JPH07280846A - Breaker with current measuring part - Google Patents

Abstract

PURPOSE:To provide a breaker in which the current flowing through a power line can be measured easily. CONSTITUTION:At a service entrance of an external power line W, the external power line W is connected and an electric circuit is switched ON/OFF. The power line W is disconnected when an overcurrent higher than an allowable level flows. A current measuring section 10 comprising an annular magnetic core 11 surrounding an internal power line 6, a coil 12 wound around the core 11, and a measuring terminal 13 connected with the lead of the coil 12 and exposed to the outside of the case 1 is disposed while being insulated from the internal power line 6 and connected with the measuring terminal 13 thus determining the current flowing through the internal power line 6 immediately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breaker with a current measuring unit for connecting an external electric wire in an electric 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]

As described above, the conventional breaker has only a single function of opening and closing the electrical connection of the external power line W. However, in the internal and external power lines, in addition to simply opening and closing, when a current below the allowable value flows in the connected state,
Knowing how large the current value is is also an important issue in the operation, management and future design of the equipment.

In order to measure the current flowing through the power line for such a purpose, there is only a method of inserting an ammeter into the power line to be measured or sandwiching the power line with a probe of a clamp meter for measurement. However, the method of inserting an ammeter required disconnection of the connection, and measurement during operation was impossible. In the latter method of measuring across the power line,
It was difficult and inconvenient to specify the power line to be measured when there was a danger of electric shock and a large number of power lines overlapped.

It is an object of the present invention to add a current measuring section to a breaker so that the current flowing through a power line connected by the breaker can be easily measured.

The main feature of the present invention is that a current measuring unit is added to the breaker. In this respect, the breaker is different from the conventional breaker that only has an opening / closing function for connecting the power line.

[0009]

A circuit breaker with a current measuring unit according to the present invention is provided with an electric current measuring unit which is provided so as to be insulated from an internal power line and which is connected to an indicator for measuring a current flowing through the internal power line. I have.

The current measuring section has a magnetic body surrounding the power line inside the breaker, a coil wound around the magnetic body, and a measuring terminal connected to the coil. Further, the current measuring unit is composed of a hall element sandwiching an electric wire inside the breaker, a measuring terminal connected to the hall element and an exciting terminal for flowing the hall element exciting current.

A breaker unit is provided at the lead-in portion of the external power line to open and close the electric circuit by connecting the external power line and opening the connection when an excessive current exceeding an allowable amount flows in the internal power line. A plurality of magnetic poles arranged side by side, insulated from the internal power lines and surrounding each internal power line, and a coil wound around each magnetic body, and each measurement connected to these coils. The terminals are provided on the panel surface.

Further, the breaker is provided in the lead-in portion of the external power line to open and close the electric circuit by connecting the external power line and opening the connection when an excessive current exceeding the allowable amount flows in the internal power line. A plurality of units are installed side by side, insulated from the power lines, sandwiching each internal power line, each measuring element connected to each Hall element, and exciting current flowing through each Hall element. A common excitation terminal is provided on the panel surface.

[0013]

In the present invention, it is possible to immediately know the amount of current flowing through the electric power line inside the current measuring unit simply by connecting the indicator to the current measuring unit.

Further, since the current measuring section is composed of the magnetic material and the coil wound around the magnetic material, the structure is simple and the durability is high.

Further, since the current measuring section is constructed by using the Hall element, the current flowing through the power line can be detected as alternating current or direct current.

Further, since a plurality of breaker units are arranged side by side and the respective measuring terminals are provided on the panel surface,
The current of each power line can be measured at a location, and the measurement time can be shortened.

Further, since a plurality of breaker units are juxtaposed and the respective measuring terminals and the common exciting terminals are provided on the panel surface, the exciting current can be supplied to all the Hall elements by the common exciting terminals and the measurement can be performed. It's done easily.

[0018]

【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 each insulated by an insulator. The iron core 11, the coil 12, and the measuring terminal 13 constitute a current measuring unit 10. 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. 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. With such a structure, if there is an alternating current flowing through the internal power line 6, an alternating magnetic field is generated in the magnetic circuit, and the alternating magnetic field generates an electromotive force proportional to the alternating current. Occurs during. 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. [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 the Hall element 14 is provided as a current measuring unit 10 in a breaker. Assembling, two measuring terminals 13 and two exciting terminals 15 are exposed on the surface of the case 1. Here, the internal power line 6 and the Hall element 14 are electrically insulated. With such a structure, if there is a current flowing through the internal power line 6, when a predetermined current is flown through the two exciting terminals 15 in the Hall element 14 during measurement, the Hall element 14 has 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, connect a portion corresponding to the main body and display portion of the clamp meter or the Gauss meter, that is, an indicator having a function of supplying a current to the hall element 14 and a function of measuring the hall voltage to the measuring terminal 13 and the exciting terminal 15. For example, the magnitude of the current flowing through the electric circuit including the internal power line 6 can be measured. 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 at the same location, the measurement can be performed in a short time, and the work efficiency can be improved. [Embodiment 4] FIG. 5 is a view for explaining a fourth embodiment of the present invention, in which a plurality of breakers with a current measuring unit as shown in FIG. 3 are arranged in parallel in the same case 1 as a breaker unit 100. Is. In this embodiment, the current measuring unit 10
Since the hall element 14 is used in the above, the common excitation terminal 15A is provided on the panel surface 1A in addition to the measurement terminal 13. At the time of measurement, when an exciting current is passed through the common exciting terminal 15A, the Hall element 1 of each breaker unit 100 is
An exciting current flows in 4 and measurement preparation is completed. Then, by connecting an indicator to a predetermined one of the measuring terminals 13, the intended current value of the power line 6 can be known.

[0019]

As described above, in the breaker of the present invention, it is necessary to insert an ammeter in the power line for current measurement and to pinch the power line with the probe of the clamp meter by providing the current measuring section. This is a big advantage that the measurement work can be made safer, more efficient, and shorter in time.

Further, the current measuring unit has a magnetic body surrounding the power line inside the breaker, a coil wound around the magnetic body, and a measuring terminal connected to the coil, so that the configuration is simple and there is no malfunction. Durability is high with little risk of

Further, the current measuring section is composed of a hall element sandwiching the power line inside the breaker, a measuring terminal connected to the hall element and an exciting terminal for passing an exciting current through the hall element. It can be detected whether the current flowing through the power line is alternating current or direct current.

In the lead-in portion of the external power line, a plurality of breaker units are connected to connect the external power line to open and close the electric circuit, and open the connection when excessive power exceeding the allowable amount flows to the internal power line. Each has a magnetic body that is provided in parallel and is insulated from the internal power lines and that surrounds each internal power line, and a coil wound around each of these magnetic substances, and each measurement terminal connected to these coils. Since the panel surface is provided with, the passing current of each breaker unit can be measured at the same location, the measurement can be performed in a short time, and the work efficiency can be improved.

Further, at the lead-in portion of the external power line, the breaker is connected to the external power line to open and close the electric circuit and to open the connection when an excessive current exceeding the allowable amount flows to the internal power line. A plurality of units are arranged in parallel, each Hall element that is provided so as to be insulated from the internal power line and sandwiches each internal power line, each measurement terminal connected to each of these Hall elements, and the exciting current to each Hall element. Since the common excitation terminal for flowing the current is provided on the panel surface, there is an advantage that the excitation current can be supplied to all the Hall elements by flowing the current through the common excitation terminal, and the measurement can be simplified.

[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 Hall element 15 Excitation terminal 15A Common excitation terminal 100 Breaker unit

Claims (5)

[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. The breaker with a current measuring unit according to claim 1, further comprising a current measuring unit that is provided so as to be insulated from the internal power line and that connects an indicator that measures a current flowing through the internal power line. 2. The current measuring unit has a magnetic body surrounding the power line inside the breaker, a coil wound around the magnetic body, and a measuring terminal connected to the coil. Breaker with current measurement unit as described. 3. The current measuring section is composed of a hall element sandwiching a power line inside the breaker, a measuring terminal connected to the hall element, and an exciting element for passing an exciting current through the hall element. The breaker with a current measuring unit according to claim 1. 4. A breaker in a lead-in portion of an external power line, which opens and closes an electric circuit by connecting the external power line and opening the connection when an excessive current exceeding an allowable amount flows in the internal power line. A plurality of units are arranged side by side, each of which has a magnetic body that is provided so as to be insulated from the internal power lines and surrounds each of the internal power lines, and a coil wound around each of these magnetic bodies, and is connected to these coils. A breaker with a current measuring section, characterized in that each measuring terminal is provided on the panel surface. 5. A breaker in the lead-in portion of an external power line, which opens and closes an electric circuit by connecting the external power line and opening the connection when an excessive current exceeding an allowable amount flows in the internal power line. Multiple units are installed side by side,
A common terminal that has respective hall elements that are provided so as to be insulated from the internal power lines and that sandwich the respective internal power lines, and that each measuring terminal connected to each of these hall elements and an exciting current that flows through each of the hall elements. A breaker with a current measuring unit, which is provided with an exciting terminal on a panel surface.