Research On Lightning Protection For The Low Voltage System Of Substations

With the development of modem technology,more electronic and microelectronic devices are used in the power system substations.Anti-interference ability of these components significantly reduced than in the past electromagnetic devices.Specifically,it has a more obvious sensitivity and vulnerability to Lightning Transient interference.In this paper,the way of lightning invasive to the secondary system of substation is systematically analyzed.Follow the ways,Studied power system lightning protection program, and effectively solved the mine substation power system problem.Discussed the Weak system of equipotent grounding,Analyzed used the ATP-EMTP.Then analyzed the lightning current distribution in the grounding-line and the impact of the current in the grounding-line to the secondary cable.Through laboratory testing demonstrated the correctness of theoretical calculations.At last,discussed the shielded cable termination to the different ways to inhibit the effects of potential interference.