding trip accident of the transmission line, and causing a large-scale power outage accident, which mostly occurs on 10kV and 35kV lines

The arrester penetrated by lightning causes a grounding accident. When searching for the grounding, it is necessary to search carefully. Sometimes it is necessary to use a high-power telescope or even a helicopter to search to determine the grounding point. However, there are only a small number of obvious breakdown points, accounting for only about 20%. 80% of the surge arresters have no obvious internal breakdown appearance and cannot be directly observed from the ground. They can only be disassembled by climbing poles and carefully observed or measured with instruments.

The problems in the background technology are: uncertainty, blindness, no goal, relying on work experience

Valuable time wasted, with ensuing huge financial loss and severe negative impact

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