US 12,385,984 B2
Monitoring the operation of an electrical coil assembly
Christoph Armschat, Erlangen (DE); Klaus Pointner, Linz (AT); and Helmut Reisinger, St. Georgen/Gusen (AT)
Assigned to Siemens Energy Global GmbH & Co. KG, Munich (DE)
Appl. No. 18/252,074
Filed by Siemens Energy Global GmbH & Co. KG, Munich (DE)
PCT Filed Nov. 6, 2020, PCT No. PCT/EP2020/081289
§ 371(c)(1), (2) Date May 8, 2023,
PCT Pub. No. WO2022/096121, PCT Pub. Date May 12, 2022.
Prior Publication US 2023/0400531 A1, Dec. 14, 2023
Int. Cl. G01R 31/52 (2020.01); G01R 31/62 (2020.01); G01R 31/72 (2020.01); H02H 3/20 (2006.01)
CPC G01R 31/52 (2020.01) [G01R 31/62 (2020.01); G01R 31/72 (2020.01); H02H 3/20 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for monitoring an operation of an electrical assembly including a plurality of coils disposed electrically in a parallel circuit, the method comprising:
using a tap on a winding for off-power detection of a voltage at each coil;
determining an AC component of the detected voltage for each coil;
determining a mean value of the voltage at the coils;
evaluating the AC component for each coil with respect to the determined mean voltage value and applying a weighting; and
generating a signal output upon a weighted deviation of a value, describing the AC component of the voltage detected in a coil, from a value describing the mean voltage, exceeding a specified limiting value.