Optical Fiber Distributed Partial Discharge Detection System

Abstract

The invention proposes an optical fiber distributed partial discharge detection system, including an optical fiber sensing system based on Michelson interference, a fast optical switch, an optical switch controller, a mandrel-type optical fiber sensing unit, an insulator-wrapped optical fiber sensing unit, a fast optical One input port of the switch corresponds to multiple output ports. The optical fiber sensing system based on Michelson interference performs time-division multiplexing on multiple optical fiber sensing units through fast optical switches to realize distributed sensing measurement; the optical switch controller controls each of the optical switches. The output port is automatically cycle switched. The system of the present invention realizes time-division multiplexing through the optical path switching system, enables the distributed sensing capability of the sensing system to realize partial discharge fault location of multiple GIS insulators at the same time, and proposes the setting principle of the optical fiber sensing unit to solve the problem Directionality issues for distributed localization of partial discharges in GIS.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to an optical fiber distributed partial discharge detection system. Background technique [0002] Gas Insulated Switchgear (GIS) has become the mainstream equipment in high-voltage power systems due to its compact structure, not easily affected by the external environment, strong scalability, high operational reliability, and convenient maintenance. However, insulation defects inevitably appear in the actual production, transportation, and operation processes, which affect its long-term reliability. According to statistics, the proportion of GIS faults caused by the reduction of insulation level is very large. Partial discharge is an important characterization form of insulation fault, so it is of great significance to effectively detect partial discharge in GIS. [0003] According to the different physical quantities generated by partial discharge, the detection methods of pa...

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Problems solved by technology

[0005] In order to solve the complex propagation of partial discharge ultrasonic signals in GIS, it is difficult to achieve effective early warning with a single sensor, and it is impossible to realize the technical problems of distributed positioning sensing for ultrasonic signal detection at multiple locations in one system and the directional problem of distributed detection of partial discharge in GIS. The invention proposes an optical fiber distributed partial discharge detection system

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