WO2013086773A1

WO2013086773A1 - Ultra-high-voltage direct-current wall bushing and support structure of central conductor thereof

Info

Publication number: WO2013086773A1
Application number: PCT/CN2012/000896
Authority: WO
Inventors: 韩国辉; 袁端磊; 王海燕; 李绍军; 朱志豪; 王小焕; 赵芳帅; 柴影辉
Original assignee: 平高集团有限公司
Priority date: 2011-12-15
Filing date: 2012-06-30
Publication date: 2013-06-20
Also published as: CN102457032A

Abstract

An ultra-high-voltage direct-current wall bushing and a support structure of a central conductor thereof. The central conductor of the wall bushing is divided into two parts, namely an indoor conductor (4) and an outdoor conductor (3). The indoor conductor and the outdoor conductor are fixed in a wall bushing body through the support structure arranged in the wall bushing body (1). The support structure is provided with a connecting contact head (2) which is used for fixedly connecting the indoor conductor and the outdoor conductor together. The connecting contact head is fixed on the inner wall of the wall bushing body through an insulator (5) which is fixedly connected with the connecting contact head. Because the length of the central conductor is formed by the lengths of the indoor conductor and the outdoor conductor, i.e., the longer length of the central conductor is formed by two general lengths or the shorter length, the problem of oversized deflection of the central conductor caused by overlong length of the central conductor is solved.

Description

Support structure for UHV DC wall bushing and its central conductor

[0001] The present invention relates to an ultra-high voltage direct current wall bushing used in the technical field of a direct current power transmission device, and to a support structure of a center conductor of the ultra high voltage through wall bushing.

Background technique

[0002] Existing UHV DC wall bushing design and manufacturing technology is ABB, SIEMENS (Siemens) and ALSTOM

(Alstom) The three companies are in control. Domestic manufacturers say that most of them have not yet been able to design and produce UHV DC wall bushings. At present, an UHV sulphur hexafluoride gas insulated DC through-wall bushing (Henan Pingyi Group's independent research and development) exists on the market to meet the technical requirements of China's UHV DC project. The book UHV hexafluoride gas insulated DC through-wall bushing has the characteristics of voltage grade 髙, large creepage distance and long center conductor. However, due to the longer length of the center conductor, the deflection of the center conductor is increased, thereby causing the electric field strength in the wall bushing to concentrate, and thus the wall bushing cannot reach the UHV hexafluoride gas insulated DC through wall bushing. Scheduled design requirements.

Summary of the invention

The present invention provides a support structure for a UHV DC wall bushing and a center conductor thereof, which aims to solve the problem of large deflection of the center conductor of the through-wall bushing in the prior art.

[0004] The technical solution of the UHV DC wall bushing is as follows:

A support structure for a center conductor of an UHV DC wall bushing, comprising a center conductor for being disposed in a tube body of the wall bushing, the center conductor being disconnected from the middle portion into two parts, an indoor conductor and an outdoor conductor, The indoor conductor and the outdoor conductor are fixedly connected by a connecting contact disposed therebetween, and an insulator for fixing the connecting contact in the tube of the through-wall bushing is fixed on the connecting contact.

[0005] The outer circumference of the connecting contact is provided with a groove for receiving an end of the corresponding connecting end at a connection with at least one of the indoor conductor, the outdoor conductor and the connecting contact, the groove is connected to the contact The inner recess of the head.

[0006] The connecting contact is provided with a T-shaped shielding cap at a position opposite to the connection of the insulator.

[0007] The outer circumference of the connecting contact is provided at a portion of the T-shaped shielding cap, and a recess recessed into the interior of the connecting contact for receiving the outer leakage end of the T-shaped shielding cap is provided.

[0008] The technical solution of the support structure of the center conductor of the UHV wall bushing is as follows:

The utility model relates to an UHV wall bushing, which comprises a wall conductor and a center conductor disposed inside the wall pipe. The center conductor is disconnected into two parts of an indoor conductor and an outdoor conductor, and the indoor conductor and the outdoor conductor pass through two The connecting contacts provided between the two are fixedly connected, and the connecting contacts are fixed inside the through-wall cylinder through insulators fixed on the outer circumference thereof, and one end of the insulator is fixed Description

It is fixed on the outer circumference of the connecting contact, and the other end is fixed on the peripheral wall of the wall-through pipe body.

[0009] a recess of the outer circumference of the connecting contact at least one of the indoor conductor, the outdoor conductor and the connecting contact is provided with a groove for receiving an end of the corresponding connecting end, the groove is connected to the contact The inner recess of the head.

[0010] The connecting contact is provided with a T-shaped shielding cap at a position opposite to the connection of the insulator.

[0011] The outer circumference of the connecting contact is provided at a portion of the T-shaped shielding cap with a recess recessed into the interior of the connecting contact for receiving the outer end of the T-shaped shielding cap.

[0012] The insulator is fixed on the peripheral wall of the wall bushing through a flange fixed on the peripheral wall of the wall pipe, and the flange is fixed on the outer end hole of the through hole opened in the peripheral wall of the wall pipe body. .

[0013] In the present invention, the center conductor is divided into two parts: an indoor conductor and an outdoor conductor, and the indoor conductor and the outdoor conductor are fixed in the through-wall pipe through a support structure provided in the wall pipe body, and the support structure has an indoor conductor. a connecting contact fixedly connected to the outdoor conductor, and the connecting contact is fixed on the inner wall of the through-wall pipe body through an insulator fixedly connected thereto, since the length of the center conductor is composed of the length of the indoor conductor and the outdoor conductor, that is, The longer length of the center conductor is composed of two general lengths or smaller lengths, thereby solving the problem that the center conductor is excessively deflected due to the excessive length of the center conductor, thereby avoiding the problem of electric field concentration in the wall bushing. . At the same time, since the wall bushing has a simple structure, the insulator, the connecting contact and the flange are common parts, the wall bushing has the characteristics of simple modification and low manufacturing cost. DRAWINGS

1 is a schematic structural view of an embodiment of the present invention.

detailed description

[0015] Embodiment of the UHV DC wall bushing of the present invention: As shown in FIG. 1, the UHV wall bushing is mainly composed of a cylindrical through-wall pipe body 1 and a center conductor, wherein the center conductor is from the middle Disconnected into two parts of the indoor conductor 4 and the outdoor conductor 3, the indoor conductor 4 and the outdoor conductor 3 are connected by a support structure provided in the through-wall pipe body 1, and the support structure is mainly composed of the connecting contact 2 and the column insulator 5. The connecting contact 2 is a hollow spherical connecting contact 2 between the indoor conductor 3 and the outdoor conductor 4, and the connecting contact 2 has a certain distance from the inner wall of the through-walled pipe body 1, and the connecting contact 2 is worn. The wall tube body 1 is fixedly connected by a column insulator 5 disposed therebetween, the 5 end of the insulator is fixedly connected to the connecting contact 2, and the other end is fixed on the inner end of the flange 6 fixed on the peripheral wall of the wall pipe body 1. The flange 6 is fixed on the outer end hole of the through hole which is formed at the position where the insulator 5 is disposed on the through-wall pipe body 1. In use, the wall bushing is composed of the indoor conductor 3 and the outdoor conductor 4 The center conductor can effectively use the existing technology The longer length of the in-process center conductor is shared on the two conductors, so that the lengths of the two conductors constituting the center conductor are generally or shorter, thereby avoiding the greater deflection of the center conductor due to the longer length of the center conductor. , the problem of concentrated electric field in the wall pipe body 1.

[0016] Meanwhile, the connection between the hollow spherical connecting contact 2 and the insulator 5, the indoor conductor 4, and the outdoor conductor 3 is provided Description

a recess recessed inside the connecting contact 2, the recess being capable of accommodating the ends of the insulator 5, the indoor conductor 4 and the outdoor conductor 3 such that the ends of the three are shielded by the peripheral wall of the connecting contact, The electric field distribution in the vicinity of the connection contact 2 is made more uniform, thereby reducing the adverse effect of the connection contact 2 and the insulator 5 on the electric field distribution inside the through-wall sleeve.

[0017] In addition, a T-shaped shielding cap is mounted on the connecting contact opposite to the connecting portion, and the T-shaped shielding cap has a thread on the bottom cylinder to ensure a more reliable connection between the connecting contact and the insulator. The connecting contact is disposed at a position of the τ-shaped shielding cap, and is provided with an arc-shaped groove recessed inside the connecting contact for receiving the outer leakage end of the τ-shaped shielding cap, the groove and the upper circular cover of the τ-shaped visor cap Reduce the concentration of the electric field near the connection contacts.

[0018] In the above embodiment, the insulator is fixed on the flange fixed on the peripheral wall of the wall pipe. In other embodiments, the insulator may also be directly fixed on the inner wall of the wall pipe.

[0019] In the above embodiment, it can be seen from FIG. 1 that the fixed connection between the various components of the wall bushing is screwed. In other embodiments, the connecting structure can also be a common fixed connection such as welding. the way.

[0020] Embodiment of the support structure of the center conductor of the UHV wall bushing of the present invention: The support structure of the center conductor has been specifically described in the above embodiment, and therefore will not be described in detail in this embodiment.

Claims

Claim

A support structure for a center conductor of a UHV DC through-wall bushing, comprising a center conductor for being disposed within a body of an adapted through-wall bushing, wherein: said center conductor is disconnected from the center The indoor conductor and the outdoor conductor are fixedly connected by a connecting contact disposed therebetween, and the connecting contact is fixed with a fixing member for fixing the connecting contact to the through-wall bushing. Insulator inside the tube.

The support structure of the center conductor of the UHV DC wall bushing according to claim 1, wherein: the outer circumference of the connecting contact is on at least one of the indoor conductor, the outdoor conductor and the connecting contact A groove for receiving the end of the corresponding connecting end is provided at the junction therewith, and the groove is recessed toward the inside of the connecting contact.

3. The support structure of the center conductor of the UHV DC wall bushing according to claim 1, wherein: the connecting contact is provided with a T-shaped shield cap at a position opposite to the joint of the insulator.

The support structure of the center conductor of the UHV DC wall bushing according to claim 3, wherein: the outer circumference of the connecting contact is provided at the position of the T-shaped shield cap to the inside of the connecting contact A recessed recess for receiving the outer leakage end of the T-shaped shield cap.

5. An UHV wall bushing comprising: a through-wall pipe body and a center conductor disposed in the wall pipe body, wherein: the center conductor is disconnected into two parts, an indoor conductor and an outdoor conductor, the indoor unit The conductor and the outdoor conductor are fixedly connected by a connecting contact provided therebetween, and the connecting contact is fixed inside the through-wall cylinder through an insulator fixed on the outer circumference thereof, and one end of the insulator is fixed on the outer circumference of the connecting contact The other end is fixed to the peripheral wall of the wall pipe.

The UHVDC bushing according to claim 5, wherein: the outer circumference of the connecting contact is provided at a junction of at least one of the indoor conductor, the outdoor conductor and the connecting contact The recess is for receiving the end of the corresponding connecting end, and the recess is recessed toward the inside of the connecting contact.

The UHVDC bushing according to claim 5, wherein the connecting contact is provided with a T-shaped shield cap at a position opposite to the joint of the insulator.

The UHV DC wall bushing according to claim 7, wherein: the outer circumference of the connecting contact is provided at a position of the T-shaped shielding cap, and is recessed toward the inside of the connecting contact for containing T The groove of the outer leakage end of the shield cap.

The UHVDC bushing according to any one of claims 5 to 8, wherein the insulator is fixed to the peripheral wall of the wall bushing by a flange fixed on a peripheral wall of the wall pipe body. The flange is fixed on the outer end hole of the through hole formed in the peripheral wall of the wall pipe body.