JPH0412657Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a through-type current transformer that can also be used as a current transformer with a primary conductor. In the through-type current transformer, the annular core is provided with a rectangular primary conductor through-hole at the center thereof, and the rectangular-shaped primary conductor is provided in the through-hole near the opening edge at each end of the through-hole. The present invention relates to a through-type current transformer characterized in that a plurality of fixing holes for attaching a support member having a support opening for a primary conductor are assembled in opposite directions in different directions.

Current transformers used in switchboards etc. are generally of the type shown in Figure 1 with a primary conductor and the type with a secondary conductor.
It is roughly divided into the through-type type shown in the figure. For the type with a primary conductor, the primary conductor a is embedded integrally.
It connects the conductors in the switchboard to both ends of the primary conductor a, and is mainly used when replacing existing products. The through-type type has a large-diameter through-hole b, and the primary conductor is inserted freely through the through-hole b, so when installing a new current transformer, this form is recommended. use something In other words, users request the above two types of current transformers, and manufacturers currently provide both types, but in terms of manufacturing, two types of molds are required, and inventory management is also difficult. It was time-consuming.

This invention was made in view of the above points, and is intended to provide a through-type current transformer that can also be used as a primary conductor-equipped current transformer.

Examples of this invention will be described in detail below with reference to the drawings, but this invention is not limited to the following examples.

3 and 4 show the overall structure of the feedthrough current transformer 1. FIG. 2 is an annular core around which a secondary coil 3 is wound;
It is embedded in the mold body 4. Mold body 4
Legs 5 for installation are attached to the lower part of the unit.
Reference numerals 6 and 6 designate secondary terminals drawn out from the secondary coil 3 provided protrudingly from the molded body 4.
A through hole 7 for a primary conductor is provided in the horizontal direction at the center of the annular core 2 of the molded body 4, and opening edges 8 at both ends of each through hole 7,
Two sets of fixing holes 9, 9, 9, 9 for attaching four primary conductor support members are provided in two opposing horizontal and vertical directions in the through hole 7 near the hole 8. The fixing hole 9 is actually constituted by a fixing member 9 with a thread cut on the inner surface embedded in the mold body 4, as shown in FIG.

When used as a through-type current transformer, it is used as described above, and in the switchboard, a primary conductor with both ends fixed at appropriate locations in the switchboard is freely located in the through hole 7.

The structure of a current transformer 1' with a primary conductor constructed using the above-mentioned feedthrough current transformer 1 will be described below.

FIG. 6 shows the overall structure of the current transformer 1' with a primary conductor, and the primary conductor 11 made of flat copper shown in FIG. 7 is supported by the disk-shaped primary conductor support members 10, 10 shown in FIG. installed. Support member 10
is a molded product made of insulating material, with a primary conductor 1 in the center.
1 support opening 12, and 1 mounting hole at the top and bottom positions.
3 and 13 are provided. The mounting holes 13, 13 of the support member 10 are aligned with the fixing holes 9, 9 in one direction, and the support member 10 is mounted by tightening the bolts 14, 14. In the embodiment, longitudinal fixing holes 9, 9 are used, so that the support opening 12
is located horizontally, and the support member 10 is also supported in the horizontal direction. Primary conductor 11 and support members 10, 10
is fixed through the support holes 15, 1 of the primary conductors 11, 11.
10, which is inserted and fixed upright in the diameter-reduced state.
The outer surfaces of the support members 10, 10 are pressed and fixed by spring pins 16, 16 shown in the figure. The connection with the conductor in the switchboard is the primary conductor 1.
This is done through the connection holes 17, 17, 17, 17 of 1 and 11. That is, if the conductors in the switchboard are in a horizontal state, the connections are made as described above, but if they are in a vertical state, the supporting members 10, 10 are attached using the horizontal fixing holes 9, 9, and the connections are made in the vertical direction. The primary conductor 11 may also be placed perpendicular to the support opening 12. If the fixing holes are provided in two directions, vertical and horizontal, as described above, they can be used selectively as appropriate, and if they are provided in the diagonal direction, the degree of compatibility will be further increased. In addition, in the above embodiment, the fixing hole is placed in the through hole near the opening edge, which maintains a long creepage distance (distance along the surface of the object) between the grounding leg and the supported primary conductor, and provides insulation. This configuration is designed to improve performance. If the fixing hole is provided at the edge of the opening, the protrusions 4', 4' of the molded body forming the opening of the through hole that should have a long creepage distance as described above.
It is necessary to make it more protruding than that of the above embodiment.

FIG. 9 shows another embodiment of the support member used,
The support openings 12 are provided in three stages and are configured to support three primary conductors (for three-phase and zero-phase).

This idea is structured as above, so
It is a practical current transformer that can be easily used as a through type as before, and also as a type with a primary conductor, and has the great advantage of not requiring two types of molds in terms of manufacturing.

In addition, since the support member of the primary conductor does not protrude from the current transformer body, its shape does not become large, and multiple sets of fixing holes are provided so that the support member can be aligned in the direction of penetration of the primary conductor. , the primary conductor can be supported regardless of the direction in which the current transformer main body is disposed, and the arrangement in a switchboard or the like is facilitated.

[Brief explanation of drawings]

1 and 2 are front views including a cutaway cross section of a conventional general current transformer with a primary conductor and a through-type current transformer, respectively, and FIG. 3 is a front view including a cutaway cross section of an embodiment of this invention. Fig. 4 is a perspective view of the same, Fig. 5 is an enlarged sectional view of the fixing hole, Fig. 6 is a front view including a cutaway cross section showing the state of use as a current transformer with a primary conductor, and Fig. 7
The figure is a plan view of the primary conductor, Figures 8A and B are front and side views of the primary conductor support member, Figure 9 is a front view of another embodiment of the primary conductor support member, and Figure 10 is a perspective view of the spring pin. It is a diagram. 1... Through-type current transformer, 2... Annular core, 3...
Secondary coil, 4... Mold body, 5... Legs for installation, 7... Through hole, 8... Opening edge, 9... Fixing hole, 10... Support member, 12... Support opening.

Claims (1)

[Scope of utility model registration request] A through-type current transformer in which an annular core around which a secondary coil is wound is embedded in a mold body and legs for installation are attached, and a through hole for a rectangular primary conductor is provided at the center of the annular core, A plurality of fixing holes for attaching a support member having a support opening for the rectangular primary conductor are provided in the through-hole near the opening edges at both ends of each of the through-holes, facing each other in different directions. A through-type current transformer.