JPH04123734A - Breaker control device - Google Patents

Abstract

PURPOSE:To improve operational reliability, and to achieve high speed control by controlling an electromagnet operating means based on the output signal of a closing position detection means of a circuit breaker, and by carrying out the closing or the opening of the circuit breaker. CONSTITUTION:A shade 15 is moved linearly following the closing or opening operation of a circuit breaker, and when the circuit breaker is in a completely open state, the light is transmitted from an emission part 11 of a opening position detection sensor, to a light receiving part 12 thereof. When the circuit breaker is in a completely close state, the transmission light from an emission part 13 of closing position detection sensor to a light receiving part 14 is shaded. When an input switch CL is pushed in the completely open state, an electricity/ optic converter (E/O-1) 26 is made luminous until the completely close state is reached, by an output signal (f) of an AND circuit 25, through a chattering prevention amplifier 23 and a one-shot pulse oscillator 24, and an input operational GTO 32 is electrified through (O/E-1) 31 of an operational circuit 30. An electromagnetic coil 16 is electrified and a circuit breaker is closed. With this structure, operational reliability is improved, and high speed control is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a control device for a circuit breaker, and particularly to a control device configured with a non-contact circuit.

B5 Summary of the Invention The present invention provides a control device for performing closing control and breaking control of a circuit breaker, in which a means for detecting the closing position of the circuit breaker and performing the closing control and the breaking control mainly comprises:
By constructing an electronic circuit including a semiconductor element and an IC, the reliability of control operation is improved by eliminating elements that cause contact wear and contact failure, and high-speed control on the μS order is also possible.

C0 Conventional technology Conventionally, as a control means for a circuit breaker, an auxiliary switch is constructed of parts that perform mechanical operation such as an electromagnetic contactor and a limit switch, and the contact and non-contact of the contacts of this auxiliary switch are mechanically controlled. Control circuits that are controlled to turn on and off circuit breakers are often used. FIG. 4 shows an example of the configuration of a conventional control circuit of this type.

Referring to this figure, between the control buses P and N, there are push button switches 41 and 42 for closing and shutting off, and auxiliary switches 46a and 46 that open and close in conjunction with closing and shutting off the circuit breaker.
6b, a closing coil 43, and a breaking coil 44 are connected in series, and a high impedance repeat prevention relay 45 having a normally closed contact 45b is further provided on the closing side.

In this control circuit, for example, when the breaker is in the closed state, the auxiliary contact 46a is closed, so when the push button switch 42 is closed and a cutoff command is given, the cutoff coil 44 is energized by the exciting current and the cutoff is interrupted. device shutdown is performed. At the same time, the auxiliary contact 46a is opened, and the auxiliary contact 46
b is closed.

On the other hand, when the circuit breaker is in the cutoff state, the normally closed contact 46b of the auxiliary switch is closed, and the normally closed contact 45b of the repeat prevention relay 45 is also closed, so the push button switch 4
1 is closed and a closing command is given, the closing coil 43 is excited by the excitation current and the circuit breaker is closed. At the same time, auxiliary contact 46b is opened and auxiliary contact 46a is closed.

In this way, the auxiliary contacts 46a, 46b function as excitation current cutoff switches and also function as breaker status sensors.

Note that when the circuit breaker is closed by a closing command, the normally closed contact 45b of the repeat prevention relay 45 is opened, and the excitation current supplied to the closing coil 43 is significantly restricted. If the switches 41 and 42 are closed at the same time, or if the respective switches 41 and 42 continue to be closed, it is possible to prevent the circuit breaker from repeatedly closing and closing the circuit breaker.

D0 Problems to be Solved by the Invention However, in such a conventional circuit breaker control device, contact failure due to wear and oxidation of the auxiliary switch contacts 46a and 46b, breakage of movable parts due to mechanical operation, etc. If you try to use this to create a high-frequency switch that can operate in dozens of directions in a short period of time, there is a problem that the operation will become unstable and the reliability of operation will be significantly reduced. Ta.

Further, in conventional control circuits, sequence control of the circuit breaker is performed by time-series operation of movable parts, so there is a drawback that high-speed control is not possible.

The present invention has been devised in view of these problems, and aims to provide high operational reliability and
An object of the present invention is to provide a circuit breaker control device that also enables high-speed control.

E4 Means for Solving Problems In order to achieve the above object, the circuit breaker control circuit according to the present invention operates an electromagnet by turning on and off a closing command switch and a closing command switch to close and shut off the circuit breaker. A control device for a circuit breaker configured to operate the circuit breaker, comprising: an electromagnet operating means comprising a closing operation GTO and a closing holding GTO that supply a closing current and a closing holding current to the electromagnetic coil of the electromagnet; circuit breaker closing position detection means, which is provided in the circuit breaker and outputs a signal by detecting a fully closed position and a complete shutoff position of the circuit breaker; Closing control means turns on the closing operation GTO, turns off the closing operation GTO and turns on the closing holding GTO in response to a complete closing position detection signal, and outputs the complete closing position detection signal when the cutoff command switch is turned on. The present invention is characterized in that it is provided with a cutoff control means for turning off the GTO for holding the closing according to a condition.

Further, in the above configuration, the closing control means outputs the complete closing detection signal within a specified time after the closing operation GTO is turned on on the condition that the closing switch is turned on and the complete shutoff position detection signal is set. The present invention is characterized in that the GTO for input operation is turned off when the input operation is not performed.

Execute either the closing control means or the breaking control means based on the output signal of the closing position detection means of the F1 action circuit breaker, thereby controlling the electromagnet operating means to close or cut off the circuit breaker. Execute.

Each of the above means does not require electrical contact and is mainly composed of electronic circuits including semiconductor elements and ICs, so there is no element that can cause contact wear or contact failure, and high speeds on the μS order are possible. Control becomes possible.

Further, if the closing operation of the circuit breaker is not completed even after the specified time has elapsed, the closing operation GTO is turned off, thereby stopping the subsequent operation.

G. Example Examples of the present invention will be described in detail below.

FIG. 1 shows a configuration diagram of a control circuit for a circuit breaker according to an embodiment of the present invention. In this figure, reference numeral 10 denotes a switch operating section which is means for detecting the closing position of the circuit breaker; 30 indicates an electromagnet operating means and an operation circuit for operating the switch operating section 10;
Reference numeral 20 denotes a control circuit for giving closing and shutting commands to the operation circuit 30 and performing closing and shutting control of the circuit breaker.

First, Figure 1 and Figures 2 and 3 showing their structural perspective views.
The configuration of the switch operating section 10 will be explained with reference to the drawings.

In these figures, 11.13 is the light emitting part of the transmission type optical position detection sensor, and 12.14 is the light emitting part 11.1.
This is a light receiving section that is disposed at a position facing 3 and receives light emitted from each light emitting section. Further, reference numeral 15 denotes a light shielding plate, which is connected to a movable electromagnetic core 17 of an electromagnet for both charging and holding purposes. An operation link 18 for operating the circuit breaker 19 is connected to the movable electromagnetic core 17, so that the light shielding plate 15 moves linearly in conjunction with the closing and shutting operations of the circuit breaker, so that the circuit breaker is completely closed. When the power is turned off, turn it on or
A return spring (not shown) of the holding electromagnet moves it to the position shown by the solid line in FIG. 1, and when it is completely closed, it moves to the position shown by the broken line in the same figure. That is, only when the circuit breaker 19 is completely closed, light is transmitted from the light emitting section 11 of the circuit breaker 19 to its light receiving section 12, and only when the circuit breaker 19 is fully closed, the light is emitted from the closing position detection sensor. Transmitted light from the portion 13 to the light receiving portion 14 is blocked.

Next, the configuration and operation of the control circuit 20 and the operation circuit 30, which are composed of elements such as MOS-ICs, will be explained.

21 and 22 are optical-to-electrical conversion amplifiers of the optical position detection sensor, and when light is transmitted, an electric signal a is generated.

b is Low (hereinafter abbreviated as low signal), while when light is blocked, electric signals a and b are high (hereinafter abbreviated as H signal). That is, the electrical signal a becomes an H signal only when the circuit breaker is completely closed, and the electrical signal a becomes an L signal only when the circuit breaker is completely closed.

Furthermore, when the closing switch CL is pressed when the circuit breaker is completely cut off, the input signal C of the chattering prevention amplifier 23 is
changes from the L signal to the H signal, and the output signal d is held at the H signal while the switch CL is kept pressed. This output signal d is input to the one-shot pulse oscillator 24. When the input signal a is an L signal and the input signal d is an H signal, the one-shot pulse oscillator 24 outputs one pulse signal e that maintains the H signal state for a specified time, and the AND circuit 25
Enter.

The input signal of the AND circuit 25 is an L signal except when the circuit breaker is fully closed, and its output signal f is the output signal e of the one-shot pulse oscillator 24 until the circuit breaker is fully closed. is output as is, and is forcibly changed to an L signal when the signal is fully closed.

Reference numeral 26 denotes an electro-optical converter (Elo-1) that emits light only when the output signal f of the AND circuit 25 is an H signal. -1) Output to 31, GTO for input operation
32 is turned on.

When the G T O32 for closing operation becomes energized, the closing operation is performed.
Excitation current is supplied to the electromagnetic coil 16 of the holding electromagnet to close the circuit breaker. When the circuit breaker is turned on, the light shielding plate 1
5 is moved to the left in FIG. 1 in conjunction with the closing operation.

When the light shielding plate 15 moves and the light emitted to the light receiving section 12 is blocked, the output signal a of the optical-to-electrical conversion amplifier 21 becomes an H signal, and the one-shot pulse oscillator 24 no longer receives the other input signal d. . When the closing operation progresses further and reaches the complete closing state, the output signal of the optical-to-electrical conversion amplifier 22 becomes H.
Since the input signal of the AND circuit 25 becomes an H signal, the other input pulse signal e is no longer accepted, and its output signal f is forcibly changed to an L signal, which in turn causes the G T for the closing operation to be changed to an L signal. O32 is turned off to stop supplying current. The above is the process at the time of input.

Next, the operation process of holding the input will be explained.

When the circuit breaker is in the cutoff state, the input signal i of the AND circuit 27 is an L signal, and the other input signal, the output signal of the optical-to-electrical conversion amplifier 22, can be output as is. Therefore, when the circuit breaker is fully closed, the output signal of the optical-to-electric conversion amplifier 22 becomes an H signal, so the output signal of the AND circuit 27 also becomes an H signal, and the electric-to-optical converter (E
lo-2) 28. This electrical-optical converter 28
emits light only when the input signal k is an H signal, and inputs this light emission signal to the optical-to-electrical signal converter (0/E-2) 33 of the operation circuit 30 through an optical fiber, and connects the GTO 34 for closing and holding only when the light is emitted. energized. This completes the input holding.

Note that the charging/holding electromagnet requires a large attraction force at the initial stage of attracting the movable rod 17, and a large closing current flows, but a small holding current is sufficient when attraction is completed.

As described above, when the circuit breaker is completely closed and the light shielding plate 15 is completely moved to the position indicated by the broken line in FIG.
2 becomes an H signal, stops the output of the AND circuit 25, turns off the closing operation GTO 32, and at the same time,
Through this AND circuit 27, the input holding GT 034
is automatically switched on to supply a small holding current to the electromagnetic coil 16.

Next, the shutoff operation process will be explained.

When the cutoff switch OP is pressed while the circuit breaker is in the closing state, the cutoff command signal g becomes an H signal and is input to the chattering prevention amplifier 29. As a result, the output signal of the chattering prevention amplifier 29 also changes to an H signal. Since the input signal i of the OR circuit 30 becomes an R signal, its output signal i also changes from an L signal to an H signal. Here, since the input signal a of the AND circuit 31 is an H signal when the light receiving section 12 of the optical position detection sensor is shielded from light, its output signal j changes from an L signal to an H signal. is fed back to the OR circuit 30, so even if the cutoff switch OP is released, the output signal i of the OR circuit 30 maintains the H signal. This output signal i is output from the AND circuit 27
Since the input signal i becomes an H signal, the output signal of the AND circuit 27 becomes an L signal, and the light emission of the electro-optic converter 28 is extinguished, and the input holding G
TO34 is turned off and the electromagnet used for both closing and holding loses its electromagnetic force, so it is shut off by the force of the return spring. When the circuit breaker reaches the complete cutoff position, the light shielding plate 15 returns to the position shown by the solid line in FIG. Completes the state of receiving and receiving commands.

The above is a case where the circuit breaker and its operating mechanism are normal, but if the circuit breaker is not working properly for some reason, for example,
If it is not completely restored, the light shielding plate 15 blocks the light from entering the light receiving section 12, the output signal a of the optical-to-electrical conversion amplifier 21 becomes an H signal, and the AND circuit 24 receives the input command signal C. Since it does not have a receiver and does not output a signal, the circuit breaker will not be tripped.

In addition, if a closing command is given when the circuit breaker is in the complete cutoff state, and the closing operation is not completed within the specified time for some reason, the cutoff operation is started and the light shielding plate 15 The one-shot pulse oscillator 24 no longer accepts the input command signal when the light is interrupted, so when the prescribed pulse time of the one-shot pulse oscillator 24 is exceeded, the output signal e becomes an L signal, so the AND circuit 25 The output signal f also becomes an L signal, and conduction of the closing operation GTO 32 is interrupted. That is, if the closing operation is not completed within a specified time after the closing command is issued, it is determined that the circuit breaker is abnormal and the closing operation is terminated.

The above operating process is summarized in Table 1.

(Left below) However, H: H signal, L: L signal ■几: When SW is pressed, H5 When released, L Natsume 1/L
: H for the one-shot pulse setting time In this way, in this embodiment, the switch operating section 1O, the operating circuit 30, and the control circuit 20 are configured with non-contact circuits, so there is no element that could cause contact wear or poor contact. , stable performance can be obtained over a long period of time. Therefore, it becomes possible to realize a multi-frequency switch. Furthermore, since there are no delicately operating parts, there is no damage due to mechanical stress, and high reliability can be achieved.

In addition, since the control circuit 20 is constructed from a logic circuit such as a MOS-IC, and the operation circuit 30 is also constructed from a gate semiconductor element, it is possible to easily respond to complex sequence demands and to perform high-speed control on the μS order. Became.

Furthermore, if the circuit breaker does not return completely, or if the closing operation is not completed within the specified period in which the signal output from the one-shot pulse oscillator 24 maintains an H signal, it is determined that there is an abnormality in the circuit breaker. It also has a predictive maintenance function for the circuit breaker, such as stopping future operation, and has a number of other effects.

In this embodiment, a GTO is used as the gate semiconductor element of the operation circuit 30, but a GTR, MOS-FET can also be used instead.

Also, the electrical-optical converter 26, 28 and the optical-electrical converter 3
1.33 is not provided, AND circuit, output signals f and k of 27
GT O32 for direct input photography and GT for input holding.
It may be guided to O34.

Furthermore, in the control circuit 20, if the functions of the logic circuits are the same, it is also possible to set part or all of the H signal and L signal in the opposite manner to that in this embodiment.

Further, the optical position detection sensor constituting the switch operating section IO only needs to have at least two sets of light transmitting/receiving sections, and is not restricted to the configuration of this embodiment.

H9 Effects of the Invention As explained above, according to the present invention, it is possible to provide a circuit breaker control device that has high operation reliability and also enables high-speed control. A switch can be easily realized.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a control circuit of a circuit breaker according to an embodiment of the present invention, Fig. 2 is a perspective view for explaining the structure of a switch operating section of this embodiment, and Fig. 3 is a diagram of this embodiment. FIG. 4 is a schematic diagram illustrating a conventional circuit breaker control circuit. DESCRIPTION OF SYMBOLS 10... Switch operation part, 11-14... Transmission/reception part of optical position detection sensor, 15... Light shielding plate, 20...
Control circuit, 21, 22... Optical-electrical conversion amplifier, 26
, 28... Electrical-optical converter, 30... Operation circuit,
31, 33--optical-to-electrical converter, 32.34-G
T.O. a... Cutoff confirmation signal, b... Closing confirmation signal, f
... GTO gate signal for closing operation, k... GTO gate signal for closing hold, CL... Closing switch, O
P... Cutoff switch. 1 other person Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) Turn on the closing command switch and the shutting command switch,
In a control device for a circuit breaker which operates an electromagnet by turning off to close or cut off the circuit breaker, a closing operation GTO and a closing holding current are provided for supplying a closing current and a closing holding current to the electromagnetic coil of the electromagnet. an electromagnet operating means consisting of a GTO; a circuit breaker closing position detection means provided in the operation section of the circuit breaker for detecting the fully closing position and the complete closing position of the circuit breaker and outputting a signal; and the closing command switch. Closing control means that, when turned on, turns on the closing operation GTO on the condition of the complete closing position detection signal, turns off the closing operation GTO and turns on the closing holding GTO with the complete closing position detection signal, and the closing command; A control device for a circuit breaker, comprising a cutoff control means for turning off the closing holding GTO when the switch is turned on, on the condition of the fully closed position detection signal. (2) The closing control means is configured to detect when the closing switch is turned on and the complete closing detection signal is not output within a specified time after the closing operation GTO is turned on, on the condition that the complete closing position detection signal is set. The circuit breaker control device according to claim 1, wherein the closing operation GTO is turned off.