JPS5866533A - Fault machine automatic deassembling device at parallel operation time of synchronous machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic disconnection device for failed machines during parallel operation of motor generators with electromagnetic coupling.

Conventionally, a system shown in FIG. 1 has been known as an automatic disconnection device for failed machines during parallel operation of this type of synchronous machine. That is, in the figure, 1 is a power source for driving a motor generator, and the driving power source 1 includes a wiring breaker 2, an electromagnetic contactor 6 for switching on and off the power of the electric motor 5, and a thermal relay 4 for protecting the electric motor 5. The generator 70 and the frequency control electromagnetic coupling 6 are connected in series. A field coil 6a is connected to the electromagnetic coupling B, and a field coil 7a is connected to the generator 7. 8 is a field power transformer with one end of the electromagnetic contactor 6 as a common line, an automatic frequency regulator (AFC), and an automatic voltage regulator 1.
0, and the field current detector 11 of the current coupling 6 is provided with an overcurrent relay 12.
has a normally open contact 12a. On the other hand, the field current detector 16 of the generator 7 includes an overcurrent relay 14, and the overcurrent relay 14 includes a normally open contact 14a.

Further, 15 is a protective air breaker for the generator 7, and 15a is an operating circuit for the air breaker 15, which is connected to the generator bus 16. Reference numeral 17 denotes a motor generator with an electromagnetic coupling, and the figure shows two identical circuits to represent a parallel operation state.

Next, the operation of the conventional parallel operation circuit of the synchronous machine shown in FIG. 1 will be explained below. First, the electromagnetic coupling motor generator 17 is used to improve the quality of the power source 1 and to convert voltage and frequency. In this case, generator bus 1
Frequency control 6 is performed by controlling the current flowing through the field coil 6a of the electromagnetic coupling 2 using an automatic frequency adjustment device (AFC) 9 to change the rotation speed of the generator 70. In addition, regarding the voltage control of the generator bus 16, the voltage flowing through the field coil 7a of the generator 7 is controlled by the own voltage regulator (AvR) 10, and the rotation speed of the generator 7 is controlled as in the case of frequency control. This is done by changing the In this case, the motor generator with electromagnetic coupling 1
The protection device No. 7 is cable protection wiring breaker 2.
, a thermal relay 4 for protecting the electric motor 5, a generator 7, an air breaker 15 for protecting the cable, etc., an automatic frequency adjustment device f (AFC) 9, and an automatic voltage adjustment device (
6 for field overcurrent due to failure of AV [) 10 etc.
A current detector 11.13 is installed in each field coil of a and 7a.
By inserting overcurrent relays 12 and 14 and closing these normally open auxiliary contacts 12a and 14a when a field overcurrent occurs, the trip coil of the air breaker 15 is energized. I was trying to make it trip.

Therefore, since the conventional fault machine disconnection device during parallel operation of periodic machines is configured as described above, it is possible to prevent failures such as a low induced voltage due to field loss of the starting machine during parallel operation. If this occurs, the healthy machine will try to recover from the drop in bus voltage, resulting in field overcurrent, which may cause a mistrip. Similarly, during parallel operation, the field current of the electromagnetic coupling will be lost, and the frequency will increase. Even if a failure occurs that causes the frequency to drop, a healthy machine will try to recover the frequency, resulting in a field overcurrent and the possibility of a mistrip.

The present invention has been made to eliminate the above-mentioned drawbacks, and is designed to identify the side where a field abnormality occurs on the parallel operation side of a synchronous machine as a faulty machine, and to cut off the field abnormality signal of a healthy machine. Furthermore, by providing a confirmation timer to determine that field overcurrent field loss is normal operation during normal sudden load changes, it is possible to identify faulty machines during parallel operation and disconnect them. The purpose of this invention is to provide an automatic disconnection device for failed machines during operation.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, the same parts as in FIG. 1 are indicated with the same symbols. In FIG. 2, 18 is a minimum current setting device for detecting field loss, and the other is an overcurrent setting device for detecting field overcurrent. A comparator 20 that separately compares the constant signal of both the film and the field current with the device 19 is provided, and a comparator 20 that separately compares the constant signal of both the film and the field current is provided. The signal is connected to the field anomaly input OR circuit 22.

Then, the confirmation timer 26 confirms whether the output signal of the OR circuit 22 is operating normally or abnormally.

Reference numeral 24 is a memory and an interlock circuit that stores which field abnormality occurred first and cuts off the abnormal signal of the healthy machine.The memory 24 is provided with a set manual power 24a and a reset manual power 24b. AN that interlocks with the confirmation timer 26 to prevent normal operation from being mistaken for an abnormal signal.
The D circuit 25 is provided with a relay 26 for opening the air breaker 15 in response to an abnormal signal from the electromagnetic coupling 17 and disconnecting the load. 26a is a normally open contact of the relay 26, and 27 is an electromagnetic coupling 17 of the present invention.
28 is a normally open relay that opens the air breaker 15 in response to a generator field abnormality signal and disconnects the load. It has a contact 28a. Further, reference numeral 29 denotes an automatic parallel disconnection device that automatically identifies a faulty machine based on the field abnormality of the generator of the present invention and disconnects the failed machine from the parallel.

In the present invention configured in this manner, specific operations will be described below. In other words, if a field abnormality occurs during parallel operation of synchronous machines, the phenomenon will also occur in healthy machines at the same time, so a method is used that uses elements with a quick response and causes the machine in which the field abnormality occurs first to fail. This is to identify and sort them out. For example, if we consider a case where the thyristor in AF'C is short-circuited due to a failure in the automatic frequency adjustment device (AP'C) 9, the field current on the AFC failure side increases and compared with the overcurrent setting device 19. If the input signal is larger than the set value, a fault signal is output from the comparator 20, and the fault detection signal is input to the memory circuit 24 via the OR circuit 22, and also sets the timer 26.

The signal output from the output circuit of the memory 24 on the faulty machine side immediately forcibly resets the memory circuit 24 on the healthy machine side, and any subsequent abnormal signal generation on the healthy machine side is cut off so that it is not output to the disconnection relay 26. . However, at this time, only the timer 26 is set on the healthy machine side. If the side where the field abnormality occurred first (faulty machine side) returns to normal within the time set by the timer, the memory circuit 24 and timer 26 will be reset, and the forced reset circuit on the healthy machine side will also be released. He prepares for the next field anomaly. (However, at this time, if the field abnormality on the healthy machine side continues, the timer remains set, so this side is considered to be abnormal this time, and the next field @ abnormality causes a trip on the failed machine.) If the field abnormality continues after the timer set time, the AND circuit 25 outputs an output, and the faulty machine automatic series disconnection relay 26 operates to close its normally open contacts. The trip circuit of the intermediate circuit breaker 15 is energized and the failed machine is disconnected from the series. In the case of field loss, if the current value becomes smaller than that of the field loss setting device 18, a faulty machine is determined and disconnected from the series in the same manner as described above.

This also applies to the case of electromagnetic coupling field anomaly.

Furthermore, if the power for this faulty machine disconnection device is supplied from a separate battery power supply or another highly reliable power supply, the loss of field power supply is ORed to the NOT circuit 21 in the same way as the field abnormality detection input. By inputting it to the circuit 22, it can be disconnected from the series as a faulty machine.

In the above embodiment, a motor generator with an electromagnetic coupling was described, but other generators that operate in parallel may be used.

As described above, according to the present invention, the machine in which the field abnormality occurs first is regarded as the failed machine, and the field abnormality signal of the healthy machine is cut, so there is no need to worry about accidentally tripping the healthy machine during parallel operation. Nor. In addition, since faulty machines are identified and automatically disconnected from the line, it is possible to supply stable and high-quality power. Furthermore, by converting the logic control circuit configuration into a semiconductor and mounting it on a printed circuit board, the conventional AVR-? It has the advantage that it can be incorporated into AF'C, can be installed in narrow spaces, and can easily provide an inexpensive and sophisticated system.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an outline of a conventional motor generator protection device, and FIG. 2 is a block diagram showing an automatic parallel disconnection device for failed machines during parallel operation according to an embodiment of the present invention. 11: Current detector 16: Current detector 18: Field loss setter 19: Field overcurrent setter 20: Comparator 21: NOT circuit 22: NOR circuit 26: Timer 24: Memory and interlock circuit 24a: Memory set input 24b = memory reset input 25: AND circuit 26.28: Load disconnection relay 27.29: Automatic disconnection device for failed machines during parallel operation.
The same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - (and 1 other person) Procedural amendment (voluntary) Mr. Commissioner of the Patent Office], Indication of case Japanese Patent Application No. 162243/1983 2
, Name of the invention: Automatic disassembly device for failed machines for synchronous machine parallel operation 3. Person making the amendment Representative Hitoshi Katayama Department Mitsubishi Electric Corporation Name (6699) Patent attorney Shin Kuzuno
- (i17! End (Y', J21 ko Ye!: I front section) 5, Column 6 for detailed explanation of the invention in the specification subject to the amendment Contents of the amendment (1) Page 2 of the specification 15 ministries have received the “Automatic Frequency Adjuster (A
FC),” is 1 automatic frequency 1iIil unit (A
FC) 9,” is corrected. (2) "Automatic heavy pressure phase adjuster 10" on page 2, number 16 of the specification
The phrase "automatic heavy pressure regulator (AVR) 10J" is used. 4) In the 18th ladle of page 3 of the specification, replace “rotation speed” with “
Correct it as "voltage". (51 Specification 1, page 4, section I2, "periodic machine" is replaced with "
``Synchronous machine''. (6) “It happens, but in the same way (2)” in the 17th ladle of page 4 of the specification.
Correct the statement ``It happens, but also in the same way.'' (7) In the eighth column of page 6 of the specification, the phrase "abnormal signal of electromagnetic coupling 17" is amended to read "field abnormality signal of electromagnetic coupling 6." (8) On page 6 of the specification, from the 8th ministry to the 12th ministry, "electromagnetic coupling 17J" was replaced with "electromagnetic coupling 6J Nanasode Tadashi Tru〇14.

Claims (1)

[Claims] In a failure machine automatic parallel disconnection device that automatically identifies and automatically disconnects a failed machine when one of the motor generators with electromagnetic coupling has a failure during parallel operation, the field of the motor generator with electromagnetic coupling is When a field abnormality occurs in either the field current detector inserted separately in the magnetic circuit or the motor generator with electromagnetic coupling that is running in parallel, this is automatically determined and a failure is detected in the healthy machine. an interlock circuit that cuts the circuit; a confirmation timer that discriminates between abnormal operation and normal operation based on the field abnormality; If the abnormal operation continues even after the confirmation timer is activated, the motor-generator in which the field abnormality has occurred is determined to be a failure machine, and a load disconnection signal is output to control the parallel machine. Automatic disconnection device for failed machines during operation.