Table 1: Key data of motor generators in Goldisthal Synchronous Motor-Generators Variable Speed Motor-Generators Output (MVA) 331 340 Max. Active Power (MW) 261 300 Rated Voltage (kV) 18.0 18.0 Rated Speed (rpm) 333 300.346 Runaway Speed (rpm) 535 535 Mass of Rotor (t) 433 493