Lightning arrester live detection method based on primary phase angle measurement

Abstract

The invention discloses a lightning arrester live detection method based on primary phase angle measurement. The method comprises the following steps: connecting a discharge counter or a resistor in series at a grounding end of a metal oxide lightning arrester, and connecting a power frequency parallel resonance filter circuit in parallel at the two ends; applying a power grid operation voltage to a series circuit through an operation bus; collecting a voltage phase angle and a power grid voltage phase angle of the grounding end of the lightning arrester on the metal oxide lightning arrester by adopting a phase collector to obtain a phase angle difference so as to obtain a phase angle of the lightning arrester; synchronously sending the voltage phase angles acquired at the two ends of the metal oxide arrester to a detection host respectively; using a current transformer to obtain an operation leakage current flowing through the metal oxide lightning arrester, combining the operation leakage current with the phase angle of the lightning arrester, and obtaining a resistive current flowing through the lightning arrester in an operation state through vector decomposition calculation; and judging the performance state of the lightning arrester through the resistive current. The phase angle of the grounding end of the lightning arrester is collected through the power frequency parallel resonance filter circuit, and the measurement precision of the phase angle of the lightning arrester is effectively improved.

Description

technical field [0001] The invention relates to the field of lightning arrester electrification detection, in particular to an arrester electrification detection method based on primary phase angle measurement. Background technique [0002] At present, the live test of surge arresters with a voltage level of 10kV and above obtains the full current vector flowing through the arrester in the operating state by intercepting the leakage current on the discharge counter connected in series with the ground terminal of the arrester. At the same time, the voltage vector on the arrester in the running state is obtained through the secondary terminal on the low-voltage side of the voltage transformer connected in parallel with the arrester. According to the full current vector and voltage vector, the phase angle and resistive current of the arrester are calculated through vector decomposition, so as to judge the performance of the arrester. However, there are still many disadvantages...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of low safety and low precision of the phase angle of the arrester measured in the prior art, and provide a live detection method of the arrester based on a phase angle measurement. The discharge counter in series or both ends of the resistor are connected in parallel to the power frequency parallel resonant filter circuit, and the voltage phase angle between the high voltage terminal and the ground terminal of the arrester is collected synchronously, thereby effectively improving the safety and measurement accuracy of the arrester phase angle test

Images