Field Test and Analysis of Partial Discharge on GIS Under Impulse Voltage

It is shown that many GIS devices still have insulating faults even after they have passed partial discharge test under power frequency voltage.Hence,it is necessary to experimentally study the partial discharge on GIS under impulse voltage so as to timely identify internal incipient faults and to insure stable and safe operations of equipment.We designed a set of partial discharge detection devices which could be conveniently applied in the field experiment considering the conditions of impulse voltage experiment on the basis of investigating the necessity of partial discharge of GIS under impulse voltage,and applied the device in partial discharge detection on several 800 kV breakers and GIS devices of 750 kV substation.Moreover,we discussed anti-interference measures in field experiment.The results indicate that the test device is effective.