Abstract
A system for the location of sparks within an electrostatic precipitator can be used diagnostically to enable rapid identification of electrically weak spots due to wire or plate misalignments, design features or local defects in construction (e.g. sharp edges in regions of high electric stress). It can help to improve plant availability by the rapid location of faults due to broken wires while the unit is on-load, and so shorten the time for repair. Spark location is determined by measuring the transit time of an acoustic wave from a spark to microphones placed around each electrical zone. The bending of the sound paths around the plate edges is included in the analysis technique. The technique has been tested on a precipitator zone at a power station for both off-load and on-load operations. During on-load use the system can locate sparks to an accuracy of ±3 lanes and ±3 wires.
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