A method for determining the electric resistances (RSi) of connections of coils (Bi) of a dynamo-electric machine winding which includes a plurality of coils (Bi) connected in series, said method comprising the steps of: - providing a first voltage generator for inducing a first, fixed, current which applies a voltage to a first coil connection of a first coil of the winding with respect to a potential point; - providing a second voltage generator for inducing a second, variable, current which applies a voltage to a first coil connection (3; 7) of a second coil (B2; B6) of the winding with respect to said potential point, so as to eliminate the current flowing through a portion (B4-B11; B8-B11) of the winding that is proximate to the first coil connection of the first coil and the first coil connection (3; 7) of the second coil (B2; B6) by: - measuring a feedback voltage between a second coil connection of a third coil and a second coil connection (4; 8) of a fourth coil (B3; B7), wherein the third coil is adjacent to the first coil and connected to the first coil connection of the first coil, the first coil connection of the first coil being the first coil connection of the third coil, and the fourth coil (B3; B7) is adjacent to the second coil (B2; B6) and connected to the first coil connection (3; 7) of the second coil (B2; B6), and - regulating via a regulator the second, variable, current to make the feedback voltage equal to zero; - providing a third voltage generator for inducing a third, fixed, current which applies a voltage to a second coil connection of the first coil with respect to said potential point, whereby said first voltage generator induces a first current through said first coil connection of said first coil of the winding, said second voltage generator induces a second current through said first coil connection (3; 7) of said second coil (B2; B6) of the winding and said third voltage generator induces a third current in said second coil connection of the first coil; - measuring a first voltage across the third coil, - measuring the current flowing through the first coil connection of the first coil; - determining the resistance of the first coil connection of the first coil from the first measured voltage and the measured current flowing through the first coil connection of the first coil. - providing a first voltage generator for inducing a first, fixed, current which applies a voltage to a first coil connection of a first coil of the winding with respect to a potential point; - providing a second voltage generator for inducing a second, variable, current which applies a voltage to a first coil connection (3; 7) of a second coil (B2; B6) of the winding with respect to said potential point, so as to eliminate the current flowing through a portion (B4-B11; B8-B11) of the winding that is proximate to the first coil connection of the first coil and the first coil connection (3; 7) of the second coil (B2; B6) by: - measuring a feedback voltage between a second coil connection of a third coil and a second coil connection (4; 8) of a fourth coil (B3; B7), wherein the third coil is adjacent to the first coil and connected to the first coil connection of the first coil, the first coil connection of the first coil being the first coil connection of the third coil, and the fourth coil (B3; B7) is adjacent to the second coil (B2; B6) and connected to the first coil connection (3; 7) of the second coil (B2; B6), and - regulating via a regulator the second, variable, current to make the feedback voltage equal to zero; - measuring a feedback voltage between a second coil connection of a third coil and a second coil connection (4; 8) of a fourth coil (B3; B7), wherein the third coil is adjacent to the first coil and connected to the first coil connection of the first coil, the first coil connection of the first coil being the first coil connection of the third coil, and the fourth coil (B3; B7) is adjacent to the second coil (B2; B6) and connected to the first coil connection (3; 7) of the second coil (B2; B6), and - regulating via a regulator the second, variable, current to make the feedback voltage equal to zero; - providing a third voltage generator for inducing a third, fixed, current which applies a voltage to a second coil connection of the first coil with respect to said potential point, whereby said first voltage generator induces a first current through said first coil connection of said first coil of the winding, said second voltage generator induces a second current through said first coil connection (3; 7) of said second coil (B2; B6) of the winding and said third voltage generator induces a third current in said second coil connection of the first coil; - measuring a first voltage across the third coil, - measuring the current flowing through the first coil connection of the first coil; - determining the resistance of the first coil connection of the first coil from the first measured voltage and the measured current flowing through the first coil connection of the first coil.