Apparatus for reducing subsynchronous frequencies in a power sup

Details Apparatus for reducing subsynchronous frequencies in a power sup Apparatus for reducing subsynchronous frequencies in a power sup

1981-03-09

1985-11-05

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With tuned circuit

361 20, 361 54, 363 39, 333175, 333176, H02H 706

Patent

active

045517800

ABSTRACT:
A protective circuit for reducing subsynchronous natural resonant frequency signals in a multiphase power supply system includes a damping resistor connected in series with each phase winding of the system. A resonant circuit tuned to the rated line frequency of the system is connected in parallel with each resistor so that signals having frequencies other than the rated line frequency will be damped by the resistors. An inductor can also be placed in parallel with each resistor to maximize the damping effect of each resistor at predetermined subsynchronous frequencies.

REFERENCES:
patent: 1255387 (1918-02-01), Chubb
patent: 3501686 (1970-03-01), Tveteras et al.
patent: 3555291 (1971-01-01), Dewey
patent: 3813593 (1974-05-01), Tice et al.
patent: 3881137 (1975-04-01), Thanawala
patent: 3944846 (1976-03-01), Thompson et al.

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