JP2012212837A - Split-type current transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split-type current transformer in which a lock part can be unlocked easily without injuring the nail of a finger or destroying the lock part in the unlock operation of the lock part when the split-type current transformer is split.SOLUTION: The lock part of a split-type current transformer can be unlocked safely and easily by a structure capable of unlocking the lock part by applying a pressing force.

Description

  This invention accommodates the first iron core and the second iron coil wound with the secondary coil in cases made of an insulating material, and joins the end faces of each iron core to form a closed magnetic circuit. Related to the structure of the vessel

  As a conventional split-type current transformer, a first iron core housed in a first case located on the upper side and a second iron core wound with a secondary coil housed in a second case located on the lower side In order to form a closed magnetic circuit by joining, a thin-walled connecting portion for connecting the first case and the second case to one end of the core core is connected to the first case and the second case for the other end of the core core. A split type having a structure in which a detection current line insertion window portion is formed by bending the connecting portion and engaging the lock portion with the lock portion engagement portion. There is a current transformer. (For example, see Patent Document 1)

JP 2001-307934 A

In the split-type current transformer shown in FIG. 5 disclosed in Patent Document 1, the lock portion is released and the window portion is released in order to be inserted and attached to the detected current line. As a result, a pressing force is generated on each iron core joint surface, and a force that bites into the lock portion is applied to the lock portion engaging portion.
The lock part is released by engaging the fingernail tip between the case and the lock part and pulling it off. There was a problem that the part was damaged.

  In addition, when removing a split-type current transformer that is inserted and attached to the current line to be detected, the work is often performed in a narrow space, so only one hand may be inserted, and it is difficult to release the engagement. was there.

  The present invention has been made to solve the above-mentioned problems, and provides a split-type current transformer that does not perform the engagement release method with a fingernail or the like and that can be easily released with one hand. It is an object.

  In order to solve the above problems, the split type current transformer of the present invention has a structure in which the engagement can be released by pressing the engagement release knob, and further, the thin case that connects the first case and the second case when the engagement is released. A structure in which an arm formed by housing the first iron core is opened in the first case located on the upper side by the elastic force of the connecting portion having a shape.

  By adopting a structure in which the engagement release knob can be released by pressing the engagement release knob, it can be easily released, and a split-type current transformer that does not cause claw injury or damage to the lock portion can be obtained.

  In addition, by adopting a structure in which the engagement can be released by pressing the engagement release knob, a divided current transformer can be obtained that can be easily detached from the detected current line in a narrow place with one hand. be able to.

It is a plane sectional view showing a division type current transformer in an embodiment of the present invention. It is a right view which shows the split type current transformer of this invention. It is a top view which shows engagement cancellation | release of the division | segmentation type current transformer lock | rock part of this invention. It is a top view which shows the state which canceled the engagement of the division | segmentation type current transformer lock | rock part of this invention, and the arm opened. The external shape of the split-type current transformer shown by patent document 1 as a prior art is shown, (a) is a top view, (c) is a front view, (d) is a right view.

  Hereinafter, embodiments of the divided current transformer according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part which is the same in each figure, and the description is abbreviate | omitted.

The split type current transformer in the structure of the present invention will be described with reference to FIGS.
1 and 2, the first iron core 3 is formed of an insulating material and is housed in the first case 1 located on the upper side, and the second case 2 is located on the lower side, and the secondary coil 4 is wound. In order to join the second iron cores 5 to each other to form a closed magnetic circuit, a thin-walled connecting portion 13 that connects the first case 1 and the second case 2 is provided at the end of one iron core joining surface 10a. It is.
Further, at the end of the other iron core joint surface 10b, a lock portion engaging portion 11 is provided in the first case 1, and a hook 15 comprising a lock portion 8 and an engagement release knob 12 is provided in the second case 2. The first case 1 and the second case 2 are integrated by bending the connecting portion 13 so that the iron core joining surfaces 10a and 10b are joined, and the lock portion 8 of the hook 15 is engaged with the lock portion engaging portion 11. The detected current line insertion window 7 is formed along with the formation of the closed magnetic circuit.
In the current detection, the detected current line 6 is inserted to integrate the first case 1 and the second case 2, and the detected current line insertion window 7 is formed to detect the current.

FIG. 3 and FIG. 4 show the disengagement of the split-type current transformer and the arm 14 opened in the embodiment of the present invention.
By pressing the engagement release knob 12 of the hook 15 with a finger, the lock portion 8 engaged with the lock portion engagement portion 11 is released, and the arm is moved by the elastic force of the connecting portion 13 provided at the end of the iron core joint surface 10a. 14 opens and can be removed from the detected current line 6.

  In addition, there are provided misoperation prevention convex portions 16 on both sides so as to sandwich the engagement release knob 12 of the hook 15 so that the engagement release knob 12 is not accidentally released due to something hitting the engagement release knob 12. Prevention is intended.

  As described above, according to the split type current transformer in the embodiment of the present invention, since the engagement release knob that can release the engagement between the lock portion and the lock portion engagement portion by pressing operation is provided, In addition, it is possible to provide a split type current transformer that can safely disengage and release the arm.

DESCRIPTION OF SYMBOLS 1 1st case, 2 2nd case, 3 1st iron core, 4 Secondary coil, 5 2nd iron core, 6 Detected current wire, 7 Detected current wire insertion window part, 8 Lock part, 9 Spring part, 10a , 10b Iron core joint surface, 11 Locking portion engaging portion, 12 Locking release knob, 13 Connecting portion, 14 Arm, 15 Hook, 16 Protruding portion for preventing erroneous operation

Claims (2)

  The first core of the split magnetic core and the second core wound with the secondary coil are accommodated in the first case and the second case formed of insulating resin, and the end faces of the cores are joined together. In a split-type current transformer configured to form a closed magnetic circuit, a thin-walled connecting portion for connecting the first case and the second case is provided at the end of one iron core joining surface, and the other iron core joining is provided. In order to engage the first case and the second case with each other at the end of the surface, the first case and the second case are provided with engaging means for engaging with each other in the form of a convex portion or a concave portion, respectively. A split-type current transformer characterized in that the engagement between the first case and the second case can be released by applying a pressing force to the attaching means.   A misoperation preventing convex portion is provided around the engaging means so that an unintentional erroneous pressing force is not applied to the engaging means for engaging the first case with the second case. Item 1. The divided current transformer according to Item 1.

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