SU432638A1 - BRUSHLESSNY SYNCHRONOUS MACHINE DRIVER.nrif? '•;:' •• '; • VU "l, -i".! - •.' - Google Patents

Description

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The proposed brushless exciter of a synchronous machine is designed to work in power supply or electric circuits when the reliability of the brush contact is insufficient or the contact is unacceptable (chemically harmful or explosive environment, high currents through the brush contact, etc.).

In the known brushless exciters of synchronous machines consisting of an inverted and synchronous generator and a rotating diode rectifier, from the output terminals of which the rotor winding of the excited synchronous machine is powered, the core of the inverted synchronous generator at short circuits in the exciter is protected by quick-acting fuses included consistent with silicon diodes.

Fuses are not a sufficiently reliable element, and with a small number of parallel branches (less than 3) they do not provide for selective disconnection of the branches.

Brushless exciters are known, the rotating rectifiers of which are made without protective fuses. The protection of such an exciter from internal short circuits is carried out with the help of a device that reacts to bursts of excitation current of the exciter during its sudden short

closure Such a device does not detect an internal short circuit of the exciter if the damage (for example, a diode) has occurred in the absence of excitation of the exciter or when the rotor is stationary.

In order to increase the reliability of the exciter and simplify it in the proposed brushless exciter between the main poles in the transverse axis of the inverted synchronous generator an additional winding is placed, which is connected to one of the windings of the differential relay, the other winding of this relay is connected to the current sensor of the excitation current inverted synchronous generator, and the output of the differential relay is connected to the executive body, disconnecting the power in the excitation circuit.

In order to operate reliably in the excitation modes of the exciter, the proposed brushless exciter is equipped with a time relay, and the output of the differential relay is connected to an actuator via a time relay.

FIG. 1 is a schematic diagram of the described brushless driver; in fig. 2 — proposed brushless exciter, transverse section; in fig. 3 - characteristics of the inverted synchronous generator.

The brushless exciter has a synchronous generator of the reversed design with a fixed winding of 1 exciter and a rotating winding of 2 boxes. The winding 3 of the rotor of the driven synchronous machine 4 is powered from the winding of the core through a rotating rectifier 5, which does not have safety fuses and is assembled either according to a bridge circuit or a circuit with a zero output.

To detect the internal short circuits of the exciter, there is a device in the form of a differential relay 6 with two windings, one of whose windings 7 is given a signal proportional to the current of the winding 2 core and removed from the terminals of the winding 8 located between the poles of the reverse synchronous generator in its transverse axis, and to the other winding 9, a signal proportional to the current or excitation voltage of the driver.

At the terminals of the winding 8, located in the transverse field of the inverted synchronous generator, from the highest spatial harmonics ppm. The core is induced by an electromotive force proportional to the current of the core of the inverted synchronous generator, the proportionality coefficient depending on the nature of the generator load. For example, if during operation of the exciter on the rotor winding of the manshna being excited there is a relationship between the ppm. If the winding 8 and the core current are characterized by direct I (Fig. 3), then if the circuit is short-circuited inside the inverted generator, this relationship will be different (Direct II). The differential relay 6 is adjusted so that during normal operation of the brushless driver, the output signal of the relay is missing.

Nri short circuit inside the exciter e. d. at the terminals of the winding 8 is reduced, and at the output of the differentiating device, due to the unbalance of currents, a signal appears that, in order to detun from false alarms, for example, when the excitation is forced, is fed to the device 10 of the time delay of the time relay. The signal after a time delay affects the switching apparatus, by which the power supply of the excitation winding 1 is turned off.

A thyristor rectifier can be used as switching equipment.

10 with its control device 11.

Subject invention

Claims (2)

1. A synchronous machine exciter pathogen consisting of an inverted synchronous generator and a rotating rectifier, characterized in that, in order to increase the reliability of the exciter and simplify it, between the main poles in the transverse axis of the inverted synchronous generator, the additional winding is connected to one from the differential windings of the relay relay, the other winding of this relay is connected to the current sensor (for example) of the excitation of the inverted synchronous generator, and the output of the differential relay is connected n to the actuating body shuts off power to the drive circuit. 2. Brushless exciter according to claim 1, characterized in that, for the purpose of the case operation during the excitation modes of the exciter, it is equipped with a time relay, and the output of the differential relay is connected to the executive via a time relay. ue.P fui3