Method and apparatus for the protection of a thyristor power con

Details Method and apparatus for the protection of a thyristor power con Method and apparatus for the protection of a thyristor power con

1985-01-07

1986-05-13

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 92, 363 54, 363 57, H02H 326

Patent

active

045890501

ABSTRACT:
Each of the three phase power source voltages coupled to a three phase (3.0.) thyristor power converter are respectively half-wave rectified to provide both positive and negative voltages. Signals representing the largest positive rectified voltage and the smallest positive rectified voltage are developed as are signals representing the largest negative rectified voltage and the smallest negative rectified voltage. Using signals from both the positive and negative rectified voltages, at least one comparison is made to determine a difference which, when in excess of a predetermined limit, effects a logic signal to provide an indication that an asymmetrical fault exists either phase to neutral or phase to phase across the power converter and the power lines connecting the converter to a polyphase alternating current (AC) source. Following a suitable delay, protective action is initiated, which action comprises either phasing back of gating to the converter thyristors and/or tripping of a circuit breaker or contactor which operates to interrupt the supply of AC power to the converter.

REFERENCES:
patent: 3383522 (1965-08-01), Apfelbeck et al.
patent: 4084205 (1978-04-01), Bohnert
patent: 4218728 (1980-08-01), Chambers et al.

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