JPH0260500A - Automatic voltage regulator device for generator - Google Patents

Abstract

PURPOSE:To improve reliability by providing a supervisory unit which detects whether or not abnormality is present in each principal constituent element of an automatic voltage regulator device. CONSTITUTION:An automatic voltage regulator device has an A-system AVR331, A-system firing unit 321, B-system AVR332 and a B-system firing unit 322. A supervisory device 50 is provided with an A-system AVR simulating circuit 511, A-system firing unit simulating circuit 541, B-system AVR simulating circuit 512 and a B-system firing unit simulating circuit 542 having a function equivalent to the A-system AVR331, A-ststem firing unit 321, B-system AVR332 and the B-system firing unit 322. An output of each circuit is compared by comparator circuits 521, 522, 54, 551, 552, 56, and abnormality in each circuit is detected being from the comparing result. By the constitution thus obtained, reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a monitoring device for an automatic voltage regulator that controls excitation of a synchronous generator.

[Conventional technology]

FIG. 3 is a diagram showing a conventional example of an automatic voltage regulator equipped with a monitoring device. In the figure, 1 is a synchronous generator, 2 is a brushless exciter, 3 is a transformer PT that detects the output voltage V of the synchronous generator 1, and 6 is a current transformer CT that detects the output current ■ of the synchronous generator 1. be. 331 is a voltage deviation detection unit (A-system AVR) on the use side, which detects the output voltage V and the reference voltage ■0
A signal is generated according to the deviation from the Reference numeral 332 denotes a voltage deviation detection section on the standby side having the same function as the voltage deviation detection section 331, and is hereinafter referred to as a B-system AVR.

321 is an A-system ignition device that creates a pulse according to the output of the A-system AVR 331, 322 is a B-system ignition device that creates a pulse according to the output of the B-system AVR 331, and 4 is a changeover switch, which is a monitoring device. 5. This monitoring device 5 includes an A-system AVR 331, an A-light ignition device 321, and a B-system A
Each signal sent out by the VR 332 and the B light ignition device 322 is detected, and if the A system becomes abnormal, a switching signal to the B system is sent to the changeover switch 4. 31 is a field controller (field rectifier) which receives ignition pulses from 1 ignition devices 321 and 322 and controls the amount of excitation of the field. 26 is a field power source.

When the deviation between the outputs of the A-system AVR 331 and the B-system AVR exceeds a predetermined value, the monitoring device 5 sends out a signal 334 informing that the A-B system AVR deviation is large, and the A-light ignition device 321 and the B-system AVR 322 When the difference between the outputs of A-B becomes more than a predetermined value,
It outputs a signal 324 that informs of a large deviation in the output of the series ignition device, and also monitors the B series AVR 332 and the B series ignition device 322, and if the deviation is less than a predetermined value, sends out a signal 341 indicating that there is no abnormality, and synchronizes. PT3 checks whether there is any abnormality in generator 1.
It is configured to monitor through the CT 6 and create a signal 361 to notify the abnormality if an abnormality is detected, and the signal 33
4 or 324 is generated, and when the signal 341 is not generated and the signal 361 is generated, a switching signal is sent to the changeover switch 4. This switching logic is shown in FIG.

[Problem to be solved by the invention] As described above, in the conventional example, the A VR 331 and the B system are connected to the VR
Since the output of the A-light ignition device 321 and the B-light ignition device 322 are compared to determine the presence or absence of an abnormality, it is possible to determine whether the abnormality is caused by an individual abnormality or not. First, there was a problem in that transient fluctuations caused malfunctions and unnecessary switching, making it impossible to supply stable power.

This invention was made to solve the above problem.
It is an object of the present invention to provide an automatic voltage regulator for a generator that can determine the presence or absence of an abnormality in each component and has higher reliability than the conventional one.

[Means to solve the problem]

In order to achieve the above object, the present invention adds a monitoring unit that monitors the presence or absence of abnormality in each voltage deviation detection section and the presence or absence of abnormality in each north ignition device.

[Effect]

In this invention, it is possible to detect failures in the voltage deviation detection unit and ignition device on the use side, and it is also possible to detect the presence or absence of abnormalities in the voltage deviation detection unit and ignition device on the standby side.
By incorporating these switching logic conditions, it is possible to prevent switching malfunctions.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 50 is a monitoring device,
331, the A-system A has the same function as the AVR.
VR simulation circuit 521 and a comparison circuit 6 that compares the outputs of both.
21. For the B-system AVR 332, a B-system AVR simulation circuit 521 having the same function as the AVR, a comparison circuit 622 for comparing the outputs of both, and the A-light ignition device 321,
A system ignition device simulation circuit 541 having the same function as the ignition device 321, and a comparison circuit 651 that compares the outputs of both;
The third feature is that the B-system ignition device W322 is provided with an A-system ignition device simulation circuit 542 that has the same function as the ignition device 321, and a comparison circuit 652 that compares the outputs of both.
This is different from the monitoring device 5 shown in the figure. 53 is A-type AVR331
and a comparison circuit for detecting the output difference between the B-system AVR 332 and the B-system AVR 332, 56
is a comparison circuit that detects the difference in output between the A light ignition device 321 and the B light ignition device 322.

In this configuration, for example, when there is no abnormality in the A-system AVR 331, the output of the comparison circuit 521 is substantially zero, but if the light-incoming AVR 331 fails, the output of the comparison circuit 521
generates a signal with a certain level, so from the generation of this signal, A
It is possible to know that a failure has occurred in the system AVR 33L. Similarly, by monitoring the outputs of the comparison circuit 522, the comparison circuit 551, and the comparison circuit 552, the B-system AVR, A
It is possible to know individually whether or not there is a failure in the light ignition device 321 and the B light ignition device 322.

Figure 2 shows an example of the A system/B system switching logic.
An abnormality occurs in the light ignition device 321, and the A system-B system A
If the VR output deviation is large or the A system-B system ignition device output deviation is large, there is no abnormality in the B system AVR 332 or B optical ignition device 322, and there is an abnormality in the synchronous generator 1, the switching signal will be activated as described above. The signal is sent to the changeover switch 4.

〔Effect of the invention〕

As described above, the present invention is provided with a monitoring unit that directly detects the presence or absence of abnormality in each of the main components of the automatic voltage regulator, so that reliability can be improved compared to the prior art.

[Brief explanation of the drawing]

Fig. 1 is a program diagram showing an embodiment of the monitoring device of the present invention, Fig. 2 is a diagram showing the switching logic in the above embodiment, Fig. 3 is a circuit diagram of a conventional automatic voltage regulator, and Fig. 4. FIG. 2 is a diagram showing the switching logic in the above-mentioned conventional example. In the figure, 1 - synchronous generator, 2 - Brass exciter, 3
1-Field controller, 501 Monitoring device, 331.332-Ignition device, 321.322-Voltage deviation detection unit, 511.5
12-Voltage deviation simulation circuit, 541.542-Ignition device simulation circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A voltage deviation detection section that detects the deviation between the output voltage of the synchronous generator and the reference voltage, and an ignition device that sends an ignition pulse to the field controller according to the output of the voltage deviation detection section. It has a series, and is equipped with a monitoring device that monitors the difference in the voltage deviation section output of both series, the difference in the ignition device output of both series, and the voltage and current of the synchronous generator, and switches to the standby series side in the event of an abnormality. An automatic voltage regulator for a generator, characterized in that the voltage regulator is further equipped with a monitoring unit that monitors the presence or absence of an abnormality in each of the voltage deviation detection units and the presence or absence of an abnormality in each of the ignition devices.