Fast-acting spark-over detector

Details Fast-acting spark-over detector Fast-acting spark-over detector

1984-11-02

1987-02-17

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 94, 361100, 361235, 323903, H02H 3093

Patent

active

046444394

ABSTRACT:
A spark-over detector for an electrostatic precipitator has a current sensor (3) which provides a signal (a) which is differentiated twice to produce a signal (c). If the level of the signal (c) is above a predetermined level then a level-detecting circuit (7) passes a signal (d) to an AND-gate (8). A second level detecting circuit (9) receives the signal (a) and if this signal is above a predetermined level passes the signal (e) to a timing circuit (10) which provides a signal (f) from a first preset time after having received the signal (e) until a second preset time after the signal (e) has ceased. Thus, if a spark over starts to occur signals (d) and (f) occur simultaneously and the AND-gate produces an output signal (g) which can be used to trigger the thyristor switch circuit of the pulse generator to conduction to prevent thyristor damage or destruction.

REFERENCES:
patent: 3865438 (1975-02-01), Boksjo et al.
patent: 3974436 (1976-10-01), Timpe
patent: 4084206 (1978-04-01), Leowald et al.
patent: 4503477 (1985-03-01), Henriksen et al.
patent: 4536816 (1985-08-01), Matsumura et al.

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