Simulation Research of 220kV Substation Lightning Intruding Waves
Lightning intruding waves in 220 kV lines often damage the transformer equipment.In this paper,ATPEMTP simulation software is applied for the simulation analysis of 220 kV substation lightning incoming overvoltage.Simulation results show that lightning overvoltage will endanger the equipment safety in the case of improper operation mode,lightning protection loss of the bus device,and the over-distance lightning protection.Due to the defective circuit design,strong lightning in the nearby field may cause dangerous overvoltage.It is analyzed that overvoltage level is seriously affected by the line end parameters,bus operation mode,station equipment layout,and near-field lightning intensity.Supposedly,effective measures can be employed to prevent and control substation lightning incoming overvohage,such as optimizing end circuit design,reducing tower grounding resistance,adjusting the substation equipment layout,controling bus operation mode,as well as installing in the line-side zinc oxide arrester.
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