G - Physics – 01 – R
Patent
G - Physics
01
R
324/35
G01R 23/00 (2006.01) G01R 11/52 (2006.01) G01R 27/00 (2006.01) H02H 3/36 (2006.01) H02H 3/44 (2006.01) H02H 7/16 (2006.01)
Patent
CA 1189145
Abstract A system for monitoring the capacitor batteries of a three-phase filter circuit. Each capacitor battery is formed of a plurality of parallel legs each having a plurality of sectional capacitors which are connected in series with fuses. Adjacent ones of the sectional capacitors are coupled to one another. In a three-phase system, three capacitor batteries are coupled to one another in a Y-circuit configuration, the Y-circuit node being coupled to a reference potential, illustratively ground. The magnitude and phase of the fundamental frequency component of the current flowing from the Y-circuit node to the reference potential is monitored, variations therein being evaluated to identify defective sectional capacitors. Only variations in the Y-circuit node current which occur rapidly will trigger fault signals, thereby preventing false indications resulting from variations in temperature.
378309
Becker Michael
Fendt Alfons
Povh Dusan
Renz Klaus
Schuch Gerhard
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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