Probability assessment of power system accident caused by pollution flashover

The natural contamination deposited on the surface of insulators after a period of on-line operation. And under certain weather condition, flashover may occur on the surface of insulators. This paper analysed the process of pollution flashover and summarized the characteristics of the pollution flashover accidents. Then an early-warning defense platform for power system accidents caused by pollution flashover is developed. Non-electrical information, such as weather information and other external environmental information, is taken into consideration in this platform. A flashover probability assessment framework is given by combining the static information with the non-electrical information. The static information here means the line data, the insulator string data, etc. So the flashover probability can be calculated dynamically with the change of time, location and surroundings. The result can be used to amend fault list and provide initial fault set for power system safety and stability analysis.