Online monitoring and early warning system for lightening arrester and control method thereof

Abstract

The invention discloses an online monitoring and early warning system for a lightning arrester and a control method thereof. The monitoring and early warning system comprises the lightning arrester, wherein the lightning arrester is sleeved with a current transformer, a heat insulation sleeve and a rain and dust shielding cover in sequence from inside out; an outlet nozzle is formed in the top ofthe side wall of the rain and dust shielding cover; the bottom of the rain and dust shielding cover is opened and detachably connected with a base of the lightening arrester through a bracket; the heat insulation sleeve is fixedly arranged on the inner wall of the rain and dust shielding cover; the current transformer is fixedly arranged on the inner wall of the heat insulation sleeve; an output coil of the current transformer is connected with a comparator through a rectifying circuit; the output end of the comparator controls a coil of a power-on delay relay to be turned on or off; and a normally-on switch of the power-on delay relay controls an audible and visual alarm to be turned off. The system can reduce the influences, on the leakage current of the lightening arrester, of rain, snow, dust, sunlight and short-time overvoltage, can also carry out statistical analysis on the lightning strike information of power grids, and can issue an early warning signal when the leakage currentof the lightening arrester exceeds the standard.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical equipment, in particular to an online monitoring and early warning system for lightning arresters and a control method thereof. Background technique [0002] With its excellent technical performance, metal oxide arresters (MOA) have gradually replaced other types of arresters and become the replacement protection equipment for power systems. The resistors of zinc oxide surge arresters are subjected to operating voltage for a long time, and there is a leakage current flowing continuously through each resistor in series. The magnitude of this current depends on the thermal stability of the MOA and the aging of the resistors. If the MOA deteriorates under operating load, the normal ground insulation level will be reduced, and the leakage current will increase, resulting in thermal breakdown of the MOA. [0003] Therefore, it is necessary to monitor and warn the leakage current of MOA...

AI Technical Summary

Problems solved by technology

Among them, the temperature rise of the arrester caused by sunlight, the humidity of the arrester caused by rain, the contamination of the outer surface of the arrester, and the short-term overvoltage of the power grid will all cause the increase of the leakage current of the arrester, resulting in the inaccurate detection of the leakage current of the arrester.

[0005] There is a lack of an online monitoring and early warning system for arresters in the prior art, which can reduce the influence of rain, snow, dust, sunlight, and short-term overvoltage on the leakage current of the arrester. When the leakage current of the arrester exceeds the standard, an early warning signal can be sent to remind the management personnel. Remove it for further inspection of its aging degree

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