Protecting apparatus for secondary excitation type variable spee

Details Protecting apparatus for secondary excitation type variable spee Protecting apparatus for secondary excitation type variable spee

1987-08-13

1989-03-14

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

With voltage source connected to motor secondary

318798, 318806, 361 33, 363 57, H02P 540

Patent

active

048127299

ABSTRACT:
There is disclosed a protecting apparatus for a secondary excitation type variable speed AC generator/motor having a primary winding connected to an electric power system and a secondary winding each phase of which is AC excited by an independent power converter unit. The protecting apparatus is arranged to detect an electrical event which includes at least one of an overvoltage and overcurrent appearing at each phase of the secondary winding of the AC generator/motor, to decide whether the detected electrical event meets a predetermined condition and to close, when the electrical event detected in respect to any of phases of the secondary winding is decided as meeting the predetermined condition, a switch circuit connected in the corresponding phase of the secondary winding.

REFERENCES:
patent: 3046412 (1962-07-01), Seike
patent: 3800198 (1974-03-01), Graf et al.
patent: 3852656 (1974-12-01), Bourbeau
patent: 3942092 (1976-03-01), Bourbeau et al.
patent: 4636929 (1987-01-01), Nakamura et al.

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