A voltage sag generator device (30) for use in an electrical generator machine (2) such as a wind turbine, connected to an electrical network (1) including one to three parallel transformers (3, 4, 5) connected on one side to the wind turbine (2) via a coupling switch (7) and circuit breakers (13, 11, 10), and earthed on the other side via circuit breakers (18, 17, 16) and a control switch (6); means for causing short-circuits when the coupling switch (7) and the control switch (6) are actuated in such a way that a voltage sag having the required duration and type is generated; and means for protecting the transformers (3, 4, 5) during voltage sag generation.
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