Design and application of loop antenna for partial discharge induced electromagnetic wave detection

Power apparatus is generally in the form of metal enclosed equipment. The released energy from PD such as light, heat, and EM wave is disable to pass through metal enclosure, so it must be detected by the internal sensor. However, PD induced EM wave may leak from the dielectric window of power apparatus. EM wave may propagate through the dielectric window and detected by external sensor. The PD measurement by using external sensor has many advantages such as safe and easy in sensor installation. Therefore, the PD measurement system in metal enclosed equipment will be developed based on EM wave induced by PD detected by external sensor. First, the sensors which be able to detect PD induced EM wave in ultrawide band need to be designed and manufactured. Second, the characteristics of PD induced EM wave measured by the sensors need to be investigated. This paper deals with design and application of loop antenna for partial discharge (PD) induced electromagnetic (EM) wave detection in power apparatus. The loop antenna was designed to measure PD induced EM wave in power apparatus.