CN107946026B

CN107946026B - External current transformer for transformer

Info

Publication number: CN107946026B
Application number: CN201711161545.0A
Authority: CN
Inventors: 张伟明; 高珊珊; 黄洁; 魏理明; 刘秀凤; 徐君江
Original assignee: Baoding Tianwei Mutual Inductor Co ltd
Current assignee: Baoding Tianwei Mutual Inductor Co ltd
Priority date: 2017-11-21
Filing date: 2017-11-21
Publication date: 2020-08-21
Anticipated expiration: 2037-11-21
Also published as: CN107946026A

Abstract

The invention relates to an external current transformer for a transformer, and belongs to the technical field of transformer manufacturing. The technical scheme is as follows: the damp-proof current transformer (5) is arranged in the box body (4), a lifting bar (3) is welded on the outer side of the box body (4), the lifting bar (3) is connected with a tripod welded on a transformer shell, a primary conductor is arranged at the center of the damp-proof current transformer (5), two ends of the primary conductor extend out of the box body (4), a heat-shrinkable tube (2) is arranged outside the primary conductor (1), the primary conductor (1) is fixed with the fixing plate (7) through an insulating screw (8), and the fixing plate (7) is fixed with the inner wall of the box body (4). The invention has the following positive effects: the current transformer is arranged externally, so that the test and the maintenance are convenient; the box body is welded with a lifting bar, so that the box body is convenient to lift; an independent secondary outlet box is arranged, so that equipment can be conveniently connected; a heat shrinkable tube is arranged outside the primary conductor, so that the insulating structure is simple; the primary conductor is firmly fixed with the box body, is convenient to disassemble and assemble and is convenient to transport.

Description

External current transformer for transformer

Technical Field

The invention relates to an external current transformer for a transformer, and belongs to the technical field of transformer manufacturing.

Background

At present, a bushing type current transformer for a transformer is assembled in a transformer lifting seat and is immersed in oil, the current transformer is inconvenient to wire and test when the transformer is tested and checked and daily inspection is carried out, and if the current transformer in the lifting seat has problems, the maintenance and the replacement are also difficult; before the transformer lifting seat is assembled to the transformer, the current transformer is transported with oil, so that inconvenience is brought to production.

Disclosure of Invention

The invention aims to provide an external current transformer for a transformer, which is internally provided with a moisture-proof current transformer, a detachable primary conductor and an external current transformer, is convenient to test and maintain and solves the problems in the prior art.

The technical scheme of the invention is as follows:

the utility model provides an external current transformer for transformer, contains primary conductor, pyrocondensation pipe, lifting bar, box (4), dampproofing current transformer, fixed plate and insulating screw rod, dampproofing current transformer sets up in the box, and the welding of the box outside has the lifting bar, and the lifting bar couples with the tripod that welds on transformer case, and primary conductor sets up at dampproofing current transformer central point, is equipped with the pyrocondensation pipe outside the primary conductor, and both ends are stretched out outside the box, and primary conductor passes through insulating screw rod and fixed mutually with the fixed plate, and the fixed plate is fixed mutually with the box inner wall, and primary conductor can dismantle.

The primary conductor is a copper bus or an aluminum bus.

The primary conductor is detachable.

The fixed plate is made of insulating materials.

And a secondary outlet box is arranged on the box body.

The box body is welded with a lifting bar which is convenient for lifting and is connected with a tripod welded on the transformer shell. The primary conductor is a copper bus (or an aluminum bus), passes through the center of the current transformer and is detachable. A heat-shrinkable tube is arranged outside the primary conductor and extends out of the box body for a certain distance, so that the primary conductor and the box body are prevented from being in insulation breakdown. The primary conductor is fixed with the fixing plate through the insulating screw rod, the fixing plate is fixed with the inner wall of the box body, and the fixing plate is an insulating piece and prevents the primary conductor from being punctured by the box body.

The invention has the following positive effects: the current transformer is arranged externally, so that the test and the maintenance are convenient; the box body is welded with a lifting bar, so that the box body is convenient to lift; an independent secondary outlet box is arranged, so that equipment can be conveniently connected; a heat shrinkable tube is arranged outside the primary conductor, so that the insulating structure is simple; the primary conductor is firmly fixed with the box body, is convenient to disassemble and assemble and is convenient to transport.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic side view of the present invention;

in the figure: the device comprises a primary conductor 1, a heat shrinkable tube 2, a lifting bar 3, a box body 4, a damp-proof current transformer 5, a secondary outlet box 6, a fixing plate 7 and an insulating screw 8.

Detailed Description

The invention is further described with reference to the following figures and examples:

the utility model provides an external current transformer for transformer, contains primary conductor 1, pyrocondensation pipe 2, lifting tab 3, box 4, dampproofing current transformer 5, fixed plate 7 and insulating screw rod 8, dampproofing current transformer 5 sets up in box 4, and the welding of box 4 outside has lifting tab 3, and lifting tab 3 couples with the tripod of welding on the transformer housing, and primary conductor sets up at dampproofing current transformer 5 central point, and both ends stretch out outside box 4, and primary conductor 1 is equipped with pyrocondensation pipe 2 outward, and primary conductor 1 is fixed mutually with fixed plate 7 through insulating screw rod 8, and fixed plate 7 is fixed mutually with box 4 inner wall.

The primary conductor 1 is a copper bus or an aluminum bus.

The primary conductor 1 is detachable.

The fixing plate 7 is made of an insulating material.

And a secondary outlet box 6 is arranged on the box body 4.

The box body is welded with a lifting bar for facilitating lifting, and is connected with a tripod welded on the transformer shell, the primary conductor is a copper bus and penetrates through the center of the current transformer, and the secondary outlet wire is led out from the secondary outlet box independently. The heat shrinkable tube is arranged outside the primary conductor, so that the insulating structure is simple. The primary conductor is fixed with the fixing plate through the insulating screw rod, the fixing plate is fixed with the inner wall of the box body, and the fixing plate is an insulating piece and prevents the primary conductor from creeping with the box body. The moisture-proof current transformer 5 avoids the trouble of transferring with oil. The box is the CT box, wholly external, and convenient experiment, maintenance. The primary conductor is firmly fixed with the box body, is convenient to disassemble and assemble and is convenient to transport.

Claims

1. The utility model provides an external current transformer for transformer which characterized in that: contain primary conductor (1), pyrocondensation pipe (2), lifting bar (3), box (4), dampproofing current transformer (5), fixed plate (7) and insulating screw rod (8), dampproofing current transformer (5) set up in box (4), and box (4) outside welding has lifting bar (3), lifting bar (3) and the tripod hookup of welding on transformer housing, and the primary conductor sets up at dampproofing current transformer (5) central point, and primary conductor (1) is equipped with pyrocondensation pipe (2) outward, and outside box (4) was stretched out at both ends, primary conductor (1) was fixed mutually with fixed plate (7) through insulating screw rod (8), and fixed plate (7) are fixed mutually with box (4) inner wall, and primary conductor (1) can be dismantled.