H - Electricity – 02 – H
Patent
H - Electricity
02
H
322/0.5
H02H 7/06 (2006.01) H02J 3/24 (2006.01)
Patent
CA 1133582
22 48,379 ABSTRACT OF THE DISCLOSURE This concerns a compensator for electrical lines fed by a turbine-generator. The mechanical properties of the turbine-generator are such that modulation of the terminal voltage is possible due to subsynchronous mechan- ical torsional oscillations. If the carrier frequency or synchronous frequency of the generator minus the torsional oscillation frequency is equal to the resonant frequency of the electrical line driven thereby, a relatively large side band current may flow in the electrical line at the resonant frequency. The effect of this current may feed- back through the air gap of the generator to increase the torsional oscillation. A boot strapping effect between the electrical properties of the line and the torsional oscillation may thus result which could ultimately end in shaft breakage. The present apparatus utilizes the tor- sional oscillation signal to modulate compensating induct- ance connected in parallel between the lines of the elec- trical system to thus generate a small current at the appropriate electrical resonance frequency. This current leads to the production of a compensating line current at that frequency which in turn opposes the previously des- cribed undesirable effect.
353909
Putman Thomas H.
Ramey Donald G.
Mcconnell And Fox
Westinghouse Electric Corporation
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