A PVDF-Based Ultrasonic and UHF Sensing Technology for PD Detection of GIS Equipment

At present, it is common to use external ultrasonic sensor and built-in UHF sensor to detect the partial discharge signal in GIS. The defects of this technology are the single function of the sensor, the low accuracy of the local discharge detection, and the sensor cannot fit the GIS equipment shell well. Based on the principle of partial discharge, an external ultrasound-UHF integrated sensor based on polyvinylidene fluoride (PVDF) is designed, which can simultaneously receive and output ultrasonic and UHF signals generated by partial discharge. The optimal parameters of the integrated sensor were obtained from simulations, which were proved to satisfy the national standard. The research in this paper effectively solves the problem that the two signals cannot be output simultaneously when the two kinds of sensors are installed separately, realizes the simple and reliable judgment of the location of the partial discharge.