KR101549930B1 - Gas Insulated Switchgear Bushing-type Current Transformer - Google Patents

Abstract

The present invention relates to a gas insulated switchgear bushing-type current transformer capable of saving the number of working processes by installing a current transformer to which a protection pad of block-type rubber is attached in manufacturing the current transformer. The current transformer of the present invention is formed by attaching the protection pad of block-type rubber with a predetermined size to the upper and lower parts and the inner part. Thereby, the number of processes and rubber costs can be saved in installing an external case. An air space part is formed between a bushing-type current transformer (BCT) wires to achieve heat radiation effect.

Description

Gas Insulated Switchgear Bushing-type Current Transformer

[0001] The present invention relates to a gas insulated transformer, more particularly, to a transformer (BCT) having a block-shaped protective pad made of rubber to manufacture an integrated transformer, thereby reducing the number of workpieces when the transformer is mounted on an enclosure, Insulated type current transformer.

The substation is located in the middle of the transmission and distribution system and performs the role of boosting and lowering the transmission voltage, concentrating and distributing the transmission power, adjusting the voltage, and protecting and monitoring various power devices of the transmission system.

In an effort to improve the insulation performance of electric power equipment, there was a gas insulated switchgear (GIS) substation that housed all power devices in a metal container filled with SF6 gas, which has excellent dielectric strength.

The construction principle of GIS is a collection of switching devices composed of electric power devices that contain conductive metal conductors in a cylindrical metal enclosure filled with SF6 gas with excellent insulation performance.

A bushing-type current transformer (BCT), which is one of the main components of a GIS substation, is a device used to operate a measuring instrument or protective relay by changing a large current flowing on the line to a small current that is easy to handle , The structure and size are different depending on the variation ratio, the error class, and the rated burden.

In the current transformer (BCT), when a current (primary current) flows through the GIS conductor, a magnetic flux is generated in the iron core, a secondary current proportional to the CT winding is induced by electromagnetic induction, It is used to protect the power system by indirectly measuring the primary current by supplying it to the relay or by using it as the energy source of the protection relay.

Conventionally, as shown in FIG. 1, when the winding product of the current transformer is mounted on the enclosure tank, the rubber plate 120 is wrapped around the outer circumference of the inner diameter 110, which is positioned at the center of the enclosure 100, (BCT) 200 is laid on the rubber plate 130 in the form of a disk, and then the rubber plate 130 is laid on the top surface of the transformer (BCT) 200.

That is, the rubber plate 130 in the form of a disk is inserted and assembled between the cores of the current transformer (BCT) 200 on which the disk is mounted.

At this time, the rubber plates 120 and 130 serve to protect against external shocks and vibration during opening and closing of gas insulation.

However, since conventional rubber assemblies need to be separately assembled on the top and bottom and inside of the conventional current transformer, there are various disadvantages such as a time-consuming and troublesome work, an increase in manufacturing cost due to material costs, and the like.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems, and an object of the present invention is to provide a transformer (BCT) Insulated type current transformer.

In order to achieve the above object, a gas insulated current transformer of the present invention comprises a protection pad integrally formed on an upper surface, a lower surface, and an inner circumferential surface of a current transformer (BCT).

In the gas insulated current transformer of the present invention, it is preferable that the protection pad is formed of a rubber material in the form of a block and is attached to the top and bottom surfaces of the current transformer (BCT) at predetermined intervals.

In the gas insulated current transformer of the present invention, it is preferable that the protection pad is attached along the inner circumferential surface of the current transformer (BCT).

The gas insulated type current transformer according to the present invention can reduce the rubber material cost compared to the disk type by attaching a protection pad made of a rubber material in the form of a block to the top and bottom and inside of the current transformer (BCT) In addition, it is possible to reduce the number of workings at the time of assembling to the enclosure, thereby reducing manufacturing cost.

The gas-insulated current transformer of the present invention also has a heat dissipating effect by providing a predetermined number of block-shaped rubber plates on the upper and lower portions of a current transformer (BCT) coil to form a space in a portion to which no rubber block is attached.

1 is a view showing a conventional transformer (BCT) assembled state,
2 is a perspective view showing a gas insulated transformer (BCT) according to the present invention,
3 is a plan view showing a gas insulated transformer (BCT) according to the present invention,
4 is a cross sectional view showing a gas insulated transformer (BCT) according to the present invention,
5 is a view showing a gas insulated transformer (BCT) assembled state according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 2 to 4 show a perspective view, a plan view and a sectional view, respectively, of the gas insulated transformer according to the present invention.

As shown in Figs. 2 to 4, the winding of the current transformer (BCT) 10 according to the present invention is an insulated winding while being wound in a copper wire on the core 11 to produce a coiled product. At this time, the protective pads 20 of a predetermined size are adhered to the upper and lower portions and the inner portions, respectively, so as to be integrally formed.

Here, the protection pad 20 is made of a rubber material, and serves to protect the current transformer 10 by preventing shocks and reducing vibrations when the gas insulated switch is opened and closed.

The protection pad 20 is attached to the upper and lower portions of the coil of the current transformer (BCT) 10 at predetermined intervals, and in this embodiment, the protection pad 20 is attached at five places each 3T × 50 × 75 in the top and bottom.

The protection pad 20 is also attached to the inner side of the core of the current transformer (BCT) 10 in a size of 3T x W (inner diameter height) x L (circumference).

The coiled product of the current transformer (BCT) 10 to which the protective pad 20 in the form of a block is attached is assembled to the injection-molded enclosure 100.

5, the assembling process will be described in detail. A method of manufacturing a transformer (BCT) 10 in which a protection pad 20 is integrally formed through an inner diameter 110 of a conductor formed in an enclosure 100, So that it is only necessary to assemble it to the enclosure 100. [

At this time, the block rubber of the protection pad 20 attached to the upper surface of the transformer (BCT) 10 and the block rubber of the protection pad 20 attached to the lower surface of the transformer (BCT) So as to be in contact with each other. Therefore, even if the thickness of the block rubber of the protection pad 20 is not increased, the thickness of the protection pad 20 can be secured to withstand impact or vibration, and the material and cost can be saved.

As described above, according to the present invention, since the disk type rubber packing is not separately assembled between the corrugated cardboard (BCT) cores when the coiled product of the current transformer is incorporated in the enclosure, the number of operations can be saved.

In addition, the air space portion 30 is formed between the current transformer (BCT) spools stacked by the protective pad in the form of a block integrally attached to the current transformer (BCT) spool so that the high current is generated in the current transformer BCT Heat radiating effect is generated.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the equivalents of the claims, as well as the following claims.

10: Current transformer (BCT) 20: Protection pad
30: space portion

Claims (6)

And a protection pad integrally formed on the top and bottom surfaces and the inner circumferential surface of the current transformer (BCT). The gas insulated switch according to claim 1, wherein the protection pad is formed of a rubber material in a block shape. 3. The gas insulated type current transformer of claim 2, wherein the protection pad is attached to the upper surface and the lower surface of the current transformer body at a predetermined interval. 3. The gas insulated converter according to claim 2, wherein the protection pad is attached along an inner circumferential surface of the current transformer. The gas insulated type current transformer according to claim 3, wherein a heat dissipating space is formed between the current transformers (BCT) when the current collectors (BCT) integrally formed with the protection pads are mounted on the enclosure. The method of claim 3, further comprising: attaching a block rubber attached to an upper surface of a lower current transformer (BCT) and a lower surface of a current transformer (BCT) located at the upper portion when the protection pads (BCT) Insulated type current transformer is laminated so that the block rubber abuts against each other.

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