Active calibration method for partial discharge pulse phase

Abstract

The invention relates to an active calibration method for a partial discharge pulse phase. The active calibration method comprises the following steps of: firstly, measuring to obtain a power frequency phase shift of a partial discharge coupling device by using a power frequency high-voltage generator, a capacitive voltage divider and an oscilloscope through an off-line test, then extracting a power frequency component in an on-line monitoring output signal of the partial discharge coupling device and correcting the power frequency component; and further correcting the corrected power frequency component by using the power frequency phase shift of the partial discharge coupling device, then extracting a partial discharge pulse from an online monitoring output signal of the partial discharge coupling device, and finally obtaining a partial discharge pulse phase according to the corrected power frequency component. By combining the characteristics of the partial discharge coupling device and the power frequency component output by the partial discharge coupling device, active calibration of the partial discharge pulse phase is realized, the problem that a power frequency sensor or a trigger device is additionally arranged in current partial discharge monitoring is avoided, and economic and reliable monitoring of partial discharge is realized.

Description

technical field [0001] The invention belongs to the field of electric equipment monitoring, in particular to an active calibration method for partial discharge pulse phases. Background technique [0002] With the transformation of my country's energy structure and the goal of carbon peaking and carbon neutrality, the installed capacity of renewable energy such as hydropower and wind power will develop rapidly. However, the operating conditions of hydropower and wind turbines are complex, and high-voltage equipment such as generators and transformers will age rapidly, so it is very important to accurately monitor and evaluate their status. Partial discharge monitoring is an effective method for evaluating the insulation of high-voltage power equipment. Generally, the type of partial discharge is identified through the distribution pattern of the partial discharge phase. Therefore, pulse phase identification is a key step in partial discharge monitoring. At present, there are...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it needs to install additional step-down, shaping modules and microprocessors, and the construction cost is relatively high, which is not conducive to popularization and application.

Its disadvantage is that it needs to install an additional power frequency sensor in the high-voltage secondary circuit, and it needs to configure two acquisition systems, which leads to high construction costs and is not conducive to popularization and application.

Images