SU32608A1 - Device for automatic synchronization of a synchronous generator with a network - Google Patents

Description

The present invention relates to devices for automatically synchronizing a synchronous generator with a network, in which an electric motor is connected, connected to a servo-motor controlling the inlet valve of the primary motor, and gradually increasing the number of revolutions of the generator to a synchronous one. associated with the shaft of the synchronous generator.

The device is characterized by the use of two gears with different gear ratios connecting the motor shaft and the servo motor spindle, and serving to go from one increment to the speed of the servo motor to another, the first of which increases the speed and links the motor to the servo at the beginning start-up, and the second - after the generator reaches a certain number of turns.

The drawing shows schematically the proposed device with an indication of how it is turned on.

The tachometer is a dynamo, in this case, direct current connected to the shaft of the prime mover, feeds the motor / connected to the spindle of the servo motor 2 of the prime mover, in this case

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water turbines, two gear systems 3, 4 s. different gear ratios. Through the first system 3, the spindle can move at a higher speed, for example, 1 mm per second; while the second system 4, being disengaged in the motor shaft, remains at rest. By means of the second system 4, the speed of movement of the spindle can be reduced by a certain number of times, for example, sixteen, and, in turn, the first system is turned off and does not work. The motor shaft is switched from one system to another by means of a solenoid 5, which is connected to the tires of the tachometer-dynamo and controls the pawl 6, and the spring 7, which pulls the lever, which moves the gears with the coupling coupling. The solenoid circuit can be switched on automatically using a relay, powered tachometer-dynamo and triggered at a certain voltage tachometer-dynamo.

When synchronizing the generator with the network, first, as usual, the voltage is exactly equalized, which can be done, for example, by means of an adjusting resistor 8 connected to the generator circuit, the handle 9 of which is connected to the lever 10 controlled by two electromagnets // connected to the second winding of two voltage transformers 12, respectively, powered by a connected generator and a network. The generator is switched on at the appropriate moment automatically, in this case, with the help of a balance-rel e 13, connected to the transformers 72 and closing the electrical drive circuit of the generator oil switch 14 after the latter has reached the synchronous speed and phase coincidence. The pins 15, connected to the crosshead of the switch, are blocking, closing the servo circuit with the switch open and back.

When synchronizing the generator and the network, while increasing the number of revolutions of the unit, the voltage tachometer and the number of revolutions of the electric motor 7 will also increase. Since the engine is connected to the first transmission system at the start, the servo motor will force the turbine inlet valve to open at high speed. When reaching the last speed, close to synchronous, for example, 95-96% of synchronous, the high-speed voltage regulator automatically turns on; at the same time, the above relay will close the solenoid circuit 5, the last act of the pawl and will force the spring to switch the motor shaft to the second transmission system. The unit will begin to increase its speed much more slowly, and when the equality of the voltages and the coincidence of the phases of the generator and the network are reached, the balancer 13 closes the switch drive circuit, which turns the generator on to the network. Opened simultaneously blocking contacts 75 will interrupt the power supply circuit of the servomotor, after which the device will begin to work normally.

The subject matter of the invention.

A device for automatically synchronizing a synchronous generator with a network using a tachometer-dynamo connected to the shaft of the synchronous generator and supplying motor 7, connected by means of a gear with a servo-motor controlling the intake valve of the primary engine, and serving to bring the generator speed up to synchronous, at first with a large increment of speed, and then with a smaller one, characterized in that in order to go over from one increment of the speed of movement of the speed regulator of the prime mover on the other, two gears 3, 4, with different gear ratios, are used to connect the servo motor 2 with the regulator shaft, of which the first, giving the controller a higher speed increment, connects the servomotor with the regulator at the start of the start, and the second after reaching a generator of a certain number of revolutions, and for switching from one gear to another serves solenoid 5, the winding of which is driven to the tachometer-dynamo voltage and which is intended to be thrown off when the determined voltage is loaded chat gear lever.

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