SU99519A1 - Relay device for automatic self-synchronization of synchronous generators - Google Patents

Description

The invention is a device for monitoring frequency difference in self-synchronizing devices of generators.

In the known self-synchronization devices, an inductive relay of the type DFR is used for this purpose.

In the proposed device, a current electromagnetic relay is used to control the difference in the frequency of the network and the synchronous generator, which warrants the circuit of the device and prevents its manufacture.

FIG. Figure 1 shows the automatic self-synchronization of low-voltage generators for use in the generator circuit of an air-powered automaton; in fig. 2- uke for the switch.

As can be seen from the diagrams, when the switch 1 is turned on, a small electric current flows in the windings of the stator of the generator 2 and a weak rotating magnetic field forms in the winding of this stator, leading to an electromotive force in the excitation winding 3 of the generator connected to the current relay 4. Relay 4 11 is triggered, CBOII is normally open (HP) contact, supplies power to the winding of the intermediate relay ij. The relay Y triggers, self-locks and prepares the circuit to supply power to the winding of relay 6. When the generator is accelerated to a speed close to synchronous E.D., it is induced in the field winding .-, becomes so small that relay 4 releases its contacts . Its FROM (normally closed) contacts are closed and supply power through the closed relay contacts) to the winding of relay 6. The latter is triggered, self-locking and gives a pulse to turn on the automaton A (in Fig. 1, the power of the electromagnet J {) or the switch (in Fig. 2-power coil BS).

Automatic (switch) is triggered and connects the generator to the network.

An excitation current is applied to the field winding 5:

a) in FIG. 1 when the automaton A is triggered, its blocking contact / g closes; The electromagnetic contactor 7 is activated and breaks the relay circuit 4; the contact contacts of the circuit break and break the circuit of the operative contacts of relay 4; b and the power supply to the Lavtomat coil is transmitted through the closed HOh contact switch of the automaton A.

The generator can be disconnected from the relay protection (opening the contact) either manually by pressing the “stop” button or by turning the key.

b) according to FIG. 2, the blocking contact I-i of the automatic circuit breaker (switch) is opened, the automatic direct current circuit is unlocked and the automatic switch 7 is activated.

The generator can be disconnected by breaking the contact S in the relay protection circuit and KU.

The diagram shown in FIG. 1 is made with variable operative current, and the circuit shown in FIG. 2 is constant, and the solenoid including the BS can be for alternating or direct current. The generator excitation winding circuit does not break in the first case (Fig. 1) due to the sequence of operation of contacts K. and contactor 7, and in the second case (Fig. 2) due to the use of an automatic switch 7 with sliding contacts D overlapping the switching interval ab; the main contact of the machine is contact O.

The operational circuit control in FIG. 2 is implemented as follows: power supply iodine by closing

Contactor buttons (or intermediate relay) 9 with self-locking; termination of the power-by breaking the self-fixing circuit of the contactor (relay) 9 by means of the contact / c on the shaft of the automaton A.

The contact block on the shaft of the automaton A serves to facilitate the work of the contacts of the contactor (relay) .9.

To enable self-synchronization of the generator, which is idling, a self-resetting button is provided after pressing the button, which identifies the contacts of relay 4; by pressing button C, the circuit prepares for the impulse to turn on the switch during self-synchronization, after which the circuit operates automatically as described.

The incorporating solenoid in the circuit of FIG. 2 can be performed both for alternating current (with an automatic device) and for direct current (with a switch).

Subject invention

A relay device for automatic self-synchronization of low voltage synchronous generators, characterized in that, in order to simplify the device circuit and reduce the cost of its manufacture, a current electromagnetic relay is used to control the difference between the network frequency and the synchronous generator, and the stator winding of the synchronous generator is powered during switching on through active resistances, for example, incandescent lamps.

FIG. one

No. 99519

FIG. 2

if№

Lb