Optical fiber detection device for detecting discharge fault of high-voltage bushing

An optical fiber detection device for detecting a discharge fault of a high-voltage bushing, comprising:

• an optical fiber sensing unit, an optical fiber delay unit, a photoelectric conversion unit, a signal collecting and processing unit, and a reflection structure, wherein
• the optical fiber sensing unit comprises a sensing optical fiber for winding around a high-voltage bushing;
• the optical fiber delay unit comprises a delay optical fiber, a light source, a light-splitting coupler having a first interface and a second interface, and a light-combining coupler having a third interface and a fourth interface;
• the photoelectric conversion unit comprises a photodetector;
• the signal collecting and processing unit comprises a high-pass filter for reducing low-frequency background noise and eliminating DC offset;
• the reflection structure is for reflecting an optical signal conducted in the sensing optical fiber;
• the reflection structure, the optical fiber sensing unit, the light combining coupler, the delay optical fiber, the light-splitting coupler, the photoelectric conversion unit, and the signal collecting and processing unit are directly connected to each other in serial, wherein one end of the delay optical fiber is connected to the third interface of the light-combining coupler, and the other end of the delay optical fiber is connected to the first interface of the light-splitting coupler;
• the second interface of the light-splitting coupler is connected to the fourth interface of the light-combining coupler;
• an output end of the light source is directly connected to the light-splitting coupler;
• wherein the optical fiber detection device comprises a light path consisting of the reflection structure, the optical fiber sensing unit, the light combining coupler, the delay optical fiber, the light-splitting coupler and the light source.