Online monitoring technology is the real-time monitoring and fault pre-diagnosis of effective GIS technology, the time delay method is a major means of fixing the GIS partial discharge, which is based on the waveform feature points of time delay calculation method has been widely applied in the practical engineering, this paper to improve the signal waveform characteristic point, puts forward the feature points is replaced by a rising edge delay calculation method, through together based on uhf partial discharge phenomena found in the on-line monitoring system, the signal waveform feature points and rising along the method has carried on the comparative study. The research shows that compared with the signal waveform characteristic point method, the rising edge method not only improves the positioning accuracy, but also inherits the advantages of simple operation and low cost of signal waveform characteristic point method, which has certain engineering application value.

GIS;High frequency;Partial discharge;Time difference positioning;On-line monitoring