Abstract

The spark gap is a surge protective device which consists of two electrodes in open air in parallel to the protected insulation. Spark gaps are usually applied at gantry tower of substation and it can also be applied at several transmission poles in front of the substation. Sparks gaps are defined by the current internal EMS standard and the IEC standard from 1996, but are excluded from the current IEC standard adopted in 2018. Analyze of protective spark gaps at gantry tower of the 110 kV substation impact to the expected time between failures of the most sensitive equipment due to lightning overvoltages. The analysis of spark gap application influence to the risk of failure is performed for an open-air substation and a SF6 gas isolated substation.

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