The Simulation Analysis And Experiment Research Of Ice Flashover Of Ground Wire Insulator With Parallel-Gap

The lightning and line icing have long been the key technology and research focus in the field of electricity,as it could affect the safety and stability of the power system operation seriously.The parallel gap device could strengthen the protection of the lightning shield line,and reduce the rate of lightning trip.Also,the device could produce steady direct-current circuit thus to protect the ground insulator from changing voltage as ice start to melt.This research is set out to study the basic requirements of safe ice-melting of ground electrode with direct-current,and the impact the melting ice of different components could have on the flashover voltage.A simulation is made on the ice-covered ground insulator with parallel-gap device.Also the simulation evidenced the relationship between the flashover voltage and the gap length of parallel-gapped insulator,and its’ reaction along with the changing of the overlying ice conductivity.The research is written in the hope to give certain theoretical guidance on the practical use of parallel-gapped insulator in the situation of ground electrode being ice-covered.Infinite outside boundary is set up based on the finite element method to make sure the simulation is placed in the air.Thus the two-dimensional and three-dimensional model of ice-covered parallel-gapped insulator is established.The RCSE100C-2 composite insulators are taken as the object in this test which is made in the artificial climate chamber with temperature,rainfall volume,wind speed and other environmental parameters under control,and studied how the gap length,overlying ice conductivity and status of ice could affect the flashover voltage.Experimental data is analyzed with conclusion come as below.As the ice begin to melting after one-hour freezing,the flashover voltage grows along with the gap length but fall down if the overlying ice conductivity continually grows when every other variable under control.Also the flashover voltage will decrease if the overlying ice melted.