Effects of Grounding Resistance on Secondary Arc Current in Extra-High-Voltage Transmission Lines
Han Yanhua,Shi Wei
(School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

Abstract£ºEmpirical numerical value of grounding resistance is often used in secondary arc current calculation. The effects of grounding resistance on secondary arc current are analysed by use of the Thevenin theorem. The method of secondary arc extinction determines whether or not the grounding resistance needs to be modeled in detail. The grounding resistance has little effect on secondary arc current in transmission line with and without shunt compensation while it should be considered in detail (the secondary arc may need to be included) in transmission line where high speed grounding switches (HSGS) are used. It is also verified by the calculation of electromagnetic transient program (EMTP).
Keywords£ºsingle¡Mpole autoreclosure;grounding resistance;secondary arc current