Assessment the energy capability of surge arresters in substation 220 kV

Lightning overvoltages are one of the most often reasons for faults in power system. In order to limit these types of overvoltages application of surge arresters is the best approach. With the use of metal-oxide surge arresters lightning performance of overhead line and substations is greatly improved. To secure their operation life without faults they have to be studied in every aspect. One of these aspects is the energy discharge capability of the arresters. This paper presents analysis of the energy stress on surge arresters in substation 220 kV through model study in ATP-EMTP software. Simulations are performed for direct lightning strike to a phase conductor and lightning strike to first tower near the substation. Several cases are investigated. Results from the model study could be useful for more economical selection of surge arresters and optimization processes in power system 220 kV. Also the developed model can be used in wave studies in substations.