JP4129932B2 - Current sensor structure for clamp sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Even when a gap is present between the butted ends of the current coils that are in contact with each other when the clamp sensor formed to be openable and closable, the present invention suppresses adverse measurement effects from the gap. The present invention relates to a current sensor structure for a clamp sensor.
[0002]
[Prior art]
A clamp-type ammeter equipped with a clamp sensor that can be freely opened and closed is widely used in various fields since it can measure the current value by directly introducing the conductor to be measured into the clamp sensor. Has been.
[0003]
[Problems to be solved by the invention]
However, in the clamp type ammeter, it is inevitable from the structure that a gap is generated between the butt ends of the current sensor when the clamp ammeter is closed, and after the conductor to be measured is introduced into the clamp sensor. When measuring the measured conductor near the gap, the measured current value may be displayed lower than the true value, so that the measured conductor after being introduced into the clamp sensor is separated from the butt end. There was a troublesome measurement that had to be measured.
[0004]
SUMMARY OF THE INVENTION In view of the above-mentioned problems found in the prior art, the present invention provides a clamp sensor that can measure with a reduced measurement error regardless of the position of the conductor to be measured introduced into the clamp sensor. It is an object to provide a current sensor structure.
[0005]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above objects, features on its configuration constitutes a clamp sensor comprising a left sensor part and a right sensor part, which is axially supported to be openable and closable to the instrument body, and In a pair of current sensors that are substantially annular when closed and are arranged to be in direct or indirect contact with each other through the respective butted ends , a winding is wound around an insulating hollow tube. In each of the pair of current sensors formed by applying, the butt end portions positioned at the base end portion and the tip end portion are formed by the crushing portions that are alternately overlapped and abutted when closed .
[0006]
In this case, the current sensor is preferably a Rogowski coil.
[0007]
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention constitutes a clamp sensor composed of a left sensor part and a right sensor part pivotally supported by an instrument main body so as to be openable and closable, and becomes a substantially annular shape when closed, via each butted end part. This is applied to a pair of current sensors in which direct or indirect contact with each other is freely arranged.
[0009]
FIG. 1 is an explanatory diagram showing the manufacturing process as an example of a current sensor as (a) to (c). A current sensor 11 formed by applying a winding 22 to an insulating core material 17 is as follows. By passing through the process, the large diameter parts 15 and 16 which make the outer diameter of the site | part in which each butt | matching edge parts 12 and 13 are located larger than the outer diameter of another site | part can be provided.
[0010]
That is, as shown in FIG. 1 (a), for example, a hollow tube 18 having a uniform outer diameter made of flexible and soft vinyl chloride is used as a core material 17, and its base end portion 18a and tip end portion 18b After the heat-shrinkable tube 21 is attached to form the thick portions 19 and 20, the winding 22 is applied to the peripheral surface over the entire length of the hollow tube 18 including these thick portions 19 and 20, whereby As shown in (b), it is possible to form the flexible coil body 14 which has the large diameter portions 15 and 16 at the base end portion 18a and the start end portion 18b and is linear. In this case, the thick portions 19 and 20 can be formed by, for example, winding an insulating tape or applying an insulating paint in addition to the heat shrinkable tube 21.
[0011]
The flexible coil body 14 formed in this way is provided with flexibility that can be bent and deformed as a whole, so that the flexible coil body 14 is substantially semicircular as shown in FIG. The current sensor 11 having the large-diameter portions 15 and 16 at the butt end portions 12 and 13 can be formed by making the bending extremely easy. The current sensor 11 can be used as a Rogowski coil.
[0012]
The current sensor 11 is separately stored in a left holder part and a right holder part (not shown) prepared in advance to form a left sensor part and a right sensor part, and the left sensor part and the right sensor part are connected to the instrument body. A clamp sensor can be formed by pivotally supporting it in an openable and closable manner. In addition to the hollow tube made of vinyl chloride, the core material 17 can be a hollow tube made of a hard insulating resin that is curved in a predetermined shape in advance, or a bobbin material having a magnetic core. You can also. When a hollow tube or bobbin material made of an insulating resin is used as the core material, the thick portions 19 and 20 can be integrally formed of the same resin material, and a heat shrinkable tube can be attached or insulated. It can also be formed by winding a tape or applying an insulating paint.
[0013]
In addition to the illustrated example, the large diameter portions 15 and 16 can be formed by increasing only the number of windings of the base end portion and the tip end portion of the core material with a uniform outer diameter, The thickness of the material itself may be the same, and only the outer diameters of the base end portion and the tip end portion may be increased.
[0014]
The present invention is applied to a pair of current sensors formed by winding a soft hollow tube such as a vinyl chloride tube, and can be suitably used particularly as a Rogowski coil.
[0015]
Figure 2 illustrates an example of the onset bright, the current sensor 31, after applying the hollow tube 18 wound around 32 consisting of vinyl chloride tube is indicated, for example, in Figure 1, a base end portion 31a It is formed by providing crushing portions 34 and 36 at the butt end portions 33 and 35 positioned at the tip portion 31b.
[0016]
In this case, the crushing portions 34 and 36 included in the current sensor 31 are crushed so that the pair of current sensors 31 and 31 disposed opposite to each other can be alternately overlapped with each other when they are closed. Is formed.
[0017]
That is, of the crushing parts 34 and 36 included in the current sensor 31, the crushing part 34 located on one side, for example, the base end part 31 a side, pushes the back side to the front side to the extent that the thickness is approximately half. By crushing, the crushing part 36 located on the other side, for example, the tip part 31b side, is crushed by crushing the front side to the back side direction to about half the thickness opposite to the crushing part 34, respectively. Is formed.
[0018]
The pair of current sensors 31 and 31 formed in this way are arranged so that one side and the other side are turned upside down and arranged opposite to each other as shown in FIG. The crushing part 34 of one current sensor 31 is the crushing part 35 of the other current sensor 31, and the crushing part 35 of one current sensor 31 is the crushing part 34 of the other current sensor 31 as shown in FIG. , Each can be alternately overlapped with each other in the front-rear direction to be brought into contact with each other.
[0019]
Figure 3 is a front view showing another example of the present onset bright, crush portions 34, 36 of the current sensor 31 is provided is that both crushing the lower surface to the extent that substantially the thickness of the half to the upper surface side direction It is formed by.
[0020]
The pair of current sensors 31, 31 formed in this way is arranged so that one side and the other side are turned upside down and arranged opposite to each other as shown in FIG. The crushing part 34 of the sensor 31 is a crushing part 35 of the other current sensor 31, and the crushing part 35 of one current sensor 31 is alternately overlapped with the crushing part 34 of the other current sensor 31. It can be made to contact.
[0021]
Since the present invention is configured as described above, the winding tube 32 is applied to the hollow tube 18 as shown in FIG. 1, and the butt end portions 33a and 33b positioned at the proximal end portion 31a and the distal end portion 31b are provided. The current sensor 31 provided with the crushing portions 34 and 36 that are crushed in one direction so that they can be alternately overlapped with each other can be formed.
[0022]
[0023]
[0024]
[0025]
[0026]
[0027]
Moreover, in general, the current sensor is said to be able to increase its output value as the number of turns of the winding increases, and from this, as shown in FIG. 2 or FIG. When the prepared current sensors 31 and 31 are opposed to each other in a positional relationship that is symmetrical with respect to the left and right lines, they are positioned on the left side as shown in FIG. 2 (B) and FIG. 3, for example. As a result of the overlapping of the crushing portion 36 of the current sensor 31 and the crushing portion 34 of the current sensor 31 positioned on the right side, the part where the butt end 35 and the butt end 3 are located is Since the number of turns is twice that of the other parts, the output value can be increased as compared with the other parts.
[0028]
Therefore, for example, measurement may be performed by positioning the conductor to be measured in the clamp sensor located in the vicinity of the butted ends 33 and 35 that are overlapped with a gap as shown in FIG. Since it is possible to effectively suppress the adverse effect on the measurement from the gap such that the measured current value is displayed lower than the true value, there is no need to worry about the position of the conductor to be measured in the clamp sensor. , Can perform the measurement work smoothly. Moreover, the pair of current sensors 31, 31 can share the same shape as shown in FIG. 2 and FIG. 3, so that the product cost can be reduced accordingly.
[0029]
【The invention's effect】
As described above , according to the present invention, it is possible to form a current sensor by providing a crushed portion that is crushed so as to be alternately overlapped at the butt end portion. When closed so as to be symmetrical with respect to the line, the crushing portions overlap each other, and as a result, the output value can be increased at the portion where the butt end portion is located compared to other portions.
[0030]
[0031]
[0032]
[0033]
Therefore, even when the measurement conductor is positioned in the clamp sensor located in the vicinity of the butt end, and the measurement current value is displayed lower than the true value, the measurement is received from the gap. Therefore, the measurement operation can be performed smoothly without worrying about the position of the conductor to be measured in the clamp sensor. Moreover, since the pair of current sensors can share the same shape, the product cost can be reduced accordingly.
[0034]
In addition, when using a hollow tube as a core material, since the characteristic of the Rogowski coil which is one aspect | mode of a coreless coil can be utilized in principle, the measurable range can be ensured in a wide range.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram showing the manufacturing process as (a) to (c) for an example of a current sensor .
[Figure 2] per this onset Ming example, a front view at the time of closing as (b) respectively show plan views of the operating state of the opening and closing as (b).
Figure 3 is a front view showing an operating state of the opening and closing of the onset Ming another example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Current sensors 12 and 13 Butt end part 14 Flexible coil bodies 15 and 16 Large diameter part 17 Core material 18 Hollow tube 18a Base end part 18b Tip part 19 and 20 Thick part 21 Heat contraction tube 22 Winding 31 Current sensor 31a Base end 31b Tip 32 Winding 33, 35 Butt end 34, 36 Crushing part

Claims (2)

The clamp sensor is composed of a left sensor part and a right sensor part that are pivotally supported by the instrument body so as to be openable and closable. Alternatively, in a pair of current sensors in which indirect contact is freely arranged , a winding is provided on the peripheral surface over the entire length of an insulating hollow tube as a core member having a thick portion at the base end portion and the tip end portion. Each of the pair of current sensors formed by forming the butt end portions provided at the base end portion and the tip end portion with the thick portion is formed by a crushing portion that alternately overlaps and abuts when closed. A current sensor structure for a clamp sensor. The current sensor structure for a clamp sensor according to claim 1, wherein the current sensor is a Rogowski coil.

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