CN117767163B - Atmospheric sealing air insulation ring main unit - Google Patents
Atmospheric sealing air insulation ring main unit Download PDFInfo
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- CN117767163B CN117767163B CN202311498222.6A CN202311498222A CN117767163B CN 117767163 B CN117767163 B CN 117767163B CN 202311498222 A CN202311498222 A CN 202311498222A CN 117767163 B CN117767163 B CN 117767163B
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- 238000007789 sealing Methods 0.000 title claims description 35
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 116
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- 238000009423 ventilation Methods 0.000 claims abstract description 46
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- 239000004945 silicone rubber Substances 0.000 claims description 5
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 5
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Abstract
The invention relates to an air insulation ring main unit technology, which is used for solving the problems that water vapor in air causes damage to electrical equipment due to air exchange, environment pollution is easy to cause when an insulation medium is used, contact fusion welding is caused by low closing speed, and particularly relates to an atmospheric pressure sealed air insulation ring main unit, which comprises a base; according to the invention, water vapor is gradually converted into liquid from vapor state through the labyrinth channel, the waterproof ventilation valve limits the flowing direction of the liquid, water and dust are prevented from entering the sealed stainless steel box body during gas exchange, insulating components are mainly adopted through equipment connection in the ring main unit, insulation effectiveness is ensured, the grounding switch is driven to perform quick closing action through the spring in the isolating switch operating mechanism to be compressed and stored energy during operation, the grounding contact can be effectively prevented from burning loss caused by arc combustion during closing, the connecting line of the moving contact turning point and the main shaft transmission turning arm is an obtuse angle, and the phenomenon of knife withdrawal caused by the action of electric force in closing moment can be effectively avoided.
Description
Technical Field
The invention relates to the technology of an air-insulated ring main unit, in particular to an atmospheric-pressure sealed air-insulated ring main unit.
Background
The air-insulated ring main unit is called corresponding to a compact air-insulated ring main unit, and the early-stage ring main unit of the air-insulated ring main unit adopts a VEI vacuum or air-compression type load switch, an air-production type load switch and the like, and is used in a large quantity along with SM6 later, so that the air-insulated ring main unit becomes the main stream.
In the prior art, the inside of the stainless steel box body exchanges gas with the external environment, water in the air easily enters the inside of the stainless steel box body along with the flowing of the air, so that the humidity of the inside of the stainless steel box body is high, the insulation strength of electrical equipment in the stainless steel box body is reduced, the condition of insulation breakdown damage easily occurs, the performance of the equipment is easily reduced, and the service life is easily prolonged; SF6 gas is mainly used as an insulating medium in the ring main unit, and the SF6 gas can be converted into various harmful and corrosive gases in the efficacy process of corona, fire, spark and arc discharge when the circuit breaker is opened and closed, and the gases are released to cause harm to the atmospheric environment; when the grounding switch completes the closing operation, the arcing time between the contacts is longer due to slower closing speed, the contact fusion welding is easy to cause, the interaction force between the moving contact and the fixed contact is smaller, and the situation of loosening and retracting the knife still easily occurs after the moving contact is closed.
Disclosure of Invention
The invention aims to gradually convert vapor into liquid through a labyrinth channel, a waterproof ventilation valve limits the flowing direction of liquid, water and dust are prevented from entering the sealed stainless steel box during gas exchange, insulating components are mostly adopted for equipment connection in a ring main unit, insulation effectiveness is guaranteed, a spring in an isolating switch operating mechanism is compressed and stored during operation, a rebound spring drives a grounding switch to perform quick closing action during release, burning loss caused by electric arc burning of a grounding contact during closing can be effectively prevented, a moving contact turning point and a main shaft transmission crank arm are connected to form an obtuse angle, the problem that moisture in air damages electrical equipment due to air exchange and the problems of environmental pollution and contact fusion welding due to slower closing speed due to use of an insulating medium can be effectively solved, and the air-sealed ring main unit is provided.
The aim of the invention can be achieved by the following technical scheme:
The utility model provides a normal pressure sealed air insulation looped netowrk cabinet, includes the base, base upper surface one side is provided with the stainless steel box, base upper surface opposite side is provided with the mechanism room body, the mechanism room body upper surface is close to stainless steel box position department is provided with the low pressure room body, the stainless steel box lateral wall is kept away from one side top of mechanism room body installs the observation window, stainless steel box lateral wall intermediate position department is close to the pressure balance device is installed to the observation window below, stainless steel box lateral wall intermediate position department is close to the pressure balance device below is installed the back closing cap, the low pressure room door plant is installed to one side of stainless steel box is kept away from to the low pressure room body lateral wall, the mechanism room door plant is installed to one side of stainless steel box is kept away from to the mechanism room body, the base is kept away from the lower cabinet door is installed to one side of stainless steel box.
As a preferred implementation mode of the invention, an isolating switch body is arranged at the middle position inside the stainless steel box body, a primary charging part of a product is arranged inside the stainless steel box body, the primary charging part of the product comprises a breaker cabinet and a load switch cabinet, three permanent magnet switch bodies are arranged at the middle position of the upper surface inside the stainless steel box body, and side expansion sleeves are respectively arranged at the positions of the front side and the rear side of the inner side wall of the stainless steel box body corresponding to the three permanent magnet switch bodies.
As a preferred implementation mode of the invention, the lower end of the permanent magnet switch body is provided with a waterproof ventilation valve, the lower end of the waterproof ventilation valve is connected with the isolating switch body, a cable sleeve is arranged inside the stainless steel box body and close to the lower part of the isolating switch body, a soft connection is arranged between the cable sleeve and the isolating switch body, and a connecting busbar is arranged on one side, far away from the door plate of the low-pressure chamber, of the inner side wall of the stainless steel box body.
As a preferred implementation mode of the invention, a permanent magnet switch quick-release mechanism is arranged above one side, close to the stainless steel box, of the inner side wall of the mechanism chamber body, and a disconnecting switch operating mechanism is arranged below the permanent magnet switch quick-release mechanism, close to the inner side wall of the mechanism chamber body.
As a preferred implementation mode of the invention, a sealing ring is arranged between the pressure balancing device and the stainless steel box body, a ventilation structure of a labyrinth type channel is adopted in the stainless steel box body, two ventilation holes are formed at the lower end of the channel, a sealing gasket is arranged between the channel and the stainless steel box body, a ventilation hole connected with the stainless steel box body is formed at the upper end of the sealing gasket, and a waterproof ventilation valve is also arranged at the position of the stainless steel box body corresponding to the ventilation hole.
As a preferred implementation mode of the invention, the installation part of the waterproof ventilation valve is provided with a transparent sealing plate, the rear part of the stainless steel box body is of an open pore structure, and the isolating switch body adopts a three-station disconnecting link structure.
As a preferred implementation mode of the invention, the isolation switch body and the cable sleeve are connected by adopting a special silicone rubber vulcanization sealing process, and the circuit breaker, the isolation switch body and the conductive part all adopt single-phase independent air insulation structures.
As a preferred embodiment of the present invention, a spring is provided inside the disconnecting switch operating mechanism, and a grounding switch is also provided inside the mechanism chamber body.
Compared with the prior art, the invention has the beneficial effects that:
Through the labyrinth channel, when the air containing water vapor passes through the labyrinth channel, the energy of the water vapor is gradually reduced, and when the air reaches the tail end of the labyrinth channel, the water vapor is gradually converted from a vapor form into a liquid form, and a certain amount of dust is taken away while the liquid flows out, so that the cleaning effect is achieved, the waterproof ventilation valve can limit the flowing direction of the liquid, the pressure inside the stainless steel box body is always the same as the atmospheric pressure, and meanwhile, the water and the dust are prevented from entering the sealed stainless steel box body during gas exchange;
The device connection inside the ring main unit adopts insulating parts in an air insulating environment, so that a small amount of dust and slight condensation phenomenon exist inside the sealed stainless steel box, the insulating effectiveness can be ensured, the self-healing capacity of certain insulating performance is realized, and the service life of the product is greatly prolonged;
The spring in the isolating switch operating mechanism is compressed for energy storage during operation, and when the spring is released, the rebound spring drives the grounding switch to conduct quick closing action, so that burning loss caused by arc burning of the grounding contact during closing can be effectively prevented, after the grounding switch is closed, the connecting line of the turning point of the moving contact and the main shaft transmission turning arm is an obtuse angle, the force arm of the moving contact relative to the turning point is very small, and the phenomenon of tool withdrawal caused by the action of electric force in the closing moment can be effectively avoided.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a main block diagram of the present invention;
FIG. 2 is a structural view showing the internal structure of the mechanism chamber of the present invention;
FIG. 3 is a structural view of the internal structure of the stainless steel tank of the present invention;
FIG. 4 is a left-hand view of the stainless steel housing of the present invention;
In the figure: 1. an observation window; 2. a pressure balancing device; 3. a rear cover; 4. a low pressure chamber body; 5. a mechanism chamber body; 6. a stainless steel box; 7. a base; 8. a low pressure chamber door panel; 9. a mechanism chamber door panel; 10. a lower cabinet door; 11. a permanent magnet switch body; 12. an isolating switch body; 13. a cable sleeve; 14. a side-expanded sleeve; 15. waterproof ventilation valve; 16. soft connection; 17. connecting a busbar; 18. a permanent magnet switch quick-separating mechanism; 19. and an isolating switch operating mechanism.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
Referring to fig. 1-2 and fig. 4, an atmospheric sealed air insulation ring main unit comprises a base 7, one side of the upper surface of the base 7 is provided with a stainless steel box body 6, the other side of the upper surface of the base 7 is provided with a mechanism chamber body 5, the position, close to the stainless steel box body 6, of the upper surface of the mechanism chamber body 5 is provided with a low-pressure chamber body 4, the upper side, far from the mechanism chamber body 5, of the outer side wall of the stainless steel box body 6 is provided with an observation window 1, the middle position of the outer side wall of the stainless steel box body 6 is provided with a pressure balancing device 2 close to the lower side of the observation window 1, the stainless steel box body 6 is subjected to breathing action to exchange air, the material of the pressure balancing device 2 has low sensitivity to external temperature change, the temperature change along with the external temperature change is slow, the middle position of the outer side wall of the stainless steel box body 6 is provided with a rear sealing cover 3 close to the lower side of the pressure balancing device 2, the outer side wall of the low-pressure chamber body 4 is provided with a low-pressure chamber 8, the side, far from the mechanism chamber body 5 from the stainless steel box body 6 is provided with a door plate 9, and the lower side, far from the stainless steel box body 6 is provided with a door plate 10, and is provided with a door plate 10;
The stainless steel box 6 is internally provided with a primary charging part of a product, namely an SUS304 stainless steel box 6 with the thickness of 3mm, the stainless steel box 6 is welded by adopting a full-automatic laser welding process, so that all welding surfaces of the stainless steel box 6 can meet the airtight structural requirement, the stainless steel box 6 uses special balance bin equipment for vacuumizing and leak detection, the integral and structural requirements of the stainless steel box 6, dynamic sealing and static sealing connected with a mechanism meet the air tightness requirement, the primary charging part of the product comprises a breaker cabinet and a load switch cabinet, three permanent magnet switch bodies 11 are arranged at the middle position of the upper surface inside the stainless steel box 6, the permanent magnet switch bodies 11 are breaker/load switches, and side expansion sleeves 14 are respectively arranged at the front side and the rear side of the inner side wall of the stainless steel box 6 corresponding to the positions of the three permanent magnet switch bodies 11;
When the temperature difference exists between the internal temperature of the stainless steel box body 6 and the external temperature, air enters the sealed stainless steel box body 6 from the outside through a channel, certain water vapor exists in the air, when the air enters the pressure balancing device 2, the air passes through the labyrinth channel, because the internal temperature of the labyrinth channel is inconsistent with the external temperature or the internal temperature of the box body, the flow channel distance in the labyrinth channel is longer, the number of curves is large, the energy of the water vapor in the air is gradually reduced in the process of flowing in the labyrinth channel, when the water vapor reaches the tail end of the labyrinth channel, the water vapor is gradually converted into a liquid form from the vapor form, the liquid slowly flows out of the pressure balancing device 2 from the labyrinth channel under the action of self gravity, and a certain amount of dust is taken out when the liquid flows out; after a small amount of dust and moisture continuously pass through the tail end in the labyrinth passage, under the filtering action of the waterproof ventilation valve 15, a small amount of dust and moisture cannot enter the sealed stainless steel box 6, the filtered dust and moisture again flows back to the labyrinth passage and finally flows out of the pressure balancing device 2, and finally air entering the stainless steel box 6 is filtered, so that the requirement that the internal pressure of the stainless steel box 6 is always the same as the atmospheric pressure, and meanwhile, the moisture and the dust are prevented from entering the sealed stainless steel box 6 during gas exchange is met;
A sealing ring is arranged between the pressure balancing device 2 and the stainless steel box body 6, a sealing structure is formed with the outside, a ventilation structure of a labyrinth type channel is adopted in the stainless steel box body 6, two ventilation holes are formed at the lower end of the channel, a sealing gasket is arranged between the channel and the stainless steel box body 6, the sealing gasket is made of a silicon rubber material, a ventilation hole connected with the stainless steel box body 6 is formed at the upper end of the sealing gasket, a waterproof ventilation valve 15 is also arranged at the position of the stainless steel box body 6 corresponding to the ventilation hole, and air in the stainless steel box body 6 and the outside form a flow channel from the ventilation hole positions at the upper end and the lower end of the pressure balancing device 2 through the labyrinth type channel, the ventilation hole on the stainless steel box body 6 and the waterproof ventilation valve 15, so that the air exchange is carried out between the stainless steel box body 6 and the outside, and the internal air pressure and the atmospheric pressure of the sealed stainless steel box body 6 are always kept the same;
the pressure balancing device 2 and the waterproof ventilation valve 15 can be maintained, cleaned or replaced according to the use requirement of the product, and the rear part of the sealed stainless steel box body 6 can be opened to maintain or overhaul the product, so that visual management of the whole life cycle of the product is realized, and the stability and reliability of the product are improved;
The core material of the waterproof ventilation valve 15 is high molecular material expanded polytetrafluoroethylene, and the material has good barrier effect on dust and moisture while ventilation and ventilation; the material is packaged on a metal or nonmetal valve body, the waterproof ventilation valve 15 is provided with a special thread and sealing ring sealing structure, and the waterproof ventilation valve is arranged on a structure needing ventilation, water resistance, dust resistance and dust resistance, and can play roles in ventilation, water resistance and dust filtration; in addition, when the airtight detection is carried out on the sealed stainless steel box body 6, the waterproof ventilation valve 15 can be replaced by a sealing valve, so that the whole sealed stainless steel box body 6 is changed into a full-sealing structure to carry out the airtight detection, a transparent sealing plate is arranged at the installation part of the waterproof ventilation valve 15, the use state of the waterproof ventilation valve 15 can be observed through the transparent sealing plate, when the waterproof ventilation valve 15 needs to be maintained and replaced, the transparent sealing plate can be opened, the rear part of the stainless steel box body 6 is of an open pore structure, the rear part of the stainless steel box body 6 is installed by adopting a special aluminum plate with the thickness of 10mm, the open pore of the stainless steel box body 6 is sealed, the sealing ring is used for sealing between the aluminum plate and the stainless steel box body 6, the protection grade after sealing at least reaches IP65, and when the product needs to be maintained or overhauled, a fixing screw on the aluminum plate can be unscrewed by using a special tool to open the maintenance or overhaul the sealed stainless steel box body 6;
In the prior art, the inside of the stainless steel box body 6 exchanges gas with the external environment, water in the air easily enters the inside of the stainless steel box body 6 along with the flowing of the air, so that the inside humidity of the stainless steel box body 6 is high, the insulation strength of electrical equipment in the stainless steel box body 6 is reduced, the condition of insulation breakdown damage easily occurs, the performance of the equipment is easily reduced, and the service life is easily prolonged;
The stainless steel box 6 on the 10kV normal pressure sealed air insulation ring main unit is welded by adopting a full-automatic laser welding process, so that all welding surfaces of the stainless steel box 6 can meet the airtight structural requirement, water vapor in the air in the external environment cannot enter the stainless steel box 6 from other places, when the temperature difference exists between the internal temperature of the stainless steel box 6 and the external temperature, the air can enter the sealed stainless steel box 6 from the outside through a channel, certain water vapor exists in the air, when the air enters the pressure balancing device 2, the air can pass through the labyrinth channel because the temperature inside the labyrinth channel is inconsistent with the temperature inside the outside or the box, the flow channel distance inside the labyrinth channel is long, the number of curves is large, the energy of the water vapor in the air is gradually reduced in the process of flowing in the labyrinth channel, when the water vapor reaches the tail end of the labyrinth channel, the water vapor is gradually converted into a liquid form from the vapor form, the liquid slowly flows out of the pressure balancing device 2 from the inside the labyrinth channel by the action of gravity of the liquid, and a certain amount of dust is discharged at the same time; after a small amount of dust and moisture continuously pass through the tail end in the labyrinth passage, under the filtering action of the waterproof ventilation valve 15, a small amount of dust and moisture cannot enter the sealed stainless steel box 6, the filtered dust and moisture again flows back to the labyrinth passage and finally flows out of the pressure balancing device 2, and finally air entering the stainless steel box 6 is filtered, so that the requirement that the internal pressure of the stainless steel box 6 is always the same as the atmospheric pressure, and meanwhile, the moisture and the dust are prevented from entering the sealed stainless steel box 6 during gas exchange is met;
Example 2:
Referring to fig. 3-4, an isolating switch body 12 is arranged in the middle position inside a stainless steel box 6, the isolating switch body 12 adopts a three-station disconnecting link structure, the isolating switch body 12 is connected with a cable sleeve 13 by adopting a special silicone rubber vulcanization sealing process, a waterproof ventilation valve 15 is arranged at the lower end of a permanent magnet switch body 11, the lower end of the waterproof ventilation valve 15 is connected with the isolating switch body 12, the cable sleeve 13 is arranged below the isolating switch body 12 inside the stainless steel box 6, a flexible connection 16 is arranged between the cable sleeve 13 and the isolating switch body 12, a connecting busbar 17 is arranged on one side, far away from a low-voltage chamber door plate 8, above the inner side wall of the stainless steel box 6, of a circuit breaker, the isolating switch body 12 and a conductive part are all in a single-phase independent air insulation structure, and a conductive part of a ring main unit adopts electric field shielding and voltage equalizing treatment, so that the insulating performance is further improved;
The normal-pressure sealed air insulation ring main unit comprises a breaker cabinet and a load switch cabinet, the air clearance of an isolation fracture of the ring main unit is not less than 125mm, the inter-phase insulation fault can be effectively prevented, the creepage distance is not less than 260mm, even if a small amount of dust and slight condensation phenomenon exist in the sealed stainless steel box 6, the insulation effectiveness can be ensured, the self-healing capacity of certain insulation performance is realized, and the service life of a product is greatly prolonged;
The normal-pressure sealed air insulation ring main unit avoids the risk of leakage of the pressure of the inflatable belt, and also has no application of sulfur hexafluoride isothermal chamber gas, so that the method is safe and environment-friendly; the sealed stainless steel box body 6 with the filtering function and the waterproof ventilation valve 15 can isolate dust, dirt and moist air in the running environment, so that a product insulation system can run stably and effectively in the whole life cycle, and the product comprises a breaker cabinet and a cabinet type of a load switch cabinet; the whole ring main unit is made of non-solid insulating materials except the supporting insulating piece and the sleeve, after the whole life cycle of the ring main unit is finished, the insulating medium is all air, no recovery or treatment measures are needed, the ring main unit is directly discharged into the environment, and more than 90% of the ring main unit can be recycled, so that the environmental protection performance of the product is improved;
In the prior art, SF6 gas is mostly adopted as an insulating medium, and the SF6 gas can be converted into various harmful and corrosive gases in the efficacy process of corona, spark and arc discharge when a circuit breaker is opened and closed, and the gases are released to cause harm to the atmospheric environment;
Under the air insulation environment, the isolation switch body 12 is connected with the cable sleeve 13 by adopting a special silicone rubber vulcanization solid sealing process, the circuit breaker, the isolation switch body 12 and the conductive part are all of single-phase independent air insulation structures, the conductive part of the ring main unit is subjected to electric field shielding and voltage equalizing treatment, the insulation service life requirement is met, the air clearance of the isolation fracture of the ring main unit is not less than 125mm, interphase insulation faults can be effectively prevented, the creepage distance is not less than 260mm, even if a small amount of dust and slight condensation phenomenon exist in the sealed stainless steel box 6, the insulation effectiveness can be ensured, the self-healing capacity of certain insulation performance is realized, and the service life of the product is greatly prolonged.
Example 3:
Referring to fig. 2, a permanent magnet switch quick-release mechanism 18 is arranged above one side of the inner side wall of the mechanism chamber body 5, which is close to the stainless steel box 6, an isolating switch operating mechanism 19 is arranged below the permanent magnet switch quick-release mechanism 18 on the inner side wall of the mechanism chamber body 5, and a spring is arranged inside the isolating switch operating mechanism 19;
in the prior art, when the grounding switch finishes the closing operation, the arcing time between the contacts is longer due to slower closing speed, the contact fusion welding condition is easy to be caused, the interaction force between the moving contact and the fixed contact is smaller, and the loosening and tool withdrawal condition still easily occurs after the moving contact is closed;
The grounding switch is in a knife switch type structure, the isolating switch operating mechanism 19 is in an energy storage over-Chinese type spring operating mode, the spring is compressed and stored energy when in operation, after the maximum compression amount is reached, the over-Chinese type spring is released, the rebound spring drives the grounding switch to conduct switching-on action, the transmission potential energy of the spring enables the switching-on speed of the grounding switch to reach 5-6 m/s, the switching-on time is within 25ms, the arcing time between contacts is less than 10ms, and burning loss caused by arc burning of the grounding contacts during switching-on can be effectively prevented; the contact pressure between the moving contact and the fixed contact is 280-300N, and after the moving contact is closed, enough contact holding force is provided to prevent the moving contact from being opened by electric force to cause fusion welding of the contact; after the grounding switch is switched on, the connecting line of the turning point of the moving contact and the main shaft transmission crank arm is an obtuse angle, so that the arm of force of the moving contact relative to the turning point is very small, and the phenomenon of tool withdrawal caused by the action of electric force at the moment of switching on can be effectively avoided.
When the sealing device is used, the stainless steel box 6 on the 10kV normal-pressure sealing air insulation ring main unit is welded by adopting a full-automatic laser welding process, so that all welding surfaces of the stainless steel box 6 can meet the airtight structural requirement, water vapor in the air in the external environment cannot enter the stainless steel box 6 from other places, when the temperature difference exists between the internal temperature of the stainless steel box 6 and the external temperature, the air can enter the sealed stainless steel box 6 from the outside through a channel, certain water vapor exists in the air, when the air enters the pressure balancing device 2, the air can pass through the labyrinth channel because the temperature of the inside of the labyrinth channel is inconsistent with the temperature of the outside or the inside of the box, the flow channel distance of the inside of the labyrinth channel is long, the water vapor in the air flows in the labyrinth channel, the energy of the water vapor is gradually reduced, when the water vapor reaches the tail end of the labyrinth channel, the water vapor is gradually converted into a liquid form by the action of gravity of the liquid, the liquid slowly flows out of the pressure balancing device 2 from the labyrinth channel, and a certain amount of dust is taken out at the same time when the liquid flows out; after a small amount of dust and moisture continuously pass through the tail end in the labyrinth passage, under the filtering action of the waterproof ventilation valve 15, a small amount of dust and moisture cannot enter the sealed stainless steel box 6, the filtered dust and moisture again flows back to the labyrinth passage and finally flows out of the pressure balancing device 2, and finally air entering the stainless steel box 6 is filtered, so that the requirement that the internal pressure of the stainless steel box 6 is always the same as the atmospheric pressure, and meanwhile, the moisture and the dust are prevented from entering the sealed stainless steel box 6 during gas exchange is met;
Under the air insulation environment, the isolation switch body 12 is connected with the cable sleeve 13 by adopting a special silicone rubber vulcanization and solid sealing process, the circuit breaker, the isolation switch body 12 and the conductive part are of single-phase independent air insulation structures, the conductive part of the ring main unit is subjected to electric field shielding and voltage equalizing treatment, the insulation service life requirement is met, the air clearance of the isolation fracture of the ring main unit is not less than 125mm, the inter-phase insulation fault can be effectively prevented, the creepage distance is not less than 260mm, even if a small amount of dust and slight condensation phenomenon exist in the sealed stainless steel box 6, the insulation effectiveness can be ensured, the self-healing capability of certain insulation performance is realized, and the service life of the product is greatly improved;
The grounding switch is in a knife switch type structure, the isolating switch operating mechanism 19 is in an energy storage over-Chinese type spring operating mode, the spring is compressed and stored energy when in operation, after the maximum compression amount is reached, the over-Chinese type spring is released, the rebound spring drives the grounding switch to conduct switching-on action, the transmission potential energy of the spring enables the switching-on speed of the grounding switch to reach 5-6 m/s, the switching-on time is within 25ms, the arcing time between contacts is less than 10ms, and burning loss caused by arc burning of the grounding contacts during switching-on can be effectively prevented; the contact pressure between the moving contact and the fixed contact is 280-300N, and after the moving contact is closed, enough contact holding force is provided to prevent the moving contact from being opened by electric force to cause fusion welding of the contact; after the grounding switch is switched on, the connecting line of the turning point of the moving contact and the main shaft transmission crank arm is an obtuse angle, so that the arm of force of the moving contact relative to the turning point is very small, and the phenomenon of tool withdrawal caused by the action of electric force at the moment of switching on can be effectively avoided.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (1)
1. The utility model provides a normal pressure sealed air insulation looped netowrk cabinet, includes base (7), base (7) upper surface one side is provided with nonrust steel box (6), base (7) upper surface opposite side is provided with mechanism room body (5), mechanism room body (5) upper surface is close to nonrust steel box (6) position department is provided with low pressure chamber body (4), a serial communication port, nonrust steel box (6) lateral wall keep away from one side top of mechanism room body (5) installs viewing window (1), nonrust steel box (6) lateral wall intermediate position department is close to viewing window (1) below is installed pressure balancing device (2), nonrust steel box (6) lateral wall intermediate position department is close to pressure balancing device (2) below is installed back closing cap (3), low pressure chamber (8) are installed to one side that nonrust steel box (6) were kept away from to low pressure chamber body (4) lateral wall, nonrust steel box (6) lateral wall keep away from one side of mechanism (6) is installed nonrust steel box (7), door plate (10) are kept away from to one side of nonrust steel box (6);
The stainless steel box is characterized in that an isolating switch body (12) is arranged at the middle position inside the stainless steel box (6), a primary charging part of a product is arranged inside the stainless steel box (6), the primary charging part of the product comprises a breaker cabinet and a load switch cabinet, three permanent magnet switch bodies (11) are arranged at the middle position of the upper surface inside the stainless steel box (6), and side expansion sleeves (14) are respectively arranged at the positions, corresponding to the three permanent magnet switch bodies (11), of the front side and the rear side of the inner side wall of the stainless steel box (6);
The waterproof ventilation valve (15) is arranged at the lower end of the permanent magnet switch body (11), the lower end of the waterproof ventilation valve (15) is connected with the isolating switch body (12), a cable sleeve (13) is arranged inside the stainless steel box body (6) and close to the lower part of the isolating switch body (12), a flexible connection (16) is arranged between the cable sleeve (13) and the isolating switch body (12), and a connecting busbar (17) is arranged on one side, away from the low-pressure chamber door plate (8), of the upper part of the inner side wall of the stainless steel box body (6);
A permanent magnet switch quick-release mechanism (18) is arranged above one side, close to the stainless steel box body (6), of the inner side wall of the mechanism chamber body (5), and an isolating switch operating mechanism (19) is arranged below the permanent magnet switch quick-release mechanism (18) of the inner side wall of the mechanism chamber body (5);
A sealing ring is arranged between the pressure balancing device (2) and the stainless steel box body (6), a ventilation structure of a labyrinth type channel is adopted in the stainless steel box body (6), two ventilation holes are formed in the lower end of the channel, a sealing gasket is arranged between the channel and the stainless steel box body (6), a ventilation hole connected with the stainless steel box body (6) is formed in the upper end of the sealing gasket, and a waterproof ventilation valve (15) is also arranged at the position of the stainless steel box body (6) corresponding to the ventilation hole;
the installation part of the waterproof ventilation valve (15) is provided with a transparent sealing plate, the rear part of the stainless steel box body (6) is of an open pore structure, and the isolating switch body (12) adopts a three-station disconnecting link structure;
The connection between the isolating switch body (12) and the cable sleeve (13) adopts a silicone rubber vulcanization sealing process, and the circuit breaker, the isolating switch body (12) and the conducting part adopt single-phase independent air insulation structures;
A spring is arranged in the isolating switch operating mechanism (19), and a grounding switch is also arranged in the mechanism chamber body (5); the isolating switch operating mechanism (19) is an energy storage overhead spring operating mode, the spring is compressed for energy storage when in operation, after the maximum compression amount is reached, the overhead spring is released, the rebound spring drives the grounding switch to conduct closing action, the transmission potential energy of the spring enables the closing speed of the grounding switch to reach 5-6 m/s, the closing time is within 25ms, the arcing time between contacts is less than 10ms, and burning loss caused by arc burning of the grounding contact during closing can be effectively prevented; the contact pressure between the moving contact and the fixed contact is 280-300N, and after the moving contact is closed, enough contact holding force is provided to prevent the moving contact from being opened by electric force to cause fusion welding of the contact; after the grounding switch is switched on, the connecting line of the turning point of the moving contact and the main shaft transmission turning arm is an obtuse angle, so that the arm of force of the moving contact relative to the turning point is very small.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311498222.6A CN117767163B (en) | 2023-11-10 | 2023-11-10 | Atmospheric sealing air insulation ring main unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311498222.6A CN117767163B (en) | 2023-11-10 | 2023-11-10 | Atmospheric sealing air insulation ring main unit |
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| Publication Number | Publication Date |
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| CN117767163A CN117767163A (en) | 2024-03-26 |
| CN117767163B true CN117767163B (en) | 2024-09-24 |
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| CN202311498222.6A Active CN117767163B (en) | 2023-11-10 | 2023-11-10 | Atmospheric sealing air insulation ring main unit |
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| Country | Link |
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| CN (1) | CN117767163B (en) |
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| CN105140802A (en) * | 2014-05-29 | 2015-12-09 | 江苏华厦电力成套设备有限公司 | Ventilation device for outdoor switch |
| CN210167717U (en) * | 2019-07-03 | 2020-03-20 | 赫兹曼电力（广东）有限公司 | Compact atmospheric-pressure sealed air insulation switch cabinet |
| CN114865521A (en) * | 2022-05-27 | 2022-08-05 | 广州拓益电气有限公司 | Environment-friendly gas insulation ring main unit |
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| DE10024356C1 (en) * | 2000-05-17 | 2001-10-11 | Felten & Guilleaume Ag | Gas-insulated switchgear device using vacuum switches supported within gas-insulated housing by fixing to housing front wall |
| CN203942194U (en) * | 2014-05-15 | 2014-11-12 | 华电高科(北京)电气有限公司 | Novel solid insulation high voltage switchgear |
| CN108695759A (en) * | 2018-08-08 | 2018-10-23 | 北京科锐配电自动化股份有限公司 | A kind of gas-insulated ring network cabinet with quick acting switching-off function |
| CN111554534B (en) * | 2020-05-12 | 2022-03-04 | 南京海兴电网技术有限公司 | Quick-closing high-voltage isolating switch |
| CN215378164U (en) * | 2021-03-08 | 2021-12-31 | 国网宁夏电力有限公司检修公司 | Ventilation device for box type equipment |
| CN215772181U (en) * | 2021-08-12 | 2022-02-08 | 明诏电气科技有限公司 | Damp-proof air insulation ring net cabinet |
| CN217115317U (en) * | 2021-12-26 | 2022-08-02 | 南京南轻金阳机械设备有限公司 | Damp-proof and breathable steel structure case |
| CN218070599U (en) * | 2022-07-28 | 2022-12-16 | 希格玛电气(珠海)有限公司 | Air drying equipment for ring main unit |
| CN116073274A (en) * | 2022-12-27 | 2023-05-05 | 江苏依斯特电力科技有限公司 | Air type environment-friendly breaker cabinet |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105140802A (en) * | 2014-05-29 | 2015-12-09 | 江苏华厦电力成套设备有限公司 | Ventilation device for outdoor switch |
| CN210167717U (en) * | 2019-07-03 | 2020-03-20 | 赫兹曼电力（广东）有限公司 | Compact atmospheric-pressure sealed air insulation switch cabinet |
| CN114865521A (en) * | 2022-05-27 | 2022-08-05 | 广州拓益电气有限公司 | Environment-friendly gas insulation ring main unit |
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| Publication number | Publication date |
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| CN117767163A (en) | 2024-03-26 |
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