Model study of lightning protection of 110 kV substation

The high-voltage switchgears are frequently exposed to lightning strokes. The arising overvoltage in some cases can exceed the insulation level of the power equipment. A commonly used lightning protection devices are the metal-oxide surge arresters. This paper presents a developed simulation model, appropriate for assessment of the impact of lightning strokes on the insulation of the switchyard equipment. An example 110 kV substation is used for test case. The study illustrates the effect of MOSA´s operation in terms of limiting the arising overvoltage. The proposed simulation methodology can be used to make a precise choice of surge protection of high-voltage switchgears.