Conventional on-line detection methods of partial discharge are interfered by surroundings

therefore some simulation models of typical partial discharge in transformers are constructed in laboratory

and the models are measured by both UHF narrowband and UHF wideband detection systems.The measurements indicate that for the UHF narrowband detection technique

the central frequency and the bandwidth of the measured signal are adjustable

so optimum central frequency and bandwidth can be selected to avoid interferences;and the UHF wideband detection technique can detect much partial discharge information due to its wider frequency band.