Variable speed generator-motor apparatus

Details Variable speed generator-motor apparatus Variable speed generator-motor apparatus

H - Electricity

02

P

318/105, 322/0.5

H02P 1/06 (2006.01) H02H 7/06 (2006.01) H02P 9/10 (2006.01)

Patent

CA 1289188

Abstract A generator-motor apparatus has economical protection measures for use in a variable speed pumping-up electric power plant. The apparatus comprises a main transformer, a secondary winding of which is coupled to an electric power system, a power system breaker connected to a primary winding of the main transformer, and a synchronizing breaker connected in series with the power system breaker. The generator-motor has a rotor mechanically coupled to a pump-turbine and an armature winding connected to the power system through the synchronizing breaker, the power system breaker and the main transformer. An excitation circuit, including a frequency converter, supplies a field winding of the generator-motor with an AC voltage of variable frequency. A converter transformer for feeding the converter is branched from a function of the power system breaker and the synchronizing breaker. The arrangement is such that the power system breaker does not need to have such a large current breaking capacity as the excitation breaker employed in prior art arrangements.

574627

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