Partial discharge monitoring system for on-load tap-changer of transformer

Abstract

The invention discloses a partial discharge monitoring system for an on-load tap-changer of a transformer. The partial discharge monitoring system comprises a sampling terminal and an intelligent monitoring terminal, the sampling terminal sends the sampling signal information to the intelligent monitoring terminal, and the intelligent monitoring terminal receives the sampling signal information sent by the sampling terminal and carries out comprehensive processing; the sampling terminal comprises a control module and a gas detection module, the gas detection module is connected with the control module, and the gas detection module collects a gas signal and transmits the gas signal to the control module; the partial discharge state in the SF6 tap switch chamber is monitored, the partial discharge type and the discharge grade are identified, the early stage of partial discharge can be monitored in time, the stability of an insulating layer in the SF6 tap switch chamber is effectively protected, and the situation that a transformer is shut down due to the fact that the insulating layer is damaged is avoided.

Description

technical field [0001] The invention relates to the technical field of electric power information, in particular to a partial discharge monitoring system for an on-load tap changer of a transformer. Background technique [0002] With the rapid development of the national economy, the demand for electricity is constantly increasing. As an important part of the transformer, the on-load tap-changer plays a vital role in the safe and stable operation of the transformer. Partial discharge mainly refers to the non-penetrating discharge phenomenon in the electrodes of the insulating medium of high-voltage equipment under the action of high electric field strength, which leads to certain safety hazards. In the tap changer room, there may be problems with the processing technology, there may be burrs or protrusions on the mechanical structure of the switch, resulting in tip discharge, which may develop into spark discharge in the later stage, burning on the surface of the switch, and...

AI Technical Summary

Problems solved by technology

Partial discharge mainly refers to the non-penetrating discharge phenomenon in the electrodes of the insulating medium of high-voltage equipment under the action of high electric field strength, which leads to certain safety hazards

In the tap changer room, there may be problems with the processing technology, there may be burrs or protrusions on the mechanical structure of the switch, resulting in tip discharge, which may develop into spark discharge in the later stage, burning on the surface of the switch, and destroying the mechanical structure of the switch , affecting the switching performance

At present, popular physical partial discharge detection methods, such as pulse current method, photoelectric detection method, ultrasonic method and UHF method, have relatively high requirements on the electromagnetic interference on site, and cannot detect relatively weak partial discharge signals. signal, it is not easy to judge the PD type and PD level on site

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