RU1802912C - Device for excitation of synchronous machine - Google Patents

Abstract

Use: in PSP engine x-generators with an independent excitation system. Essence: in the device dl. the inverter 22 is inputted to the excitation of the synchronous machine, and the switch 15 is equipped with two groups of NC contacts 19, 21. The inverter direct current terminals through the contacts 20 are connected to the direct current terminals of the rectifier 16, and the alternating current leads through the contacts 21 and 19 to the winding terminals the stator of the synchronous machine 1 and the winding 10 of the inductor. Starting the electric machine is carried out by changing the frequency of the converter formed by the rectifier 16 and the inverter 22. while the electric machine and the generator operate in the motor mode. At the end of the start, the generator 6 works as a pathogen, pita winding 10 of the inductor. 1 ill.

Description

The invention relates to the field of electrical engineering, in particular to PSP engine m-generators with an independent excitation system.

The aim of the invention is to increase the reliability when starting an electric machine.

The drawing schematically shows a device for driving a synchronous machine.

Synchronous machine 1 comprises a stator winding 2 and an excitation winding 3 connected to the DC terminals 4 of the rotary rectifier 5. The generator 6 is connected by the phase terminals 7 of the three-phase coil 8 to the terminals of the alternating current 9 of the rotary rectifier 5. Each phase of the three-phase inductor 10 generator 6 is divided into two sections. The phase sections are combined in two stars with isolated bullet terminals 11, 12 connected through the make contacts 13 of the switch 14 to the DC terminals 15 of the controlled rectifier 16, equipped with AC terminals 17 for connecting to the network. The same leads of stars are paired together, in the form of different leads 18 of the winding of the inductor 10 connected to the same leads of the NC contacts 19 of the switch 14. V00

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The switch 14 is equipped with two 20 and 21 additional groups of NC contacts. The inverter 22 with DC outputs 23 through the NC contacts of the first additional group 20 is connected to the DC terminals 15 of the controlled rectifier 16. The AC terminals 24 of the inverter 22 are connected with the second terminals of the main NC contacts 19 of the switch 14. The disconnecting contacts of the second additional Groups 21 of the switch 14 are used to connect the inverter AC terminals 25 to the stator winding 2 of synchronous machine 1.

The device operates as follows. When starting the electric machine 1, the opening contacts 19, 20, 21 of the switch 14 are closed, and its making contacts 13 are open. In this case, the stator windings of the electric machine 1 and the inductor 10 of the auxiliary generator 6 turn out to be connected to the alternating current outputs of the inverter 22, and the inverter 22 with the rectifier 1.6, connected in accordance with the circuit of the frequency converter with the DC link. After supplying power to the rectifier 16, an alternating current of increasing frequency flows through both windings (the inverter control system is not shown, since the control process can be carried out by known methods), according to which the rotation speed of the electric machine increases.

At the end of the start, the contacts 19, 20, 21 are opened, and the contacts 13 are closed and the winding of the inductor 10 is connected to the DC terminals 15 of the rectifier 16 and the generator 6 starts to work as a synchronous exciter, and the stator winding is disconnected from the AC power source. The synchronization of the electric machine 1c with the network can be carried out both in an excited state and in an unexcited state.

During the start-up of the electric machine and the auxiliary generator, they work together as accelerating engines, which, if there is a large moment of resistance on the shaft, makes it possible to more rationally distribute the starting load between the two machines, reducing it separately for each machine compared to a single-machine starting. Reducing the starting load on each machine will increase the reliability of the unit as a whole.

Claims (1)

The claims A device for exciting a synchronous machine, comprising a generator, the phase terminals of a three-phase winding of the core of which are connected to alternating current terminals of a rotary rectifier, equipped with a DC terminal for connecting to the excitation coil of a synchronous machine, each phase of the three-phase winding of the generator inductor is divided into two sections, phase sections combined in two stars with isolated zero terminals connected through the make contacts of the switch to the DC terminals of a controlled rectifier, sleep beneath the AC terminals for connecting to the network, the same star leads are paired together, forming the phase leads of the inductor winding, connected to one lead that opens the contacts of the circuit breaker, with the aim of increasing the reliability of the circuit breaker equipped with two additional groups of NC contacts and an inverter is introduced, the DC terminals of which are connected through the NC contacts of the first additional group to the DC and DC terminals of the controlled rectifier, the AC terminals the inverter current is connected to the second terminals of the main NC contacts of the switch, the NC contacts, the second additional group of which are used to connect the inverter AC terminals to the stator winding of the synchronous machine.