CALCULATION OF FAST FRONT OVERVOLTAGES IN VICINITY OF A POWER TRANSFORMER

During their lifespan all the primary equipment installed in power system is subjected to transients. Therefore, it necessary adequately dimension and protect equipment. However, networks with high share of renewables, electronics, cables or near GIS, failure can occur even though good practice insulation coordination are fulfilled.
 In this paper frequency transformer model presented. Such based on measurements admittance matrix adequate for simulation fast front transient EMTP like software. Additionally, simulations lightning switching overvoltages given observed unit.