PARTIAL DISCHARGE DETECTOR OF ELECTRIC MACHINERY

PURPOSE:To certainly and rapidly detect the partial discharge generated in winding by simple constitution. CONSTITUTION:In a partial discharge detector, light generated by partial discharge is guided to a photodetector through an optical fiber 2 and a light signal is converted to an electric signal by the photodetector to output an abnormality signal. The discharge detection sensor part 1 provided at the tip of the optical fiber 2 consists of a core 11 having a light emitting element 16 emitting light by the light generated by partial discharge provided on the surface or interior thereof and a sheath 12 formed from a transparent substance having a refractive index higher than that of the core 11. The discharge detection sensor part is pref. provided in the vicinity of the winding of electric machinery. As the light emitting element of the discharge detection sensor part, light emitting element 16 can be also used.