阅读说明：本技术 一种带隔离开关的电压互感器柜 (Voltage transformer cabinet with isolating switch ) 是由 莫绍肆 唐梅生 于 2020-10-22 设计创作，主要内容包括：本发明公开了一种带隔离开关的电压互感器柜,包括气箱和PT室；所述气箱和PT室通过内锥插座连接；所述气箱内充有绝缘气体并密封有相互连接的三工位开关和母线部分；所述气箱的顶部设置有接地部分；所述接地部分安装在充有绝缘气体的隔室内；所述PT室安装有电压互感器；所述气箱的出线端设置有内锥插座；所述电压互感器的一端通过PT插头与内锥插座连接。本发明具有体积更小、安装维护方便、环境适应性更强、全绝缘全密封、相间屏蔽和相间隔离、运行安全可靠的优点。(The invention discloses a voltage transformer cabinet with an isolating switch, which comprises an air box and a PT chamber; the air box is connected with the PT chamber through an inner cone socket; the air box is filled with insulating gas and is sealed with a three-position switch and a bus part which are connected with each other; the top of the gas box is provided with a grounding part; the ground part is installed in a compartment filled with an insulating gas; the PT chamber is provided with a voltage transformer; an inner cone socket is arranged at the wire outlet end of the gas box; one end of the voltage transformer is connected with the inner cone socket through a PT plug. The invention has the advantages of smaller volume, convenient installation and maintenance, stronger environmental adaptability, full insulation and full sealing, inter-phase shielding and isolation, and safe and reliable operation.)

1. A voltage transformer cabinet with an isolating switch is characterized by comprising an air box and a PT chamber; the air box is connected with the PT chamber through an inner cone socket; the air box is filled with insulating gas and is sealed with a three-position switch and a bus part which are connected with each other; the top of the gas box is provided with a grounding part; the ground part is installed in a compartment filled with an insulating gas; the PT chamber is provided with a voltage transformer; an inner cone socket is arranged at the wire outlet end of the gas box; one end of the voltage transformer is connected with the inner cone socket through a PT plug.

2. The voltage transformer cabinet with isolating switch as claimed in claim 1, wherein the insulating gas is SF₆Or N₂。

3. The voltage transformer cabinet with the isolating switch as claimed in claim 1, wherein a buffer layer is arranged at the front end of the PT plug; the buffer layer is provided with a spring contact finger; the spring contact fingers are mounted in the inner cone socket.

4. The voltage transformer cabinet with the isolating switch as claimed in claim 3, wherein the buffer layer is made of rubber.

5. The voltage transformer cabinet with the isolating switch as claimed in claim 1, wherein the housing of the PT chamber is provided with a conductive shielding layer.

6. The voltage transformer cabinet with the isolating switch as claimed in claim 1, further comprising a cabinet body part and a mechanism room arranged side by side; the air box is arranged at the rear side of the mechanism chamber; the PT chamber is arranged at the rear side of the cabinet body part.

7. The voltage transformer cabinet with the isolating switch as claimed in claim 6, wherein a three-position switch operating mechanism is arranged in the mechanism chamber; the three-position switch operating mechanism is horizontally connected with the three-position switch; and the end part of the mechanism chamber is also provided with a secondary control chamber.

Technical Field

The invention belongs to the technical field of manufacturing of power equipment, and particularly relates to a voltage transformer cabinet with an isolating switch.

Background

The high-voltage transformer cabinet which is applied more in the current ring main unit power supply system is a three-phase voltage transformer which is arranged in a cabinet body and has monitoring and sampling functions, the three-phase voltage transformer obtains a high-voltage power supply from a bus connecting seat arranged on the cabinet body through an exposed conducting wire row, a high-voltage fuse is connected in series in a primary wire loop of the voltage transformer, the high-voltage fuse is exposed in the air, the primary wire is connected by taking the air as an insulating medium, the requirement on the insulation distance between phases and relative ground is large, a large installation space is required under the condition of meeting the air insulation distance, and the size of the whole cabinet is large and is not suitable for the requirement on the miniaturization design of electrical equipment.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a voltage transformer cabinet with an isolating switch, so as to solve the problems of larger cabinet body and poorer insulation of the voltage transformer cabinet in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

a voltage transformer cabinet with an isolating switch comprises an air box and a PT chamber; the air box is connected with the PT chamber through an inner cone socket; the air box is filled with insulating gas and is sealed with a three-position switch and a bus part which are connected with each other; the top of the gas box is provided with a grounding part; the ground part is installed in a compartment filled with an insulating gas; the PT chamber is provided with a voltage transformer; an inner cone socket is arranged at the wire outlet end of the gas box; one end of the voltage transformer is connected with the inner cone socket through a PT plug.

Further, the insulating gas is SF₆Or N₂。

Further, a buffer layer is arranged at the front end of the PT plug; the buffer layer is provided with a spring contact finger; the spring contact fingers are mounted in the inner cone socket.

Further, the buffer layer is made of a rubber material.

Further, the housing of the PT chamber is provided with a conductive shielding layer.

Further, the voltage transformer cabinet also comprises a cabinet body part and a mechanism chamber which are arranged side by side; the air box is arranged at the rear side of the mechanism chamber; the PT chamber is arranged at the rear side of the cabinet body part.

Furthermore, a three-position switch operating mechanism is arranged in the mechanism chamber; the three-position switch operating mechanism is horizontally connected with the three-position switch; and the end part of the mechanism chamber is also provided with a secondary control chamber.

Compared with the prior art, the invention has the following beneficial effects:

1. the three-position switch and the bus are partially sealed in the gas box filled with insulating gas, and the grounding part is arranged in the compartment filled with the insulating gas, so that the insulating capability of parts is greatly improved, and the insulating property is good.

2. Using N₂As the insulation in the air box and the compartment, the influence on the environment is reduced to the greatest extent, and the purpose of a green switch cabinet is realized.

3. The front end conductor of the voltage transformer adopts a spring contact finger structure design, so that the effective contact of the conductor can be ensured in a larger error range, and in addition, the flexible rubber material is adopted, so that air is continuously discharged in the installation process, the unevenness of a high-voltage electric field can be reduced to a greater extent, the possibility of breakdown is reduced, and the performance is more stable.

4. The air box, the cabinet body part, the mechanism chamber and the PT chamber are designed in a modularized way, so that the whole structure is simple, the size is small, and the maintenance is convenient; the direct plug-in type of pulling out between different modules is connected, and the structure is very simple, at the effectual size that has reduced the shell, when realizing miniaturized design theory, can maintain and change the mould at the operation scene easier.

5. The high-voltage electrified switch device has the advantages that the environmental adaptability is high, the operation is safer and more reliable, the connection between the modules of the high-voltage electrified part achieves complete sealing, so that the high-voltage electrified part cannot be influenced when the switch device can work in different severe environments, and the safety and the reliability of the operation of the switch device are improved.

Drawings

FIG. 1 is a right side view of the present invention;

FIG. 2 is a rear view of the present invention;

FIG. 3 is a cross-sectional view of a voltage transformer of the present invention;

FIG. 4 is a cross-sectional view of the PT plug of the present invention;

fig. 5 is a rear bulkhead view of the invention.

Reference numerals: 1-a gas tank; 2-a cabinet portion; 3-a mechanism chamber; 4-PT chamber; 5-a voltage transformer; 6, mounting a plate; 7-inner cone socket; 8-copper bar; 9-three-position switch; 10-a ground portion; 11-bus section; 12-a guide rail; 13-fixing the plate; 14-PT plug; 15-spring contact fingers; 16-rear plug; 17-a fusible core; 18-a secondary control room; 19-a buffer layer; 20-three-position switch operating mechanism.

Detailed Description

The present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1-5, a voltage transformer cabinet with an isolating switch comprises an air box 1, a cabinet body part 2, a mechanism chamber 3 and a PT chamber 4; the cabinet body part 2 and the mechanism chamber 3 are arranged side by side; the air box 1 is arranged at the rear side of the mechanism chamber 3; the PT room 4 is provided at the rear side of the cabinet portion 2; the connection of the air box 1 and the PT chamber 4 is provided with an internal cone socket 7.

The air box 1 is filled with insulating gas and sealed with a three-position switch 9 and a bus part 11, the bus part 11 is connected with the three-position switch 9 and is connected and conducted through a copper bar, the A, B, C three phases of the bus part 11 meet the requirements of front, middle and rear, and the moving end of the three-position switch 9 is connected with the bus part 11 when the switch is switched on; the three-position switch 9 is connected with the inner cone socket 7 through a copper bar 8; the ground part 10 is installed in a compartment filled with an insulating gas and disposed on the top of the gas tank 1; the bus part 11, the grounding part 10 and the three-position switch 9 are sealed in a single compartment filled with insulating gas, so that the contact is completely prevented from being influenced by the external environment; the insulating gas may be SF6 or N2 or dry air, etc.

A three-position switch operating mechanism 20 is arranged in the mechanism chamber 3, and the three-position switch operating mechanism 20 is horizontally connected with the three-position switch 9 and used for driving the three-position switch 9 to be switched on and off; the end of the mechanism chamber 3 is also provided with a secondary control chamber 18, and the secondary control chamber 18 is used for installing monitoring instruments, control buttons, indicator lamps and indicating instruments and protecting and controlling power supply lines.

And a voltage transformer 5 is arranged in the PT chamber 4 and used for providing a power supply for protecting measuring equipment, and the voltage transformer 5 and the inner cone socket 7 are connected in a pull-plug manner and realize full insulation.

The voltage transformer 5 is connected with the PT chamber 4 in a sliding mode through a mounting plate 6 and a guide rail 12, and the connected voltage transformer 5 is mounted in the PT chamber 4 through a fixing plate; the sliding connection can reduce the collision to the voltage transformer 5 and the injury to installation personnel; the front end of the voltage transformer 5 is provided with a PT plug 14, the rear end is provided with a rear plug 16 for installing and replacing a fusible core 17, and the lower end is provided with an installation hole; PT plug 14's front end is provided with buffer layer 19, it touches and indicates 15 to install the spring on buffer layer 19, the spring touches and indicates 15 to install in interior cone socket 7, voltage transformer 5 installs the back well, because the spring touches and indicates 15 to have flexible characteristic, can effectual contact interior cone socket 7's electric conductor, and buffer layer 19 material mainly chooses soft rubber materials such as ternary second third of ten heavenly stems, spring touches and indicates 15 constantly extrudes the inside air of interior cone socket 7 in the installation, reach airless state at last, make whole cabinet be the state of full insulation full-enclosed, PT room 4's main body cover spouts to lead has the electric shielding layer.

The outlet end of the air box 1 adopts an inner cone socket 7, and the voltage transformer 5 matched with the inner cone socket is designed into a plug mode, so that the conventional cable accessories or copper bar connection can be reduced, the manual production can be effectively reduced, and the equipment size is reduced.

The compartments such as the mechanism chamber 3, the secondary control chamber 18, the PT chamber 4, and the gas tank 1 are individually partitioned.

Above-mentioned high-voltage live module is through sealed, all insulation setting, and 4 surperficial preparation in PT room have electrically conductive shielding layer to be connected with ground, thereby realize alternate isolation and shielding, can effectively restrain the production of pressure notes piece surface induced voltage and can in time lead away a small amount of induced voltage, guarantee operating personnel's safety.

The PT plug 14 conductor at the front end of the voltage transformer 5 adopts the spring contact finger 15, can effectively conduct electricity and contact, and enables installation tolerance to be enlarged, and is easy to produce.

And finally, conductive shielding layers are manufactured on the surfaces of all the high-voltage charged parts of the pressure injection parts and are connected with the ground, so that the voltage transformer cabinet is isolated and shielded mutually, the generation of induced voltage on the surfaces of the pressure injection parts can be effectively inhibited, a small amount of induced voltage can be guided away in time, and the safety of operators is ensured.

All intermodule junctions are the connection of plug-in type to make things convenient for switchgear's maintenance, practice thrift the running cost, the intermodule is sealed and is insulated with the silicon rubber spare when connecting.

The setting of PT room surface electric shield layer, each module and earth lug connection, the three-phase independently has the epoxy that insulating properties is good to separate moreover, realizes three alternate shielding and alternate isolation, avoids the diffusion of trouble when effectively restraining insulating part surface induction voltage's production, improves the operational reliability of product, saves running cost. The invention solves the defects of poor insulating capability and large volume of the medium-voltage switch with voltage mutual inductor equipment,

the embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.