Method for switching in a three-phase high voltage circuit
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United States of America Patent
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Dec 9, 1986
Issued Date -
N/A
app pub date -
Mar 11, 1982
filing date -
Dec 14, 1977
priority date (Note) -
Expired
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Abstract
A method for interrupting an inductive load in a three-phase, high voltage network by means of a switch having a quick dielectric recovery, in particular a vacuum switch, in which two of the three vacuum switches, having a quick dielectric recovery, open at least 1/3 of a cycle of the network frequency later than the first vacuum switch, augmented with the minimum arcing time in the first vacuum switch, in order to prevent high over-voltages, caused by virtual chopping.
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