The Analysis and Solution of Flashover Discharge on HVDC Filter Capacitor in Gezhouba Converter Station
DC filter HV capacitor flashover discharge happens frequently during the Gezhouba-Nanqiao HVDC system operation. The flashover phenomenon is introduced in this paper of three reasons (bad weather,dirt and insulation design) lead to this flashover discharge,especially the local dirt level increase and insufficient insulation capability of design are the main reasons. Then two solution methods are put forward to prevent this flashover discharge such as operation anti-flashover measures and design improvement. To solve this problem,the PRTV was painted on the insulation surface of DC filter HV capacitor in Gezhouba Station. After that,the flashover discharge disappears when in bad weather during operation. At the end of the paper,the conclusion is drawn out that PRTV painting can increase the capability of insulation equipment and prevent the flashover accident.