Device and method for positioning fault in transformer shell

Abstract

The invention provides a device and a method for positioning a fault in a transformer shell. The device comprises a refrigeration sheet, a thermoelectric power generation unit, a plurality of vibration sensors, and an ultrasonic wave transmission module. The refrigeration sheet is installed at the outer side of the shell of a transformer; the thermoelectric power generation unit is mounted on the inner side of the shell of the transformer and is opposite to the refrigeration sheet in position; the plurality of vibration sensors are installed in the transformer, the optimal arrangement scheme of the vibration sensors in insulating oil is determined according to a sensor optimal configuration model, and the vibration sensors are used for detecting and positioning the vibration condition in the transformer in a plurality of different directions in the insulating oil; the plurality of vibration sensors are connected with the thermoelectric power generation unit so as to be powered by the thermoelectric power generation unit; and the ultrasonic wave transmission module is used for sending the vibration condition and the positioning information in the transformer to a terminal outside the transformer. According to the invention, the positioning of a fault source is achieved, the fault measurement precision is higher, and richer information is reflected.

Description

technical field [0001] The application relates to the technical field of measurement equipment, and in particular, to a device and method for locating faults in a transformer casing. Background technique [0002] At present, most of the ultrasonic positioning methods of transformer vibration source proposed at home and abroad regard the transformer as a box filled with oil, and do not consider the influence of the inner structure of the transformer and the metal box wall on the propagation path and propagation speed of the ultrasonic signal. If only a fixed propagation speed is used To calculate the position of the PD source will seriously affect the positioning accuracy. In addition, when the ultrasonic signal propagates to the metal casing, due to the total reflection, when the incident angle exceeds the total reflection angle, the sensor will not be able to collect the partial discharge signal from the direct wave. In this case, the ultrasonic direct wave path is still us...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the ultrasonic localization methods for transformer vibration sources at home and abroad regard the transformer as a box filled with oil, without considering the influence of the transformer internal structure and the metal box wall on the propagation path and propagation velocity of the ultrasonic signal. If only a fixed propagation velocity is used To calculate the position of the PD source will seriously affect the positioning accuracy

In addition, when the ultrasonic signal propagates to the metal shell, due to the total reflection, when the incident angle exceeds the total reflection angle, the sensor will not be able to collect the partial discharge signal from the direct wave at this time, if the ultrasonic direct wave path is still used in this case If it is calculated, it will introduce a huge error, and it is difficult to accurately judge the location of the partial discharge source

Images