Process and arrangement for selective network monitoring for switchgear
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United States of America Patent
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-
Apr 16, 2002
Grant Date -
N/A
app pub date -
Feb 15, 2000
filing date -
Mar 26, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In switchgear with superordinate power circuit-breakers and a plurality of subordinate power circuit-breakers, the superordinate power circuit-breaker must be triggered in the event of failure of the subordinate power circuit-breakers. This is accomplished as follows: electrical post-arc currents are detected after current zero, the electrical post-arc currents are compared with a predetermined limit value, and if the limit value is exceeded, a signal is effected for triggering the superordinate power circuit-breaker in the switchgear. This method can advantageously be implemented in particular in the case of vacuum circuit-breakers with at least one vacuum interrupter. The associated arrangement has a device which monitors the subordinate power circuit-breakers and, if appropriate, triggers the superordinate power circuit-breaker.
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