A high current switchgear armoured structure

Abstract

A high-current switchgear armored structure includes several busbar terminals arranged vertically and flush on the inner side of the busbar area. Each busbar terminal is covered with an insulating and thermally conductive coating using injection molding. Several passive heat dissipation pipes have their other ends connected in parallel to vertically downward-facing liquid-cooled heat-conducting pipes. These liquid-cooled heat-conducting pipes are vertically inserted and connected through each insulating and thermally conductive coating. The insulating and thermally conductive coatings are in contact with the busbar terminals for heat conduction. This design allows for safe heat conduction between the busbars and busbar terminals, which were originally only able to be cooled by airflow. The insulating and thermally conductive coatings also enable the liquid-cooled heat-conducting pipes to conduct temperature to the busbar joints, and further assist in the efficient heat dissipation of the main heat sources within the busbar area, namely the busbars and busbar joints. This design not only improves heat dissipation efficiency but also achieves internal heat dissipation, preventing condensation and ensuring the safety and stable operation of the entire cabinet.

Description

Technical Field

[0001] This utility model relates to an armor structure for a high-current switching device. Background Technology

[0002] In the field of high-voltage switchgear, 10kV armored withdrawable metal-enclosed switchgear is widely used in power systems, especially in scenarios with high current and high frequency operation, such as new energy power plants and steel metallurgy.

[0003] However, when traditional switchgear operates under high current, the unreasonable design of the heat dissipation structure leads to excessive internal temperature rise, especially in the contact and busbar areas, where hot spots are easily formed. This not only affects the normal operation of the equipment but also accelerates the aging of insulation materials and reduces the service life of the equipment. Traditional equipment usually adopts a single air cooling or natural convection heat dissipation method, which has limited heat dissipation efficiency and cannot effectively cope with the high heat load under high current conditions. For example, under the condition of continuous operation at 3150A for 4 hours, the contact temperature rise of traditional equipment often approaches or exceeds the national standard limit, resulting in unstable operation of the equipment and even causing failure.

[0004] Therefore, it is necessary to solve the problem of high temperature caused by the operation of switching equipment under high current conditions. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a high-current switching equipment armor structure. By setting multiple different heat dissipation parts on the switch box, better heat dissipation effect is achieved during high-current operation. This purpose of this utility model is achieved as follows:

[0006] A high-current switchgear armored structure includes several busbar terminals arranged vertically and flush on the inner side of the busbar area. Each busbar terminal has an outer side coated with an insulating and thermally conductive rubber layer via injection molding. The structure includes a switch box located at the top of the busbar area. A forced cooling section is installed at the top of the busbar area, and several heat sinks are mounted on the forced cooling section. The heat sinks are equidistantly distributed vertically on the forced cooling section, and each heat sink has several drainage holes. The drainage holes on adjacent heat sinks are staggered. Several passive cooling pipes are mounted on the forced cooling section, equidistantly distributed horizontally on the forced cooling section. One end of each passive cooling pipe has a heat sink penetrating it, and the other ends of the passive cooling pipes are connected in parallel and vertically downwards to a liquid cooling conductor. The heat pipes, specifically the vertically plugged liquid-cooled heat pipes, are connected to each insulating thermally conductive coating. These coatings are then connected to the busbar terminals via heat conduction. This allows for safe heat transfer between the busbars and their terminals, which were previously only cooled by airflow. The inner side of the insulating thermally conductive coating also houses plugged liquid-cooled heat pipes, enabling them to conduct heat to the busbar joints. This heat transfer is then facilitated by the heat sinks inside the switch box. This not only cools the switch box itself but also aids in the efficient heat dissipation of the main heat sources within the busbar area, including the busbars and their joints. This design not only improves heat dissipation efficiency but also prevents condensation, ensuring the safety and stable operation of the entire cabinet.

[0007] The outer side of the busbar terminal is provided with a busbar. The heat contact conduction type busbar terminal is connected to the busbar. By connecting the busbar terminal to the busbar, not only is there a conductive connection, but heat is also transferred between the busbar and the busbar terminal, realizing temperature conduction, thereby facilitating direct and efficient heat dissipation inside the busbar.

[0008] A fan is installed on the upper part of the heat sink; a natural heat dissipation section is installed at the rear of the switch box, and several honeycomb heat dissipation sections are installed on the natural heat dissipation section, which are equidistantly rectangularly distributed on the natural heat dissipation section; a gradient heat dissipation section is installed on the side of the switch box, and several corrugated aluminum fins are installed on the gradient heat dissipation section, with the spacing between the corrugated aluminum fins gradually decreasing from bottom to top. By setting up a forced heat dissipation section, a natural heat dissipation section, and a gradient heat dissipation section, a multi-layer heat dissipation structure is formed, which significantly improves the overall heat dissipation efficiency of the equipment; the forced heat dissipation section quickly dissipates heat from the front contact area through the combination of the fan and the heat sink; the natural heat dissipation section enhances the natural convection effect through the honeycomb structure; and the gradient heat dissipation section optimizes the heat flow distribution through the corrugated aluminum fins to avoid local overheating. The three work together to effectively solve the problem of excessive temperature rise in traditional equipment when operating at high current.

[0009] Furthermore, the heat sink is provided with four fins, which are made of aluminum silicon carbide and have a nickel plating on their surface. The roughness of the nickel plating layer is Ra≤0.8μm. This design allows the aluminum silicon carbide material to have high thermal conductivity and mechanical strength, effectively conducting and dispersing heat. The nickel plating treatment enhances the corrosion resistance and thermal radiation efficiency of the heat sink, and the roughness Ra≤0.8μm further optimizes the thermal conductivity.

[0010] Furthermore, the diameter of the drainage holes is 5mm, and the drainage holes on adjacent heat sinks are staggered at an angle of 45 degrees. This design enhances the airflow disturbance effect and improves the heat dissipation efficiency of the heat sinks; the staggered distribution of drainage holes avoids the straight flow of airflow, ensuring uniform heat dissipation.

[0011] Furthermore, the passive heat dissipation pipe is made of copper, with an inner diameter of 10mm and an outer diameter of 12mm. The passive heat dissipation pipe is integrally connected to the liquid cooling heat pipe, and the liquid cooling heat pipe has a heat pipe liquid inside. With this design, the copper pipe has excellent heat conduction performance and can quickly dissipate the heat from the heat sink.

[0012] Furthermore, the maximum wind speed of the fan is 3m / s, and the fan is fixed by a bracket. This design can provide sufficient forced convection effect and quickly remove heat.

[0013] Furthermore, the honeycomb heat dissipation section is arranged in a 5×4 pattern and is made of aluminum alloy. The honeycomb unit is a regular hexagon with a side length of 10mm and a thickness of 20mm. This design increases the heat dissipation area and enhances the natural convection effect. The aluminum alloy material is lightweight and has high thermal conductivity, which further optimizes the heat flow distribution.

[0014] Furthermore, the corrugated aluminum fins have a corrugation angle of 30 degrees, which can effectively guide the heat flow upward and prevent heat from accumulating inside the equipment; the corrugated structure increases the heat dissipation area and further improves the heat dissipation efficiency.

[0015] Compared with existing technologies.

[0016] The busbars and busbar terminals, which were originally only cooled by airflow, now achieve safe heat conduction through insulating and thermally conductive coating. The inner side of the insulating and thermally conductive coating also has plug-in liquid-cooled heat pipes. The insulating and thermally conductive coating allows the liquid-cooled heat pipes to conduct temperature in contact with the busbar joints, thereby transferring the temperature through the heat sinks inside the switch box. This not only achieves internal cooling of the switch box but also assists in the efficient heat dissipation of the main heat sources within the busbar area, namely the busbars and busbar joints. This design not only improves heat dissipation efficiency but also achieves internal heat dissipation without condensation, ensuring the safety and stable operation of the entire cabinet.

[0017] The beneficial effects of this utility model are as follows: by setting up a forced heat dissipation section, a natural heat dissipation section, and a gradual heat dissipation section, a multi-layer heat dissipation structure is formed, which significantly improves the overall heat dissipation efficiency of the equipment; the forced heat dissipation section quickly dissipates heat from the front contact area through the combination of a fan and heat sink; the natural heat dissipation section enhances the natural convection effect through a honeycomb structure; and the gradual heat dissipation section optimizes the heat flow distribution through corrugated aluminum fins to avoid local overheating. The three components work together to effectively solve the problem of excessive temperature rise in traditional equipment when operating at high current. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the side structure of a switch box with an armored structure for high-current switching equipment.

[0019] Figure 2 This is a simplified view of the upper part of the busbar area of ​​a high-current switchgear armored structure.

[0020] Figure 3 This is a simplified rear view diagram of a switch box with an armored structure for high-current switching equipment.

[0021] Figure 4 This is a simplified side view of a switch box with an armored structure for high-current switching equipment.

[0022] Figure 5 This is a partially enlarged side view of the switch box and busbar area, which are armored structures of a high-current switching device.

[0023] In the diagram: 1. Circuit breaker compartment, 2. Passive heat dissipation pipe, 3. Forced heat dissipation section, 4. Bracket, 5. Fan, 6. Drainage hole, 7. Heat sink, 8. Honeycomb heat dissipation section, 9. Gradient heat dissipation section, 10. Corrugated aluminum fins, 11. Natural heat dissipation section, 12. Busbar area, 13. Switch box, 14. Liquid-cooled heat pipe, 15. Insulating thermally conductive coating. Detailed Implementation

[0024] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0025] Please refer to Figure 1-4 This utility model provides an armored structure for a high-current switchgear. Several busbar ends are vertically aligned and flush on the inner side of the busbar area. Each busbar end has an insulating and thermally conductive rubber coating on its outer side, achieved through injection molding. The structure includes a switch box 13, which comprises a busbar area 12. The switch box 13 is located above the busbar area 12. A forced heat dissipation section 3 is installed on the upper part of the busbar area 12. Several heat sinks 7 are installed on the forced heat dissipation section 3, equidistantly distributed vertically. Each heat sink 7 has several drainage holes 6, with the drainage holes 6 on adjacent heat dissipation sections staggered. Several passive heat dissipation pipes 2 are installed on the forced heat dissipation section 3, equidistantly distributed horizontally on the forced heat dissipation section 3. A heat sink 7 is provided through one end of the switch box 13. Several passive heat dissipation pipes 2 are connected in parallel to the other end of a vertically downward liquid-cooled heat conduction pipe 14. The liquid-cooled heat conduction pipe 14 is vertically inserted and connected through each insulating thermally conductive coating 15. The insulating thermally conductive coating 15 is in contact with the thermally conductive end of the busbar. The passive heat dissipation pipe 2 passes through a heat sink 7. A fan 5 is installed on the upper part of the heat sink 7. A natural heat dissipation section 11 is installed at the rear of the switch box 13. Several honeycomb heat dissipation sections 8 are installed on the natural heat dissipation section 11. The honeycomb heat dissipation sections 8 are equidistantly rectangularly distributed on the natural heat dissipation section 11. A gradient heat dissipation section 9 is installed on the side of the switch box 13. Several corrugated aluminum fins 10 are installed on the gradient heat dissipation section 9. The spacing between the corrugated aluminum fins 10 gradually decreases from bottom to top.

[0026] In one embodiment, there are four heat sinks 7. The heat sinks 7 are made of aluminum silicon carbide and are nickel-plated on their surfaces. The roughness of the nickel plating layer is Ra≤0.8μm. The diameter of the drainage holes 6 is 5mm, and the drainage holes 6 on adjacent heat sinks 7 are staggered at an angle of 45 degrees. The passive heat dissipation pipe 2 is made of copper pipe with an inner diameter of 10mm and an outer diameter of 12mm. The maximum wind speed of the fan 5 is 3m / s, and the fan 5 is fixed by the bracket 4. The honeycomb heat dissipation section 8 is arranged in a 5×4 pattern. The honeycomb heat dissipation section 8 is made of aluminum alloy material, and the honeycomb unit is a regular hexagon with a side length of 10mm and a thickness of 20mm. The corrugation inclination of the corrugated aluminum fin 10 is 30 degrees.

[0027] In one possible implementation scenario, after the photovoltaic power station starts generating electricity, the switchgear operates with a current of 3150A. Temperature sensors monitor the temperature of the contacts and busbar areas in real time and transmit the data to the SCADA system. When the temperature of the contact area reaches 65℃, the fan 5 automatically starts with a wind speed of 3m / s. The forced airflow passes through the drainage holes 6 on the heat sink 7. The drainage holes 6 are staggered to enhance airflow disturbance and quickly dissipate heat from the contact area. At the same time, the passive heat sink 2 on the left side, under the action of airflow, will flow from left to right within the passive heat sink 2 due to the lower air pressure inside the heat sink 7, increasing the heat dissipation effect. Heat is transferred to the rear natural heat dissipation section 11 through the middle transition heat dissipation area. The regular hexagonal honeycomb units of the honeycomb heat sink 8 increase the heat dissipation area and enhance the natural convection effect, ensuring that the temperature rise of the busbar area is lower than the national standard limit. The spacing of the corrugated aluminum fins 10 gradually decreases from bottom to top, increasing the heat dissipation performance of the front and increasing the convection effect. The corrugation inclination is 30 degrees, further optimizing the heat flow distribution and ensuring that the heat is evenly dissipated.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A large current switchgear armored structure, the inner side of the busbar area is vertically flush with a plurality of busbar terminals, characterized in that, Each busbar end is covered with an insulating and thermally conductive rubber coating via injection molding. A switch box is located at the top of the busbar area. A forced heat dissipation unit is installed at the top of the busbar area, with several heat sinks mounted on it. These heat sinks are equidistantly distributed vertically on the forced heat dissipation unit, and each heat sink has several drainage holes. The drainage holes on adjacent heat dissipation units are staggered. Several passive heat dissipation pipes are installed on the forced heat dissipation unit, equidistantly distributed horizontally on it. One end of each passive heat dissipation pipe has a heat sink penetrating it, and the other ends of the passive heat dissipation pipes are connected in parallel to vertically downward-facing liquid-cooled heat-conducting pipes. These liquid-cooled heat-conducting pipes are vertically inserted and connected through each insulating and thermally conductive rubber coating. The insulating and thermally conductive rubber coatings are in contact with the thermal conductivity of the busbar end.

2. The armored structure for a high-current switching device according to claim 1, characterized in that, The outer conductor of the busbar end is provided with a busbar, and the heat contact conduction type busbar end is connected to the heat conduction of the busbar.

3. The armored structure for a high-current switching device according to claim 1, characterized in that, A fan is installed on the upper part of the heat sink; a natural heat dissipation part is installed at the rear of the switch box, and several honeycomb heat dissipation parts are installed on the natural heat dissipation part, which are equidistantly rectangularly distributed on the natural heat dissipation part; a gradient heat dissipation part is installed on the side of the switch box, and several corrugated aluminum fins are installed on the gradient heat dissipation part, with the spacing between the corrugated aluminum fins gradually decreasing from bottom to top.

4. The armored structure for a high-current switching device according to claim 1, characterized in that, The heat sink is provided with four fins, which are made of aluminum silicon carbide and have nickel plating on their surfaces. The roughness of the nickel plating layer is Ra≤0.8μm.

5. The armored structure for a high-current switching device according to claim 1, characterized in that, The diameter of the drainage hole is 5mm, and the drainage holes on adjacent heat sinks are staggered at an angle of 45 degrees.

6. The armored structure of a high-current switching device according to claim 1, characterized in that, The passive heat dissipation pipe is made of copper, with an inner diameter of 10mm and an outer diameter of 12mm. The passive heat dissipation pipe is integrally connected to the liquid cooling heat pipe, and the liquid cooling heat pipe is filled with heat pipe liquid.

7. The armored structure for a high-current switching device according to claim 3, characterized in that, The maximum wind speed of the fan is 3 m / s, and the fan is fixed by a bracket.

8. The armored structure of a high-current switching device according to claim 3, characterized in that, The honeycomb heat dissipation section is arranged in a 5×4 pattern. The honeycomb heat dissipation section is made of aluminum alloy material. The honeycomb unit is a regular hexagon with a side length of 10mm and a thickness of 20mm.

9. The armored structure of a high-current switching device according to claim 3, characterized in that, The corrugated aluminum fin has a corrugation angle of 30 degrees.

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