JPH0328498Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a current transformer having a primary conductor in which a ring part conductor wound in a coil is joined to a coaxial part consisting of an inner conductor and an outer conductor arranged coaxially.

An example of this type of current transformer is shown in FIG. In the figure, a primary conductor consisting of a coaxial part 1 and a ring part 2 is
It is housed in a sealed container consisting of an upper container 3, an insulator tube 4, and a lower container 5 that are airtightly connected to each other.

In this case, the primary conductor, except for the upper end of the coaxial section 1,
The coaxial portion 1 and the ring portion 2 are integrally covered with a main insulation 6.

Note that 7 is an iron core and a secondary winding provided to cross the ring portion 2.

Here, as shown in FIG. 2, the coaxial portion 1 of the primary conductor is a tubular inner conductor 1a coaxially arranged with each other.
and an outer conductor 1b, each of the inner conductor 1a and the outer conductor 1b is connected at its upper end to a primary terminal 9 provided on the side wall of the upper container 3 via a connecting conductor 8. Further, the ring portion 2 is made of a conductor formed in a coil shape with at least one turn, and both ends thereof are connected to the lower end side surfaces of the inner and outer conductors 1a and 1b of the coaxial portion 1.

In addition, in FIG. 2 and FIGS. 3 and 4, which will be described later, for convenience of explanation, both the coaxial portion 1 and the ring portion 2 are shown with the main insulator 6 of FIG. 1 omitted.

In order to connect the outer conductors 1a, 1b of the coaxial part 1 and the ends of the ring part 2 with low electrical resistance and mechanically firmly, conventionally both ends of the ring part 2 were connected as shown in FIG. 3a. 2a and 2b are each formed into a conical shape, and are arranged at the joint part 10 on the lower end side surface of the inner and outer conductors 1a and 1b of the coaxial part 1, and as shown in FIG. The conical end portion 2 of the ring portion 2 is gradually built up by welding.
A and 2b were wrapped, and the coaxial part 1 and ring part 2 were joined to obtain a primary conductor.

However, in the above configuration, both ends of the ring part are formed in a conical shape, so when welding the joint part, the welding operator must rotate the coaxial part and the ring part while they are in contact with each other, or the welding operator must do it himself. It was necessary for the welding to move in a spiral manner around the ring, making this welding work extremely difficult, labor-intensive, and time-consuming.

Furthermore, the shape of the primary conductor of this type of current transformer becomes larger as the rated voltage and current increase, so the above-mentioned disadvantages become more pronounced.

In view of the above-mentioned points, the present invention has been developed to facilitate the above-mentioned welding operation and to obtain sufficient mechanical strength of the part.Examples will be described below.

In FIG. 4a, instead of forming both ends of the ring part 2 into a conical shape, they are formed into straight axe-like ends 2c and 2d having dimensions larger than the conductor diameter of the ring part 2 as shown in the figure, When welding the ring part 2 and the coaxial part 1, the axe-shaped end part 2c,
The linear cutting edge of 2d is connected to the inner and outer conductors 1a and 1b.
The inner and outer conductors 1a, 1b and the axe-shaped ends 2c, 2d are brought into contact with each other along the axial direction, and as shown in FIG. The joint portion 10 of the two was fixed by welding.

According to this configuration, as shown in FIG. 3C, it is possible to separately weld the A side and B side of the axe-shaped ends 2c and 2d to the inner and outer conductors 1a and 1b of the coaxial portion. Therefore, there is no need for the coaxial part 1 and the ring part 2 to be rotated while in contact with each other, or for the operator to move and weld in a spiral as in the past, making welding work extremely easy and improving work efficiency. .

Furthermore, since both ends of the ring part 2 are formed into linear axe-like ends 2c and 2d having dimensions larger than the conductor diameter of the ring part 2, the welding area can be widened when welding with the coaxial part 1. It is possible to obtain sufficient mechanical strength.

In this way, the present invention forms both ends of the ring part into straight axe-like ends having a dimension larger than the conductor diameter of the ring part, and the double ax-like ends are formed inside the axe-like end.
Joined in a straight line along the axial direction of the outer conductor,
This allows welding to one side of the ax blade-like end at a time and expands the welding area.

By doing this, the complicated work of frequently rotating the coaxial part and ring part during welding is eliminated, the labor and time required for this rotating work can be greatly reduced, and the welding itself is also spiral-shaped. Since it is simply a round trip from the beginning, it is extremely easy, and the effect is significant as the primary conductor becomes larger.

Furthermore, the end of the ring part can be machined into an ax blade shape by press working, etc., which is extremely easy to process, and the welding area is expanded and both sides are welded to the inner and outer conductors of the coaxial part, respectively. The ring part and the coaxial part can be completely fixed, and the current carrying capacity necessary for a current transformer and the mechanical strength against electromagnetic force can be sufficiently ensured.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the configuration of a current transformer to which the present invention is applied, Fig. 2 is a front view showing the state in which the primary conductor is configured, Fig. 3 a is a front view showing a conventional example, and Fig. 3 b
4A is an explanatory diagram showing the welded state of the joint, FIG. 4A is a front view showing an embodiment of the present invention, FIG. It is a diagram. 1: coaxial part, 1a: inner conductor, 1b: outer conductor, 2: ring part, 2c, 2d: ax blade-shaped end, 1
0: Joint.

Claims (1)

[Scope of utility model registration request] A primary conductor is comprised of a coaxial part made up of an inner conductor and an outer conductor arranged coaxially with each other, and a ring part made of a conductor wound into a coil shape and whose ends are joined to the inner conductor and outer conductor by welding, respectively. In the current transformer, both ends of the ring portion are formed into linear axe-like ends having dimensions larger than the conductor diameter of the ring portion, and the double axe-like ends are connected to the inner and outer conductors. Both side surfaces of the ax blade-like end and the inner part are brought into contact along the axial direction of the
A current transformer characterized in that an outer conductor is fixed to the outer conductor by welding.