阅读说明：本技术 开关柜穿墙套管用等电位连接装置 (Equipotential connecting device for wall bushing of switch cabinet ) 是由 马炳烈 于 2020-12-02 设计创作，主要内容包括：本发明涉及开关柜母排母线等电位连接技术领域,公开了一种开关柜穿墙套管用等电位连接装置,用于母线、母排穿墙时的绝缘保护和机械支撑；包括绝缘套管和设置于绝缘套管内的高压屏蔽网；所述绝缘套管内腔设置有与高压屏蔽网连接的金属螺母嵌件；铜母排穿过所述绝缘套管内腔；所述绝缘套管通过套管安装螺母安装与墙体上；铜母排长度方向除端部母线搭接和处于绝缘套管内腔中间的一段外,铜母排外表面包有绝缘层；所述铜母排通过S形弹簧与金属螺母嵌件连接。该类开关柜穿墙套管等电位连接装置,便于现场施工,具有与铜排导体接触稳定可靠的优点,对减少现场施工难度、保证质量、提高设备安全运行有显著益处。(The invention relates to the technical field of equipotential connection of bus bars of a switch cabinet, and discloses an equipotential connection device for a wall bushing of a switch cabinet, which is used for insulation protection and mechanical support when the bus bars and the bus bars penetrate through a wall; the high-voltage shielding device comprises an insulating sleeve and a high-voltage shielding net arranged in the insulating sleeve; a metal nut insert connected with the high-voltage shielding net is arranged in the inner cavity of the insulating sleeve; the copper busbar penetrates through the inner cavity of the insulating sleeve; the insulating sleeve is mounted on the wall body through a sleeve mounting nut; the length direction of the copper busbar is except for the end part bus lap joint and a section positioned in the middle of the inner cavity of the insulating sleeve, and the outer surface of the copper busbar is wrapped with an insulating layer; the copper busbar is connected with the metal nut insert through the S-shaped spring. This kind of cubical switchboard wall bushing equipotential connecting device, the site operation of being convenient for has with the reliable and stable advantage of copper bar conductor contact, has showing the benefit to reducing the site operation degree of difficulty, assurance quality, improve equipment safe operation.)

1. An equipotential connecting device for a wall bushing of a switch cabinet is used for insulation protection and mechanical support when a bus and a busbar penetrate through a wall; comprises an insulating sleeve (1) and a high-voltage shielding net (2) arranged in the insulating sleeve (1); a metal nut insert (3) connected with the high-voltage shielding net (2) is arranged in the inner cavity of the insulating sleeve (1); the copper busbar (4) penetrates through the inner cavity of the insulating sleeve (1); the insulating sleeve (1) is mounted on a wall body through a sleeve mounting nut (6); the length direction of the copper busbar (4) is characterized in that an insulating layer (7) is coated on the outer surface of the copper busbar (4) except for a section which is overlapped with the end part bus and is positioned in the middle of the inner cavity of the insulating sleeve (1); the method is characterized in that: the copper busbar (4) is connected with the metal nut insert (3) through an S-shaped spring (8); the S-shaped spring (8) comprises a first section (81), a second section (82) and a third section (83); a first bend is formed between the first section (81) and the second section (82); and a second bend is formed between the second section (82) and the third section (83).

2. The equipotential connection device for a bushing passing through a wall of a switchgear according to claim 1, wherein: the first section (81) of the S-shaped spring (8) is connected with the metal nut insert (3); the first section (81) is provided with an ear plate (84) which is used for being connected with the metal nut insert (3).

3. The equipotential connection device for a bushing passing through a wall of a switchgear according to claim 1, wherein: the third section (83) of the S-shaped spring (8) is in contact with the copper busbar (4); the tail end of the third section (83) is in a round roll shape; the contact between the third section (83) and the copper busbar (4) is line contact.

4. The equipotential connection device for a bushing passing through a wall of a switchgear according to claim 1, wherein: the first section (81) of the S-shaped spring (8) is inosculated with the inner cavity wall of the insulating sleeve (1).

5. The equipotential connection device for a bushing passing through a wall of a switchgear according to claim 1, wherein: the contact lines of the lug plates (84) and the third sections (83) and the copper busbar (4) are symmetrically distributed relative to the second section (82).

6. The equipotential connection device for a bushing passing through a wall of a switchgear according to claim 1, wherein: the S-shaped spring (8) is made of a non-magnetic stainless steel thin spring steel plate.

Technical Field

The invention relates to an equipotential connecting device, in particular to an equipotential connecting device for a wall bushing of a switch cabinet.

Background

Under the conditions that a 12kV or 40.5kV switch cabinet passes through a main bus between cabinets, and a bus is led in and out from a shell, a wall bushing is needed to be used as insulation protection and mechanical support, and an inner cavity is designed for the bus to pass through. In order to solve the electric field optimization problem of the structure formed by the bus high potential insulating sleeve and the grounding metal plate for installing the sleeve, a metal voltage-sharing shielding layer is arranged in the inner cavity of the sleeve, and a bus conductor is connected with the shielding layer, namely, equipotential connection is carried out. At present, most of the adopted equipotential connections use metal wires, one end of each metal wire is fixed on a nut reserved on a sleeve, and the other end of each metal wire needs to be fixed by punching holes on the busbar in the two ends of an inner cavity of the sleeve according to the position of the busbar after installation on a switch cabinet installation site. Such site operations present several significant problems: the position of the bus bar needs to be opened on site, the hole is not close to the central area of the inner cavity of the sleeve, so that the connection screw can be conveniently screwed, particularly, the construction is convenient, the length of the metal wire generally leaves a large margin, and the excessive part can not be fixed and can possibly extend out of the end face of the sleeve to cause the deterioration of an electric field. In addition, the spiral spring is used as an equipotential connecting piece, and the problems of inconvenient installation and poor fixation also exist.

Disclosure of Invention

The invention solves the technical problem of providing the equipotential connecting device for the wall bushing of the switch cabinet, which has the characteristics of convenience in installation, high use reliability and the like.

The technical scheme adopted by the invention for solving the technical problems is as follows: an equipotential connecting device for a wall bushing of a switch cabinet is used for insulation protection and mechanical support when a bus and a busbar penetrate through a wall; the high-voltage shielding device comprises an insulating sleeve and a high-voltage shielding net arranged in the insulating sleeve; a metal nut insert connected with the high-voltage shielding net is arranged in the inner cavity of the insulating sleeve; the copper busbar penetrates through the inner cavity of the insulating sleeve; the insulating sleeve is mounted on the wall body through a sleeve mounting nut; the length direction of the copper busbar is except for the end part bus lap joint and a section positioned in the middle of the inner cavity of the insulating sleeve, and the outer surface of the copper busbar is wrapped with an insulating layer; the copper busbar is connected with the metal nut insert through an S-shaped spring; the S-shaped spring comprises a first section, a second section and a third section; a first bend is arranged between the first section and the second section; and a second bend is formed between the second section and the third section.

Further, the method comprises the following steps: the first section of the S-shaped spring is connected with the metal nut insert; and the first section is provided with an ear plate used for being connected with the metal nut insert.

Further, the method comprises the following steps: the third section of the S-shaped spring is in contact with the copper busbar; the tail end of the third section is in a round roll shape; the contact between the third section and the copper busbar is line contact.

Further, the method comprises the following steps: the first section of the S-shaped spring is inosculated with the inner cavity wall of the insulating sleeve.

Further, the method comprises the following steps: and the contact lines of the lug plates, the third sections and the copper busbar are symmetrically distributed relative to the second section.

Further, the method comprises the following steps: the S-shaped spring is made of a non-magnetic stainless steel thin spring steel plate.

The invention has the beneficial effects that: according to the technical scheme, the copper busbar and the high-voltage shielding net are connected through the S-shaped spring, one end of the S-shaped spring is fixedly connected with the high-voltage shielding net, and the other end of the S-shaped spring is tightly pressed on the copper busbar by elasticity, so that the copper busbar and the high-voltage shielding net are convenient to construct on site.

Drawings

FIG. 1 is a schematic sectional view of an assembly of an insulating sleeve and a copper busbar;

FIG. 2 is a schematic sectional view of the assembly of the insulating sleeve and the copper busbar;

fig. 3 is a schematic structural view of an S-shaped spring.

Labeled as: 1. an insulating sleeve; 2. a high voltage shielding mesh; 3. a metal nut insert; 4. copper busbar; 6. mounting a nut on the sleeve; 7. an insulating layer; 8. an S-shaped spring; 81. a first stage; 82. a second stage; 83. a third stage; 84. an ear plate.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.

Examples

As shown in fig. 1 and fig. 3, an equipotential connecting device for a wall bushing of a switch cabinet is used for insulation protection and mechanical support when a bus and a busbar penetrate through a wall; the high-voltage shielding device comprises an insulating sleeve 1 and a high-voltage shielding net 2 arranged in the insulating sleeve 1; a metal nut insert 3 connected with the high-voltage shielding net 2 is arranged in the inner cavity of the insulating sleeve 1; the copper busbar 4 penetrates through the inner cavity of the insulating sleeve 1; the insulating sleeve 1 is arranged on a wall body through a sleeve mounting nut 6; except for the end bus lap joint and a section positioned in the middle of the inner cavity of the insulating sleeve 1 in the length direction of the copper busbar 4, the outer surface of the copper busbar 4 is wrapped with an insulating layer 7; the copper busbar 4 is connected with the metal nut insert 3 through an S-shaped spring 8; the S-shaped spring 8 comprises a first section 81, a second section 82 and a third section 83; a first bend is formed between the first section 81 and the second section 82; a second bend is formed between the second section 82 and the third section 83.

On the basis of the above, the first section 81 of the S-shaped spring 8 is connected with the metal nut insert 3; the first section 81 is provided with an ear plate 84 for connection with the metal nut insert 3.

The third section 83 of the S-shaped spring 8 is in contact with the copper busbar 4; the tail end of the third section 83 is in a round roll shape; the contact between the third section 83 and the copper busbar 4 is line contact. The spring is tightly pressed on the copper busbar 4 to provide proper contact force with the copper busbar 4, the line contact has the advantage of stable and reliable contact, and the circular coil shape can eliminate the problem of electric field concentration at the end part; the first section 81 of the S-shaped spring 8 is designed into a circular arc shape and is matched with the inner cavity wall of the insulating sleeve 1, so that the stability of the S-shaped spring 8 is improved. The contact lines of the lug plate 84 and the third section 83 with the copper busbar 4 are symmetrically distributed relative to the second section 82, namely the fixed point and the contact point of the S-shaped spring 8 are symmetrically distributed, and the stability is high.

In order to ensure that the S-shaped spring 8 has sufficient elasticity, a thin non-magnetic stainless steel spring plate is selected as a preparation material in the implementation.

The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent transformations fall within the protection scope of the present invention.