Non-residual voltage monitoring device for gapless metal oxide lightning arresters and measurement method

Abstract

The invention relates to the technical field of on-line lightning arrester monitoring, in particular to a non-residual voltage monitoring device for gapless metal oxide lightning arresters and a measurement method. A non-residual voltage method is utilized to monitor the operating state of a lightning arrester on line. The non-residual voltage monitoring device comprises a case and an internal circuit board; the case is provided with an outer cover, which is provided with a display screen window, and an LED (light-emitting diode) display is mounted on the end cover and displays in the window; the outer cover is also provided with lugs, cable holes and jacks; and the internal circuit board comprises a sensor part, a central processor MCU (microprogrammed control unit), a clock circuit, a memory circuit, a signal measurement and conversion circuit, a protection circuit and a communication circuit. The non-residual voltage monitoring device can monitor the parameters of the lightning arrester, such as total current, resistive current and frequency of action, and has the functions of local display, remote communication, data storage and the like. The non-residual voltage monitoring device is applicable to the on-line monitoring of lightning arresters of various voltage levels, can completely substitute for conventional total current meters and act counters, and has a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of arresters, in particular to a non-gap metal oxide arrester non-residual voltage monitoring device and a measuring method. It is to carry out online monitoring on the operation state of the arrester through the method of no residual voltage. Background technique [0002] With the advancement of electronic technology and the in-depth study of MOA, some on-line monitoring instruments have gradually appeared. These instruments are easy to carry and easy to use. They do not need to be powered off to remove the MOA. Manual inspections are used to directly measure performance parameters such as leakage current and voltage of the MOA, which greatly improves work efficiency and avoids many inconveniences of offline monitoring. However, the operating conditions of MOA are very complex, and the influences of interphase coupling capacitance and system voltage harmonics are intertwined. There a...

AI Technical Summary

Problems solved by technology

However, the operating conditions of MOA are very complex, and the influence of interphase coupling capacitance and system voltage harmonics are intertwined.

Using the above-mentioned online monitoring instruments to monitor MOA still has the disadvantages of low detection accuracy and insufficient real-time performance.

Today's lightning arrester online monitoring devices used in the field are equipped with resistors, which makes the device leave a residual voltage when it is struck by lightning, and this type of device can only measure the peak value of the full current, but cannot measure the resistive current value, and lacks the state of the arrester. an important criterion

The traditional lightning arrester monitoring device also does not have the remote communication function, which does not meet the basic requirements of the current smart substation

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