JPH08273951A - Structure of current detector and method for mounting to electrical wire - Google Patents

Abstract

PURPOSE: To facilitate assembly by eliminating the trouble for fitting an insulation cover to the outer periphery of both split bodies and simplifying structure in a current detector. CONSTITUTION: A first split core 18 is mounted to a first holder 16 with a clamping part 20, at the same time a current sensor 24 is included in the first split core 18, and insulation covering 19 is executed to the outer periphery including the clamping part 20, thus forming a first split body 12. A second split core 29 is mounted to a second holder 27 with a clamping part 31 and an insulation covering 30 is executed to the outer periphery including the clamping part 31, thus forming a second split body 13. While an electric wire 15 is held between the first split body 12 and the second split body 13, the clamping parts 20 and 31 of both holders 16 and 27 are clamped by bolts 36 and 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a current detector that is mounted on an electric line to detect a line current and a method of attaching the electric current detector to an electric wire.

[0002]

2. Description of the Related Art As a conventional current detector of this type,
For example, a structure as shown in JP-A-4-106477 is known. This conventional current detector has a first
It is configured by being divided into a divided body and a second divided body. First
The split body is formed by attaching the first split core to a first holder having a pair of tightening portions, interposing a current sensor in the first split core, and molding an insulating coating on the outer periphery of the current sensor. Has been done. The second split body is formed by attaching the second split core to a second holder having a pair of tightening portions, and molding an insulating coating on the outer circumference of the second split core. Then, with the electric wire being sandwiched between the first divided body and the second divided body, the tightening portions of both holders are tightened with bolts and nuts, and the current detector is mounted on the electric wire. .

Further, in this conventional current detector,
The insulating container is fixed to the first holder of the first divided body. A signal line made of an optical fiber is inserted from the tip end side into the insulating container, and the signal line is joined to the optical fiber at the current sensor side by a laser. Then, the insulating container is filled with an insulating material such as silicone grease,
In this state, the insulating coating is molded on the outer circumference of the insulating container, the first holder, and the first split core.

[0004]

However, in this conventional current detector, the tightening portions on the holders of the two divided bodies are projected on both sides of the insulating coating, and the tightening portions are provided on the outside of the insulating coating by bolts and nuts. It is designed to be tightened by. For this reason, after assembling the two divided bodies in a state of sandwiching the electric wire, it is necessary to mount an insulating cover on the outer circumference of them, which causes a problem that the structure is complicated and the assembling is complicated, and the whole becomes large. there were.

Further, in the conventional current detector, a signal line made of an optical fiber is inserted from the tip end side of the insulation housing cylinder, and the signal line is connected to the current sensor side optical fiber at the base end side of the insulation housing cylinder. Are joined by laser. Therefore, there is a problem that the work of connecting the signal line to the current sensor is troublesome and takes time.

The present invention has been made by paying attention to the problems existing in such conventional techniques. Its main purpose is to assemble both split bodies into the state of holding the electric wire,
(EN) Provided is a structure of a current detector and a method of attaching it to an electric wire, which does not require an insulating cover to be attached to the outer periphery thereof, has a simple structure, can be easily assembled, and can be downsized. Especially.

Another object of the present invention is to provide a current detector capable of easily connecting a signal line to a current sensor in a short time.

[0008]

In order to achieve the above object, in the invention according to claim 1, the first split core is attached to the first holder having the tightening portion, and the outer periphery thereof is insulated. The first divided body formed by coating the first divided body and the second divided core formed by attaching the second divided core to the second holder having the tightening portion, and the insulating coating on the outer periphery of the second divided core and the first divided body. A first split body and a second split body, and a current sensor interposed in the first split core.
In a current detector in which the electric wire is sandwiched between the divided body and the holder, the clamping parts of both holders are tightened by the tightening means so that the electric wire is mounted on the electric wire. It is formed so as to surround the entire outer circumference of the holder and the split core, including the attachment portion.

According to a second aspect of the present invention, in the current detector according to the first aspect, the tightening means is a pair of screws screwed from the tightening portion of one holder to the tightening portion of the other holder. One bolt is provided with a restricting means for restricting a screw revolving rotation more than a predetermined value, and the other bolt is provided with a disengagement preventing means for preventing disengagement when the screw is retracted. is there.

According to a third aspect of the present invention, in the current detector according to the first aspect, the first holder of the first divided body is provided with an insulating housing cylinder that is dividable in the axial direction. The signal line of the optical fiber extending from the current sensor is connected to the signal line of the optical fiber for external extraction via a connector in the insulating container.

In the invention of the method for mounting the current detector on the electric wire according to the fourth aspect, with the first bolt alone being screwed in a predetermined amount, the second divided body is arranged around the first bolt. The electric wire holding portion of the first divided body is opened by rotating relative to the one divided body, and then the electric wire is inserted onto the electric wire holding portion of the first divided body, and further, the first bolt is centered. Then, the second divided body is relatively rotated with respect to the first divided body to close the wire holding portion of the first divided body, and then the first bolt is tightened, and the second bolt is attached to the tightened portions of both divided bodies. Are screwed together to connect the split cores of both split bodies.

[0012]

In the current detector according to the first aspect, the insulating coating of each divided body is formed so as to surround the entire outer periphery of the holder and the divided core including the tightening portion. Therefore, it is not necessary to attach the insulating covers to the outer circumferences of the two holders after assembling them in a state of holding the electric wires to cover the tightening portions and the tightening means of both holders. Therefore, the structure of the current detector can be simplified, the assembling can be easily performed, and the entire size can be reduced.

Further, in the current detector according to claim 2,
The current detector can be attached to the electric wire by rotating the second divided body with respect to the first divided body while opening and closing the bolt. Therefore, the work of attaching the current detector to the electric wire can be performed easily and in a short time.

Further, in the current detector according to the third aspect, when the signal line of the optical fiber is connected, the insulation accommodating cylinder is divided and opened, and extends from the current sensor in the insulation accommodating cylinder. The signal line is connected to the signal line for external extraction by a connector. After that, the insulating container can be closed. Therefore, the signal line made of the optical fiber can be easily connected to the current sensor, and the connection work can be performed easily and in a short time.

According to a fourth aspect of the present invention, there is provided a method of mounting a current detector, wherein the second divided body is firstly arranged around the first bolt.
The current detector can be attached to the electric wire by opening and closing and rotating the divided body. Therefore, the work of attaching the current detector to the electric wire can be performed easily and in a short time.

[0016]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 4, the current detector 11 of this embodiment is divided into a first division body 12 and a second division body 13, and a signal line is connected to the outer end surface of the first division body 12. The portion 14 is provided so as to project. The current detector 11 is mounted on the electric wire 15 with the electric wire 15 sandwiched between the first divided body 12 and the second divided body 13 to detect the line current.

In the first divided body 12, the first divided core 18 is positioned and mounted on the first holder 16 via the first core case 17, and substantially the entire outer circumference thereof is made of an insulating material such as rubber. It is formed by applying the first insulating coating 19 as described above. The first holder 16 is made of synthetic resin, and a pair of bolt insertion cylinders 20 as tightening portions are screwed and fixed to both ends thereof. The bolt insertion cylinders 20 are also embedded in the first insulating coating 19 except for both end surfaces.

The first core case 17 is made of synthetic resin, and is composed of a case body 21, a pair of cylindrical portions 22 projecting from the upper ends of the case body 21, and a holding plate 23. The first split core 18 is composed of a pair of L-shaped cores 18 a and 18 b made of a laminated body of silicon steel plates, and is arranged in a substantially semi-annular shape in the first core case 17 to hold the pressing plate 2.
3 and a plurality of screws 25 are held on the main body case, and both ends thereof are held so as to project from the upper end of the tubular portion 22. The current sensor 24 is arranged between the L-shaped cores 18a and 18b of the first split core 18 and is fixed to the holding plate 23 with an adhesive, and a pair of signal lines 26 made of optical fibers are extended to the outer bottom surface thereof. ing.

In the second split body 13, the second split core 29 is positioned and mounted on the second holder 27 via the second core case 28, and substantially the entire outer circumference thereof is made of an insulating material such as rubber. The second insulating coating 30 is formed. The second holder 27 is made of synthetic resin, and female screw cylinders 31 and 39 as fastening parts are welded and fixed to both ends thereof. One female screw cylinder 31 is used for the second divided body 13
It is formed long so as to project further. The female screw cylinders 31 and 39 are also embedded in the second insulating coating 30 except for the opening edge.

The second core case 28 is made of synthetic resin, and is composed of a case body 32 and a holding plate 33. The second split core 29 is formed of a laminated body of silicon steel plates into a substantially prismatic shape, and is housed and arranged in the second core case 28. Both ends of the split cores 18 and 29 are formed in a comb shape, and the first split body 12 and the second split body 13 surround the electric wire 15 by engaging these comb-shaped end portions with each other. It is assembled and placed in the state.

Each pair of guide protrusions 34 is formed on each tubular portion 22 of the first core case 17 so as to be positioned in front of and behind both ends of the first split core 18. The pair of guide holes 35 are located at the front and rear of both ends of the second split core 29 so that the second core case 28 and the second insulating coating 30 are provided.
It is formed between and. Then, by fitting the guide protrusions 34 into the guide holes 35, the comb-teeth end portions of the split cores 18 and 29 are engaged at predetermined positions.

The first and second tightening bolts 36 and 37 constituting the tightening means are composed of the first divided body 12 and the second divided body 1.
In the state that the electric wire 15 is sandwiched between
Of each of the bolt insertion cylinders 20 and is screwed into each of the female screw cylinders 31 of the second divided body 13. Then, by tightening these tightening bolts 36, 37, both divided bodies 12, 1
3 are connected and fixed to each other, and the current detector 11 is connected to the electric wire 15
Mounted on top.

The pair of step portions 38 are formed by the respective bolt insertion cylinders 2.
The spring washers 39 are formed on the inner circumference of the springs 0 and on their upper surfaces. The restriction ring 40 that constitutes the restriction means is mounted on the first tightening bolt 36, and when the first tightening bolt 36 is screwed back and rotated, the restriction ring 40 comes into contact with the step portion 38, and the first tightening bolt 36 is tightened. Further screwing back rotation of the attached bolt 36 is restricted. The stop ring 41, which constitutes the fall-out preventing means, is attached on the second tightening bolt 37, and when the second tightening bolt 37 is screwed back and rotated, the stop ring 41 comes into contact with the stepped portion 38 to insert the bolt. Cylinder 20
The second tightening bolt 37 is prevented from falling off. In addition,
In this embodiment, C rings are used as the restriction ring 40 and the stop ring 41.

As shown in FIGS. 1, 5 and 6, the insulating housing tube 42 in the signal line connecting portion 14 is the first holder 1
It is screwed in the center of 6 and is fixed by a nut 43 to prevent rotation. The insulating container 42 is formed of a synthetic resin into a cylindrical shape, and a lower half of the insulating container 42 is divided into a main body portion 42a and a lid portion 42b along the axial direction into a plurality of screws 4.
It is assembled and fixed by 4.

A cable 45 for external extraction is inserted from the lower end into the insulating housing 42, and a signal line 46 composed of a pair of optical fibers and a tension member 47 for applying a tension to the cable 45 are provided in a protective tube 48. It is configured by aligning with. A pair of connection terminals 49 are provided for each signal line 4
It is attached to the tip of 6, and the signal line 46 can be connected to a measuring device not shown by this connecting terminal 49.

The pair of ferrule-type connectors 50 are arranged between the signal line 26 extending from the current sensor 24 and the signal line 46 for external drawing. Each connector 50
Is composed of a main body 51 fixed to the end of the signal line 26, a sleeve 52 having a vertical split groove fitted in the main body 51, and a connecting portion 53 fixed to the signal line 46. The signal line 26 and 46 can be connected by fitting the connecting portion 53 into the sleeve 52 and joining the signal lines 26 and 46 coaxially.

A high-viscosity insulator 54 made of silicone grease or the like is filled in the insulating container 42, and the insulator 53 holds the signal lines 26 and 46 and the connector 50 in a sealed state in the insulating container 42. To be done. Then, the first insulating coating 19 of the first divided body 12 is formed to extend to the outer circumference of the end of the cable 45 through the outer circumference of the insulating housing tube 42, and the insulating folds 55 are formed at the portions corresponding to the insulating housing tube 42.
Are integrally formed.

Next, a method of mounting the current detector constructed as described above will be described. When the current detector 11 is attached to the electric wire 15, the first tightening bolt 3 in the connected state of the two divided bodies 12 and 13 shown in FIG.
When 6 is screwed back and rotated, the restriction ring 40 abuts and engages with the step portion 38, and further screwed back rotation of the first tightening bolt 36 is restricted. Further, when the second tightening bolt 37 is screwed back and rotated, the stop ring 41 abuts on the step portion 38, and the second tightening bolt 37 is prevented from coming off from the bolt insertion tube 20. Then, as the two bolts 36, 37 are screwed back and rotated, as shown by the solid line in FIG.
Can be separated from the first divided body 12.

In this way, with the first tightening bolt 36 still screwed into the female screw cylinder 31 by a predetermined amount, as shown by the chain line in FIG. When the two-divided body 13 is relatively rotated with respect to the first divided body 12 by about 90 degrees, the wire holding portion on the upper surface of the first divided body 12 is opened. In this case, the first tightening bolt 36 is the second tightening bolt 3
7 is screwed to the female screw cylinder 31 longer than the female screw cylinder 39, the two divided bodies 12 and 13 are connected to each other via the first tightening bolt 36 even if the second tightening bolt 37 is removed. There is.
Therefore, in this state, on the wire holding portion of the first divided body 12,
The electric wire 15 can be inserted.

Thereafter, when the second divided body 13 is returned and rotated about 90 degrees with respect to the first divided body 12 about the first tightening bolt 36, the first divided body 13 is divided into the first divided body as shown by the solid line in FIG. The wire holding part of the body 12 is closed. In this state, while tightening the first tightening bolt 36, the second tightening bolt 37
1 is screwed into the female screw cylinder 31 and tightened, the split cores 18 and 29 of the split bodies 12 and 13 are engaged with each other at both ends of the comb-tooth shape as shown in FIG. , 1
3 is assembled and fixed in a coupled state. Thereby, the entire current detector 11 can be mounted on the electric wire 15.

As described above, in the current detector of this embodiment, the first insulating coating 19 of the first divided body 12 including the bolt insertion tube 20 as the tightening portion includes the first holder 16.
Also, it is formed so as to surround the entire outer periphery of the first split core 18. In addition, the second insulating coating 30 of the second divided body 13
Is also formed so as to surround the entire outer peripheries of the second holder 27 and the second split core 29, including the female screw cylinder 31 as the tightening portion.

Therefore, as in the conventional structure in which the tightening portions of each divided body are projected on both sides of the insulating coating, both divided bodies are assembled in a state in which the electric wires are clamped, and then an insulating cover is attached to the outer periphery thereof. Therefore, it is not necessary to cover the tightening portion and the tightening bolt. Therefore, the structure of the current detector 11 can be simplified, the assembling can be easily performed, and the entire current detector 11 can be downsized.

Further, in the current detector 11 of this embodiment, the regulation ring 40 as the regulation means is mounted on the first fastening bolt 36, and the second fastening bolt 3 is also provided.
A stop ring 41 as a fall-off preventing means is attached to the top of the stopper 7. Therefore, the current detection is performed by rotating the second divided body 13 with respect to the first divided body 12 with respect to the first divided body 12 with the first fastening bolt 36 as a center with the both fastening bolts 36 and 37 still attached. The device 11 can be attached to the electric wire 15. Therefore, the work of attaching the current detector 11 to the electric wire 15 can be performed easily and in a short time.

Further, in the current detector of this embodiment, the insulation housing tube 42 of the signal line connecting portion 14 is divided into a main body portion 42a and a lid portion 42b along the axial direction in a substantially lower half portion. There is. In addition, in the insulating container 42,
The optical fiber signal line 26 extending from the current sensor 24 is
Optical fiber signal line 4 in the cable 45 for external extraction
6 is connected via the connector 50.

Therefore, the lid portion 42b of the insulation containing cylinder 42
With the main body 42a opened by removing the signal line 26 by the connector 50 in the main body 42a.
After connecting 46, the lid 42b may be attached to the main body 42a. Therefore, the signal line made of an optical fiber can be easily connected to the current sensor 24, and the connection work can be performed easily and in a short time.

The present invention can be modified and embodied as follows. (A) As the restriction ring 40 or the stop ring 41, a protrusion is provided at a predetermined position of the bolts 36, 37 instead of the C ring. (B) Use the tightening bolts 36 and 37 that have the same diameter. (C) The restricting means provided on one of the bolts 36 should be omitted, and the same structure as the fall prevention means provided on the bolt 37 should be adopted.

Further, the technical idea understood from the above embodiment will be described below. (1) Before and after both ends of the first split core, a pair of guide projecting pieces are formed to project on a case that houses the first split core, and a pair of guide holes are provided at both ends of the second split core. The current detector according to claim 1, wherein the current detector is formed between the case that houses the second split core and the second insulating coating so as to be positioned in front of and behind the portion. With this configuration, the split cores can be engaged at the predetermined positions by fitting the guide protrusions into the guide holes. (2) The restricting means for restricting the screw backward rotation is
The current detector according to claim 2, comprising a C ring provided on the bolt, and an engaging member provided on the stepped portion of the bolt insertion tube and engaged with the C ring. With this configuration, the two divided bodies can be integrally held, and the work of attaching the current detector to the electric wire can be performed easily and in a short time. (3) The current detection according to claim 2, wherein the fall-out preventing means for preventing the bolt from falling off when it is screwed back is composed of a C ring and a stepped portion of the bolt insertion tube with which the C ring engages. vessel. With this configuration, it is possible to easily and surely prevent the bolt from falling off when the screw is retreated. (4) The connector includes a body portion fixed to one end of one signal line, a sleeve having a split groove fitted in the body portion, and a connection portion fixed to the other signal line. The current detector according to claim 3, which is provided. According to this structure, the work of connecting both signal lines can be performed easily and in a short time.

[0038]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it has the following effects. According to the invention of claim 1, after assembling the two divided bodies in a state of sandwiching the electric wire,
Since it is not necessary to attach an insulating cover to the outer periphery of them, the structure is simple and the assembling can be easily performed, and the entire size can be reduced.

According to the second aspect of the invention, the current detector can be attached to the electric wire by rotating the second divided body with respect to the first divided body while opening and closing the bolt while the bolt is still attached. The mounting work can be performed easily and in a short time.

According to the third aspect of the invention, the signal line made of the optical fiber can be easily connected to the current sensor, and the connecting work can be performed easily and in a short time.

According to the invention described in claim 4, the current detector can be attached to the electric wire by rotating the second divided body with respect to the first divided body about the first bolt. The mounting work can be performed easily and in a short time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a current detector of the present invention.

FIG. 2 is a plan view of a first division body in the current detector.

FIG. 3 is a bottom view of the second divided body.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is an enlarged cross-sectional view taken along line 5-5 of FIG.

FIG. 6 is an exploded cross-sectional view of an essential part showing a connector portion of a signal line in an enlarged manner.

FIG. 7 is a fragmentary front view showing the process of attaching the current detector to the electric wire.

[Explanation of Codes] 11 ... Current detector, 12 ... First split body, 13 ... Second split body, 15 ... Electric wire, 16 ... First holder, 18 ... First split core, 19 ... First insulating coating, 20 ... Bolt insertion cylinder as a tightening portion, 24 ... Current sensor, 26 ... Signal line, 27 ... Second
Holder, 29 ... Second split core, 30 ... Second insulating coating, 3
DESCRIPTION OF SYMBOLS 1 ... Female screw cylinder as a fastening part, 36 ... 1st fastening bolt which comprises a fastening means, 37 ... 2nd fastening bolt which comprises a fastening means, 38 ... Step part, 39 ... Spring washer, 40 ... a restricting ring that constitutes the restricting means, 41 ... a stop ring that constitutes the falling-off preventing means, 42 ... an insulating housing cylinder, 42a ... a main body part, 42b ... a lid part, 45 ... a cable for external drawing, 46 ... a signal line, 50 ... Connector.

Claims (4)

[Claims] 1. A first holder comprising a first holder having a tightening portion, a first split core attached to the first holder, and an insulating coating applied to the outer periphery of the first split core.
The second divided core is attached to the divided body and the second holder having the tightening portion, and the outer periphery of the second divided body is insulated, and the first divided core of the first divided body is interposed. A current sensor mounted on the electric wire, and the electric wire is sandwiched between the first divided body and the second divided body, so that the fastening portions of both holders are fastened by the fastening means and mounted on the electric wire. In the above current detector, the insulating coating of each of the divided bodies is formed so as to surround the entire outer circumference of the holder and the divided core including the tightening portion. 2. The tightening means comprises a pair of bolts screwed from a tightening portion of one holder to a tightening portion of the other holder, and the one bolt restricts a screw retracting rotation more than a predetermined value. 2. The current detector according to claim 1, wherein the bolt detector is provided with a restricting means for preventing the other bolt from being removed when the screw is retracted. 3. A first holder of the first split body is provided with an insulating housing tube that can be split along the axial direction, and in the insulating housing tube, a signal line of an optical fiber extending from a current sensor is externally drawn out. The current detector according to claim 1, which is connected to a signal line of an optical fiber for use via a connector. 4. An electric wire is sandwiched between a first split body containing a first split core and a current sensor and a second split body containing a second split core, and a pair of tightening portions of both split bodies are provided. In the method of mounting the current detector on the electric wire by tightening the bolt, the current detector is attached to the electric wire. In the state in which only the first bolt is screwed in a predetermined amount, The two-divided body is rotated relative to the first divided body to open the electric wire holding portion of the first divided body, and then the electric wire is inserted onto the electric wire holding portion of the first divided body. The second split body is rotated relative to the first split body about the first bolt to close the wire holding portion of the first split body, and then the first bolt is tightened and both split bodies are tightened. The second bolt is screwed to the part to connect the split cores of both split bodies to the electric wire of the current detector. Method.