Method and arrangement for protecting turbine generators against

Details Method and arrangement for protecting turbine generators against Method and arrangement for protecting turbine generators against

1988-03-28

1989-06-27

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Generator protective circuits

361 58, 361113, 361107, 307102, 307105, 322 58, H02H 706

Patent

active

048435139

ABSTRACT:
A method by which a turbine generator (1, 2, 3) can be protected against sub-synchronous frequencies occurring in an electric network which is connected to the turbine generator and which incorporates capacitors. The method is based on de-equalizing the subsynchronous natural frequencies of the three phases, so as to weaken the coherence of the frequencies. This is achieved by incorporating in each of two of the phases a respective inductance L of mutually different size and by changing the capacitance equivalently with a series capacitance C such as to fulfill the condition 1/LC=.omega..sub.o.sup.2, where .omega..sub.o is the network frequency.

REFERENCES:
patent: 3745416 (1973-07-01), Thanawala
patent: 3813593 (1974-05-01), Tice et al.
patent: 3881137 (1975-04-01), Thanawala
patent: 4158864 (1979-06-01), Kennon
patent: 4355241 (1982-10-01), Hingorani
patent: 4434376 (1984-02-01), Hingorani
patent: 4551780 (1985-11-01), Canay
patent: 4724333 (1988-02-01), Hedin

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