Abstract: In this paper experimentally determined temporary overvoltages in the electrical power system of Yugoslavia due to: earth faults, load droppings, performances with incomplete phases, Ferranti effects, switching-in unloaded transformers, energizations of overhead lines terminated with unloaded transformers and another switching operations are considered.
On the basis of their analysis, the measures and the means for their reduction and prevention are given.
Keywords: Temporary overvoltage, earth fault, overhead line, transformer.