It is very hard to locate the breakdown spot after the flashover occurs in the gas insulated switchgear during the high voltage test. This paper summarizes the breakdown location methods for GIS

and gives an introduction of an GIS wireless breakdown positioning system based on the ultrasonic detection method

which has many advantages

such as good positioning effect

safety

good anti-interference performance

stable wireless communications

and so on. Through field application

many breakdown failure was accurately positioned internal GIS equipment.