JPH0125400Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an operation display device for a circuit breaker, and in particular, when a circuit breaker whose tripping is controlled by an electronic circuit with a small signal output trips, for example, an overload, It is designed to display tripping operation areas such as short circuits and leakage.

When a circuit breaker trips, if it can be determined in which area the tripping operation occurred, such as overload, short circuit, or leakage, it will be easier to investigate the cause of the accident and speed up recovery work. There are advantages. Therefore, there has been a strong demand for a display device that can display the tripping operation range of a circuit breaker.

Therefore, the main purpose of this invention is to provide a display device that can satisfy the above-mentioned demands.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

FIG. 1 is a schematic circuit diagram showing an embodiment of this invention. In the figure, an electric line 1 connecting the power supply and load in the main circuit includes a tripping coil 1, which will be described later.
A circuit breaker 2 is inserted which is tripped by 2. The electric line 1 is provided with a current transformer 3 for detecting the current flowing through the electric line 1. The current detected by this current transformer 3 is transmitted to a rectifier circuit 4.
is applied to and taken out as a direct current. The direct current from the rectifier circuit 4 is divided into a control power supply circuit 5, a long-time tripping detection circuit 6, a short-time tripping detection circuit 7, and an instantaneous tripping detection circuit 8, respectively.
Then, in the control power supply circuit 5, a DC voltage is generated using the shunted DC current, and is used as a power source for energizing a tripping coil 12 and excitation coils 15 and 18, which will be described later. That is, the control power supply circuit 5
The + side of is the tripping coil 12 and the thyristor 11
It is connected to one side of the control power supply circuit 5 via. The tripping coil 12 trips the circuit breaker 2 when energized. Further, a series circuit composed of an excitation coil 15 and a phototransistor 14 is connected in parallel to the series circuit composed of the tripping coil 12 and the thyristor 11. Similarly, a series circuit made up of an excitation coil 18 and a phototransistor 17 is connected in parallel to the series circuit made up of the tripping coil 12 and the thyristor 11. These excitation coils 15 and 18 are coils for driving a display device to be described later.

On the other hand, the long time trip detection circuit 6 is connected to the rectifier circuit 4.
When the direct current from the controller exceeds a predetermined long-term setting value, a tripping operation signal is output. The tripping operation signal from this long time tripping detection circuit 6 is
It is applied to the gate of thyristor 11 via OR gate 9. Similarly, the short-time trip detection circuit 7 and the instantaneous trip detection circuit 8, respectively, when the DC current given from the rectifier circuit 4 exceeds a predetermined short-time setting value and instantaneous trip value,
Outputs a tripping operation signal. Each of these tripping operation signals is applied to an OR gate 10. This OR
The output of gate 10 is applied to the gate of thyristor 11 via OR gate 9. Thyristor 1
1 is turned on in response to a tripping operation signal from any one of the long-time tripping detection circuit 6, the short-time tripping detection circuit 7, and the instantaneous tripping detection circuit 8. In response, current flows through the tripping coil 12 and the tripping coil 12 is energized. The circuit breaker 2 is then tripped.

Further, the output of the long-time tripping detection circuit 6 is applied to one side of the control power supply circuit 5 via the light emitting diode 13. Therefore, when a tripping operation signal is output from the long time tripping detection circuit 6, the light emitting diode 13 emits light. This light emitting diode 13
constitutes a photocoupler in cooperation with the phototransistor 14 described above. Therefore, the phototransistor 14 is turned on by the light emission from the light emitting diode 13, and the excitation coil 15 is energized. This activates the display device including the excitation coil 15, indicating that the circuit breaker has tripped after a long period of time.

Similarly, the output of the OR gate 10, that is, the output of the short-time trip detection circuit 7 or the instantaneous trip detection circuit 8, is applied to one side of the control power supply circuit 5 via the light emitting diode 16. light emitting diode 1
6 constitutes a photocoupler in cooperation with the aforementioned phototransistor 17. Therefore, the light emitting diode 16 emits light and the phototransistor 17 is turned on by the tripping operation signal from the short-time tripping detection circuit 7 or the instantaneous tripping detection circuit 8. In response, the excitation coil 18 is energized, and the excitation coil 1
8 is driven. By this,
It is indicated that the circuit breaker has tripped in the short circuit area.

Note that the power source for energizing the excitation coils 15 and 18 may be provided separately from the control power source circuit 5.

2 to 5 are diagrams showing the configuration of a display device according to an embodiment of the present invention, in particular, FIG. 2 shows a front sectional view, and FIG. 3 shows a right side view with a part of the housing cut away. FIG. 4 is a plan view with the housing removed, and FIG. 5 is an exploded perspective view. Hereinafter, a display device according to an embodiment of this invention will be described with reference to FIGS. 2 to 5.

A U-shaped fixed yoke 22 made of a magnetic material is fixed to the substrate 21 . A rectangular hole 22 a is formed on one side of the fixed yoke 22 . One end side of the movable iron piece 23 is inserted into this rectangular hole 22a. This allows the movable iron piece 23 to form the rectangular hole 22a.
It is rotatably supported around the center. Further, a permanent magnet 26 is provided on one side of the fixed yoke 22, and a micro switch 33 is provided on the surface opposite to the surface on which the permanent magnet 26 is provided. On the other hand, a coil bobbin 24 is provided on the other side of the fixed yoke 22. That is, the coil bobbin 24
The other side of the fixed yoke 22 is inserted into a yoke insertion hole 24a provided approximately in the center of the yoke. An excitation coil 25 corresponding to excitation coil 15 or 18 shown in FIG. 1 is wound around this coil bobbin 24.

Furthermore, a center opening hole 24b is formed in the center of the coil bobbin 24. In the movable iron piece 23, an opening hole 23a is also formed in a portion facing the central opening hole 24b of the coil bobbin 24.

The display knob 27 includes a head portion 28a, a collar portion 28b, and a leg portion 29. The leg portion 29 is inserted through the opening hole 23a of the above-mentioned movable iron piece 23, and is inserted into the coil bobbin 24.
through the central opening hole 24b. Thereby, the display knob 27 is provided so as to be able to move vertically using the coil bobbin 24 as a guide.

Each member described above is housed inside a housing 30 that covers the substrate 21. At the top of this housing 30, there is a head 28a of the display knob 27.
A hole 30a is formed so that it can protrude to the outside. Further, a return spring 31 is provided between the housing 30 and the flange portion 28 of the display knob 27, passing through the head portion 28a. By this,
Usually, the head 28 of the display knob 27 is connected to the housing 30.
It is configured so that it does not protrude from the hole 30a. Further, a tripping spring 32 is provided between the housing 30 and one end of the movable iron piece 23. This tripping spring 32 is connected to the movable iron piece 23
gives a constant clockwise moment to .

In operation, the head 28a of the now display knob 27
, protrudes from the hole 30a of the housing 30, as shown by the two-dot chain line in FIG. In this state, when the head 28a of the display knob 27 is pushed down, the movable iron piece 23 moves through the rectangular hole 22 of the fixed yoke 22.
The fixed yoke 22 is pushed down in the other direction centering on a. When the movable iron piece 23 comes into contact with the upper end of the other side of the fixed yoke 22, the counterclockwise moment based on the magnetic flux generated by the permanent magnet 26 overcomes the clockwise moment due to the tripping spring 32, and the movable iron piece 23 is fixed. It is sucked into the yoke 22 and held at the suction position. In this state, when a tripping operation signal is applied to the excitation coil 25, the excitation coil 25 generates magnetic flux in a direction that cancels the magnetic flux generated by the permanent magnet 26. Therefore, the movable iron piece 23 is rotated clockwise by the action of the tripping spring 32 to push the collar portion 28 up against the display knob 27. Therefore, the head 28 of the display knob 27
a protrudes outward from the hole 30a of the housing 30 (see the two-dot chain line in FIG. 2), indicating that the circuit breaker has tripped. Note that since the elastic force of the tripping spring 32 is selected to be greater than the elastic force of the return spring 31, the head 28a of the display knob 27 is held while protruding to the outside.

As mentioned above, when the movable iron piece 23 is released,
Since one end of the movable iron piece 23 rotates in the direction of the microswitch 33, the actuation button 34 of the microswitch 33 is pressed. Therefore, electrical signals can be extracted from the contacts of the microswitch 33 to operate remote display devices and other control equipment.

Note that by pushing the head 28a of the display knob 27 protruding outward from the housing 30 into the housing 30, the display state is easily canceled.

The embodiment of the invention described above has many advantages as described below.

That is, (1) the tripping operation range of the circuit breaker can be easily determined depending on which display device among the plurality of display devices displays the trip of the circuit breaker; This has the advantage of making it easier to investigate the cause of an accident and speeding up recovery work.

(2) Normally, the long-time tripping detection circuit 6, the short-time tripping detection circuit 7, the instantaneous tripping detection circuit 8, etc. are constituted by electronic circuits, so their outputs are small signals. However, since the movable iron piece 23 in the display device is given a counterclockwise moment by the permanent magnet 26 and a clockwise moment by the tripping spring 32, it is difficult to rotate the movable iron piece 23 clockwise. The current applied to the excitation coil 25 for displaying may be very small. Therefore, there is an advantage that even a small tripping operation signal can be reliably displayed.

(3) In addition, since the display device mechanically holds the display knob 27 in the display position and continues the display state even after the tripping operation signal disappears, the circuit breaker operates as a power source for the display device. Power sources can be shared. Therefore, there is an advantage that the circuit configuration can be simplified.

(4) In the display device, the micro switch 33 is operated using the release action of the movable iron piece 23, so if the contact signal of this micro switch is taken out to the outside, the operation can be displayed at a remote location, and the monitoring point can be monitored. It has the advantage of being able to be expanded. Another advantage is that other control equipment can be operated by the contact signal of the microswitch 33.

Note that the display device does not need to be provided individually for all tripping areas of the circuit breaker. For example, a display device may be provided only in an operating area that could immediately lead to a major accident, such as a short-circuit area.

As described above, according to this invention, the operating range of a circuit breaker that can operate in a plurality of operating ranges can be displayed, making it easy to investigate the cause of an accident and quickly carry out recovery work. Furthermore, even if, for example, an electronic circuit with a small signal output is used as a means for outputting the tripping operation signal, the display can be performed reliably.

[Brief explanation of the drawing]

FIG. 1 is a schematic circuit diagram showing an embodiment of this invention. 2 to 5 are diagrams showing the configuration of a display device according to an embodiment of the invention, with FIG. 2 showing a front sectional view and FIG. 3 showing a right side view with the housing 30 partially cut away. Figure 4 shows the housing 3.
5 is a plan view with 0 removed, and FIG. 5 is an exploded perspective view. In the figure, 2 is a circuit breaker, 6 is a long time tripping detection circuit, 7 is a short time tripping detection circuit, 8 is an instantaneous tripping detection circuit, 12 is a tripping coil, 15,
18 and 25 are excitation coils, 22 is a fixed yoke, 23 is a movable iron piece, 26 is a permanent magnet, 27 is a display knob, 30 is a housing, 31 is a return spring, 32 is a tripping spring, and 33 is a micro switch.

Claims (1)

[Claims for Utility Model Registration] (1) A means for detecting the value of current flowing through the main circuit, and a means for receiving the output of the detecting means as an input signal, each of which is configured and operated at a different input signal level. A circuit breaker comprising: a plurality of tripping signal generating means for generating a tripping signal instantaneously or after a predetermined delay time; and means for interrupting the main circuit in response to the tripping signal. A display device for displaying that the circuit breaker has cut off the main circuit based on at least one tripping operation signal from the plurality of tripping operation signal generating means, comprising: a housing; a fixed yoke provided; a movable iron piece rotatably supported so as to be in contact with the fixed yoke; an elastic member that constantly biases the movable iron piece and separates the movable iron piece from the fixed yoke; a permanent magnet for attracting the movable iron piece to the fixed yoke against the elastic force of the elastic member; an excitation coil that is biased to generate a magnetic flux in a direction opposite to the magnetic flux generated by the permanent magnet; , and an indicator knob provided so that at least a portion thereof protrudes to the outside from the cover when the movable iron piece is released, and the excitation coil is given the tripping operation signal, thereby causing the permanent magnet to An operation display device for a circuit breaker, characterized in that the movable iron piece that has been attracted to the fixed yoke is released and the display knob protrudes from the cover to display the operation of the circuit breaker. (2) A microswitch is provided which is activated by the release operation of the movable iron piece.
A circuit breaker operation display device according to claim 1 of the utility model registration claim.