Abstract: The invention relates to a system and method for protecting against faults between turns in excitation windings of synchronous machines with static excitation, which is based on comparison between the excitation intensity measured and the theoretical excitation current calculated for that operating point using the voltage and current measurements in the armature.

Abstract: The invention relates to a system and method for protecting against faults between turns in excitation windings of synchronous machines with static excitation, which is based on comparison between the excitation intensity measured and the theoretical excitation current calculated for that operating point using the voltage and current measurements in the armature.

Abstract: A system and method for monitoring a rapid de-excitation system for synchronous machines with indirect excitation, via an exciter machine and a rotating rectifier bridge includes means for measuring the current and voltage of the stator of a synchronous machine, means for measuring the excitation current of the exciter machine, estimation means for obtaining the estimated excitation current of the exciter machine from the current and voltage values measured in the stator of the synchronous machine, a module for comparing the measured excitation current Imed with the estimated excitation current Iest, in such a way that there is either incorrect operation if Imed >k*Iest+A, where k and A are real numbers determined on the basis of each machine, or else there is correct operation.

Abstract: A system and method for monitoring a rapid de-excitation system for synchronous machines (1) with indirect excitation, via an exciter machine (2) and a rotating rectifier bridge (8), comprising: means for measuring the current (13) and voltage (14) of the stator (4) of the synchronous machine (1); means for measuring the excitation current (15) of the exciter machine (2); estimation means (24) for obtaining the estimated excitation current (19) of the exciter machine (2) from the current (16) and voltage (17) values measured in the stator (4) of the synchronous machine (1); a module (28) for comparing the measured excitation current Imed (18) with the estimated excitation current Iest (19), in such a way that: there is either incorrect operation if Imed>·Iest+A, where k and A are real numbers determined on the basis of each machine; or else there is correct operation.