Transformer partial discharge monitoring and positioning system and method adopting multiple composite sensors

Abstract

The invention relates to a transformer partial discharge monitoring and positioning system and method adopting multiple composite sensors. The system comprises a piezoelectric AE sensor and UHF electromagnetic wave sensor integrated composite sensor, a multi-channel pilot frequency data synchronous acquisition device, a transmission network, a data server, an application server and a user terminal. The composite sensor is connected with the transmission network through the multi-channel pilot frequency data synchronous acquisition device, and the transmission network is respectively connectedwith the data server, the application server and the user terminal. Compared with the prior art, the problem that whether PD signals come from the interior of a transformer or not is judged only through a single-property signal source at present is solved.

Description

technical field [0001] The invention relates to a transformer partial discharge monitoring and positioning system and method, in particular to a transformer partial discharge monitoring and positioning system and method using multiple composite sensors. Background technique [0002] There are defects in transformer oil-paper insulation, and when partial discharge (Partial dishcarge, PD) occurs, electric pulses, electromagnetic radiation, ultrasonic waves, light, and some new products are generated, and physical and chemical reactions such as local overheating are caused. Therefore, in principle, if these phenomena can be detected, they can be used as indications of PD defects. The transformer positioning methods under the applied voltage that have been developed include electrical positioning, ultrasonic (AE) positioning, electromagnetic wave high frequency (UHF) positioning, optical positioning and thermal positioning. In addition to the applied voltage, if the PD is also ...

AI Technical Summary

Problems solved by technology

This monitoring system and its method use an external AE sensor: when the transformer is actually operating, there are external signal interference from the substation, AE signal attenuation caused by the transformer equipment casing, and the AE signal is in the transformer equipment material (insulating oil, steel plate, etc.) problems such as transmission multipath caused by different medium acoustic impedance, see figure 2 , so there are disadvantages such as poor anti-interference of the system, inability to work under weak discharge conditions, large deviation between PD source positioning and actual position, etc.

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