Local discharging sensor combining graphene diaphragm with micro optical fiber interference cavity and detection method based thereon

Abstract

The invention discloses a local discharging sensor combining a graphene diaphragm with a micro optical fiber interference cavity and a detection method based thereon. The local discharging sensor comprises a tunable laser device (1), a laser device wavelength control module (2), an optical fiber circulator (3), monomode optical fiber (4), the micro optical fiber interference cavity (5), a photoelectric detector (6), a signal line (7), a filter (8) and a data collection card (9). A multilayer graphene membrane is adopted, so that detection sensitivity of the sensor is improved; on the basis ofstructure optimization design of the multilayer graphene membrane, the multilayer graphene membrane is enabled to adapt to local discharging detection frequency band requirements; a polyimide coatingis adopted to prolong service life of the multilayer graphene membrane; femtosecond laser is adopted to process the micro optical fiber interference cavity inside optical fiber, and a static-state working point is stabilized on the basis of laser device wavelength control. On the basis of optimization design of a detection device mounting mode, original working environment of electrical equipmentis unaffected during mounting of the local discharging sensor.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of electrical equipment, and in particular relates to a partial discharge sensor and a partial discharge detection method combining a graphene diaphragm and a micro-fiber interference cavity. Background technique [0002] Partial discharge is a discharge phenomenon caused by the breakdown of a local area in an insulating medium. Partial discharge detection is an effective method for evaluating the insulation state of electrical equipment. When partial discharge occurs in the medium, electric pulses, electromagnetic waves, ultrasonic waves, light, local overheating and some new chemical products will be generated. By detecting the ultrasonic signal generated by partial discharge, the existence of partial discharge can be determined and the discharge point can be located. Compared with the traditional piezoelectric sensor, the partial discharge sensor based on optical fiber sensing has t...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a partial discharge sensor combined with a graphene diaphragm and a micro-fiber interference cavity and a detection method based on it, aiming to solve the low detection sensitivity and susceptibility of the current fiber-optic Perth type partial discharge sensor. Disadvantages of temperature effects

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