JPH07326277A - Breaker with alarm generator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a breaker that issues an alarm when the current flowing through a power line exceeds a preset value. [Structure] A breaker for connecting an external power line W to open / close an electric circuit in the lead-in part of an external power line, and for disconnecting the connection when an excessive current exceeding an allowable amount flows, The current value flowing through the power line 6 is measured by the current measuring unit 10, and when this value is equal to or more than the value preset by the allowable amount setting knob 18, the alarm lamp 15 and the alarm buzzer 16 of the alarm generating unit 14 are controlled by the control of the control unit 17. The feature is that it is activated and informs to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breaker with an alarm generator for connecting an external electric wire to an electric circuit at an external power line lead-in portion to open and close an electric circuit.

[0002]

2. Description of the Related Art A lead-in portion of an external power line has a function of a switch for connecting the external power line to open and close an electric circuit and a function of automatically opening the connection when an excessive current flows. A breaker (sometimes referred to as a circuit breaker or a no-fuse breaker) has been commonly used.

FIG. 6 is a sectional view for explaining the functional structure of a conventional breaker. 1 is a breaker case made of an insulator, 2 is a connection opening / closing switch made of an insulator, 3
Has one end protruding to the outside of the case 1 in order to connect the external power line W on one side (for example, the primary side) with a screw or the like. Conductor piece with one end protruding outside the case 1 for connecting the external power line W on the (second side) with screws or the like, 6
Is an internal power line using a flexible conductor such as a stranded wire whose one end is connected to the conductor piece 5 and the other end is connected to the conductor piece 7. One side of 7 is fixed to the connection opening / closing switch 2 and the other side is A conductor piece connected to the power line 6 and having a contact portion 8;
9 is a tightening screw. When it is not necessary to distinguish the external power line W from the internal power line 6, the power line W is simply referred to as a power line.

Due to such a structure, by moving the connection opening / closing switch 2 in one of the arrow directions shown, the contact portions 4 and 8 are in contact with each other, that is, the upper and lower external power lines in FIG. It can be set to either a state where W is electrically connected or a state where the contact portions 4 and 8 are separated, that is, a state where the connection is electrically opened. The conventional breaker also has a structure for automatically separating the contact points 4 and 8 when an excessive current flows through the internal power line 6, but it is not related to the gist of the present invention. It is omitted in 1.

[0005]

Since the conventional breaker described above is opened without notice, other devices currently in use, which are connected to the power line, are greatly affected by the stop of the power supply. In particular, in computer equipment, a serious influence is caused by destroying an operating system or invalidating a job being created. In addition, even for home electric appliances, the video tape recorder during recording and the clock function without a backup power supply may cause a trouble in daily life such as lack of recording and necessity of resetting.

The present invention has been made in order to solve the above-mentioned problems, and by providing an alarm generation unit in the breaker, the current flowing through the electric circuit connected by the breaker becomes equal to or more than a preset current value. It is an object of the present invention to provide a breaker with an alarm generation unit that has a function of issuing an alarm when it goes down.

[0007]

A breaker with an alarm generator according to the present invention is provided in a lead-in portion of an external power line for connecting the external power line to open and close an electric circuit, and to exceed an allowable amount. In the breaker that opens the connection when a large current flows through the internal power line, the current measuring unit that measures the current flowing through the internal power line, and the current value measured by this current measuring unit is the preset value or more. And an alarm generation unit that automatically generates an alarm when

Further, the alarm generator can set the current value for issuing an alarm to any value less than the allowable amount.

Further, the alarm generator is externally attached to the breaker.

[0010]

In the present invention, an alarm is issued when the current value measured by the current measuring unit exceeds the preset current value.

Further, since the alarm generation unit can arbitrarily set the current value for issuing an alarm if it is less than the allowable amount, it can be set according to the equipment used, and measures must be taken before the breaker is cut off. You can

Further, since the alarm generating portion is externally attached, it can be easily attached to the existing breaker.

[0013]

【Example】

[Embodiment 1] FIG. 1 is a first embodiment of the present invention, and FIG. 2 is a diagram for explaining the details of the main part of the current measuring portion, and the same symbols as in FIG. In these figures, 10 is a current measuring part, 11 is an iron core as a magnetic body, 12 is a coil wound around the iron core 11, and 13 is a conductor wire of the coil 12 extended to expose the tip to the outside of the case 1. This is one measurement terminal. Here, 6, 11 and 12 are insulated from each other by an insulator. These iron core 11 and coil 1
2. The current measuring unit 10 is composed of the measuring terminals 13. A combination of the iron core 11 and the coil 12 is one magnetic circuit, and in this embodiment, a portion corresponding to the probe of the clamp meter using the magnetic circuit is incorporated in the breaker as the current measuring unit 10. Reference numeral 14 denotes an alarm generation unit, which includes an alarm lamp 15 and an alarm buzzer 16,
Alarm is generated by light or sound. 17 is a control unit, 18
Is an allowable amount setting knob for arbitrarily changing the alarm current level from the outside. In the embodiment of FIG. 1 as well, as in the case of FIG. 6, the current interrupting mechanism of the breaker is omitted. This also applies to the embodiments of FIGS. 3 to 5 described later.

Next, the operation will be described. First, when the alarm level is set by the allowable amount setting knob 18, the control unit 17 stores this alarm level. In this configuration, if there is an alternating current flowing through the internal power line 6, an alternating magnetic field is generated in the magnetic circuit, and an electromotive force proportional to the alternating current is generated between the two measuring terminals 13 by the alternating magnetic field. Therefore, an electromotive force can be indicated by connecting an indicator such as a rectification type meter to these measuring terminals 13, and this is proportional to the current flowing through the internal power line 6, and therefore flows through the internal power line 6. You can know the magnitude of the current.

In the above, when the AC current flowing through the power line 6 becomes larger than the current value set by the allowable amount setting knob 18, the control unit 17 detects this and the alarm lamp 15 and the alarm buzzer 16 of the alarm generating unit 14 are detected. Is activated to generate an alarm by light or sound.

Since the power source for the current measuring section 10 is supplied from the power line, no external power source or the like is required. In addition, the current value to be set is determined in consideration of the configuration of the connected device and the margin. [Embodiment 2] FIG. 3 is a diagram for explaining a second embodiment of the present invention, in which a component corresponding to a probe of a clamp meter or a Gauss meter using a Hall element 19 is provided as a current measuring unit 10 in a breaker. Built-in, two measuring terminals 13 and two exciting terminals 20 (in FIG. 3, measuring terminal 1
I can't see because it overlaps with 3. ) And are exposed on the surface of the case 1. Here, the internal power line 6 and the Hall element 19 are electrically insulated. With such a structure, if there is a current flowing through the internal power line 6, if a predetermined current is flown through the two exciting terminals 20 to the Hall element 19 during measurement, the Hall element 19 will have an internal power line. A potential difference proportional to the value of the current flowing in 6 is generated.
This potential difference is transmitted between the two measuring terminals 13. Therefore, a portion corresponding to the main body and display portion of the clamp meter or Gauss meter, that is, an indicator having a function of supplying a current to the hall element 19 and a function of measuring the hall voltage is connected to the exciting terminal 20 and the measuring terminal 13. Then, the magnitude of the current flowing through the electric circuit including the internal power line 6 can be measured. Since the alarm operation is the same as that of the embodiment shown in FIG. 1, its explanation is omitted.

The present embodiment can be applied to the case where the current flowing through the internal power line 6 is AC or DC. [Embodiment 3] FIG. 4 is a diagram for explaining a third embodiment of the present invention, in which a plurality of breakers with a current measuring section as shown in FIG. It was done. By thus arranging them collectively, the passing current of each breaker unit 100 can be measured on the same panel surface 1A. In this embodiment, one alarm buzzer 16 is common, but since the alarm lamps 15 are provided corresponding to the breaker units 100, which breaker unit 10 is used.
It is easy to determine if the alarm is 0.

Then, the breaker with an alarm generating section issues an alarm by the alarm lamp 15 and the alarm buzzer 16.
By thus arranging them collectively, the allowable amount of passing current of each breaker unit 100 can be set and confirmed at the same location. [Embodiment 4] FIG. 5 is a view for explaining a fourth embodiment of the present invention, in which a function for issuing an alarm is externally attached to the breaker 101. In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals, 101 is a breaker, 102 is an alarm device having an alarm generator 14 inside, 21 is a display, 103 is a connector, and 104 is a cable. . The breaker 101 having the built-in current measuring unit 10 can be easily connected to the alarm device 102 from outside by a connector 103 and a cable 104. Alarm device 102
Then, the measured current value is displayed on the display unit 21, and at the same time, an alarm is issued by the alarm lamp 15 and the alarm buzzer 16 when a current more than a preset value flows.

[0019]

As described above, the breaker with an alarm generator according to the present invention is located at the lead-in portion of the external power line, connects the external power line to open and close the electric circuit, and has an excessive amount exceeding the allowable amount. In the breaker that opens the connection when a large current flows through the internal power line, the current measuring unit that measures the current flowing through the internal power line, and the current value measured by this current measuring unit is the preset value or more. Since it has an alarm generation unit that automatically generates an alarm when the above condition, it is possible to prevent accidents such as power interruptions such as exceeding the allowable amount due to new equipment connection.

Further, connected equipment (computer, etc.)
The value of the current that normally flows through the breaker differs depending on the configuration, power consumption, and the like. Therefore, if the current value for alarm generation is fixed, an alarm is generated when the current value exceeds that value. Since the alarm generation unit can arbitrarily set the alarm level by the allowable amount setting means, it is possible to set the alarm generation current value corresponding to the configuration of the device used.

Further, since the alarm generation unit is externally attached to the breaker, it can be easily applied to an existing breaker.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the configuration of a first embodiment of the present invention.

FIG. 2 is a diagram illustrating details of a main part of a current measuring unit according to the first embodiment of FIG.

FIG. 3 is a schematic sectional view showing the configuration of the second embodiment of the present invention.

FIG. 4 is a front view of a panel showing a third embodiment of the present invention.

FIG. 5 is a front view of a panel showing a fourth embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view for explaining a functional structure of a conventional breaker.

[Explanation of symbols]

 1 Case of breaker made of insulator 1A Panel surface 2 Connection open / close switch made of insulator 3 Conductor piece 4 Contact point 5 Conductor piece 6 Power line 7 Conductor piece 8 Contact point 9 Tightening screw 10 Current measuring section 11 Iron core 12 Coil 13 For measurement Terminal 14 Alarm generation part 15 Alarm lamp 16 Alarm buzzer 17 Control part 18 Allowable amount setting knob 19 Hall element 20 Excitation terminal 21 Display part 100 Breaker unit 101 Breaker 102 Alarm device 103 Connector 104 Cable

Claims (3)

[Claims] 1. A breaker in a lead-in portion of an external power line for connecting and disconnecting the external power line to open and close an electric circuit, and for disconnecting the connection when an excessive current exceeding an allowable amount flows in the internal power line. In, a current measuring unit for measuring the current flowing through the internal power line, and an alarm generating unit for automatically generating an alarm when the current value measured by the current measuring unit is a preset value or more. A breaker with an alarm generation unit characterized by having. 2. The breaker with an alarm generation unit according to claim 1, wherein the alarm generation unit can set a current value for issuing an alarm to any value less than an allowable amount. 3. The breaker with an alarm generation unit according to claim 1, wherein the alarm generation unit is externally attached to the breaker.