High-voltage switch cabinet partial discharge monitoring system and method based on capacitive coupling method

Abstract

The invention provides a high-voltage switch cabinet partial discharge monitoring system based on a capacitive coupling method. The system comprises monitoring equipment and a remote monitoring center. The monitoring equipment comprises a capacitive sensor, a signal conditioning circuit, a signal processor circuit and a microprocessor circuit; the capacitive sensor is used for collecting partial discharge information; the signal conditioning circuit is used for amplifying and filtering the acquired partial discharge information, and then converting the processed partial discharge signal into a digital signal; the signal processor circuit is used for carrying out feature extraction on the digital signal to obtain feature quantity data; the microprocessor circuit is used for integrating and analyzing the characteristic quantity data and converting the characteristic quantity data into an image signal, and then the microprocessor circuit uploads the characteristic quantity data and the image signal to the remote monitoring center. The invention further provides a high-voltage switch cabinet partial discharge monitoring method based on the capacitive coupling method. Real-time monitoring of partial discharge information is facilitated.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a high-voltage switch cabinet partial discharge monitoring system and method based on a capacitive coupling method. Background technique [0002] The application of high-voltage switchgear in the power system is becoming more and more extensive. Due to the limitation of the environmental factors of the high-voltage switchgear use scene, the high-voltage switchgear needs to be equipped with an insulation system to ensure the safety of the high-voltage switchgear. The insulation system of the high-voltage switchgear insulation system The characteristics will deteriorate with the use of high-voltage switchgear, and more than half of the deterioration of high-voltage switchgear is caused by partial discharge. Although partial discharge generally does not cause penetrating breakdown of insulation, it can cause local damage to the dielectric. If partial discharge exists for a l...

AI Technical Summary

Problems solved by technology

Although partial discharge generally does not cause penetrating breakdown of insulation, it can cause local damage to the dielectric. If partial discharge exists for a long time, it will cause damage to the insulation system. Therefore, how to monitor partial discharge in real time to eliminate potential insulation failures problem to be solved

[0003] The Chinese patent published on January 18, 2017 with the publication number 103930789B designed a device and method for remote monitoring of partial discharge in electrical equipment for partial discharge. Ultrasonic detection is used to detect partial discharge, which meets the requirements for partial discharge. The demand for real-time monitoring of discharge, but the effective detection range of ultrasonic detection method is small, the sensitivity is not high, and there may be omissions in the detection of partial discharge

[0004] The Chinese patent with the publication number 104502821B published on March 20, 2018 uses a capacitive sensor with higher sensitivity to obtain partial discharge information on the basis of the above, and feeds back the partial discharge information through the spectrum curve, but the partial discharge will occur in the In different scene environments, partial discharges may occur in air gaps, oil gaps, or extremely uneven electric field distributions in the medium. These different discharge models cannot be distinguished

Images