Combined electric appliance electrified detection system based on ultrasound and oscilloscope technology

Abstract

The invention relates to a combined electric appliance electrified detection system based on an ultrasound and oscilloscope technology. The system is characterized by comprising an ultrasound detection unit, an ultrasound partial discharge detector and a high-speed oscilloscope. The ultrasound detection unit is installed on a combined electric appliance and used for detecting the ultrasound signal of the combined electric appliance and transmitting a detection result to the ultrasound partial discharge detector, and the partial discharge detector performs partial discharge signal detection. The output end of the ultrasound partial discharge detector is connected with the high-speed oscilloscope used for performing time domain analysis on the partial discharge signal, and then the combined electric appliance is detected in an electrified mode. Ultrasound measurement and analysis of the time domain spectrum of data collected by the ultrasound detection unit are synchronously performed, in this way, an external interference signal can be effectively distinguished from the partial discharge signal, the functions of judging and positioning the partial discharge signal are achieved, the accuracy of electrified detection on the combined electric appliance is improved, and safe and stable operation of the combined electric appliance is guaranteed. The combined electric appliance electrified detection system has the advantages of being high in sensitivity, accurate, reliable, convenient to use and the like.

Description

technical field [0001] The invention belongs to the technical field of power grid combined electrical appliances, in particular to a live detection system of combined electrical appliances based on ultrasonic and oscilloscope technology. Background technique [0002] Gas-insulated switchgear (GIS) has many advantages such as maintenance-free and space-saving, and has been widely used in power grids. However, in recent years, accidents of combined electrical appliances have occurred frequently, especially the surface discharge defects of basin insulators inside combined electrical appliances are particularly prominent. It can be seen from the high-voltage theory that the breakdown voltage of creeping discharge or even flashover is much lower than the breakdown voltage of sulfur hexafluoride gas. The pot insulator is the place with the worst internal insulation performance of the combined electrical appliance. At present, ultrasonic testing methods or The ultra-high frequency...

AI Technical Summary

Problems solved by technology

However, in recent years, accidents of combined electrical appliances have occurred frequently, especially the surface discharge defect of the pot insulator inside the combined electrical appliance is particularly prominent

It can be seen from the high-voltage theory that the breakdown voltage of creeping discharge or even flashover is much lower than the breakdown voltage of sulfur hexafluoride gas. The pot insulator is the place with the worst internal insulation performance of the combined electrical appliance. At present, ultrasonic testing methods or The ultra-high frequency detection method carries out live detection on combined electrical appliances. The above live detection technology is mainly used to detect whether partial discharge occurs in the equipment, and cannot effectively judge the interference signal and partial discharge signal during detection, which will have a certain impact on accurate detection. Therefore, its The detection accuracy is low, and it is difficult to find various partial discharge defects inside the combined electrical appliance

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