JPH02180010A - Current transformer - Google Patents

Abstract

PURPOSE:To simply and inexpensively connect a press fitment in surface contact with the side of a body to a clamping fitment for bringing the inner surface of a through-hole into surface contact with a conductor without processing an insertion hole formed in a clamping bolt and irrespective of the presence of insulation for the conductor to be fixed by providing the clamp fitment and said fixed fitment and clamping both fitments by the clamping bolt with said conductor put between both fitments. CONSTITUTION:A title current transformer includes a current transformer body 1 with a through-hole 1a therethrough, a pair of clamping fitments 11 whose intermediate portions make surface contact with the inner surface of the through-hole 1a when they are mounted with a conductor put therebetween, and a pair (constructed with four members) of press fitments 12 whose one sides make surface contact with the side of the current transformer body 1 when they are mounted with said clamping fitments 11 and said conductor 2 and the clamping fitments 11 are held between the other sides 12b of the press fitments 12, and a clamping bolt 13 is inserted into an insertion hole and clamped through a spring washer 14, a flat washer 15, and a nut 16. Hereby, the current transformer body 1 is fixed to the conducted 2. Thus, the current transformer body can be fixed without processing the conductor 2 and without being limited by the position of the conductor 2.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a current transformer in which a conductor is inserted through a through hole in a current transformer main body, and particularly relates to a current transformer in which a conductor is inserted into a through hole in a current transformer main body. This invention relates to improvements in the coupling structure with conductors.

(Prior Art) Conventionally, in a current transformer (through-type current transformer) in which a conductor is inserted through a through hole in a current transformer body, the coupling means for fixing the current transformer body to the conductor is shown in FIG. The structure shown in Figure 7 was adopted.

That is, as shown in FIGS. 6 and 7, the coupling structure between the current transformer main body 1 and the conductor 2 includes fixing ears 1b having screw holes provided at both ends of the through hole 1a of the current transformer main body 1, In addition, the conductor 2 that is inserted into the through hole 1a of the current transformer body 1 is provided with a tightening bolt insertion hole 2a at a position corresponding to the screw hole 1c of the fixed ear 1b, and the conductor 2 is tightened from the conductor 2 side. bolt 3,
The current transformer body 1 is coupled to the conductor 2 by inserting a spring washer 4 and a flat washer 5 through the insertion hole 2a of the conductor 2, and screwing it into the screw hole 1c of the fixed lug 1b.

(Problem to be Solved by the Invention) However, in the above-mentioned coupling structure, the insertion hole 2a for the tightening bolt must be made in the conductor 2, which requires processing, and the current transformer main body 1 Since the fixing position of the current transformer body 1 is restricted by the position of the insertion hole 2a of the tightening bolt of the conductor 2, it becomes difficult to change the fixing position of the current transformer main body 1. Furthermore, if the conductor 2 is to be insulated, the hole through which the tightening bolt is inserted must be machined, resulting in an expensive construction.

The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to fix the current transformer main body without drilling holes for the tightening bolts in the conductor. To provide a current transformer which can be simply and inexpensively connected regardless of whether conductors are insulated or not.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a current transformer main body having a through hole for a conductor, a presser metal fitting that makes surface contact with the side surface of the current transformer main body, and an inner surface of the through hole directly or with another member. It consists of a fixing fitting that is brought into surface contact with the conductor through the conductor, and the fixing fitting and the holding fitting are fixed with a tightening bolt with the conductor in between.

(Function) The current transformer main body is restrained from moving in this direction by the surface contact of the presser fitting on the side surface, and by the surface contact of the inner surface of the through hole with the conductor, either directly or through another member.
Movement in this direction is restricted. Further, the presser metal fitting and the fixing metal fitting are fixed with a tightening bolt with the conductor in between. Therefore, the fixing position of the current transformer body can be freely selected, the conductor does not require any processing, and manufacturing and assembly are facilitated.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 shows a plan view of an embodiment of the present invention, and FIG.
FIG. 2 is a view taken along the line A-A in FIG. 1;

1 and 2, the current transformer 10 has a through hole 1a
A pair of fixing fittings 11 whose intermediate portions are in surface contact with the inner surface of the through hole 1a when the current transformer main body 1 having a conductor 2 and the conductor 2 are sandwiched between the fixing fittings 11 and the conductor 2. It is comprised of a pair (consisting of four pieces) of presser metal fittings 12 whose negative side comes into surface contact with the side surface of the current transformer main body 1 when installed. Here, the fixing fitting 11 has a width dimension of the through hole 1a.
The current transformer main body 1 has a length that is slightly smaller than the thickness of the current transformer main body 1. Also,
The holding fitting 12 has a width larger than that of the fixing fitting 11 and is formed in an L shape, and the − side 12a is in surface contact with the side surface of the current transformer main body 1, while the other side 12b is for insertion of a tightening bolt. hole(
(not shown). The conductor 2 and the fixing metal fitting 11 are sandwiched between the other side 12b of the presser foot 12 formed in this way, the tightening bolt 13 is inserted into the insertion hole, and the spring washer 14 is inserted.
, the current transformer main body 1 is fixed to the conductor 2 by tightening the flat washer 15 and the nut 16. therefore,
The current transformer main body can be fixed without processing the conductor 2 or being restricted by the position of the conductor 2.

Note that the present invention is not limited to the above-described embodiments, and can be implemented in various modifications. FIG. 3 shows a plan view of another embodiment, and FIG. 4 shows a view taken along the line A-A in FIG.
FIG. 5 is an explanatory diagram showing the assembly procedure.

3 and 4, the current transformer 20 has a through hole 1a
When the current transformer main body 1 having a conductor 2 is mounted between the current transformer main body 1 and the conductor 2, a pair of presser fittings 21 which are in surface contact with the upper side of the current transformer main body 1 and a pressing force are applied to the leaf spring 22 to press the intermediate portion thereof. and a pair of fixtures 23 that bring the conductor 2 into surface contact with the conductor 2. Here, the holding fitting 21 is formed in the shape of a square, the upper side 21a and the vertical side 21b are in surface contact with the side surface and the upper surface of the current transformer main body 1, respectively, and the lower side 21c is in surface contact with the conductor 2 and a tightening bolt. It is provided with an insertion hole (not shown). Further, the fixing metal fitting 23 is formed in an L shape, and has -side 2.
3a is in surface contact with the conductor 2 and has a tightening bolt insertion hole (
(not shown), and the other side 23b has a bent part 23c that locks the end of the leaf spring 22, and this bent part 2
3c, another tightening bolt 24 as shown in FIG.
An insertion hole 23d is provided. Furthermore, leaf spring 2
2 has a width dimension that allows it to be inserted into the through hole 1a, is formed into a substantially U-shape such that the side that is open to the bottom is wider, and has an insertion hole 22 at the end that corresponds to the insertion hole 23d of the presser metal fitting 23.
A is provided.

As shown in FIG.
, semi-tighten with the spring washer 14, flat washer 15 and nut 16, insert the leaf spring 22 into the through hole 1a, lock both ends with the bent part 23c of the fixing fitting 23, and then tighten the leaf spring 22.
2 and the opposing insertion hole 22a of the fixture 23.

Attach the tightening bolt 24 to 23d so as to sandwich the current transformer main body 1.
is inserted and tightened via the spring washer 25, flat washer 26, and nut 27. By this tightening, the mounting fittings 21 approach the current transformer main body 1, the leaf spring 22 is inserted into the fixing fitting 23, and the intermediate part comes into surface contact with the conductor 2, and the current transformer main body 1 is moved closer to the current transformer main body 1. and is fixed to the conductor 2 by a leaf spring 22. Therefore, the current transformer main body 1 can be fixed without providing a hole for a tightening bolt in the conductor 2, and the fixing position can be easily changed.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

■ The main body of the current transformer can be fixed without requiring the processing of through holes or screw holes in the conductor, making manufacturing easier.

■ The fixing position of the current transformer body becomes free.

■ Since the metal fittings that are tightened against the conductor are only in surface contact, there is no possibility of damaging the insulation on the surface of the conductor, even if it is an insulated conductor.

(a) There is no need to provide fixed ears and screw holes on the current transformer body, simplifying the shape of the mold.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. 3 is a plan view showing another embodiment of the present invention, FIG. 4 is a view taken along A-A in FIG. 3, and FIG. 5 is a plan view showing another embodiment of the present invention. An explanatory diagram showing an example assembly procedure, Fig. 6 is a plan view showing the configuration of a conventional current transformer, and Fig. 7 is an A-A in Fig. 6.
It is an arrow view. 1...Current transformer body 1a...Through hole 2...
Conductor 11... Fixing fitting 12... Holding fitting 13... Tightening bolt agent Patent attorney
Nori Chika Ken Yudo Daishimaru Ken Diagram Diagram

Claims (1)

[Claims] A current transformer main body having a through hole for a conductor, a holding metal fitting that makes surface contact with the side surface of the current transformer main body, and a fixing metal fitting that makes surface contact of the inner surface of the through hole with the conductor directly or through another member. A current transformer comprising: the fixing metal fitting and the holding metal fitting, which are fixed with a tightening bolt with the conductor sandwiched therebetween.