Passive lightning arrester performance online monitoring device

Abstract

The invention discloses a passive lightning arrester performance on-line monitoring device. The device comprises a current sensor connected with a lightning arrester; the device further comprises an energy collection circuit, a current signal to voltage conversion circuit, a micro-processing unit, a communication interface unit and a display unit; the input end of the current sensor is connected with the lightning arrester; the output end of the current sensor is connected with the input ends of the energy collection circuit and the current signal to voltage conversion circuit; the output endof the current signal to voltageconversion circuit is connected with the A / D end of the micro-processing unit; the output end of the energy collection circuit is connected with the power supply end ofthe micro-processing unit; the input end of the display unit is connected with the output end I / O of the micro-processing unit; the input end of the communication interface unit is connected with thecorresponding communication interface of the micro-processing unit. According to the device of the invention, the online monitoring energy of the lightning arrester is obtained by utilizing the leakage current of the lightning arrester and utilizing the energy collection circuit, so that the total leakage current and the total lightning stroke frequency of the lightning arrester can be displayedon site under the condition that the lightning arrester does not need an external power supply.

Description

technical field [0001] The invention relates to an on-line performance monitoring device of a passive arrester used in the field of arrester monitoring. Background technique [0002] In terms of lightning arrester performance testing, the main detection methods currently used are divided into periodic power failure prevention test and online live test and detection. [0003] The periodic preventive test is generally carried out in the state of power failure, and it is the earliest and most common detection method used in the power system. At present, for the periodic preventive test, the main test item is the DC test, which measures the leakage current of the surge arrester under the critical action reference voltage U1mA of DC 1mA and 75% of U1mA. meet the requirements. The advantage of this test method is that the measurement results are more accurate and reliable. The disadvantage is that the arrester must be tested for power failure, and the process is cumbersome and i...

AI Technical Summary

Problems solved by technology

[0005] The above methods all require external power supply to monitor the performance of the arrester. However, in many applications, such as 10kV high-voltage switchgear, there is no secondary power supply, which brings great difficulties to the performance monitoring of the arrester.

Many enterprises propose to use battery power supply to realize the performance monitoring of lightning arresters. The main problem is that the battery needs to be replaced by regular power outages, which consumes a lot of energy.

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