SU1129694A1 - Device for protecting diesel-electric propulsion plant when loss of torque of diesel engine occurs - Google Patents

Abstract

DEVICE FOR ZMSCHTY crest diesel electric equipment during loss DIESEL ENGINE TORQUE, main motor generators and consumers which are connected in series to a constant current circuit is maintained .On predetermined level generator excitation system, comprising a generator of tahoge- connected thereto speed switch, which make contact included in the circuit of the contactor winding with the closing contacts between the excitation winding and the excitation system, as well as the block of the floor with power from the ship A network connected to the generator excitation winding through the locking contacts of the quenching contactor, the winding of which is connected to an additional power source through the closing contact of the switch, which in order to increase the reliability of the device by protecting the diesel generator from the reverse. rotation when the torque of a diesel engine disappears, the device is additionally equipped with a time relay, an intermediate relay, a diode and a voltage relay connected to the core winding of the generator (L diode, and the time relay contacts are closed, the winding of which is connected to an additional power source with the closing block contact switch and the speed relay open contact and winding N3 of the intermediate relay is connected parallel to the time relay winding, one short circuit CD O5 contact of which is connected to the contactor winding circuit quenching the floor, and CO 4i through a parallel connected second closing contact of the intermediate relay and the closing contact of the voltage relay the winding of the intermediate relay is connected to an additional source Itani.

Description

111 The invention relates to electric drives operating according to the generator torus-motor scheme, and can be used in diesel-electric propulsion units of constant current, used mainly in commercial and industrial fleets. It is known a device for protecting drive motors of main generators of comb diesel-electrical installations from reverse rotation when diesel loses torque, which contains a tachogenerator mounted on the generator shaft to which the speed relay is connected, and the closing contacts of the speed relay are in the control winding circuit of the intermediate relay, the closing contacts of which are included in the winding circuit of the generator exciter contactor, and the closing contacts of the contactor are in the circuit of the excitation winding nerator 3,. However, this device does not provide reliable protection of the lost torque of the drive motors of the main generators from reverse rotation in the rowing electrical installations of a constant current, because they continue to flow through the main circuit and maintain the current at the nominal level of the excitation system of others operating in the main circuit. HEL generators, a torque appears on the shaft of a faulty diesel generator, even when the excitation winding is disconnected due to the action of the longitudinal reaction of the core, due to some possible shift of the brushes from the geometric neutral to rotation and residual magnetization of the generator. The closest to the invention to the technical essence is / device for protecting the diesel generator of the diesel rowing unit when the diesel torque fails, the main generators of which and the consumer electric motors are connected in series to the constant current system maintained at a given level consisting of a tachogenerator mounted on a shaft with a speed relay connected to it, the closure terminal of which is connected to the contactor winding circuit with a circuit contacts between the excitation winding and the excitation system, as well as the field quenching unit, powered from the ship network and connected to the generator excitation winding through the closing contacts of the quenching contactor, which is connected to the secondary power supply source through In this case, the field gain unit is connected to the generator excitation winding only in the IT position of the switch, i.e. at the moment when its core winding is in a shorted state, prior to its inclusion in the main circuit and turning off the main circuit of the constant current of the rowing device, f is set, however, when the generator is inserted into the constant current circuit when the switch is in the 1n position, and the torque suddenly disappears diesel engine even after the speed relay has been reset and the generator excitation system is turned off this device cannot protect the diesel generator from reverse rotation, which becomes possible in constant current installations due to the action of the longitudinal core reaction due to the shift of the brushes from the neutral and due to the residual magnetisation of the generator. The purpose of the invention is to increase reliability by protecting a diesel generator operating in a fixed-type plant against reverse rotation when the diesel torque disappears. The goal is achieved by the fact that in the device for protection of the crests of a diesel-electric installation when diesel torque fails, the main generators of which and the consumer electric motors are connected in series to the circuit, a constant current maintained at a given level by the generator excitation systems containing a tachogenerator with a relay connected to it speeds, the closing contact of which is included in the circuits of the contact winding with the closing contacts of the melada by the excitation winding and the excitation system, as well as e block for power supply from the ship network.

31

connected to the generator excitation winding through the closing contacts of the quenching contactor, whose winding through the closing contact block switch is connected to an additional power source, is additionally equipped with a time relay, intermediate relay, diode and voltage relay connected to the core winding of the generator through the diode and short contacts of the time relay the winding of which through the closing block-contact of the shifter and the opening contact of the speed relay is connected to an additional power source, and parallel On the time relay winding, an intermediate relay winding is connected, the ONE closing contact of which is included in the winding circuit of the contactor winding circuit, and through parallel connected the second closing contact of the intermediate relay and the relay contact voltage of the intermediate relay winding is connected to an auxiliary power source.

The drawing shows a schematic diagram of a device for protecting the crests of a diesel-electric installation.

The main generators 1 and 2 of the installation and the electric motors of the 3 consumers are connected in series to the constant current circuit maintained at the back level by the excitation systems A and 5 of the generators. The device consists of a tachogenerator 6 mounted on the generator shaft with a speed relay 7 connected to it, the closing contact 8 of which is connected to the winding circuit of the contactor 9 with the closing contacts 10 and 11 between the excitation winding 12 and the excitation system. The X also includes a quench box 1-3, which includes two half-wave rectifiers, each of which is powered by a separate transformer 14 connected to the ship's AC source, and contains a series-connected diode 15 and a working winding 16 a magnetic amplifier, the control winding 17 of which is the main circuit bus, the rectifier outputs being connected in opposite directions and connected to the field winding of the generator through the closing terminals -I and 19 of the suppressor contactor field 20,

29694Л

in the winding circuit of which there is a closing block-contact 21 of the switch 22. The device is equipped with a voltage relay 23 connected to the core 5 of the generator winding through a diode 24 and short-circuit contacts 25 and 26 of the time relay 27, in the control winding circuit of which the connecting block contact is connected 28 switch and release 10 speed relay contact 29. Parallel to the winding of the time relay, the winding of the intermediate relay 30 is connected, the closing contact 31 of which is included in the winding circuits of the contactor rats of the floor-pole, and the power supply circuit of the intermediate relay includes parallel connected closing contact 32 of the intermediate relay and shorting contact 33 of the voltage relay. The closing contacts are 34 and 35, as well as blurring. The soft contact 36 of the switch 22 is connected to the main current circuit, and the closing block contact 37 is connected to the winding circuit of the contactor 9 connected 5 to the additional power source 38.

The device works as follows.

When the generator is rated to 0 1 in the constant current circuit, the switch 22 is in the lil position. In this case, the switch contacts 34, 35, 37, 28 are closed, the contact 29 of the speed relay 7 is open, and the contact 8 of the same speed relay is closed, as a result of which the winding of the contactor 9 is energized and the excitation system 4 through the closed contacts 10 and 11 works for

excitation winding 12. In case of a sudden disappearance of the torque moment. The diesel engine drive generator 1 reduces the rotational speed, speed relay 7 opens contact 8 and closes contact 29, as a result, excitation system 4 is disconnected from excitation winding 12, and winding receives power, time relay 27 After the expiration of the time delay equal to the time of decay to zero of the current in the excitation winding, time relay 27 is triggered and by its contacts 25 and 26 is connected to the core winding of the generator 1 a meter: a circuit, consisting of a relay eg. 23 and diode 24. If the brushes are shifted from the neutral, in the root winding from flowing through it

S

From the other generators of the foot channel current, the emf of the longitudinal reaction of the core, Et is induced, and the emf, added to the emf of residual magnetization of the generator, forms the total emf of the winding of the generator, under the action of which the voltage relay 23 is triggered

The diode 24 is slugged so that the operation of the relay 23 can occur only when the brushes are shifted against the direction of rotation.

After the operation of the voltage relay 23, adjusted to the value of the EMF of the winding core, corresponding to the torque on the generator shaft 1, is sufficient for rotation of the diesel engine in the opposite direction, contact 33 energizes intermediate relay 30j which by contact 32 blocks contact 33, providing power to its winding, and pin 31 shunts

/ F

296946

the contact 21 of the switch 22, thereby providing power to the winding of the contactor 20, As a result, the contacts 18 and 19 of the contactor 20 connect the field circuit 13 to the driver circuit 12, which creates a magnetizing force directed oppositely by the magnetizing force of the longitudinal core and residual O magnetizing, thereby protecting the diesel generator from reverse rotation.

This device increases the reliability of the diesel generator protection device, ensuring its protection against reverse rotation in the event of sudden torque occurrence also in the case when it becomes possible with constant current settings due to residual magnetisation and brush shear from the neutral.

fc,

1, .- rf

Claims (1)

A DEVICE FOR PROTECTING A CREAM DIESEL-ELECTRICAL INSTALLATION DURING THE DIESEL OF ROTATING DIESEL DIESEL, the main generators of which and the consumer electric motor are connected in series into a constant current circuit maintained at a predetermined level by the excitation systems of the generators, containing a tachogenerator with a speed relay connected to the circuit contactor windings with make contacts between the field winding and the excitation system, as well as a field blanking unit powered by a ship set and connected to the excitation winding of the generator through the closing contacts of the field blanking contactor, the winding of which is connected through a closing block contact of the switch to an additional power supply, characterized in that, in order to increase the reliability of the device, by protecting the diesel generator from reverse. rotation when the diesel torque disappears, the device is additionally equipped with a time relay, an intermediate relay, a diode and a voltage relay connected to the generator armature winding through the diode, and short-circuit the time relay, the winding of which is connected to an additional power source through the closing contact block of the switch and the opening contact of the speed relay, and an intermediate relay winding is connected in parallel with the time relay winding, one closing contact of which is included in the winding circuit of the field blanking contactor, and through the second one connected in parallel the intermediate contact of the intermediate turnip and the terminal contact of the voltage relay, the winding of the intermediate relay is connected to an additional • power supply. SU,. „1129694 1 1129694 '2