SYSTEM FOR DETECTING PARTIAL DISCHARGE DIRECTION OF COMPOUND-EYE-TYPE OPTICAL FIBER EFPI

摘要

A system for detecting the partial discharge direction of a compound-eye-type optical fiber EFPI, which relates to the technical field of online monitoring of partial discharge of an electric power paper oil insulation electrical apparatus. In the system, a narrow-band optical source (1), an optical filter (2) and an optical splitter (3) are sequentially connected; an optical circulator (4), a single mode optical fiber (5) and an optical fiber external-cavity-type Fabry-Perot sensing head (6) of each of five optical paths obtained through splitting are sequentially connected; each optical circulator (4) is further connected to a photoelectric detector (7) and an amplifier (8); and the amplifiers (8) are connected to an oscilloscope (9). Power is supplied, so that all the devices are in the working state; a compound-eye-type optical fiber external-cavity-type Fabry-Perot sensor (10) is placed at the top end of an insulation rod, and the insulation rod is rotated till the partial discharge pulse amplitude of the optical fiber external-cavity-type Fabry-Perot sensing head (6) located in the middle is the largest while the partial discharge pulse amplitudes of the other four optical fiber external-cavity-type Fabry-Perot sensing heads (6) are roughly equal; and thus the orientation of the optical fiber external-cavity-type Fabry-Perot sensing head (6) located in the middle is the direction of the partial discharge point. The detecting system has high sensitivity, good directivity and high anti-interference capacity, and can be used for conveniently and accurately locating the partial discharge direction of key portions of an electrical apparatus.