CN111600226A - Gas-insulated metal-enclosed switch cabinet easy to radiate heat - Google Patents

Abstract

A gas-insulated metal-enclosed switch cabinet easy to radiate heat is provided with a radiating top cover (11) on the cabinet top, and the interior of the switch cabinet is divided into a front cabinet (7), a middle cabinet (23) and a rear cabinet (25); the middle part of the middle cabinet (23) is fixedly supported with a square air chamber (20) by an air chamber bracket (24), and the square air chamber (20) comprises heating elements of a wire outlet sleeve (8), a copper bus (18), a 4# inner cone (17) and a test connector (2# inner cone) (21) which are uniformly and dispersedly arranged in the square air chamber (20); three vertical outgoing line sleeves (8) externally connected with a connecting bus (9) positioned above the square air chamber (20) are arranged in front of a top plate of the square air chamber (20) in an inclined I shape; the circuit breaker (4) and the isolating switch (6) which are positioned on the front cabinet are arranged on the aluminum alloy mounting plate (5) to form a whole, and then are arranged on the front plate of the square air chamber (20). The invention can control the temperature rise of the series gas-insulated metal-enclosed switch cabinets in a reasonable range.

Description

A gas-insulated metal-enclosed switch cabinet that is easy to dissipate heat

technical field

The invention relates to a series of gas-insulated metal-enclosed switch cabinets that are easy to dissipate heat in the electric power industry.

Background technique

The series of gas-insulated metal-enclosed switchgear C-GIS belongs to the power distribution equipment in the medium voltage field. The primary flow part is encapsulated in a closed air chamber, and the relative air pressure inside the air chamber is 0.02-0.05 MPa. The gas is generally pure SF6 gas, compressed air, compressed N2, compressed CO2, CF4, C-C4F8, C3F8, C2F6, CF3I, and mixtures of SF6 and the above gases. The series of gas-insulated metal-enclosed switchgears are suitable for receiving and distributing electric energy in 7.2~40.5kV power transmission and distribution systems, realizing real-time control, protection, measurement, monitoring, communication and other functions of the power system under normal operation and fault conditions. It is suitable for control and protection in places such as electric power, metallurgy, port, construction, chemical industry, electrified railway, etc. It is especially suitable for use in harsh environmental conditions such as underground, plateau, permafrost, coast, and humidity. With the approval of more users for the miniaturization and maintenance-free requirements of the series of gas-insulated metal-enclosed switchgear, this series of products are widely used in various places, which also brings more and more requirements for the rated current level. higher. The current levels of 2000A and 2500A have been widely used in the industry, and some industries and some places require the use of current levels of 1.1×2500A and 1.1×3150A.

Compared with the air-insulated metal-enclosed switchgear, the heating power of the two switchgears is basically the same under the same current level, but the air-insulated metal-enclosed switchgear is much larger than the gas-insulated metal-enclosed switchgear, and the overall heat dissipation area is also larger. Many, its cooling effect is better. The primary circuit part of the air-insulated metal-enclosed switchgear is generally equipped with a busbar room, a circuit breaker room and a cable room. The compartments are generally separated by metal partitions, and the protection level is generally IP2X. For heat exchange, the heat in the higher temperature area can be transferred to the lower temperature area by convection. There are cooling holes in many positions of the air-insulated switchgear, which can realize the convection with the external environment, or use the fan installed. Form to achieve forced convection; fundamentally solve the problem of excessive temperature rise of switchgear.

The primary circuit part of the gas-insulated metal-enclosed switchgear also has a busbar room, a circuit breaker room and a cable room. Due to different design ideas, it is generally divided into a double-air chamber structure and a single-air chamber structure. The double air chamber structure is to seal the busbar part and the three-position isolation/earthing switch in one air chamber, called the busbar chamber, and seal the circuit breaker in another air chamber, called the circuit breaker chamber, and the two air chambers pass through Inlaid solid insulating flanges connect the primary conductive parts. The single air chamber structure is to encapsulate the busbar part with solid insulation encapsulation technology, the three-position isolation/earthing switch and the circuit breaker are sealed in one air chamber, and a special insulating cone is designed to make the insulated busbar and the primary conductive in the sealed air chamber. Partial connection. Whether it is a double air chamber structure or a single air chamber structure, in order to prevent the leakage of insulating gas, the primary conductive part and insulating gas are completely enclosed in a sealed air chamber, and the protection level of the air chamber is generally IP65~IP67. It is difficult to take away the heat of the heat-generating components by means of gas convection between the gas chambers and to the outside of the gas chambers. At the same time, in order to reduce the heat generated by the ferromagnetic eddy current loss and meet the requirements of corrosion resistance and high strength, the air chamber is welded by stainless steel plates. The thermal conductivity of the plate is very low, and less heat is conducted through the stainless steel plate. Therefore, as users demand more and more gas-insulated switchgear, especially high-current equipment, it is particularly important to solve the problem of temperature rise of high current.

At present, gas-insulated metal-enclosed switchgear, especially high-current equipment, is difficult to meet the temperature rise requirements of national standards and relevant user standards. The problem of temperature rise exceeding the standard is becoming more and more prominent. The temperature rise of the switchgear exceeds the standard, which directly affects the safe and stable operation of the equipment. . In some areas with heavy loads, the internal overheating of switchgear has become a common problem in the use of switchgear. Practice has proved that the problem of temperature rise seriously affects the stability and service life of switchgear operation. Moreover, the problem of overheating is an evolving process. If it is not controlled, the degree of overheating will continue to increase, and it will have a great impact on the performance of the insulating parts and the life of the equipment. First, it will reduce the insulation of the insulating parts. Secondly, due to the large temperature change, the components in the cabinet will expand to different degrees. The asynchronous expansion will lead to cracking and deformation of components or cause air leakage in the air chamber. cause more serious consequences. In actual operation, due to improper measures of forced air cooling, unreasonable air duct design, unreasonable design of heat dissipation methods, etc., the phenomenon that the temperature rise of the switchgear exceeds the standard still exists.

For the series of gas-insulated metal-enclosed switchgear, hereinafter referred to as the switchgear, when the rated current level of the switchgear is 2500A and below, the relevant standards and user requirements shall adopt natural cooling, hereinafter referred to as self-cooling, to solve the temperature rise problem.

When the rated current level of the equipment reaches 3150A, forced air cooling with an exhaust fan is adopted hereinafter referred to as self-cooling + air-cooling measures to meet the temperature rise requirements of national standards and relevant user standards.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a gas-insulated metal-enclosed switchgear that is easy to dissipate heat, which can control the temperature rise of a series of gas-insulated metal-enclosed switchgear within a reasonable range, and solve the problem of current gas-insulated metal-enclosed switchgear. The temperature rise cannot meet the problem that the rated current of the national standard product and the relevant user standards require 1.1× the rated current of the product.

To solve the above-mentioned technical problems, the technical scheme adopted in the present invention is as follows:

A gas-insulated metal-enclosed switch cabinet that is easy to dissipate heat, characterized in that: the top of the switch cabinet is provided with a heat dissipation top cover 11, and the interior of the switch cabinet is divided into a front cabinet 7, a middle cabinet 23 and a rear cabinet 25;

A square air chamber 20 is fixedly supported by the air chamber bracket 24 in the middle of the middle cabinet 23. The square air chamber 20 includes the heating elements of the outlet bushing 8, the copper busbar 18, the 4# inner cone 17 and the test joint 2# inner cone 21. The heating elements are evenly distributed. arranged in the square air chamber 20;

The three vertical outlet bushings 8 externally connected to the connection bus 9 above the square air chamber 20 are arranged in an oblique "one" shape at the front of the top plate of the square air chamber 20. One front corner of the top plate and the other two extend diagonally to opposite sides;

The circuit breaker 4 and the isolating switch 6 located in the front cabinet are installed on the aluminum alloy mounting plate 5 to form a whole, and then installed on the opening of the front plate of the square air chamber 20 so that the heat in the square air chamber is directly transferred to the aluminum alloy mounting plate. superior.

Preferably, the front cabinet 7 and the middle cabinet 23 are separated by a lower first installation partition 2 and an upper partition 10, the first installation partition 2 is located at the lower part between the front and middle cabinets, and the partition 10 is located in The upper part between the front and middle cabinets, the upper part between the middle cabinet 23 and the rear cabinet 25 is separated by the second installation partition 15, and the lower part of the middle cabinet 23 and the rear cabinet 25 are connected with each other without a partition.

On the basis of the above, the present invention can also have the following preferred solutions for various current levels:

1. For switchgear with current level of 1.1×3150A1.1×2500A≯current≤1.1×3150A:

The insulating tubular busbar 13 at the top of the switch cabinet is used for vertical entry, that is, the busbar outside the square gas chamber is encapsulated by solid insulation, and the first current transformer 12 is installed above the square gas chamber 20 of the middle cabinet 23. The three 4# inner cones (17) of the external insulated tubular busbar 13 of the device 12 are arranged in the rear of the top plate of the square air chamber 20 in a "pin" shape;

A first heat-dissipating air chamber 19 made of aluminum alloy is arranged outside the rear plate of the square air chamber 20 and communicated with the square air chamber 20. The inner and outer surfaces of the first heat-dissipating air chamber 19 are provided with cooling fins and are sprayed with black heat-dissipating paint;

The first fan 3 is installed on the lower first installation partition 2 between the front cabinet 7 and the middle cabinet 23 of the switch cabinet; the second fan 16 is installed on the second installation partition 13 on the upper part of the middle cabinet 23 and the rear cabinet 25, Corresponding ventilation holes 28 are opened in the lower part of the front door 1 of the front cabinet 7 , the lower part of the rear sealing plate 27 of the rear cabinet 25 and the top of the cabinet.

The first blower 3 and the second blower 16 are two parallel machines or more.

The bottom plate of the square air chamber 20 is provided with a pressure release device 22 in the prior art.

The cooling air chamber is the prior art, that is, a number of heat sinks. The cooling air chamber 30 communicates with the square air chamber 20 by opening a hole on the wall of the square air chamber and sealing it directly with the wall of the cooling air chamber. so that the heat in the square air chamber is directly transferred to the cooling air chamber.

2. For switchgear with current level of 1.1×2500A1.1×1250A≯current≤1.1×2500A:

The cable 32 at the bottom of the switch cabinet is used to enter/exit vertically, the second current transformer 29 is installed under the square air chamber 20 of the middle cabinet 23, and the external cables 32 (three single-phase, three-phase A total of 9) are arranged side by side at the bottom of the square air chamber 20, and the 3# inner cones 31 in the square air chamber 20 (3 single-phase, 9 three-phase) are evenly distributed on the bottom plate of the square air chamber 20;

A first heat dissipation air chamber 19 and a second heat dissipation air chamber 30 made of aluminum alloy are respectively provided on the outside of the rear plate of the square air chamber 20 and at the rear of the top plate and communicated with the square air chamber 20. The first and second heat dissipation air chambers The inner and outer surfaces are provided with cooling fins and sprayed with black cooling paint.

The side surface of the second cooling air chamber 30 is provided with a pressure releasing device 22 .

3. For switchgear with current level of 1.1×1250A current ≤1.1×1250A:

The cable 32 at the bottom of the switch cabinet is used to enter/exit vertically. The second current transformer 29 is installed under the square air chamber 20 of the middle cabinet 23, and the external cable connector 33 is connected to the front of the square air chamber 20 through the second current transformer 29. below, and evenly distributed;

A heat dissipation cover plate 34 made of aluminum alloy material close to the rear plate of the square air chamber 20 is installed on the outside of the rear plate of the square air chamber 20; the inner surface and the outer surface of the heat dissipation cover plate 34 are provided with heat dissipation fins and sprayed with black heat dissipation paint .

A pressure release device 22 is provided at the rear of the bottom plate of the square air chamber 20 .

The present invention has the following advantages:

1. Different forms of heat dissipation schemes are set up according to different current levels and different requirements, which effectively solves the problem of temperature rise of switch cabinets, and cleverly combines heat conduction, convection and radiation organically, while increasing the heat dissipation area of the chamber and increasing radiation heat dissipation. , Make reasonable use of the heat conduction properties of materials, strengthen heat conduction, reasonably arrange components and connect copper busbars, and reduce local areas with excessive heating temperature.

2. Use the "double fan forced circulation heat dissipation design scheme" to speed up the flow rate of the gas outside the gas chamber, and use the gas convection to quickly transfer and diffuse the heat, so as to effectively reduce the overall temperature of the gas chamber.

3. Using the principle of "self-cooling double chimney heat dissipation design scheme" and "chimney effect", a "double chimney" is formed inside the switch cabinet, forming a local gas circulation in the switch cabinet, speeding up the flow rate of the gas inside the switch cabinet, The heat is rapidly transferred and diffused by gas convection, so as to effectively reduce the overall temperature of the gas chamber.

4. According to the size of the current, organically combine each cooling air chamber or cooling box/board to form serialization, standardization and modularization; effectively reduce processing, manufacturing and assembly costs.

5. The space of the switch cabinet is effectively used, and the overall size of the switch cabinet is not increased on the basis of completing the design function, so as to effectively reduce the overall temperature of the gas chamber.

6. Without affecting the protection level, use the shell of the switchgear to open holes on the front door, rear door or rear cover as the air inlet, and the opening on the top cover as the air outlet, which is mutually connected with the cooling air chamber or the cooling plate. Cooperate to form a reasonable ventilation channel outside the air chamber to effectively reduce the overall temperature of the air chamber.

Description of drawings

1A is the 1.1×3150A design structure scheme of the first embodiment (the main view of the self-cooling double fan heat dissipation design;

FIG. 1B is a schematic left view of Embodiment 1;

1C is a schematic top view of the square air chamber of the first embodiment;

2 is a schematic diagram of the flow of heat outside the air chamber in Embodiment 1;

3 is a schematic diagram of the flow of heat inside and outside the air chamber of the air chamber according to the first embodiment;

4A is the 1.1×2500A design structure scheme of the second embodiment (the main view of the self-cooling double chimney heat dissipation design;

4B is a schematic left view of Embodiment 2;

4C is a schematic top view of the square air chamber of the second embodiment;

5 is a schematic diagram of the flow of heat outside the air chamber in the second embodiment;

6 is a schematic diagram of the flow of heat inside and outside the gas chamber in Embodiment 2;

7A is the 1.1×1250A design structure scheme of the third embodiment (the schematic diagram of the front view of the self-cooling double chimney heat dissipation design;

7B is a schematic left view of Embodiment 3;

7C is a schematic top view of the square air chamber of Embodiment 3;

8 is a schematic diagram of the flow of heat outside the air chamber in Embodiment 3;

9 is a schematic diagram of the air chamber and the flow of heat inside and outside the air chamber according to the third embodiment.

Reference numerals in the figures refer to:

Front door 1, first installation partition 2, first fan 3, circuit breaker 4, aluminum alloy mounting plate 5, isolation switch 6, front cabinet 7, outlet bushing 8, connecting bus 9, upper partition 10, heat dissipation top cover 11. The first current transformer 12, the tubular busbar 13, the common top cover 14, the second installation partition 15, the second fan 16, the 4# inner cone (17), the copper busbar 18, the first cooling air chamber 19, Square air chamber 20, test joint 21, pressure release device 22, middle cabinet 23, air chamber support 24, rear cabinet 25, bottom frame 26, rear sealing plate 27, ventilation hole 28, second current transformer 29, second heat sink Air chamber 30 , 3# inner cone 31 , cable 32 , external cable connector 33 , heat dissipation cover plate 34 .

Detailed ways

Referring to the drawings, the basic structure of the present invention is as follows: the top of the switch cabinet is provided with a heat dissipation top cover 11 and a common top cover 14, and the interior of the switch cabinet is divided into a front cabinet 7, a middle cabinet 23 and a rear cabinet 29, which are installed in on the chassis 26. The front cabinet 7 and the middle cabinet 23 are separated by the upper partition 10 installed with the upper part and the first installation partition 2 installed with the lower part, and the upper part between the middle cabinet 23 and the rear cabinet 25 is separated by the second installation partition 15, The lower part of the middle cabinet 23 and the rear cabinet 25 are connected with each other without a partition. A square air chamber 20 is fixedly supported by an air chamber bracket 24 in the middle of the middle cabinet 23 . The heating elements including the outlet bushing 8 , the copper bus bar 18 , the 4# inner cone 17 and the test joint 21 are evenly distributed in the square air chamber 20 . The three vertical outlet bushings 8 externally connected to the connection bus 9 above the square air chamber (20) are arranged in an oblique "one" shape at the front of the top plate of the square air chamber 20. Specifically, three are arranged in a straight line and one is located in the square air chamber. One front corner of the top plate of the chamber 20 and the other two extend obliquely to opposite sides. The circuit breaker 4 and the isolating switch 6 located in the front cabinet are mounted on the aluminum alloy mounting plate 5 to form a whole, and then mounted on the opening of the front plate of the square air chamber 20 .

On the basis of the above, the present invention can also have the following preferred solutions for various current levels:

1. For switchgear with current level of 1.1×3150A current ≤1.1×3150A

Referring to FIGS. 1A to 3 , it is the first embodiment of the present invention, which adopts the vertical inlet method of the tubular busbar 13 insulated on the top of the switch cabinet, that is, the busbar outside the cabinet (including the outside of the square air chamber 20 ) is encapsulated by solid insulation, The first current transformer 12 is installed above the square air chamber 20 of the middle cabinet 23 . The 4# inner cone (17) of the externally insulated tubular bus bar 13 through the first current transformer 12 is arranged in the shape of a "pin" at the rear of the top plate of the square air chamber 20, specifically an inner cone socket corresponding to the middle of the rear side of the top plate, The other two are arranged slightly ahead of each other.

A first heat-dissipating air chamber 19 made of aluminum alloy is arranged outside the rear plate of the square air chamber 20 and communicated with the square air chamber 20. The inner and outer surfaces of the first heat-dissipating air chamber 19 are provided with cooling fins and are sprayed with black Thermal paint.

The first fan 3 is installed on the lower first installation partition 2 between the front cabinet 7 and the middle cabinet 23 of the switch cabinet; the second fan 16 is installed on the second installation partition 15 between the middle cabinet 23 and the rear cabinet 25 . Corresponding ventilation holes 28 are opened at the lower part of the front door 1 of the front cabinet 7 , the lower part of the rear sealing plate 27 of the rear cabinet 25 and the top of the cabinet. The bottom plate of the square air chamber 20 is provided with a pressure relief device 22, which is the prior art. The first fan 3 and the second fan 16 may be parallel double or more.

In this embodiment, in order to achieve the purpose of heat dissipation, on the premise of meeting the insulation requirements, the heating elements are evenly arranged in the square air chamber 20 to avoid heat accumulation caused by dense components and high temperature rise. The copper bus bars 18 are designed to be spaced at a certain distance and evenly distributed to increase the effect of heat dissipation and heat transfer. The outlet bushing 8 connecting the busbar 9 is evenly arranged on the top cover of the square air chamber 20 in an oblique "one" shape. Items are arranged in the shape of "products", and the distance between them is maximized. The tubular busbar 11 is encapsulated by solid insulation encapsulation technology. It extends out of the cabinet and can transfer a large amount of heat out of the cabinet, which not only meets the requirements of temperature rise, but also meets the requirements of insulation and is convenient for users to connect.

A first heat dissipation air chamber 19 is arranged on the upper back of the square air chamber 20 and communicated with the square air chamber 20, that is, a hole is opened in the wall of the square air chamber and directly sealed with the wall of the heat dissipation air chamber, so that the square air chamber is The heat is directly transferred to the cooling air chamber. The first heat dissipation air chamber 19 is welded by aluminum alloy profiles with high thermal conductivity. The inner surface and the outer surface of the first heat dissipation air chamber 19 are provided with heat sinks to increase the area of heat absorption and heat dissipation. The inner and outer surfaces are sprayed with black heat dissipation paint, and the heat will be absorbed to the inner surface of the air chamber through conduction, radiation and convection. Through the heat exchange between the inner and outer surfaces, more heat will be in the form of radiation, conduction and convection passed to the external environment. The aluminum alloy mounting plate 5 of the circuit breaker 4 and the isolating switch 6 is made of aluminum alloy material with high thermal conductivity. Through the heat exchange between the inner and outer surfaces, more heat is transferred to the external environment in the form of radiation, conduction and convection. A first fan 3 is installed at the front lower part of the front cabinet of the switch cabinet, and a second fan 16 is installed at the rear upper part of the switch cabinet. The square air chamber 20 dissipates heat by convection outside. Corresponding ventilation holes 28 are opened at the lower part of the front door 1 of the front cabinet 7, the lower part of the rear sealing plate 27 of the rear cabinet 25 and the heat dissipation top cover 11 of the cabinet top to further separate the cold air outside the switch cabinet and the hot air inside the switch cabinet. The forced heat convection exchange effectively reduces the temperature outside the square air chamber, and at the same time accelerates the exchange of heat from the box to the outside, solving the temperature rise problem of the gas-insulated metal-enclosed switchgear.

When the switchgear is energized and operated, the components in the square air chamber 20 will generate heat. The greater the current, the greater the heat generation, and the temperature of each component will increase. Since the square air chamber 20 is filled with Insulating gas with a certain pressure, in order to prevent the leakage of the insulating gas, the primary conductive part and the insulating gas are completely enclosed in a sealed air chamber, and the square air chamber 20 is difficult to generate heat from the heat-generating components by means of gas convection to the outside. . The heat is mainly absorbed to the inner surface of the air chamber through conduction, radiation and partial convection. Through the heat exchange between the inner and outer surfaces of the air chamber, more heat is transferred to the external environment in the form of radiation, conduction and convection. In the front part of the square air chamber 20, the aluminum alloy heat dissipation mounting plate 5 of the circuit breaker (4) and the isolating switch (6) is installed; in the rear part of the square air chamber, the first heat dissipation air chamber 19 of aluminum alloy is installed), These two places have the highest heat transfer efficiency, and more heat is transferred to the external environment in the form of radiation, conduction and convection. The first fan 3 is installed on the front lower part of the front cabinet (7) of the switch cabinet, and the second fan 16 is installed on the rear upper part of the rear cabinet. Depending on the flow rate of the fans, two fans can be installed side by side, and the entire switch cabinet can be installed When the 4 fans are working, a circulation forced heat dissipation cycle is formed outside the square air chamber 20, which enhances the convection heat dissipation outside the square air chamber 20, and passes through the lower part of the front door 1 of the front cabinet 7 and the lower part of the rear sealing plate 27 of the rear cabinet 25. There are corresponding ventilation holes 28 at the heat dissipation top cover 11 on the top of the cabinet, further forcing the convective heat exchange between the cold air outside the switch cabinet and the hot air inside the switch cabinet, effectively reducing the temperature inside the square air chamber and solving the problem of gas The problem of temperature rise in insulated metal-enclosed switchgear. Meet relevant standards and user requirements.

Referring to FIGS. 4A to 6 , it is the second embodiment of the gas-insulated metal-enclosed switchgear that is easy to dissipate heat according to the present invention, and its corresponding current level is 1.1×2500A, which can also be called a self-cooling double chimney heat dissipation design scheme.

The basic structure of this embodiment is the same as that of the first embodiment, and the special features for the current level of 1.1×2500A are:

Referring to Figure 4A to Figure 4C, when the user requires the switchgear to be the lower cable entry line, when the incoming line current is 2500A and below, the user requires that the switchgear generally have multiple cable entry and exit lines at the bottom.

In this embodiment, the cable 32 at the bottom of the switch cabinet is vertically in/out. The second current transformer 29 is installed under the square air chamber 20 of the middle cabinet 23, and the external cables 32 through the second current transformer 29 are three single-phase. A total of 9 of the three phases are arranged side by side at the bottom of the square air chamber 20 . The 3# inner cone 31 in the square air chamber 20 is a single-phase, 3-phase and a total of 9 evenly distributed on the bottom plate of the square air chamber 20 .

The three vertical outlet bushings 8 externally connected to the connection bus 9 above the square air chamber 20 are arranged in the front of the top plate of the square air chamber 20 in an oblique "one" shape. One of the front corners of the chamber roof and the other two obliquely extend to opposite sides.

A first heat-dissipating air chamber 19 and a second heat-dissipating air chamber 30 made of aluminum alloy are respectively provided on the outside of the rear plate of the square air chamber 20 and at the rear of the top plate and communicate with the square air chamber 20 . The inner and outer surfaces are provided with cooling fins and sprayed with black cooling paint. A pressure release device 22 is provided on the side of the second heat dissipation air chamber 30 .

In order to achieve the purpose of heat dissipation, on the premise of meeting the insulation requirements, the heating elements are evenly arranged in the air chamber to avoid heat accumulation caused by the dense components and high temperature rise; cloth to increase the effect of heat dissipation and heat transfer; the outlet cones 8 connecting the bus bars 9 are evenly arranged in an oblique "one" shape and are evenly arranged on the top cover of the square air chamber 20, and the 3# cable cones 31 are evenly distributed with the square air chamber 20. on the bottom plate, and ensure that the cable 32 can pass through the second current transformer 29 smoothly.

A second heat-dissipating air chamber 30 is arranged on the top of the square air chamber 20, and a first heat-dissipating air chamber 19 is arranged on the rear upper part of the square air chamber to form a double heat-dissipating box. The second heat-dissipating air chambers 19 and 30 are welded by aluminum alloy profiles with high thermal conductivity. There are heat sinks on the inner and outer surfaces of each heat-dissipating air chamber to increase the area of heat absorption and heat dissipation. The surface is sprayed with black heat dissipation paint, and the heat will be absorbed to the inner surface of the air chamber by conduction, radiation and convection. Through the heat exchange between the inner and outer surfaces, more heat will be transferred to the outside in the form of radiation, conduction and convection. surroundings.

The aluminum alloy mounting plate 5 of the circuit breaker 4 and the isolating switch 6 is made of aluminum alloy material with high thermal conductivity. Through the heat exchange between the inner and outer surfaces, more heat is transferred to the external environment in the form of radiation, conduction and convection.

When the switchgear is energized and operated, the components in the square air chamber (20) will heat up. The greater the current, the greater the heat generation, and the temperature of the components will increase. Since the square air chamber 20 is full of Insulating gas with a certain pressure, in order to prevent the leakage of the insulating gas, the primary conductive part and the insulating gas are completely enclosed in a sealed gas chamber, and the square gas chamber 20 is difficult to generate heat from the heat-generating components by means of gas convection to the outside. The heat is mainly absorbed to the inner surface of the air chamber through conduction, radiation and partial convection. Through the heat exchange between the inner and outer surfaces of the air chamber, more heat is transferred to the external environment in the form of radiation, conduction and convection.

On the top of the square air chamber 20, a second gold heat dissipation air chamber 30 is installed, and the second heat dissipation air chamber is the place with the highest heat transfer efficiency, and directly transmits the heat out of the cabinet through the heat dissipation top cover (11). At the front of the square air chamber, the aluminum alloy mounting plate (5) of the circuit breaker (4) and the isolating switch (6) is installed, and at the rear of the square air chamber (20), the first cooling air chamber 19 is installed. The place is where the heat transfer efficiency is relatively high, and more heat is transferred to the outside of the square air in the form of radiation, conduction and convection, and a higher temperature area is formed there, namely: aluminum alloy mounting plate 5. The first The heat dissipation air chamber 19 forms a "thermal pressure difference" in the middle part of the front cabinet 7 and the rear cabinet 25 respectively. The principle of hot air rising is used to realize natural ventilation and strengthen air convection. The top of the switchgear is discharged, which is the double chimney effect. In the design, without affecting the installation of components, try to keep the dual passages of the front cabinet 7 and the rear cabinet 25 unobstructed, and pass the heat dissipation top through the lower part of the front door 1 of the front cabinet 7, the lower part of the rear sealing plate 27 of the rear cabinet 25 and the top of the cabinet. Corresponding ventilation holes 28 are opened at the cover 11, which further conducts convective heat exchange between the cold air outside the switchgear and the hot air inside the switchgear, effectively reducing the temperature inside the square air chamber and solving the temperature of the gas-insulated metal-enclosed switchgear. problems, and meet relevant standards and user requirements.

7A to 9 , it is the third embodiment of the gas-insulated metal-enclosed switchgear with easy heat dissipation of the present invention, and the corresponding current level is 1.1×1250A, or the self-cooling double chimney heat dissipation design scheme.

The difference between this embodiment and the second embodiment is only that the cooling air chamber is not provided outside the rear plate of the square air chamber 20 and the rear part of the top plate, but is only installed outside the rear plate of the square air chamber 20, which is close to the square air chamber 20. The aluminum alloy heat dissipation cover plate 32 on the opening of the rear plate of the air chamber 20 .

As shown in Figure 7: When the user requires the switchgear to enter the lower part of the cable, when the incoming current is 1250A and below, the user requires that the switchgear generally have multiple cable entry and exit lines at the bottom.

As shown in Figures 7A to 9: In order to achieve the purpose of heat dissipation, on the premise of meeting the insulation requirements, the heating elements are evenly arranged in the square air chamber 20, so as to avoid heat accumulation caused by dense components and high temperature rise. ; The outlet sleeve 8 of the copper bus 18 is evenly arranged in an oblique "one" shape with the top cover of the square air chamber 20, and the cable joints 33 are evenly distributed with the front lower part of the square air chamber 20.

An aluminum alloy heat dissipation cover plate 34 with high thermal conductivity is arranged at the rear of the square air chamber 20, and the aluminum alloy mounting plate 5 of the circuit breaker 4 and the isolating switch 6 is made of aluminum alloy material with high thermal conductivity. Heat exchange, more heat is transferred to the external environment in the form of radiation, conduction and convection.

When the switchgear is energized and operated, the components in the air chamber will heat up. The greater the current, the greater the heat generation, and the temperature of the components will increase. Because the square air chamber 20 is filled with insulation with a certain pressure Gas, in order to prevent the leakage of insulating gas, the primary conductive part and insulating gas are completely enclosed in a sealed gas chamber, and it is difficult for the gas chamber to take away the heat of the heating components by means of gas convection; the heat is mainly conducted through conduction and radiation. , Partial convection is absorbed to the inner surface of the air chamber, and through the heat exchange between the inner and outer surfaces of the square air chamber 20, more heat is transferred to the external environment in the form of radiation, conduction and convection.

In the front part of the square air chamber 20, the aluminum alloy mounting plate 5 of the circuit breaker 4 and the isolating switch 6 is installed, and in the rear part of the square air chamber 20, the heat dissipation cover plate 34, these two places are the places with the highest heat transfer efficiency, More heat is transferred to the external environment in the form of radiation, conduction and convection, and a higher temperature area is formed there, namely: the aluminum alloy mounting plate 5 and the heat dissipation cover plate 34, respectively in the front cabinet 7 and the rear cabinet. The middle part of 25 forms a "thermal pressure difference", which uses the principle of hot air rising to realize natural ventilation and strengthen air convection. The hot air is quickly discharged from the top of the switch cabinet along the channel due to the effect of density difference, which is the double chimney effect. In the design, without affecting the installation of components, try to keep the passage as smooth as possible. The ventilation hole 28 further exchanges the convective heat between the cold air outside the switchgear and the hot air inside the switchgear, effectively reducing the temperature inside the square air chamber 20, solving the temperature rise problem of the gas-insulated metal-enclosed switchgear, and satisfying the relevant requirements. Standards and User Requirements.

Claims (9)

1. The utility model provides an easy radiating gas insulation metal-enclosed switch cabinet, characterized by: a heat dissipation top cover (11) is arranged on the top of the switch cabinet, and the interior of the switch cabinet is divided into a front cabinet (7), a middle cabinet (23) and a rear cabinet (25); the middle part of the middle cabinet (23) is fixedly supported with a square air chamber (20) by an air chamber bracket (24), and heating elements comprising a wire outlet sleeve (8), a copper bus (18), a 4# inner cone (17) and a test connector 2# inner cone (21) are uniformly and dispersedly arranged in the square air chamber (20); three vertical outgoing line sleeves (8) externally connected with a connecting bus (9) positioned above the square air chamber (20) are arranged in front of a top plate of the square air chamber (20) in an inclined I shape; the circuit breaker (4) and the isolating switch (6) which are positioned on the front cabinet are arranged on the aluminum alloy mounting plate (5) to form a whole and then are arranged on the opening of the front plate of the square air chamber (20).

2. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 1, wherein: the novel multifunctional cabinet is characterized in that the front cabinet (7) is separated from the middle cabinet (23) by a first lower mounting partition plate (2) and an upper partition plate (10), the first mounting partition plate (2) is positioned at the lower part between the front cabinet and the middle cabinet, the partition plate (10) is positioned at the upper part between the front cabinet and the middle cabinet, the upper part between the middle cabinet (23) and the rear cabinet (25) is separated by a second mounting partition plate (15), and the lower parts of the middle cabinet (23) and the rear cabinet (25) are not provided with partition plates and are communicated with each other.

3. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 1 or 2, wherein: for a switch cabinet with the current level of 1.1 multiplied 3150A (the current is not more than 1.1 multiplied 2500A and not more than 1.1 multiplied 3150A), the vertical wire inlet mode of the insulating tubular bus (13) at the top of the switch cabinet is adopted, namely, the bus outside a square air chamber is encapsulated by solid insulation; the first current transformer (12) is arranged above a square air chamber (20) of the middle cabinet (23), and three 4# inner cones (17) which are externally connected with the insulating tubular bus (13) through the first current transformer (12) are arranged at the rear part of a top plate of the square air chamber (20) in a shape of a Chinese character 'pin'; a first heat dissipation air chamber (19) made of aluminum alloy is arranged outside the rear plate of the square air chamber (20) and is communicated with the square air chamber (20), and heat dissipation fins are arranged on the inner surface and the outer surface of the first heat dissipation air chamber (19) and are sprayed with black heat dissipation paint; a first fan (3) is arranged on a first mounting clapboard (2) at the lower part between a front cabinet (7) and a middle cabinet (23) of the switch cabinet; a second fan (16) is arranged on a second mounting clapboard (13) at the upper parts of the middle cabinet (23) and the rear cabinet (25), and corresponding vent holes (28) are arranged at the lower part of the front door (1) of the front cabinet (7), the lower part of the rear sealing plate (27) of the rear cabinet (25) and the top of the cabinet.

4. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 3, wherein: the first fan (3) and the second fan (16) are arranged in parallel or more than one fan.

5. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 4, wherein: the bottom plate of the square air chamber (20) is provided with a pressure release device (22).

6. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 1 or 2, wherein: for a switch cabinet with the current level of 1.1 × 2500A (1.1 × 1250A no more than the current is less than 1.1 × 2500A), the vertical wire inlet/outlet mode of a cable (32) at the bottom of the switch cabinet is adopted, a second current transformer (29) is installed below a square air chamber (20) of a middle cabinet (23), the cable (32) externally connected through the second current transformer (29) is arranged at the bottom of the square air chamber (20) side by side, and 3# inner cones (31) in the square air chamber (20) are uniformly distributed on a bottom plate of the square air chamber (20) in a dispersing way; a first heat dissipation air chamber (19) and a second heat dissipation air chamber (30) which are made of aluminum alloy materials are respectively arranged outside a rear plate of the square air chamber (20) and on the rear portion of the top plate and communicated with the square air chamber (20), and heat dissipation fins are arranged on the inner surface and the outer surface of the first heat dissipation air chamber and the outer surface of the second heat dissipation air chamber and sprayed with black heat dissipation paint.

7. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 6, wherein: and a pressure release device (22) is arranged on the side surface of the second heat dissipation air chamber (30).

8. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 1 or 2, wherein: for the switch cabinet with the current level of 1.1 multiplied by 1250A, the vertical wire inlet/outlet mode of a cable (32) at the bottom of the switch cabinet is adopted, a second current transformer (29) is arranged below a square air chamber (20) of a middle cabinet (23), and is connected with a cable joint (33) through the second current transformer (29) in parallel to the front lower part of the square air chamber (20) and is uniformly distributed; a heat dissipation cover plate (34) made of aluminum alloy material and tightly attached to the rear plate of the square air chamber (20) is arranged outside the rear plate of the square air chamber (20); the inner surface and the outer surface of the radiating cover plate (34) are provided with radiating fins and are sprayed with black radiating paint.

9. The gas insulated metal enclosed switchgear easy to dissipate heat according to claim 8, wherein: and a pressure release device (22) is arranged at the rear part of the bottom plate of the square air chamber (20).

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