Signal processing and transmission in GIS flashover fault location system

This paper introduces the detection principle of Gas-Insulated Switchgear(GIS) ultrasonic testing method for the fault location of flashover. We designed the GIS flashover fault location monitoring system, which solved the problem of low precision and time-consuming for the detection of GIS. We designed the hardware and software of the monitoring system. We use the three op amp differential amplifier circuit in front processing circuit of the hardware part to suppress the common mode signal in the signals. When the signal is processed by software, the method of wavelet soft and hard threshold is designed to remove the noise in the signal and improve the signal to noise ratio. We achieve the task of wireless data transmission through the ZigBee2007Pro protocol stack. Experimental platform is built to verify the reliability of the GIS flashover fault location system, which can improve the positioning accuracy and fault location, and has the advantages of low cost, portability and so on.