Transformer Partial Discharge Detection System Based on Optical Fiber External Cavity FAP Sensor Array

Abstract

The invention discloses a transformer partial discharge detection system of an optical fiber external cavity FAP sensor array, which belongs to the technical field of on-line partial discharge monitoring of power transformer equipment. The partial discharge detection system consists of narrow-band light sources, optical filters, optical splitters, 4 optical circulators, 4 single-mode optical fibers, 4 optical fiber external cavity FAP sensors, and 4 photodetectors, 4 amplifiers and The oscilloscope is composed of two optical fiber external cavity FAP sensors placed in the temperature measuring tank oil on the top of the transformer, and the other two placed in the flange grooves on both sides of the transformer top. The groove structure is equivalent to the ultrasonic signal collector. It is used to remove the angle response, enhance the signal and avoid the influence of the oil pressure inside the transformer. The invention has high sensitivity, strong signal collection ability, convenient operation and strong anti-interference ability; it can also well detect the partial discharge of the transformer without additional auxiliary structures. The optical fiber external cavity FAP sensor has high sensitivity and can detect weak partial discharge signals.

Description

Technical field [0001] The invention belongs to the technical field of partial discharge online monitoring of power transformer equipment, and particularly relates to a transformer partial discharge detection system of an optical fiber external cavity type Fabry Perot sensor array. Background technique [0002] At present, there are many methods for online monitoring of partial discharge of transformers at home and abroad, mainly including VHF pulse current detection method, ultra-high frequency (UHF) electromagnetic wave detection method and piezoelectric sensor ultrasonic detection method, including VHF and UHF detection methods. The electric signal is easily interfered by electromagnetic interference signals; the piezoelectric ultrasonic method detects ultrasonic signals, but the sensor is attached to the equipment shell, which detects the ultrasonic signals generated by the partial discharge inside the equipment, although it is not susceptible to electromagnetic noise Interfe...

AI Technical Summary

Problems solved by technology

The domestically researched fiber optic external-cavity FAP sensor is mainly used for the measurement of slow variables such as temperature, strain, and pressure, and is not suitable for the detection of high-frequency and rapid partial discharge.

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