JPS62163530A - Synchronous verification apparatus - 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 [Technical Field of the Invention] The present invention relates to a synchronization verification device used when connecting two power systems using a circuit breaker.

[Technical background of the invention and its problems] When power is cut off at a substation, multiple power systems must be connected or disconnected using circuit breakers depending on the operating conditions within and around the station. The opening and closing of the circuit breaker is controlled by operating a switch provided on the control panel. When connecting systems, it is necessary to synchronize the systems, and the synchronization is confirmed using a meter installed on the control panel before closing the circuit breaker.

FIG. 5 shows a conventional synchronization verification circuit. 1 and 2 are different power systems, and the breaker 3 can connect or disconnect these power systems. Voltmeters 7 and 8 and frequency meters 9 and 10 measure the voltage stepped down from each power system through the potential transformer 4, respectively, and the synchronization tester 11 measures the phase difference between the first power system and the second voltage system. do. If there are multiple synchronization verification systems 12 that perform synchronization verification and close the circuit breaker, use the changeover switch 6 to switch the measurement line of each meter to the secondary side of the instrument transformer of the system when operating the circuit breaker to check synchronization. ing.

In this type of synchronization confirmation and connection method.

The breaker operation switch (not shown) and the synchronization confirmation instruments 7, 8, 9, 10, and 11 described above are arranged in close proximity.

It is desirable to operate the operation switches while looking at each instrument.

However, if there are many synchronous verification lines 12,
Due to the arrangement of each device on the control panel, each instrument 7, 8, 9°10.
There are cases where it is necessary to place the operating switch of the breaker at a position away from the 11, and in this case, it is difficult to read each meter when operating the operating switch. It is also possible to place a meter close to each operation switch, but it is difficult to reduce the size of conventional mechanical pointer type meters, and due to the limitations of the control panel surface.
Its placement was difficult.

[Object of the Invention] The present invention provides a synchronization verification device that switches the voltages of a large number of synchronization verification systems and performs synchronization verification using a common synchronization verification device, in which a synchronization verification meter is installed near the operation switch of each breaker. By placing.

The purpose is to facilitate synchronization confirmation work.

[Summary of the invention] The present invention replaces conventional mechanical pointer type instruments.

By adopting an electronic meter and dividing the meter into a calculation control section and a display section, this display section can be made smaller and placed near each breaker operation switch, and the display contents can be changed according to input conditions. By automatically switching
This simplifies the verification operation during synchronous verification and improves operability.

[Embodiments of the Invention] The present invention will be described in detail below with reference to FIGS. 1 to 4.

FIG. 1 shows a schematic configuration of the present invention. 1, 2, 3.4 are the same as in FIG. The changeover switch 14, like the changeover switch 6 explained in FIG.
5, and switches the output signal to the display 16 corresponding to the breaker. Display 1
6 is the magnitude of voltage and 1 frequency.

The phase difference is divided into each mode and displayed on a display body made up of a plurality of light emitters.Since the display is divided into modes, the space required for the display unit is small.

The synchronous measurement circuit 15 is a circuit that compares the voltage magnitude and frequency 1 phase of the first power system and the second power system and outputs the results to the display 16 in different modes. Each display 16 is placed near the operation switch of the breaker 3 to facilitate synchronization confirmation.

FIG. 2 is a detailed block diagram of the synchronous measurement circuit 15, and FIG. 3 shows an example of the configuration of the display 16.

In FIG. 1, the first power system side PT secondary voltage 22 and the second power system side PT secondary voltage 2 are connected by the changeover switch 14.
3 are respectively input to the second voltage comparison circuit 172, frequency comparison circuit 182, and phase comparison circuit 19, and the calculation results are outputted to the mode selection circuit 20. The mode selection circuit 20 is a circuit that selects three types of input comparison signals according to the state of the comparison signal, and the mode selection control circuit 27 controls the selection switch 28. A voltage comparison signal and a frequency comparison signal are inputted to the mode selection control circuit 27, and when the voltage comparison signal is equal to or higher than a permissible value, that is, when the voltages between power systems are not equal, the mote selection control circuit 27 outputs a voltage comparison signal. The selection switch 28 is controlled so that when the voltage comparison signal is less than the allowable value, that is, when the power systems are equal, the mode selection control circuit 27 outputs the frequency comparison signal after a certain time limit. 28.

Furthermore, if the frequency comparison signal becomes less than the allowable value in this state, the mode selection control circuit 27 controls the selection switch 28 so as to output the phase comparison signal within a certain time limit.

In this way, output signals are output in the order of voltage 1 frequency 2 phases as the input synchronization condition is satisfied. In this way, the mode selection circuit 20 selects one of the modes of voltage 1 frequency 2 phases according to the signal contents of the inputs 22 and 23,
A mode signal 26 and a comparison signal 25 corresponding to the mode are output to the display control circuit 21.

The display control circuit 21 converts the comparison signal 25 from analog to digital and displays it together with the mode signal 26 (No. 2).
It is output to the display 16 as 4.

The display 16 has a light emitter 18 that displays a comparison signal and an indicator light 19 that displays a mode, and these are turned on and off by a light emitter control circuit (not shown) in accordance with the values of the ratio V signal and the mode signal. The light emitters 18 are 12 red.

It is a light emitting element capable of displaying two colors of green, and can emit light by selecting each color independently.

In the voltage mode, the mote indicator 19 in FIG. 3 lights up to indicate that it is in the voltage mode, and the light emitter 18 is controlled so that the light emitting elements shown with diagonal lines emit light in the red color and the others in red. Set by the circuit. The display format of the voltage comparison signal is the same as that of a balance meter.

If the voltage comparison signal is less than the allowable value, the two central light emitters will emit light;
When the voltage of the power system is higher than the second power system, the light emitters to the left of the center emit light, and vice versa, the light emitters to the right emit light. When the emitted light color is green, it means that the breaker can be turned on, and when the light emission color is red, it means that the breaker cannot be turned on.

In addition, in this voltage mode, when either power system has no voltage, the light emitters at the left and right ends emit light. That is, when the first power system has voltage and the second power system has no voltage, the leftmost light emitter emits light.

The light emitters at the left and right ends are set to emit green light, and the light emission from the light emitters at the left and right ends means that the breaker can be turned on without voltage in some cases.

Now, when the central light emitter emits light in voltage mode, the display switches to frequency mode with a time limit. In the frequency mode, F is lit on the mode indicator lamp 19, the emission color of the frequency mode is set as shown in FIG. 4, and the 1 frequency comparison signal is displayed in a balanced manner like the voltage ratio 111;1 signal. When the frequency comparison number M becomes less than the allowable value, the mode is switched to the phase mode with a time limit.

In the phase mode, the mode indicator light 19 lights up at P, and the color of the emitted light is set in the same way as in the frequency mode shown in FIG.

The display form of the phase comparison signal is such that one light emitter corresponds to a phase difference of 30°, and when the phase difference is within ±30', the central light emitter emits green light, indicating that the breaker can be turned on.

Note that the colors, shape, arrangement, etc. of the light emitters of the display can be changed arbitrarily.

When CItT is used as a display device, similar effects can be obtained in terms of simplifying the confirmation work and making identification easier. In addition to the display contents of the embodiment, it is also possible to display the value of the comparison signal as a digital value and to switch the mode manually.

[Effects of the Invention] As described above, according to the present invention, the circuit that conventionally performed synchronization verification with a pointer-type meter is configured with an arithmetic control circuit and a display using a light emitting body, and furthermore, the circuit that performs synchronization verification with a pointer-type meter is configured with an arithmetic control circuit and an indicator using a light emitting body, By adopting a method of displaying by switching the phase difference, the area required for the display can be made extremely small.Therefore, a display for synchronization verification can be placed individually near the circuit breaker operation switch that requires synchronization verification at the time of activation. It becomes possible to install the device, and operability can be improved. The display mode automatically switches to the next mode when the synchronization conditions are met, so if the synchronization conditions are met from the beginning, the phase display mode will be displayed, simplifying the confirmation content and reducing the burden of operation. ! III can be reduced. Further, by making it possible to identify whether or not the breaker is turned on by the color of the light emitted from the light emitting body, and by using a balanced display as the signal display method, there is an advantage that confirmation work can be carried out reliably and easily.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the circuit configuration of the present invention, Fig. 2 is a detailed block diagram of the synchronous measurement circuit, Figs. 3 and 4 are diagrams showing an example of the configuration of the display, and Fig. 5 is the conventional circuit configuration. FIG. 1... 1st power system, 2... 2' power system, 6.
...Selector switch, 7, 8...Voltmeter, 9,10
... Frequency meter, 11... Synchronous calibrator, 15... Synchronous measurement circuit, 1G... Display, 18... Light emitter, 19
...Mode indicator light, 20...Mead selection circuit. (7317) Agent: Patent Attorney Noriyuki Chika (
8105) King Hongbun Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A voltage comparator, a frequency comparator, and a phase comparator each detect the voltage difference, frequency difference, and phase difference of two power systems to be synchronized, and the outputs of these voltage comparators, frequency comparators, and phase comparators are A mode selection circuit selects according to the output values of the voltage comparator and the frequency comparator and outputs the selected mode signal, and the comparison signal selected by this mode selection circuit and the mode signal are input, and the mode display and A synchronization verification device comprising: a display device that displays a level according to a comparison signal.