A METHOD OF PROTECTING A THRISTOR SWITCH FROM AN IMPULSE GENERATOR FOR ELECTROSTATIC PRECIPITATOR AGAINST OVERLOADS.

摘要

To protect a thyristor switch in a pulse generator for an electrostatic precipitator it is desirable to control the spark-over rate in the precipitator. A first spark-over starts a measurement of the difference between the number of spark-overs and the number of times a pre-selected cooling period (pk) has passed after the first spark-over and the measurement is stopped when the difference becomes 0. The measurement is started again the next time a spark-over occurs and one or more relevant running parameters of the precipitator are influenced in such a way as to diminish the probability of a further spark-over when the difference exceeds a given value.