Composite insulator surface discharge real-time detection system and method

The invention discloses a composite insulator surface discharge real-time detection system and method. The system comprises a test power supply, an optical fiber composite insulator, a grating demodulator, a camera and a computer. The optical fiber composite insulator is provided with optical fibers, and each optical fiber is provided with a grating used for tracking the change process of the internal temperature in the surface discharge process of the composite insulator. The method comprises the following steps: acquiring the wavelength offset of the fiber Bragg grating in the surface discharge process of the composite insulator, calculating the internal temperature rise of the composite insulator caused by surface discharge according to the relationship between the wavelength offset and the temperature change, and finally calculating the internal temperature rise of the composite insulator according to the temperature change measured by the gratings at different positions. And judging whether local electri