engleski

Specific aspects of overvoltage protection in hydro power plant considering AIS and GIS connection to the transmission network

Overvoltage protection of substations connecting hydro power plants (HPP) to the transmission network depends on numerous factors such as: type of HPP connection (air-insulated substation AIS or gas insulated substation GIS), overhead line/cable connection, location, and characteristics of installed equipment, specific operating conditions, and topology. This paper deals with analysis of overvoltage protection in the underground located HPP considering AIS and GIS connection to 220 kV transmission network with specific emphasis on lightning overvoltages. Detailed model for analysis of lightning overvoltages was developed, and simulations are carried out to determine optimum overvoltage protection configuration. Due to specific topology of HPP connection and underground location of step-up transformer, it is necessary to determine the level of transferred overvoltages over transformer to check the necessity for installing additional surge arresters for protection of generator.

Overvoltage protection ; Hydro power plant ; GIS and AIS connection ; Lightning overvoltages ; EMTP

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