CN219592001U

CN219592001U - Novel three-station switch shell of gas-insulated metal-enclosed switchgear

Info

Publication number: CN219592001U
Application number: CN202320510580.3U
Authority: CN
Inventors: 王明状; 陈国平; 欧献军
Original assignee: Chang Hi Tech New Technology Co ltd; Hunan Changgao Electric Co ltd
Current assignee: Chang Hi Tech New Technology Co ltd; Hunan Changgao Electric Co ltd
Priority date: 2023-03-16
Filing date: 2023-03-16
Publication date: 2023-08-25
Anticipated expiration: 2033-03-16

Abstract

The utility model relates to the technical field of gas-insulated metal-enclosed switches, in particular to a novel three-station switch shell of gas-insulated metal-enclosed switchgear, which comprises: the side wall is square, four corners of the side wall are elliptical, and the side wall has the effects of increased area, good heat dissipation and small external dimension; the three-station switch shell consists of a first flange, a second flange, a grounding seat and a radiating fin. The three-position switch adopting the shell is consistent with the original size in the assembly interval, thereby meeting the requirements of the transformation of the national grid mixed gas and the newly-built mixed gas combined electrical appliance. The mixed gas requirements are met, the land for the transformer substation is saved, the replacement and transformation of the original sulfur hexafluoride medium combined electrical appliance can be met under the condition that the size and the interval width of the underframe are not increased, the power failure time is shortened, and the loss caused by the power failure is greatly reduced.

Description

Novel three-station switch shell of gas-insulated metal-enclosed switchgear

Technical Field

The utility model relates to the technical field of gas-insulated metal-enclosed switches, in particular to a novel three-station switch shell of gas-insulated metal-enclosed switchgear.

Background

In high-voltage power transmission and transformation systems, GIS equipment of a transformer substation is widely adopted, and as the national net can generate greenhouse effect on SF6 gas in recent years, the final decision is to use little sulfur hexafluoride gas or even no sulfur hexafluoride gas, so that mixed gas (a mixture of 70% nitrogen and 30% sulfur hexafluoride gas) is pushed out, and the heat dissipation performance of the mixed gas is far lower than that of 100% sulfur hexafluoride gas. As one of the most important elements in the GIS device, in a high voltage power transmission and transformation system, a transformer substation GIS device has been widely used as a three-station housing for one of the most important elements in the GIS device.

In recent years, the country has high investment in the construction of ultra-high voltage and ultra-high voltage power grids, the voltage level of power transmission and distribution equipment is also higher and higher, and three stations are used as one of the most important elements in the power transmission and distribution links.

However, the test on the safety and stability performance of the three stations in the operation of the existing power grid is more and more strict, and the three stations can work safely and stably, wherein the temperature rise is indispensable as an important checking parameter. The temperature rise is the heat dissipation accomplished by the process in which the temperature generated by the through-flow of the inner conductor radiates through the insulating medium to the housing and then is transmitted through the housing to the atmosphere. Under the unchangeable condition of internal conductor, insulating medium heat dispersion weakens, and the temperature rise just becomes high, has satisfied the standard, just can effectually distribute away inside heat only to increase the radiating area of shell, so need solve the heat dispersion and the explosion-proof problem of three station switch casings among the prior art.

Accordingly, one skilled in the art provides a novel three-position switch housing for a gas insulated metal-enclosed switchgear with a square finned housing to solve the problems set forth in the background art.

Disclosure of Invention

In order to solve the technical problems, the utility model provides:

a novel three-position switch housing for a gas insulated metal-enclosed switchgear, comprising: the side wall is square, four corners of the side wall are elliptical, and the side wall has the effects of increased area, good heat dissipation and small external dimension; the three-station switch shell consists of a first flange, a second flange, a grounding seat and a radiating fin.

Preferably: and a flange I is arranged on two sides of the side wall in a penetrating and sealing manner.

Preferably: and the upper end and the lower end of the side wall are respectively provided with a flange II in a sealing manner.

Preferably: and radiating fins are integrally arranged on the outer walls of the front side and the rear side of the side wall.

Preferably: the side wall and the radiating fin are formed, and the radiating fin is used for increasing radiating surface area and increasing internal bursting pressure born by the side wall.

Preferably: the whole fixed mounting of lateral wall outer wall is equipped with the ground connection seat.

The utility model has the technical effects and advantages that:

the three-position switch adopting the shell is consistent with the original size in the assembly interval, thereby meeting the requirements of the transformation of the national grid mixed gas and the newly-built mixed gas combined electrical appliance. The mixed gas requirements are met, the land for the transformer substation is saved, the replacement and transformation of the original sulfur hexafluoride medium combined electrical appliance can be met under the condition that the size and the interval width of the underframe are not increased, the power failure time is shortened, and the loss caused by the power failure is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a three-position switch housing of a novel gas-insulated metal-enclosed switchgear provided in an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a heat sink in a three-position switch housing of a novel gas-insulated metal-enclosed switchgear according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a side wall in a three-position switch housing of a novel gas-insulated metal-enclosed switchgear according to an embodiment of the present utility model;

in the figure:

1. a sidewall; 2. a first flange; 3. a second flange; 4. a grounding seat; 5. a heat sink.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the detailed description. The embodiments of the utility model have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the utility model in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, and to enable others of ordinary skill in the art to understand the utility model for various embodiments with various modifications as are suited to the particular use contemplated.

Example 1

Referring to fig. 1 to 3, in this embodiment, a three-position switch housing of a novel gas-insulated metal-enclosed switchgear is provided, including: the side wall 1 is a square shell, four corners of the side wall 1 are oval, the side wall 1 has the effects of increased area, good heat dissipation and small external dimension, the three-station switch shell consists of a flange I2, a flange II 3, a grounding seat 4 and a heat radiating fin 5, the flange I2 is arranged on two sides of the side wall 1 in a penetrating and sealing manner, the flange II 3 is arranged on the upper end and the lower end of the side wall 1 in a sealing manner, the heat radiating fin 5 is arranged on the outer walls of the front side and the rear side of the side wall 1 in an integral manner, the side wall 1 and the heat radiating fin 5 are formed, the heat radiating fin 5 has the effects of increasing the heat radiating surface area and increasing the internal blasting pressure born by the side wall 1, and the grounding seat 4 is fixedly arranged on the outer wall of the side wall 1 in an integral manner;

a novel three-station shell structure for gas-insulated metal-enclosed switchgear comprises a flange I2, a flange II 3, a side wall 1, a grounding seat 4 and a radiating fin 5;

the side wall 1 utilizes a square shell structure, the radiating surface area is far larger than that of a round shell under the condition of equal length and width, the radiating area can be increased, meanwhile, the radiating fins 5 are additionally arranged on the outer surface of the shell, the radiating fins 5 have double functions, the capacity of bearing internal explosion pressure after the shell is changed into square is smaller than that of the round shell, at the moment, the radiating fins 5 can play a role in reinforcing the shell, the situation of insufficient radiating area is made up, and meanwhile, the radiating effect is realized due to the fact that the surface area is increased;

the heat dissipation performance of the shell is far greater than that of a round shell under the condition that the side wall 1 has the same length, width and height;

the three stations of the shell can meet the requirement of the national net on temperature rise under the condition that the mixed gas (30 percent SF6+70 percent N2) is filled in the shell;

the shell of the side wall 1 meets the future requirements of national networks on environment-friendly GIS combined electrical appliances with carbon reaching peak and carbon neutralization.

The side wall 1 adopts a square casting shell, so that the heat dissipation area is increased compared with a cylindrical shell;

since the outer surface has many convex parts, the strength is increased, the surface area is increased, and the surface area of the radiating root has a direct relation, and the Newton cooling formula is as follows:

q=h (Tw-Tf) when the fluid is heated;

q=h (Tf-Tw) when the fluid is cooled;

wherein Tw and Tf are the wall temperature and the fluid temperature respectively, if the temperature difference (also called temperature pressure) is recorded as DeltaT and is agreed to be always positive, the Newton cooling formula can be expressed as q=hDeltaT; Φ=haΔt wherein q is heat flux density in watts per square meter (W/square meter), Φ is heat flux in watts (W).

The determining factors are as follows:

the magnitude of the surface heat transfer coefficient is related to many factors in the convective heat transfer process. It is not only dependent on the physical properties of the fluid but also on the shape and size of the heat exchange surface.

The larger the surface area is obtained by the formula, the better the heat dissipation is, so that the heat generated by the three stations during the current-flowing work can be taken away by the outer surface in time, and the heat dissipation can be good.

The shell can completely meet the temperature rise requirement of national standard under the condition of mixed gas, and has two advantages:

firstly, the transformer substation of the newly-built mixed gas combined electrical apparatus occupies small area, and can save national land resources;

secondly, the original sulfur hexafluoride transformer substation is modified, the size requirement can be met without increasing the size of the underframe, so that the power outage time is greatly shortened, the modification efficiency is improved, the cost of manpower and material resources is reduced, the loss caused by power outage to users is saved, and particularly, the power outage time of a factory is shortened, and huge economic benefits are brought.

It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present utility model without the inventive step, are intended to be within the scope of the present utility model. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.

Claims

1. A novel three-position switch housing for a gas insulated metal-enclosed switchgear, comprising:

the side wall (1), the shape of the side wall (1) is a square shell, four corners are elliptical, and the side wall has the effects of increased area, good heat dissipation and small external dimension;

the three-station switch shell consists of a first flange (2), a second flange (3), a grounding seat (4) and a radiating fin (5).

2. The three-position switch housing of a novel gas-insulated metal-enclosed switchgear as claimed in claim 1, wherein the two sides of the side wall (1) are provided with a flange one (2) in a through sealing manner.

3. The three-position switch shell of the novel gas-insulated metal-enclosed switchgear according to claim 1, wherein the upper end and the lower end of the side wall (1) are respectively provided with a flange two (3) in a sealing manner.

4. The three-position switch housing of the novel gas-insulated metal-enclosed switchgear according to claim 1, wherein the heat radiating fins (5) are integrally installed on the outer walls of the front side and the rear side of the side wall (1).

5. A novel three-position switch housing for a gas insulated metal enclosed switchgear as claimed in claim 1, wherein the side wall (1) and heat sink (5) are formed, the heat sink (5) acting to increase the heat dissipation surface area and increase the internal burst pressure of the side wall (1).

6. The three-position switch housing of the novel gas-insulated metal-enclosed switchgear according to claim 1, wherein the grounding seat (4) is fixedly arranged on the whole outer wall of the side wall (1).