US 12,078,680 B2
Method for detecting an electrical fault in the stator of an electric machine, especially in the generator of a wind turbine
Ravindra Bhide, Cambridge (GB); Nuno Miguel Amaral Freire, Brande (DK); Rahul R Pillai, Ikast (DK); and Ireneusz Grzegorz Szczesny, Tørring (DK)
Assigned to Siemens Gamesa Renewable Energy A/S, Brande (DK)
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
Filed on Apr. 27, 2022, as Appl. No. 17/730,546.
Claims priority of application No. 21172507 (EP), filed on May 6, 2021.
Prior Publication US 2022/0357397 A1, Nov. 10, 2022
Int. Cl. G01R 31/34 (2020.01); F03D 7/02 (2006.01); F03D 9/25 (2016.01); F03D 17/00 (2016.01); H02P 9/02 (2006.01)
CPC G01R 31/346 (2013.01) [F03D 7/0224 (2013.01); F03D 7/026 (2013.01); F03D 9/25 (2016.05); F03D 17/00 (2016.05); H02P 9/02 (2013.01); F05B 2220/706 (2013.01); F05B 2260/70 (2013.01); F05B 2260/80 (2013.01); F05B 2260/85 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for detecting an electrical fault in the stator of an electric machine, wherein the stator comprises multiple groups of windings, wherein the windings of each group are assigned to a respective phase of the electric machine, comprising:
determining a current
between a neutral point that is connected to at least one winding of each of the groups and either a further neutral point that is connected to at least one further winding of each of the groups or to a common neutral point connected to at least the neutral point and the further neutral point,
evaluating a fault condition, wherein the fulfilment of the fault condition depends on the determined current, and
outputting a fault signal to personnel and/or a device when the fault condition is fulfilled.