An optical fiber partial discharge detection system

A technology of partial discharge detection and photodetector, which is applied in the direction of testing dielectric strength, etc., can solve the problems of low test frequency, low precision, and low strength of electromagnetic pulse signals, and achieve small discharge volume and positioning error, high recognition rate and Accuracy, multiplexing and convenient effects
CN104297642BActive Publication Date: 2017-08-29BEIJING INST OF AEROSPACE CONTROL DEVICES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING INST OF AEROSPACE CONTROL DEVICES
Publication Date
2017-08-29

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Abstract

A partial optical fiber discharge detecting system comprises a light source, an acoustic-optic modulation device, a sensing light path and a demodulating system. Frequency shifting and delaying are carried out on light emitted by the light source through the acoustic-optic modulation device, and only two paths of light with the same optical path can interfere in the sensing light path and a reference light path. When partial discharge signals occur outside, the generated sound waves act on the sensing light path, the phase position of the interference signals changes, and the related information (intensity, position and the like) of outside partial discharge signals can be obtained by demodulating the variable quantity. Compared with traditional electromagnetic sensing and piezoelectric sensing, optical fiber sensing is insulated from electromagnetism essentially, the sensing optical fiber can be arranged in insulating oil of a transformer, the sensitivity for detecting the partial discharge signals is further improved, multiplexing can be formed easily, and the partial discharge signals can be precisely positioned.
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Description

technical field

[0001] The invention belongs to the field of power system automation, in particular to an optical fiber partial discharge detection system. Background technique

[0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher. Electrical equipment is the basic component of the power system. Once an accident occurs, it will not only affect adjacent equipment, but also cause heavy economic losses to users. Large-scale electrical equipment mostly uses various organic synthetic insulating materials such as mineral oil, insulating paper or epoxy resin to form a composite structure. A large number of data show that insulation failure is the main cause of electrical equipment failure.

[0003] Partial discharge is not only the main cause of insulation failure, but also an important symptom and manifestation of insulation degradation, which is closely related to the degradation and b...

Claims

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