JPH10208962A - Gas insulated current transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the connection structure between a coaxial going/return conductor connected to a prim. coil of a current transformer and coaxial terminal conductor attached to an insulation spacer. SOLUTION: An insulation spacer 2 has an outer and inner terminal conductors 301, 302. A current transformer has a prim. coil connected to an outer and inner connection conductors 501, 502 which are mutually fitted through insulation members 10 and coaxially positioned. A male contact 502a at the top end of the inner conductor 502 is contacted to a female contact 302a at the top end of the inner conductor through a louver contact 11. The outer terminal conductor 301 is connected to the outer connection conductor 501, by an adapter conductor 12 surrounding the female contact 302a. An insulation member 15 is inserted between the adapter conductor 12 and female contact 301a to position the conductor 12 and female contact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated current transformer used for monitoring a current in a power system.

[0002]

2. Description of the Related Art A gas-insulated current transformer comprises a metal container in which an opening is hermetically closed by a cone-shaped insulating spacer and an insulating gas is sealed therein, and a current transformer accommodated in the container. And a main body. An annular outer terminal conductor is provided in a state penetrating the insulating spacer, and an inner terminal conductor is provided coaxially (with a central axis shared) inside the outer terminal conductor, and the outer terminal conductor and the inner terminal are provided. The conductor forms a coaxial terminal conductor. In the container, a hollow tubular outer connection conductor having one end connected to one end of the primary coil of the current transformer main body, and one end disposed inside the outer connection conductor and having one end connected to the other end of the primary coil of the current transformer main body The current transformer main body is provided with a coaxial reciprocating conductor comprising an inner connecting conductor connected to the outer connecting conductor and an inner connecting conductor forming the coaxial reciprocating conductor. Connected to one end and the other end of the primary coil.

In a conventional gas insulated current transformer, an inner terminal conductor of a coaxial terminal conductor provided on an insulating spacer and an inner connecting conductor of a coaxial reciprocating conductor provided in a container are connected via a tulip contact. Was.

[0004]

In the conventional gas insulated current transformer, a tulip having a complicated structure is used as means for connecting the inner terminal conductor of the coaxial terminal conductor provided on the insulating spacer to the inner connecting conductor of the coaxial reciprocating conductor. Since the contact was used, the cost was unavoidable.

When the current carrying capacity is large, the size of the tulip contact becomes large, so that there is a problem that the connection between the coaxial terminal conductor and the coaxial reciprocating conductor becomes large and the current transformer becomes large.

Therefore, a tubular portion is formed at the end of the inner terminal conductor on the side of the coaxial reciprocating conductor, the tubular portion is used as a female contact portion, and the end of the inner connection conductor on the coaxial terminal conductor side is formed in a rod shape. And the rod-shaped end portion is used as a male contact portion,
There has been proposed a gas-insulated current transformer in which the male contact portion is connected to the female contact portion via a louver contact by a fitting structure.

A louver contact is formed by forming a large number of slits in a plate made of a good conductor metal such as copper and deforming an edge portion of each slit so as to protrude from the plate surface, thereby forming a large number of louver-shaped contact portions. The edge portion protruding from the plate surface comes into contact with the counterpart contact portion so as to bite. The louver contact is formed so as to form an entire ring, and is fitted in a groove provided on the outer periphery of the male contact portion.

As described above, a tubular female contact portion and a rod-shaped male contact portion are provided on the inner terminal conductor and the inner connection conductor, respectively, and the two contact portions are fitted to each other to form a tulip contact. Since the number of components can be reduced and the structure can be simplified as compared with the case of using, the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor can be made small.

Further, with the above configuration, it is possible to increase the capacity of a current that can flow between the female and male contacts by merely increasing the number of louver contacts interposed between the female and male contacts. Because you can
It is possible to cope with an increase in current capacity without increasing the size of the connection between the coaxial terminal conductor and the coaxial reciprocating conductor.

However, when the louver contacts are used as described above, the dimensional accuracy of the gap between the female contact portion provided on the inner terminal conductor and the male contact portion provided on the inner connection conductor is 0.1 [ mm], there is a problem that special considerations are required to increase the accuracy of assembling the connection between the coaxial terminal conductor and the coaxial reciprocating conductor, which increases the cost. .

Further, since the outer connection conductor and the inner connection conductor which constitute the coaxial reciprocating conductor are coaxially arranged with a slight space therebetween, when the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor is assembled, If the male contact portion and the female contact portion are eccentric, the inner connection conductor and the outer connection conductor of the coaxial reciprocating conductor may come into contact with each other and the current transformer may not function.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas-insulated current transformer in which the connection between the coaxial terminal conductor and the coaxial reciprocating conductor is prevented from being enlarged, and the structure is simplified to reduce the cost. To provide equipment.

Another object of the present invention is to provide a gas insulated current transformer which can easily attain the assembly accuracy required for using a louver contact.

[0014]

According to the present invention, there is provided a container having an opening hermetically closed by an insulating spacer and having an insulating gas sealed therein, a current transformer body accommodated in the container, and an insulating spacer. And a coaxial terminal conductor having an annular outer terminal conductor provided in a state penetrating therethrough and an inner terminal conductor coaxially provided inside the outer terminal conductor, and connected to one end of a primary coil of the current transformer main body. A coaxial reciprocating conductor having a hollow tubular outer connection conductor and an inner connection conductor coaxially disposed inside the outer connection conductor and connected to the other end of the primary coil, wherein the outer terminal conductor and the inner terminal conductor are provided. The present invention relates to a gas-insulated current transformer connected to one end and the other end of a primary coil of a current transformer main body via an outer connection conductor and an inner connection conductor, respectively.

In the present invention, the outer terminal conductor and the inner terminal conductor constituting the coaxial terminal conductor are connected to the sleeve-shaped first conductor.
Is positioned coaxially by fitting through the insulating member. Further, the outer connection conductor and the inner connection conductor of the coaxial reciprocating conductor are coaxially positioned by being fitted through a sleeve-shaped second insulating member, and female and female terminals are respectively provided on one and the other of the inner terminal conductor and the inner connection conductor. A contact portion and a male contact portion are provided, and the male contact portion is brought into contact with the female contact portion via a louver contact. Further, the outer terminal conductor and the outer connection conductor are connected via an adapter conductor provided so as to concentrically surround the female contact portion, and a sleeve-shaped second conductor interposed between the adapter conductor and the female contact portion. 3 is provided with an insulating member,
The female contact portion and the adapter conductor are concentrically positioned by the third insulating member.

As described above, the outer terminal conductor and the inner terminal conductor forming the coaxial terminal conductor are fitted with the insulator interposed therebetween, and the outer connection conductor and the inner connection conductor forming the coaxial reciprocating conductor are connected with the insulator interposed therebetween. With a structure in which the adapter conductor and the female contact portion are fitted together via an insulator, the connection between the coaxial terminal conductor and the coaxial reciprocating conductor is simply assembled in a predetermined order, and the center of these conductors is Since the axes can be aligned, assembly can be facilitated and cost can be reduced. In addition, since the center axes of the conductors constituting the coaxial terminal conductor and the coaxial reciprocating conductor can be always matched, the gap between the contact portions is always controlled to a size suitable for the use of the louver contact to obtain a predetermined conduction performance. be able to.

[0017]

FIG. 1 shows the structure of a gas-insulated current transformer according to the present invention. In FIG. 1, reference numeral 1 denotes a metal container having an opening 1a at an upper end, and 2 denotes an opening 1a of the container 1. Is a coaxial terminal conductor attached to the insulating spacer 2, 4 is a current transformer body accommodated in the container 1, 5 is a coaxial terminal conductor 3 and a current transformer body. And SF ₆ gas 6 is sealed in the container 1 at a predetermined pressure as an insulating gas.

The metal container 1 has a bottom 1b formed so that the profile of the vertical cross section has a substantially circular arc shape, and a mounting bracket 101 is welded to a portion near the bottom 1b.
The mounting bracket 101 includes a support 8 fixed to the base plate 7.
The metal container 1 is supported by the support base 8 with its axis oriented vertically. A flange fitting 102 is welded to the opening at the upper end of the container 1,
An annular flange plate 103 is bolted to the flange fitting 102.

The insulating spacer 2 is a well-known one formed of an insulating material such as an epoxy resin in a cone shape, and a flange portion 2 a formed on the outer periphery thereof is bolted to the flange plate 103.

As shown in detail in FIG. 2, the coaxial terminal conductor 3 includes an annular outer terminal conductor 301 attached in a state where the center of the insulating spacer 2 is airtightly penetrated, and an inner side of the outer terminal conductor. And a columnar inner terminal conductor 302 coaxially arranged. The outer terminal conductor 301 and the inner terminal conductor 302 are tightly fitted (in a fitting structure) and airtightly connected with the sleeve-like first insulating member 9 interposed therebetween. A portion of the inner terminal conductor 302 located in the container 1 is formed in a tubular shape,
The tubular portion forms a female contact portion 302a. By reducing the outer diameter of the distal end of the female contact portion 302a, a thin portion 302a1 is formed at the distal end of the contact portion 302a. In order to facilitate insertion of a male contact portion to be described later, a radius is attached to a portion inside the distal end portion of the thin portion 302a1.

The current transformer body 4 includes a primary coil 401 wound so as to have a predetermined number of turns (one turn in the illustrated example), and an annular core provided so as to link with the primary coil 401. And a secondary coil 402 wound around the coil. The primary coil 401 and the secondary coil 402 are each covered with an electric field relaxation shield, and are fixed to the container 1 by appropriate means.

Both ends of the primary coil 401 of the current transformer body 4 pass through a coaxial reciprocating conductor 5 provided between the current transformer body and the insulating spacer so as to extend along the central axis of the container 1. It is connected to the.

As shown in FIG. 2, the coaxial reciprocating conductor 5 is
It comprises a tubular outer connection conductor 501 provided coaxially with the outer terminal conductor 301 (with the axis shared) and an inner connection conductor 502 arranged inside the outer connection conductor 501. One end of the conductor 501 and one end of the inner connection conductor 502 are connected to one end and the other end of the primary coil 401, respectively. The outer connection conductor 501 and the inner connection conductor 502 are formed by a second sleeve-shaped second connection conductor.
And are positioned so as to share their respective axes.

At the other end of the inner connection conductor 502, a bar-shaped male contact portion 502a projecting from the other end of the outer connection conductor 501 toward the inner terminal conductor 302 is formed. A plurality of (three in the illustrated example) grooves are provided on the outer periphery of the male contact portion 502a in a state where they are arranged in the axial direction, and the louver contacts 11 are respectively mounted in these grooves. As shown in FIG. 4, the louver contact 11 is formed by forming a large number of slits on a plate made of a metal having good conductivity such as copper and deforming the edge portions of each slit so as to protrude from the plate surface. Thus, a large number of louver-shaped contact portions 11a are formed into a ring shape, and an edge portion of each contact portion 11a comes into contact with a contact portion on the other side.

The male contact portion 502a is inserted inside the female contact portion 302a formed on the inner terminal conductor 302 of the coaxial terminal conductor 3, and
Through the female contact portion 302a.

A tubular adapter conductor 12 is provided so as to coaxially surround the female contact portion 302a.
The flanges 12a and 12b provided at one end and the other end in the axial direction of the adapter conductor 12, respectively, are connected to the outer terminal conductor 301 and the outer connection conductor 50 by bolts 13 and 14, respectively.
1 connected. Enlarged diameter portions 12c and 12d are formed on the inner periphery of the end of the adapter conductor 12 on the outer terminal conductor 301 side and on the inner periphery of the end on the outer connection conductor 501 side, respectively. A sleeve-shaped third insulating member 15 interposed between the adapter conductor and the female contact portion is fitted. The thin portion 302a1 at the tip of the female contact portion 302a is fitted to the inner periphery of the insulating member 15, whereby the female contact portion 302a and the adapter conductor 12 are coaxially positioned. An electric field alleviating shield 16 is attached so as to cover the connection between the coaxial terminal conductor 3 and the coaxial reciprocating conductor 5.

FIG. 3 shows an example of a method of assembling a connecting portion between the coaxial terminal conductor 3 and the coaxial reciprocating conductor 5. In this example, first, the adapter conductor 12 is arranged so as to coaxially surround the female contact portion 302a, and the flange 12a at one end of the adapter conductor 12 is temporarily fixed to the outer terminal conductor 301 with bolts. Next, the sleeve-shaped third insulating member 15 is fitted and fixed in the gap between the inner circumference of the enlarged diameter portion 12d of the adapter conductor 12 and the thin portion 302a1 at the tip of the female contact portion 302a. Louver contact 1
The male contact portion 502a at the end of the coaxial reciprocating conductor 5 to which the connector 1 is attached is inserted inside the female contact 302a, and the flange 12d of the adapter conductor 12 is bolted to the outer connection conductor 501. Thereafter, the shield 16 is attached, and the assembly of the connection portion between the coaxial terminal conductor 3 and the coaxial reciprocating conductor 5 is completed.

As described above, the outer connection conductor 501, the inner connection conductor 502, and the insulating member 10 interposed between the two conductors are coaxially positioned by the fitting structure, and the adapter conductor 12 and the female contact portion 302a are insulated from each other. When the member 15 is coaxially positioned by a fitting structure,
By performing the assembly in a predetermined order, the outer terminal conductor 30
1. The center axes of the outer connection conductor 501, the inner terminal conductor 302, and the inner connection conductor 302 can be automatically matched. Therefore, the gap between the female contact portion 302a formed at the tip of the inner terminal conductor 302 and the male contact portion 502a formed at the tip of the inner connection conductor 502 can be reduced without particularly troublesome assembling work. Can be controlled to a size suitable for use, and the cost required for assembly can be reduced.

Further, when the connecting portion between the coaxial terminal conductor and the coaxial reciprocating conductor is formed by using the female contact and the male contact having the fitting structure as described above and the louver contact interposed between the contacts, the tulip is formed. The structure can be simplified as compared with the case where a contact is used.

In the above example, three louver contacts are provided, but the number of louver contacts can be increased or decreased according to the magnitude of the current that needs to flow to the primary side of the current transformer. According to the present invention, since the current capacity can be increased by increasing the number of louver contacts provided in the axial direction, without increasing the size of the connection between the coaxial terminal conductor and the coaxial reciprocating conductor, It is possible to cope with an increase in the primary conduction capacity.

In the above example, a female contact portion 302a is provided at the end of the inner terminal
Although the male contact portion 502a is provided at the end of the first terminal 1, the male contact portion may be provided at the end of the inner terminal conductor 302, and the female contact portion may be provided at the end of the inner connection conductor 502.

[0032]

As described above, according to the present invention, the outer terminal conductor and the inner terminal conductor of the coaxial terminal conductor are fitted via the insulator, and the outer connection conductor and the inner connection conductor of the coaxial reciprocating conductor are connected. A structure in which the adapter conductor and the female contact portion are fitted together through the insulator, while being fitted together via the insulator, and the connecting portions between the coaxial terminal conductor and the coaxial reciprocating conductor are simply assembled in a predetermined order. The center axes of the conductors are aligned so that the gap between the male and female contacts can be controlled to a size suitable for the use of louver contacts, facilitating assembly, Cost can be reduced.

In the present invention, the connection between the coaxial terminal conductor and the coaxial reciprocating conductor is formed by using the female contact and the male contact having the fitting structure and the louver contact interposed between the two contacts. The structure of the connecting portion can be simplified and the size can be reduced as compared with the case where a tulip contact is used.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration example of a gas-insulated current transformer according to the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is an assembly diagram for explaining an assembling order of main parts in FIG. 1;

FIG. 4 is a perspective view showing an example of a louver contact used in the gas-insulated current transformer of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Insulating spacer 3 Coaxial terminal conductor 301 Outer terminal conductor 302 Inner terminal conductor 302a Female contact part 4 Current transformer main body 401 Primary coil 402 Secondary coil 5 Coaxial reciprocating conductor 501 Outer connection conductor 502 Inner connection conductor 502a Male contact 9 first insulating member 10 second insulating member 11 louver contact 12 adapter conductor

Claims (1)

[Claims] 1. A container in which an opening is hermetically closed by an insulating spacer and an insulating gas is sealed therein, a current transformer body accommodated in the container, and a state penetrating the insulating spacer. A coaxial terminal conductor having an annular outer terminal conductor, an inner terminal conductor coaxially provided inside the outer terminal conductor, and a hollow tubular outer connection conductor connected to one end of a primary coil of the current transformer main body. And a coaxial reciprocating conductor having an inner connecting conductor coaxially arranged inside the outer connecting conductor and connected to the other end of the primary coil,
In the gas-insulated current transformer, wherein the outer terminal conductor and the inner terminal conductor are connected to one end and the other end of the primary coil of the current transformer main body via the outer connection conductor and the inner connection conductor, respectively, The inner terminal conductor is fitted and positioned coaxially via a sleeve-shaped first insulating member, and the outer connection conductor and the inner connection conductor are connected to a sleeve-shaped second insulation member.
And a female contact portion and a male contact portion are provided on one and the other of the inner terminal conductor and the inner connection conductor, respectively, and the male contact portion is a louver contact. The outer terminal conductor and the outer connection conductor are connected via an adapter conductor provided to coaxially surround the female contact portion, and the adapter conductor and the female A sleeve-shaped third insulating member is provided so as to be interposed between the female contact portion and the adapter conductor, and the female contact portion and the adapter conductor are coaxially positioned by the third insulating member. Characterized gas insulated current transformer.