GIS internal discharge test detection system

The utility model relates to a GIS internal discharge test detection system, which is installed inside a GIS. The system comprises a test high-voltage loop and a partial discharge detection assembly. Specifically, the test high-voltage loop includes a step-up transformer, a water resistor, a coupling capacitance voltage divider, a pulse current detection resistor and a tip plate electrode; and the partial discharge detection assembly consists of an ultrahigh frequency broadband sensor, an ultrasonic transducer, a pulse current partial discharge detection instrument, a high-speed digital oscilloscope, an ultrasonic partial discharge detection instrument and a frequency analyzer. Compared with the prior art, the technology employed in the utility model enables the detection system to have advantages of security and reliability as well as synchronized observation of different signals and the like.