Ultra-high frequency（UHF）detection has been widely used in gas insulated substation（GIS）because it can effectively avoid on-site noise interference

however

there is not a calibration method specifically targetingUHF detection device for different frequency bands. In this paper

a GIS partial discharge calibration platform is de-signed

which consists of partial discharge analog pulse signal source

coaxial impedance transition section

coaxialsignal calibration section

coaxial impedance matching section

high speed oscilloscope and UHF sensor. Amongthem

the 3-channel partial discharge analog pulse signal source can output pulse waveforms with rising edges of 240 ps

460 ps and 1 ns

respectively

to simulate the ultra-high frequency signals with different frequency bands

which aregenerated by different defect types such as spike

suspended particle

and bubble in insulator. The coaxial imped-ance transition section is used to connect the SMA interface with the 550 kV true GIS

greatly reducing the signal dis-tortion

and its transmission performance of the UHF signal is much better than that of the ordinary tapered transition section. The system test is completed

verifying the system can be used for UHF sensor calibration.