US 11,808,824 B2
Systems and methods to identify open phases of a capacitor bank
Kei Hao, Anaheim, CA (US); and Jeremy William Blair, Jackson, MS (US)
Assigned to Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed by Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed on Mar. 17, 2021, as Appl. No. 17/204,250.
Prior Publication US 2022/0299579 A1, Sep. 22, 2022
Int. Cl. G01R 31/64 (2020.01); G01R 19/10 (2006.01); G01R 25/00 (2006.01); G01R 19/165 (2006.01); G01R 19/25 (2006.01)
CPC G01R 31/64 (2020.01) [G01R 19/10 (2013.01); G01R 19/16571 (2013.01); G01R 19/2513 (2013.01); G01R 25/00 (2013.01)] 24 Claims
OG exemplary drawing
 
18. An intelligent electronic device, comprising:
processing circuitry;
a communication system; and
a memory device comprising instructions that cause the processing circuitry to:
calculate a power phasor for each phase of a multi-phase capacitor bank system with respect to an ABC phase rotation, an ACB phase rotation, or both, wherein the power phasor comprises a vector product of a voltage received from a respective combo sensor at each phase of one or more phases of the multi-phase capacitor bank system and a fundamental frequency of a neutral current received from a neutral current sensor;
in response to each magnitude of each power phasor being greater than a threshold value:
determine which of the one or more phases are open based on each phase angle of each power phasor; and
issue a notification indicating the one or more phases that are open.