RU2230416C2 - Brushless self-excited synchronous generator - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: generator has additional stator winding for its excitation, voltage corrector, and built-in electronic protective system that functions to protect generator and its loads against accidents, to remotely disconnect load, and to memorize kind of accident causing disconnection of generator field. Independent-release field switch built in generator is connected to built-in electronic protective system. Independent-release load circuit breaker inserted in generator power circuit is connected to built-in electronic protective system. Off-time delay element is inserted in field switch circuit. Inserted in built-in electronic protective system is unit identifying and memorizing kind of accident causing disconnection of generator field. Auxiliary contact inserted in field switch is connected to kind-of-accident identifying and memorizing unit and at least one thermal relay is built in its bearings. EFFECT: enhanced reliability of generator protective system. 7 cl, 1 dwg

Description

The present invention relates to electrical engineering, in particular to the design of self-excited synchronous brushless generators.

A known synchronous brushless generator with self-excitation, containing an additional stator winding for excitation of the generator and a voltage corrector [1].

Such a generator does not contain internal protection against emergency operation. To protect the consumer and the generator from emergency operation, protection is applied that are installed outside the generator, for example, in the control cabinets of the unit, and others.

A known synchronous brushless generator with self-excitation, containing an additional stator winding to excite the generator, a voltage corrector, an integrated electronic protection system [2].

Such a generator does not provide reliable protection of the consumer and the generator itself from many types of emergency operation modes and does not provide information about the type of accident that caused the protection system to trip.

When developing the proposed generator, the task was to create a design that provides protection to the consumer and the generator itself from emergency operating modes, remote shutdown of the load circuit breaker and remembering the type of accident by which the generator excitation was turned off.

This goal is achieved by the fact that the generator is synchronous brushless with self-excitation, containing an additional stator winding for excitation of the generator, a voltage corrector, an integrated electronic protection system, an excitation switch with an independent release included in the integrated electronic protection system is integrated.

An automatic load circuit breaker with an independent release included in the integrated electronic protection system has been introduced into the generator power circuit.

An element of a trip time delay element is introduced into the circuit of the field switch.

A recognition and memory unit for the type of accident, which turned off the excitation of the generator, and at least one thermal relay was built into its bearings, was introduced into the integrated electronic protection system.

A block contact is included in the excitation switch, which is included in the type of accident recognition and memory unit.

The same technical result will be achieved using the above, in a synchronous brushless generator with self-excitation, containing an independent permanent magnet exciter for excitation of the generator.

These differences are significant, as they provide reliable protection for the consumer and the generator itself from emergency modes of operation, as well as remember the type of accident by which the generator excitation was turned off.

The drawing shows a block diagram of the claimed design.

The generator 1 contains the main winding 2 and an additional winding 3 (or a permanent magnet exciter), from which (which) the field exciter 4 is fed through the voltage regulator 5. An excitation switch 6 is connected to the auxiliary winding 3 circuit (or a permanent magnet magnifier) with a block contact 7 and an independent release 8 connected via a delay element 9 to the integrated electronic protection system 10. The integrated electronic protection system 10 is connected to the main winding 2 of the generator 1 by a connection 11 and to temperature sensors of the generator 1 and its bearings by a link 12. To the output of the built-in electronic protection system 10 is connected an independent release 13 of the automatic load switch 14. To the block contact 7 of the excitation switch 6 and the built-in electronic protection system 10, the recognition and memory unit is connected by connections 15 and 16 type of accident 17.

The excitation switch 6 may have an additional block contact 18 connected to the engine stop circuit of the generator 1.

The generator operates as follows. In the event of an overvoltage or short circuit of any kind, an alarm signal is transmitted via communication 11 to the built-in electronic protection system 10, which, through communication 16, gives the signal of the accident that has occurred to the recognition and memory unit of the accident type 17 and activates an independent release 13 of the automatic load switch 14, due to what happens when the load of the generator 1 is disconnected. If, after disconnecting the load of the generator 1, the alarm signal is lost, then the built-in electronic protection system 10 is set to the original emergency condition and generator 1 continues to operate in idle mode. If, after disconnecting the load of the generator 1, the alarm signal is saved, then with the time delay provided by the delay element 9, the independent release 8 of the excitation switch 6 is activated, as a result of which the additional winding 3 (or the permanent exciter) is disconnected from the voltage regulator 5 and de-energizes the excitation winding of the pathogen 4, thereby de-energizing the generator 1. After the excitation switch 6 is turned off, through its block contact 7, a memory signal for to recognizing and remembering the type of accident 17, which, having remembered the type of accident that has occurred, will save it until the excitation switch 6 is turned on again.

In the presence of an additional block contact 18, turning off the excitation switch 6 leads to the operation of the block contact 18, which supplies a signal to the stop circuit of the drive motor of the generator 1.

The built-in electronic protection system 10, an automatic load switch 14 with an independent trip unit 13, an excitation switch with a block contact 7 and an independent trip unit 8, as well as a delay element 9 and a recognition and memory unit for the type of accidents 17 operate in the same way when a signal is received via communication 12 overheating of generator 1 or its bearings.

Thus, the proposed design of the generator provides: protection of the consumer and the generator itself from emergency operation (overvoltage, short circuit of any kind, overheating of the generator, overheating of the bearings) with preliminary disconnection of the generator load, which is especially important when the generator is working in parallel with a network or another generator; shutdown of excitation of the generator with time delay when the circuit breaker is not disconnected; visual control of the type of accident that occurred, followed by its storage after disabling the excitation of the generator; the ability to stop the drive motor of the generator according to the trip signal of the field switch.

At the request of the consumer, protection can also be provided for other parameters.

The design features of the generator listed above increase the reliability of protecting the consumer and the generator itself from emergency operation.

Sources of information

1. Prospectus of the company MESS ALTE Generatoren GmbH. Generators of the EU series.

2. Prospectus from STAMFORD AC GENERATORS FROM NEWAGE INTERNATIONAL.

Claims (7)

1. A synchronous brushless self-excited synchronous generator, comprising a main stator winding, an additional stator winding or a permanent magnet exciter for exciting the generator, a voltage regulator, an exciter winding, an integrated electronic protection system, the exciter winding connected to an additional stator winding or exciter for constant magnets through a voltage regulator, characterized in that in the circuit of the additional winding of the stator or exciter at constant The magnets have an excitation switch with an independent trip connected to the integrated electronic protection system, which is connected to the main stator winding. 2. The generator according to claim 1, characterized in that the power circuit of the generator includes an automatic load switch with an independent trip unit connected to the integrated electronic protection system. 3. The generator according to claim 2, characterized in that a delay element is included in the circuit of the shunt trip of the field switch. 4. The generator according to claim 1, characterized in that an accident type recognizer is connected to the integrated electronic protection system. 5. The generator according to claim 4, characterized in that a block contact built into the field switch is connected to the type of fault recognizer. 6. The generator according to claim 1, characterized in that an additional block contact is included in the field switch included in the stop circuit of the generator drive motor. 7. The generator according to claim 1, characterized in that at least one temperature sensor connected to the integrated electronic protection system is integrated in its bearings.