Forced commutation precipitator circuit

Details Forced commutation precipitator circuit Forced commutation precipitator circuit

1978-12-04

1980-12-09

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

55139, 361235, 363 24, B03C 368

Patent

active

042388104

ABSTRACT:
A control circuit for an electrical precipitator having a high voltage transformer with a bridge rectifier between the secondary of the transformer and the high voltage precipitator electrodes. The control circuit includes a pair of oppositely poled main thyristors in the primary circuit with a firing arrangement to trigger the main thyristors to maintain desired conditions at the electrodes. The primary circuit does not require a current limiting reactor to limit primary current when a spark discharge takes place at the electrodes. A pair of auxiliary thyristors are each connected in series with a capacitor. Each capacitor and the respective auxiliary thyristor form a branch and these two branches are each connected in parallel with the main thyristors. A rectifier is connected to keep the capacitors charged in opposing directions. When a spark discharge at the electrodes is detected, the firing circuit temporarily interrupts the firing pulses to the main thyristor which is conducting when the spark discharge occurs, and provides firing pulses to a respective auxiliary thyristor poled to conduct in the same direction. When the auxiliary thyristor is fired, the capacitor in series with it discharges through it and creates a voltage at the main thyristor which was conducting, and the voltage is such that the main thyristor switches to its non-conducting state before the end of the half cycle. The high primary current that could result with spark discharge is thus stopped before it reaches destructive levels.

REFERENCES:
patent: 3407314 (1968-10-01), Wolff
patent: 3622839 (1971-11-01), Abrams et al.
patent: 3877896 (1975-04-01), Muskovac
patent: 4051425 (1977-09-01), Smith

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