Reivindicaciones

CLAIMS 1. 1.- A rapid deexcitation system for synchronous machines (1) with indirect excitation by means of an excitation machine (2) and rotating rectifier bridge (8), characterized in that it comprises: - a deexcitation impedance (10) connected between the field winding (5) of the synchronous machine (1) and the rotating rectifier bridge (8); - a controller (9) connected in parallel with the deexcitation impedance (10); - a control circuit (11) of the controller (9) configured to: · keep the controller (9) closed such that the rotating rectifier bridge (8) directly feeds the field winding (5) of the synchronous machine (1) during normal operation of the synchronous machine (1); · open the controller (9) such that the deexcitation impedance (10) remains in series with the field winding (5) and with the rotating rectifier bridge (8) when the synchronous machine is to be deexcited. 2. 2.- The rapid deexcitation system for synchronous machines with indirect excitation according to claim 1, characterized in that the deexcitation impedance (10) is a resistor. 3. 3.- The rapid deexcitation system for synchronous machines with indirect excitation according to the preceding claims, characterized in that the controller (9) is a static switch. 4. 4.- The rapid deexcitation system for synchronous machines with indirect excitation according to the preceding claims, characterized in that the control circuit (11) is configured to open the controller (9) depending on the voltage at the output of the rotating rectifier bridge (8) such that when acting on the field winding of the exciter (6), the voltage at the output of the rotating rectifier bridge and therefore the deexcitation of the synchronous machine (1) can be controlled. 5. 5.- The system according to claim 4, characterized in that the control circuit (11) comprises: - a voltage divider in parallel with the rotating rectifier bridge (8) and comprising a first auxiliary resistor (12) and a second auxiliary resistor (13), said voltage divider being configured to close the controller (9) when the voltage on the second resistor (13) reaches a particular value. 6. 6.- The system according to claim 5, characterized in that the control circuit (11) additionally comprises a zener diode (14) in parallel with the second resistor (13) and configured to the protection of the controller (9).