Zinc oxide arrester monitoring device

Abstract

The invention provides a zinc oxide arrester monitoring device, which comprises an active sensing unit, a signal processing unit and a field display unit which are sequentially connected, wherein the active sensing unit is used for sensing arrester end shield signals in a zinc oxide arrester ground loop, and the arrester end shield signals are converted into lightning stroke data signals to be output to the signal processing unit; the signal processing unit is used for carrying out digital signal processing on the lightning stroke data signals to obtain display data information; and the field display unit is used for displaying the display data information input from the signal processing unit. The zinc oxide arrester monitoring device disclosed by the invention does not affect the grounding mode of a zinc oxide arrester and the reaction accuracy on lightning stroke, data processing errors are reduced, field digits of data information are visualized, the zinc oxide arrester monitoring device can be seamlessly connected with a monitoring device of the existing transformer substation, and accurate state estimation, fault diagnosis and thunderbolt condition records of the zinc oxide arrester are realized through fault analysis and diagnosis.

Description

technical field [0001] The invention relates to a monitoring device for a lightning arrester, in particular to a monitoring device for a zinc oxide lightning arrester. Background technique [0002] Zinc oxide lightning protection (MOA) is mainly used to limit the lightning overvoltage transmitted from the line or the internal overvoltage caused by operation, and is one of the important protection devices to ensure the safe operation of the power system. However, due to the long-term exposure to power frequency voltage, impulse voltage, and various external environmental factors, the zinc oxide lightning arrester tends to age, which destroys its insulation properties, resulting in thermal collapse and even explosion. In order to ensure the normal function of the arrester, it is necessary to regularly detect the state of the arrester and the number of lightning strikes. [0003] The existing technical solutions generally realize the counting of the number of lightning strikes...

AI Technical Summary

Problems solved by technology

[0003] The existing technical solutions generally realize the counting of the number of lightning strikes by discharging a capacitor and a nonlinear loop coil. This method has high requirements for components. or valve aging) and the protection device burns out, resulting in the failure of the lightning arrester to be properly grounded and causing a zinc oxide lightning protection explosion accident

Moreover, this method cannot record the lightning strike time and cannot realize the treatment of the insulation performance of the arrester.

[0004] Now there is another method is to use a single CT to monitor the leakage current of the arrester, and cooperate with the above-mentioned mechanical lightning strike counter to realize the monitoring of the arrester, but this method cannot realize the capture of lightning, the recording of the time of lightning and the realization of zinc oxide lightning protection burst fault monitoring

[0005] The above-mentioned technical scheme has low detection accuracy, and it is difficult to carry out accurate state assessment, fault diagnosis and lightning strike record for zinc oxide lightning protection

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