Live-line tester for lightning arrester

Abstract

The invention relates to a live-line tester for a lightning arrester, wherein the live-line tester is used for live testing of a lightning arrester of an intelligent transformer station. The live-line tester is connected with a lightning arrester that needs to be tested and has the 220-V power voltage in the transformer station. A voltage phase compensation module is embedded into the live-line tester. A signal collection system of the voltage phase compensation module collects a voltage signal of 220-V voltage and a current signal of the transformer station and inputs the signals into a signal conditioning system. The signal conditioning system enables the collected 220-V voltage signal and current signal to be processed by voltage compensation by a connected high-voltage coil and low-voltage coil and thus the voltage and current signals are compensated by the obtained phase consistent with the bus voltage; and the signals pass through a current sensor, an operational amplifier, a resistor, a capacitor, and an AD converter and are connected with a single-chip microcomputer. According to the invention, for live detection work of the lightning arrester, the PT voltage is not collected directly on the premise that detection reliability is ensured; and the accurate phase of the PT voltage is obtained by the 220-V voltage in the station. Therefore, the live testing work efficiency of the lightning arrester and the field equipment security operation stability are improved.

Description

technical field [0001] The invention relates to the technical field of power equipment application tools, in particular to a live tester used for lightning arresters in intelligent substations. Background technique [0002] As one of the important equipment in the power system, the arrester is used to protect various electrical equipment in the power system from being damaged by lightning overvoltage, operating overvoltage, and power frequency transient overvoltage, which is directly related to the power system. The safe and stable operation of the grid, if the aging and damp are not discovered, the impact and loss on the power grid will be huge. Therefore, the arrester test is a routine test in the preventive test procedure. However, the secondary side voltage of the PT in the smart substation cannot be collected. [0003] Metal Oxide Arresters (hereinafter referred to as MOA) are overvoltage protection devices widely used in power systems at present. The MOA operating p...

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the object of the invention of the present invention is to provide a lightning arrester live tester, so that the 220V power supply voltage obtained from the substation is used as a reference voltage, which is in the same phase as the bus voltage and the PT secondary side voltage, so as to Solve the problem of voltage phase acquisition of lightning arrester live test

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