JPH06295653A - Circuit breaker with overcurrent relay mounted thereon - Google Patents

Abstract

PURPOSE:To output an operating state signal of a relay by providing a color sensor for discriminating a display color to output a signal for displaying an operating state of the relay. CONSTITUTION:Emitted light 27 from a light emitter 21 of a color sensor 2 is projected to a display board 82 via optical fiber 26a. When an overcurrent relay detects an overcurrent or generates abnormality therein, the display board 82 of a display unit corresponding to contents of the abnormality is reversed to display an orange color. Quantity of reflected light 27a is increased and an output signal 22a of a light receiving element becomes that of large output. An output signal 23a of a control circuit 23 becomes 'H' owing to this signal 22a, a switching circuit 24 comes into a closed state and an output signal thereof is transmitted via an auxiliary terminal group to a position apart from a position where a circuit breaker 1 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has been improved so that it is possible to confirm the display contents of a display device that displays the color of the overcurrent relay mounted on a circuit breaker at a remote location. The present invention relates to the structure of a circuit breaker equipped with a current relay.

[0002]

2. Description of the Related Art FIG. 5 shows a prior art circuit breaker equipped with an overcurrent relay having an indicator for displaying the operating state of the overcurrent relay in two different colors.
(A) is the front view, (b) is the side view. FIG. 6 is a front view of the circuit breaker-mounted overcurrent relay shown in FIG. 5.

In FIGS. 5 and 6, reference numeral 3 denotes a circuit breaker main body 4 for opening and closing the electric circuit and for cutting off the electric circuit when an overcurrent due to a short circuit flows through the circuit, and a circuit breaker main body 4 and the like. It is fixed to the pedestal 5 with wheels, the current transformer 6 that detects the value of the current flowing through the circuit breaker main body 4, and outputs a signal corresponding to the current value, and the front panel 51 of the pedestal 5. ，
The circuit breaker includes an overcurrent relay 7 having an indicator 8 for displaying the operating state of the overcurrent relay, and an auxiliary terminal group 9. Taking the case of the electrically operated circuit breaker 3 as an example, the auxiliary terminal group 9 has contacts that indicate the states of the power supply for operation, the closing operation command, the tripping operation command, and the circuit breaker open circuit and closed circuit. Each auxiliary terminal for output is installed.

To the overcurrent relay 7, a signal relating to the current value output from the current transformer 6 is input, and the value of the current flowing through the circuit breaker body 4 becomes excessive with respect to a predetermined allowable value. In this case, it is an electronically controlled device that issues a trip command to the breaker body 4. The overcurrent relay 7 is provided with a current value setting dial 71 for setting an allowable current value, a time setting dial 72 for performing time setting, an instantaneous setting dial 73 for performing instantaneous setting, and a time setting dial 74 for setting a time setting. Has been.

As shown in FIG. 7, the display 8 has a rotating shaft 81 rotatably held by a support body (not shown), and a plate-shaped display made of a permanent magnet held by the rotating shaft 81. It is composed of a plate 82, a stator 83 in which a rod-shaped body made of a soft magnetic material is formed in a U shape, and an exciting coil 84 wound around the stator 83, and is generally called a magnetic reversal type operation indicator. It is what has been. The display plate 82 is magnetized in a radial direction which is perpendicular to the holding direction of the rotating shaft 81, and has an N pole and an S pole facing each other as shown in FIG. ing. The one surface and the other surface of the display plate 82 have different colors (for example, one surface is black and the other surface is orange) by a method such as painting or attaching a coloring sheet. ) Is colored. In addition, the end portions 83a and 83b of the stator 83 have the display plate 8
The display plate 82 is arranged at a position facing the N pole and the S pole of No. 2 and has the N pole (or the S pole) of the display plate 82 → the end portion 83a → the end portion 83b →
By allowing the magnetic flux to flow through the S pole (or N pole) path of the display plate 82, the display plate 82 is held so that one surface or the other surface thereof appears on the front surface of the overcurrent relay 7.

The overcurrent relay 7 has, as the indicators 8, an indicator 8a for the R phase and an indicator 8b for the T phase for indicating which phase the phase in which the overcurrent has occurred is. , An indicator 8c that displays when the overcurrent value is in the instantaneous operation area,
The overcurrent relay 7 is provided with a display device 8d for displaying when an abnormality occurs in the internal system, and the respective display devices 8 (hereinafter, the display devices 8a to 8d may be collectively referred to as such. ) Indicates that the north pole of the display plate 82 is the stator 83
It is arranged so that the black side of the display plate 82 appears on the front surface of the overcurrent relay 7 in opposition to the end portion 83a of the overcurrent relay 7. (FIG. 7 shows this state.) In the overcurrent relay 7, when an overcurrent occurs, a trip command is given to the circuit breaker body 4, and a pulse signal for each phase in which the overcurrent occurs is sent to the overcurrent relay 7. If the value is in the instantaneous operation area, the pulse signal corresponding to it is displayed on the display 8 respectively.
a, to 8c. When an abnormality occurs in the overcurrent relay 7, a pulse signal corresponding to the abnormality is output to the display 8d. These pulse signals are passed through the exciting coil 84 of the display 8 to excite the stator 83 so that its end portion 83a becomes the N pole. As a result, the display plate 82 receives the repulsive force due to the magnetic force and thus the rotating shaft 81.
It rotates about the center and stops at the position where its S pole faces the end portion 83a. For this reason, in the display 8 which has received the pulse signal, the orange surface is the overcurrent relay 7
Therefore, it is possible to easily visually confirm the occurrence status of an accident such as an overcurrent detected by the overcurrent relay 7 from the outside of the circuit breaker 3. In addition,
In this state, in the display device 8, the magnetic flux flows through the route of the S pole of the display plate 82 → the end portion 83a → the end portion 83b → the N pole of the display plate 82, so that this display state is displayed after the disappearance of the pulse signal. Is also maintained stable.

By the way, when the accident is repaired, it is necessary to return the display plate 82 of the display unit 8 so that the original black side appears on the front surface of the overcurrent relay 7. This is done by the reset lever 77 provided in the overcurrent relay 7. A permanent magnet (not shown) is attached to the reset lever 77, and when the reset lever 77 is manually operated, the permanent magnet has a display plate 82 provided on the display unit 8.
, The display plate 82 displaying orange is forcibly rotated by magnetic force and inverted. As a result, the original black side of the display plates 82 of all the display devices 8 is located on the front surface of the overcurrent relay 7. The reset lever 77 can be released by releasing the hand from the reset lever 77.
Return to the original state by yourself.

In the overcurrent relay 7 for mounting the circuit breaker 3 having the display 8 having the structure and operation described above, the display 8
The display can be switched by a pulse signal of a small current of several hundred milliamperes, and the display can be maintained by the magnetic force of the display plate 82 made of a permanent magnet, so that the power consumption is small. It has the feature of being completed.

[0009]

In the circuit breaker equipped with the above-mentioned conventional overcurrent relay, the power consumption required for the display of the overcurrent relay can be reduced, including the switching of the display. I have the following problems: That is, when the display by the display 8 is visual and not an electrical display, it is necessary to monitor the circuit breaker 3 at a distant place apart from the place where the circuit breaker 3 is installed. In, the operating state of the overcurrent relay cannot be known every moment. In particular, when an abnormality has occurred in the internal system of the overcurrent relay 7, if the trip command is not output to the circuit breaker main body 4 or the trip command is output even if an accident occurs in the electric circuit. However, it may take a long time until a command is output, and there is a high risk of causing a ripple accident. Therefore, it is a big problem that the accident information cannot be known at a distant place such as a centralized monitoring room.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide an overcurrent relay having an indicator for displaying an operating state in two different colors while providing an overcurrent relay. An object of the present invention is to provide a circuit breaker equipped with an overcurrent relay that can output the operating state of the relay as an electric signal.

[0011]

SUMMARY OF THE INVENTION In the present invention, the above-mentioned objects are as follows: 1) A circuit breaker for opening and closing an electric circuit and for interrupting the electric circuit when an overcurrent due to a short circuit flows through the circuit. An overcurrent relay that sends a trip command to a circuit breaker when an overcurrent condition occurs in the current flowing therethrough, and this overcurrent relay has an indicator that displays its operating state in two different colors The circuit breaker equipped with an overcurrent relay, which has a color sensor that determines the color displayed by the indicator of the overcurrent relay and outputs an electric signal indicating the operating state of the overcurrent relay, is configured. Achieved by.

[0012]

According to the present invention, the breaker equipped with the overcurrent relay is provided with the color sensor for discriminating the color displayed by the indicator of the overcurrent relay and outputting the electric signal indicating the operating state of the overcurrent relay. According to the configuration, the color sensor discriminates the color that becomes different depending on the operating state of the overcurrent relay displayed by the display, and according to the color displayed by the display, the operation of the overcurrent relay is accordingly determined. It outputs an electric signal according to the state. By using this electric signal, it becomes possible to know the accident information at a distant place apart from the overcurrent relay.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings. 2A and 2B show a circuit breaker equipped with an overcurrent relay according to an embodiment of the present invention. FIG. 2A is a front view thereof, and FIG. 2B is a side view thereof. FIG. 3 shows FIG.
4 is a sectional view taken along line AA in FIG. 4A, FIG. 4 is a view taken in the direction of arrow P in FIG. 3, and FIG. 1 is a schematic configuration diagram of the color sensor shown in FIG. 1 to 4, in FIGS.
The same parts as those of the circuit breaker equipped with the overcurrent relay according to the conventional example shown in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted.

1 to 4, reference numeral 1 is provided with a color sensor 2 in addition to a conventional circuit breaker 3 having an overcurrent relay, and an auxiliary terminal group 9A instead of the auxiliary terminal group 9.
It is a circuit breaker provided with. The color sensor 2 includes a light emitter 21 and
Photoreceptor 22, control circuit 23, and switching circuit 24
Color sensor body 28 having two and two-core optical fiber 25
Is equipped with. The light-emitting body 21 emits visible light of a single color (for example, green or red), and for example, a light emitting element or the like is used. The optical fiber 25 is a light emitter 21.
The emitted light 27 which is a monochromatic visible light emitted from the display 8
The optical fiber 26a for emission that transmits to the part of the display plate 82 provided in and the optical fiber 26b for reception that returns the reflected light 27a in which the emitted light 27 is reflected on the surface of the display plate 82 are provided. The flexible sheath material is used for protection.

The photodetector 22 is sensitive to light in the visible light range and emits light 27 returned from the optical fiber 26b.
The reflected light 27a corresponding to is received, and the electric signal 22a corresponding to the amount of the light is output, and an appropriate light receiving element is used. The control circuit 23 inputs the electric signal 22a and outputs an operation signal 23a in response to the electric signal 22a, and outputs a lighting signal to a not-shown indicator lamp in response to the operation signal 23a or causes the light emitter 21 to emit light. It is a circuit that outputs a lighting signal to a not-shown indicator when in the state, and is configured by, for example, an electronic circuit. The switching circuit 24 receives the operation signal 23a and is opened / closed according to the operation signal 23a, and is, for example, an electronic switch.

A light emitting body 21, a light receiving body 22, a control circuit 23,
The switching circuit 24 is integrally housed in a storage case to form a color sensor body 28, and the optical fiber 25 penetrates the wall surface of the storage case of the color sensor body 28 to the outside of the color sensor body 28. It is configured to be arranged. The color sensor main body 28 is provided with a power supply terminal 28a for an auxiliary power supply, a common terminal 28b, and an open / close output terminal 28c. Auxiliary power is supplied to the power supply terminal 28a from a device for auxiliary power supply (not shown), and this auxiliary power is supplied to the light emitter 21, the light receiver 22, the control circuit 23, the switching circuit 24 and the like. The signal generated by opening / closing the switching circuit 24 is an electric signal and is supplied between the common terminal 28b and the opening / closing output terminal 28c.

By the way, as the color sensor 2, the color sensors 2a and 2d are installed for the respective display devices 8a and 8d. Color sensor 2 (hereinafter, color sensor 2a, ...
When 2d is generically called, it may be said in this way. )
The color sensor main body 28 of is attached to a position near the overcurrent relay 7 on the back surface side of the front panel 51, preferably in a place which is a dead space. Optical fibers 25a, 25d of the respective color sensors 2a, 2d
Is drawn out from the through hole 51a provided in the front panel 51 to the front surface side of the front panel 51, and each display 8a, 8
It is laid down to the part of the display plate 82 included in d. Each optical fiber 25 (hereinafter optical fibers 25a, to 25
When generically calling d, it may be said in this way. The end portion of) is held by the fixing plate 29 so that the end surface of the optical fiber 25 faces the display plate 82 included in each of the display devices 8a to 8d. The fixing plate 29 is formed by forming a thin plate into a substantially Z-shape and is mounted on the surface side of the overcurrent relay 7 by an appropriate mounting method such as screwing, and at a position for holding the optical fiber 25, A through hole for penetrating the optical fiber 25 is formed. An appropriate material can be used for the fixing plate 29. However, if a transparent material is used, the display color of the display plate 82 included in the display 8 is visually monitored even though the color sensor 2 is mounted. Bring the benefits that make it possible.

In the auxiliary terminal group 9A, in addition to the auxiliary terminals of the auxiliary terminal group 9 of the circuit breaker 3 of the conventional example, auxiliary terminals to which the common terminal 28b of each color sensor 2 and the switching output terminal 28c are connected are installed. It was done. Therefore, the signal generated by opening / closing the switching circuit 24 can be taken out of the circuit breaker 1 from the auxiliary terminal of the auxiliary terminal group 9A.

Since the present invention has the above-mentioned configuration, the emitted light 27 emitted from the light receiving body 22 of the color sensor 2 is
The light is transmitted through the emission optical fiber 26a and emitted from the end face toward the display plate 82. When the circuit breaker 1 is in a normal operating state and the black side of the display plate 82 appears on the front side of the overcurrent relay 7, as is well known on the black side, light in the visible light range is emitted. Most of the emitted light 27 is absorbed by the display plate 82 because it has a property of absorbing well. Therefore, the reflected light 27 incident on the light receiver 22 is
The light quantity of a is small. The light receiver 22 is sensitive to light in the visible light region and is not affected by infrared rays or the like, and therefore operates according to the amount of the reflected light 27a. Therefore, the reflected light 27a
In this case, the electric signal 22a output from the light receiving body 22 has a small output. The operation signal 23 output from the control circuit 23, which receives the electric signal 22a of small output
a becomes a low level. The switching circuit 24 receiving the low-level operation signal 23a is in the open state. The electrical signal output from the switching circuit 24 in the open circuit state is taken out from the auxiliary terminal group 9A to the outside of the circuit breaker 1 and transmitted to a centralized monitoring room or the like which is distant from the place where the circuit breaker 1 is installed. It

In this state, when the overcurrent relay 7 detects an overcurrent or an abnormality occurs in the internal system of the overcurrent relay 7, the indicator 8 corresponding to the content of the abnormality is displayed.
The display plate 82 of a and 8d is inverted, and its orange side appears on the front side of the overcurrent relay 7. As is well known, the orange surface has a property of not absorbing light rays in the visible light region so much that the amount of the reflected light 27a reflected by the display plate 82 is significantly larger than that of the black surface. Increase. Since the reflected light 27a having a large amount of light is input, in this case, the electrical signal 22 output from the light receiver 22 is input.
a has a large output. After that, a large output electrical signal 22
Operation signal 23a output from the control circuit 23 when a is input
Becomes a high level, and the switching circuit 24 to which the high-level operation signal 23a is input changes to the closed state, and the electric signal output from the switching circuit 24 in the closed state is output via the auxiliary terminal group 9A. 1 is transmitted to a place away from the place where it is installed. Thus, it is possible to immediately grasp the content of the abnormality displayed on the overcurrent relay 7 even at a distant place.

By the way, in the case of a circuit breaker equipped with an overcurrent relay, not all of them are subject to remote monitoring, and therefore, a circuit breaker equipped with an overcurrent relay which does not require a color sensor is manufactured. It In this situation,
As a method of obtaining a circuit breaker equipped with an overcurrent relay capable of outputting an electric signal for remote monitoring, a pulse signal given to the display 8 (this pulse signal is a weak current as described above, is not suitable for remote monitoring. It is appropriate, and it is also not possible to operate the auxiliary relay.) It is assumed that the auxiliary relay is activated after amplifying the signal), or that it is converted into a continuous signal of sufficient current value. However, in this case, since it is necessary to add an amplifier circuit, an auxiliary relay, a power amplification element, or the like to the overcurrent relay 7, a new overcurrent relay is required. On the other hand, in the case of adopting the color sensor 2 of the present invention described above, the overcurrent relay 7 does not have an electric signal for remote monitoring, although the circuit breaker main body 4 is a matter of course. The same circuit breaker 3 having the overcurrent relay according to the example can be used as it is, and the pedestal 5 and the auxiliary terminal group 9 can be handled with a minimum change. This allows
It also has the advantage of enabling standardization by common use of these parts.

In the above description of the embodiment, the color displayed by the display unit 8 is black when the circuit breaker 1 is in a normal operating state, and the color displayed by the display unit 8 is abnormal when an abnormality occurs. Although the color has changed to orange, the color is not limited to this, and an appropriate color can be adopted. In the above description of the embodiment, the switching signal output from the switching circuit 24 is the open circuit when the circuit breaker 1 is in the normal operating state, and the closed circuit when the abnormality occurs. It is not limited to this, for example,
There is no problem even if the relationship is reversed.

[0023]

According to the present invention, as described above, the breaker having the overcurrent relay is provided with the color sensor, and the color sensor corresponding to the display color of the display which is different depending on the operating state of the overcurrent relay outputs. The electric signal to be used is made available. As a result, even in a distant place away from the circuit breaker such as the centralized monitoring room, the accident information or the details of the abnormality can be immediately grasped, and it is possible to take appropriate measures in response to the abnormality without delay. , And a circuit breaker equipped with an overcurrent relay equipped with the color sensor
It is possible to share the main parts with the circuit breaker equipped with an overcurrent relay that does not require an electrical signal corresponding to the operating state of the overcurrent relay, and this makes it possible to correspond to the operating state of the overcurrent relay. There is an effect that it becomes possible to reduce the manufacturing cost of a circuit breaker equipped with an overcurrent relay that can output an electric signal.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing the color sensor shown in FIG. 2 together with related devices.

2 shows a circuit breaker equipped with an overcurrent relay according to an embodiment of the present invention, (a) is a front view thereof, FIG.
(B) Side view

FIG. 3 is a sectional view taken along line AA in FIG. 2a.

FIG. 4 is a view on arrow P in FIG.

5A and 5B show a circuit breaker according to the related art equipped with an overcurrent relay, in which FIG. 5A is a front view thereof, and FIG. 5B is a side view thereof.

6 is a front view of the circuit breaker-mounted overcurrent relay shown in FIG.

FIG. 7 is a perspective view schematically showing the configuration of a display device.

[Explanation of symbols]

 1 breaker 2 color sensor 21 light emitter (light emitting element) 22 light receiver (light receiving element) 22a electric signal 23 control circuit 23a operation signal 24 switching circuit 25 optical fiber 26a optical fiber 26b optical fiber 27 outgoing light 27a reflected light 28 color sensor Main unit 28b Common terminal 28c Switching output terminal 7 Overcurrent relay 8 Display

Claims (1)

[Claims] 1. A circuit breaker that opens and closes an electric circuit and interrupts the electric circuit when an excessive current flows due to a short circuit in the electric circuit, when an overcurrent condition occurs in the current flowing through the circuit breaker. Is equipped with an overcurrent relay that issues a trip command to the circuit breaker, and this overcurrent relay has an indicator that displays its operating state in two different colors. A circuit breaker equipped with an overcurrent relay. 2. A circuit breaker equipped with an overcurrent relay, comprising a color sensor for determining a color displayed by an indicator of the overcurrent relay and outputting an electric signal indicating an operating state of the overcurrent relay.