Back corona detection and current setback for electrostatic prec

Details Back corona detection and current setback for electrostatic prec Back corona detection and current setback for electrostatic prec

1981-10-15

1983-06-28

Shoop, William M.

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

55105, 323241, G05F 1455

Patent

active

043908306

ABSTRACT:
A back corona detector that reduces current flow to the plates of an electrostatic precipitator when a corona occurs between a plate and the dust layer that forms on the plate thereby minimizing the corona condition. The ramping voltage in a transformer/rectifier set under usual operating conditions will vary proportionally with current flow. At the onset of a back corona condition, a comparator senses a sudden increase in current with respect to the voltage indicating that the current is being consumed to maintain the corona rather than providing for particulate precipitation. A current set-back circuit is then pulsed periodically so that the current is continuously reduced until the voltage/current relationship is maintained at the knee of the voltage/current curve.

REFERENCES:
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patent: 3039252 (1962-06-01), Guldemond et al.
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patent: 4152124 (1979-05-01), Davis
patent: 4326245 (1982-04-01), Saleh
patent: 4326860 (1982-04-01), Laugesen

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