CN109119926B - Permanent magnet quick-break environment-friendly gas-insulated ring main unit - Google Patents
Permanent magnet quick-break environment-friendly gas-insulated ring main unit Download PDFInfo
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- CN109119926B CN109119926B CN201811229941.7A CN201811229941A CN109119926B CN 109119926 B CN109119926 B CN 109119926B CN 201811229941 A CN201811229941 A CN 201811229941A CN 109119926 B CN109119926 B CN 109119926B
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- isolating
- main unit
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- 230000007246 mechanism Effects 0.000 claims abstract description 73
- 230000005540 biological transmission Effects 0.000 claims abstract description 30
- 238000002955 isolation Methods 0.000 claims abstract description 24
- 230000003068 static effect Effects 0.000 claims abstract description 21
- 238000005516 engineering process Methods 0.000 claims abstract description 8
- 238000000265 homogenisation Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 238000009413 insulation Methods 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 12
- 230000005684 electric field Effects 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 1
- 230000005389 magnetism Effects 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 21
- 230000006872 improvement Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0352—Gas-insulated switchgear for three phase switchgear
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/045—Details of casing, e.g. gas tightness
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
The invention provides a permanent magnet quick-break environment-friendly gas-insulated ring main unit, which is internally provided with a circuit breaker, a disconnecting switch mechanism and a controller; the circuit breaker and the isolating switch are respectively connected with the controller, and the isolating switch mechanism is connected with the isolating switch; an upper isolation fixed contact is arranged at the bottom or the lower part of the circuit breaker; the isolating switch comprises a moving contact assembly, a rotating shaft, a transmission assembly and a grounding contact assembly, wherein the rotating shaft is connected with the moving contact assembly through the transmission assembly; the isolating switch mechanism drives the rotating shaft to rotate, so that the moving contact assembly is contacted with or separated from the upper isolating static contact; equalizing rings are arranged on the breaker and the isolating switch body; the outer side of the upper isolation static contact is provided with a pressure equalizing cover; and the outer ring and the inner ring of the equalizing ring are respectively provided with a rounding. By adopting the technical scheme of the invention, on the basis of a homogenization technology, the quick opening and closing of the switch is realized, and the purpose of quickly isolating a fault source and effectively protecting power distribution equipment is achieved.
Description
Technical Field
The invention belongs to the technical field of power distribution equipment, and particularly relates to a permanent magnet quick-break environment-friendly gas-insulated ring main unit.
Background
Along with the rapid development of the scale and economy of urban construction in China, higher requirements are put forward on the power distribution network, and particularly, the requirements on a distribution network switch are high-reliability, environment-friendly and intelligent. In the thirteenth and fifteen planning of the national power grid, the tasks of optimizing the power grid structure, improving the system safety level, upgrading and reforming the power distribution network and pushing the smart power grid construction are listed as important tasks, and the environment-friendly gas-insulated ring main unit is listed as an important popularization new technology catalogue (2017 edition). Meanwhile, in response to the call of the intelligent power grid greatly developed in China, the bid-calling proportion of the Guangdong power grid in the permanent magnet ring main unit in the multiple cities of the Buddha mountain, dongguan and Shenzhen in recent years is continuously improved. Therefore, the environment-friendly gas-insulated ring main unit and the permanent magnet mechanism are taken as environment-friendly and highly reliable typical representatives and have become the development trend of urban ring network equipment.
At present, most ring main units used in China are SF6 gas-insulated ring main units, and three types of ring main units are environment-friendly: mixed gas insulation ring main unit (little SF 6), composite insulation ring main unit (solid and environment-friendly gas composite insulation), environment-friendly gas insulation ring main unit. From the aspect of insulating media, the first two ring main units do not belong to the environment-friendly cabinet in the true sense, and belong to transition products. According to the key popularization of new technology catalogues (2017 edition) of the national power grid, the environment-friendly gas-insulated ring main unit is the development direction of the environment-friendly ring main unit in the future.
In the aspect of an operation mechanism, two types of electromagnetic type and spring type are adopted in a ring main unit, along with the continuous improvement of the requirements of a power grid, the electromagnetic operation mechanism is gradually eliminated due to large closing work and unstable closing speed, and the spring operation mechanism can be manually separated and combined when the electric operation fails, and the technology is relatively mature, so that the spring operation mechanism is mainly used in the market. The permanent magnet operating mechanism is a novel operating mechanism developed in recent years, has few components, simple structure and high reliability, can realize split-phase control, is particularly suitable for intelligent power grids, is commonly used in indoor vacuum circuit breakers in early days, and is applied to a ring main unit in the two years. The permanent magnet mechanism is structurally divided into a conventional permanent magnet mechanism arranged outside the ring main unit gas tank and a three-phase direct-acting quick-break permanent magnet mechanism arranged inside the gas tank.
At present, the problems and defects existing in the prior art are mainly as follows:
1) Although a small amount of SF6 is used in the mixed gas insulation ring main unit (little SF 6), the mixed gas insulation ring main unit is not environment-friendly in the real sense.
2) The composite insulation ring main unit is characterized in that solid and environment-friendly gas composite insulation is adopted inside an air box, part of high-voltage charged bodies are wrapped by epoxy resin, so that the purposes of enhancing insulation and reducing volume are achieved, but the structure is not environment-friendly because the adopted epoxy resin is a very difficult-to-degrade material, and is subject to the problems of air bubbles, impurities and cracking, which can cause partial discharge, and the problem same as that of the solid insulation ring main unit exists, so that the operation reliability is poor.
3) Most of environment-friendly gas-insulated ring main units in the current market adopt spring operating mechanisms, the mechanism has the advantages of more parts, complex transmission and higher failure rate, and the output force curve of the mechanism is not matched with the opening and closing curve of a switch.
4) The conventional ring main unit with the permanent magnet mechanism is characterized in that a permanent magnet coil is used for replacing an energy storage spring on the basis of a spring mechanism, so that transmission components of the mechanism are reduced, and compared with the spring mechanism, the ring main unit with the permanent magnet mechanism is higher in reliability, but the structure still has multistage transmission, and the requirement of fast switching on and switching off can not be met in action time, so that the technical specification of Guangdong power grid bidding can not be met.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a permanent magnet quick-break environment-friendly gas-insulated ring main unit, which is combined with a three-phase direct-acting quick-break permanent magnet mechanism on the basis of an electric field homogenization technology under the environment-friendly gas insulation, so that a switch is quickly switched on and off, is environment-friendly, and achieves the purposes of quickly isolating a fault source and effectively protecting power distribution equipment.
In this regard, the invention adopts the following technical scheme:
a permanent magnet quick-break environment-friendly gas-insulated ring main unit comprises a main unit body, wherein a circuit breaker, a disconnecting switch mechanism and a controller are arranged in the main unit body; the circuit breaker and the isolating switch are respectively connected with the controller, and the isolating switch mechanism is connected with the isolating switch;
the circuit breaker comprises a permanent magnet mechanism, a movable iron core, a brake separating spring, an insulating pull rod and a vacuum arc-extinguishing chamber, wherein the controller is electrically connected with the permanent magnet mechanism and sends out power-on and current signals, and the vacuum arc-extinguishing chamber is positioned under the movable iron core; the movable iron core is connected with the vacuum arc-extinguishing chamber through an insulating pull rod, and the movable iron core is connected with the brake separating spring; an upper isolation fixed contact is arranged at the bottom or the lower part of the circuit breaker;
the isolating switch comprises an isolating switch body, wherein the isolating switch body is provided with a moving contact assembly, a rotating shaft, a transmission assembly and a grounding contact assembly, the rotating shaft is rotationally connected with the isolating switch body, and the rotating shaft is connected with the moving contact assembly through the transmission assembly; the isolating switch mechanism is connected with the rotating shaft, drives the rotating shaft to rotate, and drives the moving contact assembly to rotate through the transmission of the transmission assembly, so that the moving contact assembly is contacted with or separated from the upper isolating static contact, and the closing or opening of the isolating switch is realized; the grounding contact assembly is positioned at the outer side below the upper isolation fixed contact and is positioned on the rotating stroke of the moving contact assembly;
equalizing rings are arranged on the breaker and the isolating switch body; the outer side of the upper isolation static contact is provided with a pressure equalizing cover; and the outer ring and the inner ring of the equalizing ring are respectively provided with a rounding. The transmission assembly may be a conventional transmission assembly such as a link transmission assembly.
By adopting the technical scheme, the isolating switch mechanism drives the rotating shaft to rotate, and drives the moving contact assembly to rotate through the transmission of the transmission assembly, so that the moving contact assembly is rotated to be contacted with the upper isolating static contact, and the isolating switch is switched on. After the isolating switch is switched on, a switching-on output command is sent out through a controller, a coil in a permanent magnet mechanism (three phases, one for each phase) is controlled to obtain switching-on current, a magnetic field in the same direction as the permanent magnet is generated, a movable iron core is driven to move downwards, a vacuum arc-extinguishing chamber is driven to switch on through an insulating pull rod, meanwhile, a switching-off spring is used for storing energy, and the permanent magnet enables the vacuum arc-extinguishing chamber to be kept at a switching-on position; so far, the ring main unit completes the closing action. In the switching-on process, as the permanent magnet coil is in linear transmission with the vacuum arc-extinguishing chamber, no moment conversion exists in the middle, loss in the moment conversion process and action delay generated by clearance fit are avoided, and technical guarantee is provided for realizing quick switching-on.
In addition, when the switch is opened, the controller sends out a switch-off output command, the permanent magnet coil of the permanent magnet mechanism is controlled to obtain reverse driving current, the magnetic flux of the switching-on magnetic circuit is weakened, the energy of the switch-off spring is released, and the insulating pull rod pulls the movable end of the vacuum arc-extinguishing chamber to move upwards under the drive of the movable iron core, so that the switch-off is completed. After the breaker is opened, the isolating switch mechanism drives the rotating shaft to rotate, so that the moving contact assembly is separated from the upper isolating static contact, and the isolating switch is opened. Thus, the ring main unit is completely opened. In the same way, in the brake separating process, the permanent magnet coil is in linear transmission to the vacuum arc extinguishing chamber, so that loss in the moment conversion process and action delay generated by clearance fit are avoided, and quick brake separating is realized.
When the isolating switch is grounded, the isolating switch mechanism drives the rotating shaft to rotate under the disconnecting state, so that the moving contact assembly is contacted with the grounding contact assembly, and the lower end of the ring main unit is grounded.
Further, the rotating shaft is a hexagonal rotating shaft.
Further, the ground contact assembly is located on the left side of the upper isolation fixed contact.
As a further improvement of the invention, the pressure equalizing cover is of a hemispherical structure, the diameter of the pressure equalizing cover is 3-4 times of the width of the movable contact assembly, and meanwhile, the gap between the pressure equalizing cover and the upper isolation fixed contact is 2-4mm.
Further, the diameter of the pressure equalizing cover is 70-90 mm, and the thickness of the pressure equalizing cover is 20-28 mm.
As a further improvement of the invention, the circuit breaker is provided with a first equalizing ring, the isolating switch body is provided with a second equalizing ring, and the rounding radii of the outer rings of the first equalizing ring and the second equalizing ring are respectively half of the thicknesses of the first equalizing ring and the second equalizing ring.
As a further improvement of the invention, the radius of the rounding of the outer ring of the first equalizing ring is 10-18 mm.
As a further improvement of the invention, the radius of the rounding of the outer ring of the second equalizing ring is 10-15 mm.
As a further improvement of the invention, the end part of the upper isolating static contact in the feeding direction is provided with a first rounding; the other end of the upper isolation static contact is provided with a second rounding radius, and the second rounding radius is smaller than the first rounding radius.
As a further improvement of the invention, the base edge of the upper isolating static contact is provided with a third rounded corner, and the radius of the third rounded corner is smaller than that of the second rounded corner.
As a further improvement of the invention, the isolating switch comprises an isolating support frame, and the moving contact assembly is rotationally connected with the isolating support frame.
As a further improvement of the invention, the circuit breaker further comprises a cam, a connecting assembly and a synchronizing shaft, wherein the movable iron core is connected with the connecting assembly, and the connecting assembly is connected with the insulating pull rod through the synchronizing shaft.
As a further improvement of the invention, a switch chamber, a mechanism chamber, a base and a secondary box are arranged in the cabinet body, the circuit breaker and the isolating switch are arranged in the switch chamber, and the isolating switch mechanism is arranged in the mechanism chamber; the base is provided with a sleeve, a pressure relief channel and a cabinet door; the controller is arranged in the secondary box; the controller is connected with the permanent magnet coil of the permanent magnet mechanism through an airtight aviation plug and a control wire.
Compared with the prior art, the invention has the beneficial effects that:
firstly, by adopting the technical scheme of the invention, the three-phase permanent magnet mechanism is adopted to directly drive the movable end of the three-phase vacuum arc-extinguishing chamber to act through the insulation pull rod, and the three-phase permanent magnet mechanism is in linear transmission, so that the loss generated by torque conversion and action delay caused by fit clearance do not exist, and quick switching on and off can be realized, thereby meeting the increasingly strict requirements of the national network and the south network on the response time of a power grid system; in particular to a 12kV ring network distribution system.
Secondly, the technical scheme of the invention adopts a large amount of electric field homogenization treatment, and by means of special conductor shapes, and special structure equalizing rings, equalizing covers and other measures, the invention ensures the electrical insulation performance of the SF6 ring main unit under the premise of ensuring the equivalent size of the SF6 ring main unit; in addition, the signal transmission between the permanent magnet mechanism coil and the external controller is realized through an airtight aviation plug arranged on the air box, so that the inside of the air box is ensured to be in a fully-insulated and fully-sealed environment, and the method is an important technical guarantee for the reliability of the ring main unit.
Drawings
Fig. 1 is a schematic sectional structure of a permanent magnet quick-break environment-friendly gas-insulated ring main unit.
Fig. 2 is a schematic structural diagram of a circuit breaker of a permanent magnet quick-break environment-friendly gas-insulated ring main unit.
Fig. 3 is a schematic structural diagram of an isolating switch of a permanent magnet quick-break environment-friendly gas-insulated ring main unit. The left diagram is a side structure schematic diagram, and the right diagram is a front structure schematic diagram.
Fig. 4 is a schematic structural diagram of a grading ring of a permanent magnet quick-break environment-friendly gas-insulated ring main unit. The left diagram is a side structure schematic diagram, and the right diagram is a front structure schematic diagram.
Fig. 5 is a schematic structural diagram of a pressure equalizing cover of a permanent magnet quick-break environment-friendly gas-insulated ring main unit. The left diagram is a side structure schematic diagram, and the right diagram is a front structure schematic diagram.
Fig. 6 is a schematic structural diagram of an upper isolated static contact of a permanent magnet quick-break environment-friendly gas-insulated ring main unit. The left diagram is a side structure schematic diagram, and the right diagram is a front structure schematic diagram.
The reference numerals include: 101-switch room, 102-circuit breaker, 103-isolating switch, 104-mechanism room, 105-transmission indicating mechanism, 106-isolating switch mechanism, 107-base, 108-controller, 109-aviation plug, 110-secondary box;
201-permanent magnet coils, 202-movable iron cores, 203-cams, 204-insulating pull rods, 205-vacuum arc-extinguishing chambers, 206-connecting components, 207-synchronous shafts, 208-control wires and 209-opening springs;
301-hexagonal rotating shafts, 302-isolating support frames, 303-moving contact assemblies, 304-grounding contact assemblies, 305-transmission assemblies, 307-isolating upper fixed contacts, 308-first equalizing rings, 309-equalizing covers and 310-second equalizing rings.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
As shown in fig. 1 to 6, a permanent magnet quick-break environment-friendly gas-insulated ring main unit includes a switch chamber 101, a mechanism chamber 104, a base 107 and a secondary box 110. A breaker 102, a disconnecting switch 103 and other power-on loops are arranged in the switch chamber 101; a transmission indicating mechanism 105 and a disconnecting switch mechanism 106 are arranged in the mechanism chamber 104; the base 107 is provided with a sleeve, a pressure relief channel, a cabinet door and the like; the secondary box 110 is provided with a controller 108 and other secondary components. The circuit breaker 102 and the isolating switch 103 are respectively connected with the controller 108, and the isolating switch mechanism 106 is connected with the isolating switch 103.
As shown in fig. 2, the circuit breaker 102 includes a permanent magnetic mechanism, a movable iron core 202, a brake separating spring 209, an insulating pull rod 204, and a vacuum arc-extinguishing chamber 205, wherein the controller is electrically connected with the permanent magnetic mechanism, and sends out power-on and current signals, and the vacuum arc-extinguishing chamber 205 is located under the movable iron core 202; the movable iron core 202 is connected with the vacuum arc-extinguishing chamber 205 through the insulating pull rod 204, and the movable iron core 202 is connected with the brake separating spring 209; the bottom or lower part of the circuit breaker 102 is provided with an isolating upper stationary contact 307. The circuit breaker 102 further comprises a cam 203, a connecting assembly 206 and a synchronizing shaft 207, wherein the movable iron core 202 is connected with the connecting assembly 206, and the connecting assembly 206 is connected with the insulating pull rod 204 through the synchronizing shaft 207 and the cam 203. The controller 108 is connected with a permanent magnet coil 201 of the permanent magnet mechanism through an airtight aviation plug 109 and a control wire 208
As shown in fig. 3, the isolating switch 103 includes an isolating switch 103 body, the isolating switch 103 body is provided with a moving contact assembly 303, a rotating shaft, a transmission assembly 305 and a grounding contact assembly 304, the rotating shaft is rotationally connected with the isolating switch 103 body, and the rotating shaft is connected with the moving contact assembly 303 through the transmission assembly 305; the isolating switch mechanism 106 is connected with the rotating shaft, drives the rotating shaft to rotate, and drives the moving contact assembly 303 to rotate through the transmission of the transmission assembly 305, so that the moving contact assembly 303 is contacted with or separated from the upper isolating fixed contact 307, and the closing or opening of the isolating switch 103 is realized; the ground contact assembly 304 is located on the outside below the upper isolation stationary contact 307 and on the path of rotation of the movable contact assembly 303. The isolating switch 103 comprises an isolating support frame 302, and the moving contact assembly 303 is rotatably connected with the isolating support frame 302.
As shown in fig. 1 to 3, the circuit breaker 102 is provided with a first equalizing ring 308, the isolating switch 103 is provided with a second equalizing ring 310, and the radius of the rounding of the outer ring of the first equalizing ring 308 and the second equalizing ring 310 is half of the thickness of the first equalizing ring 308 and the second equalizing ring 310 respectively. The outer side of the upper isolation static contact 307 is provided with a pressure equalizing cover 309; the outer ring and the inner ring of the first equalizing ring 308 and the second equalizing ring 310 are respectively provided with a chamfer.
In order to solve the problem of electric field concentration of the high-voltage electrode, particularly the electric field problem of the isolation fracture, the high-voltage electrode is subjected to structural optimization treatment, and the upper isolation fixed contact 307 is described below.
The end part of the upper isolation static contact 307 in the feeding direction is provided with a first rounding angle; the other end of the upper isolation static contact 307 is provided with a second rounded radius, which is smaller than the first rounded radius. The end part of the upper isolation static contact 307 in the feeding direction is provided with a first rounding angle; the other end of the upper isolation static contact 307 is provided with a second rounded radius, which is smaller than the first rounded radius. Specifically, as shown in fig. 6, the upper isolation stationary contact 307 is rounded off by R15 at the end in the feed direction to solve the electric field concentration between the isolation fractures, rounded off by R8 at the other end, and rounded off by R2 at the edge of the base 107 to optimize the electric field.
In addition, the equalizing ring, the equalizing cover 309 and the high-voltage electrode are optimized in structure, so that the problem of electric field homogenization is solved, and the equalizing ring, the equalizing cover and the high-voltage electrode are one of key technologies of the invention.
As shown in fig. 4, the first equalizing ring 308 is preferably made of aluminum alloy 6061, is designed to be fully round on the outside, is designed to be round with R3 round corners on the inner ring, and is analyzed by combining finite element analysis to analyze the field intensity at different thicknesses d of the first equalizing ring 308 and the round corner radius R of the outer ring of the first equalizing ring 308, and specific values E b As shown in table 1 below.
TABLE 1 shape parameter and field strength data table for first grading ring
| d(mm) | R(mm) | Eb(kV/mm) | Remarks |
| 5 | 2.5 | 5.23 | When d is less than or equal to 5, the nut cannot be wrapped |
| 10 | 5 | 3.78 | |
| 16 | 8 | 2.66 | |
| 18 | 9 | 2.95 | The inter-electrode gap becomes closer |
| 20 | 10 | 3.17 | When d is more than or equal to 20, the installation interference |
Preferably, the radius of the rounded corner of the outer ring of the first equalizing ring 308 is 10-18 mm. Further preferably, the thickness d of the second equalizing ring 310 of the first equalizing ring 308 is between 15 and 18mm, and the radius R of the rounded corner of the outer ring of the corresponding second equalizing ring 310 is between 7.5 and 9 mm.
As shown in fig. 4, the second equalizing ring 310 is preferably made of aluminum alloy 6061, has an outer diameter of a full round design, and has an inner ring with a round design R2, and is analyzed by a finite element analysis, under the thickness d of the second equalizing ring 310 and the radius R of the round of the outer ring of the second equalizing ring 310, the field strength at this point, the specific value E b As shown in table 2 below.
TABLE 2 shape parameter and field strength data table for second grading ring
| d(mm) | R(mm) | Eb(kV/mm) | Remarks |
| 5 | 2.5 | 4.73 | When d is less than or equal to 5, the bolts and the nuts cannot be wrapped |
| 10 | 5 | 2.96 | |
| 12 | 6 | 2.85 | |
| 15 | 7.5 | 3.55 | The inter-electrode gap becomes closer |
| 20 | 10 | 4.08 |
Preferably, the radius of the rounded corner of the outer ring of the second equalizing ring 310 is 10-15 mm. Further preferably, the thickness d of the second equalizing ring 310 is between 10 and 12mm, and the radius R of the rounded corner of the outer ring of the corresponding second equalizing ring 310 is between 5 and 6 mm.
As shown in FIG. 5, for the pressure equalizing cover 309, the material is preferably an aluminum alloy 6061, resembling a semi-sphere structure, having a diameter of ΦD and a thickness of H, and the field strength at this point is analyzed in conjunction with finite element analysis at different diameters of ΦD for the pressure equalizing cover 309 and thicknesses of H for the pressure equalizing cover 309Specific value E b As shown in table 3.
TABLE 3 shape parameters and field strength data table of pressure equalizing cover
Preferably, the diameter of the equalizing cover 309 is 70-90 mm (3-4 times the width of the moving contact), and the gap between the equalizing cover and the upper fixed contact is 2-4mm. Further preferably, Φd=80 mm and h=24 mm of the pressure equalizing cover 309.
The present embodiment is used for switching on and off a distribution network line, and the switching on and off operation is mainly completed by the circuit breaker 102 and the isolating switch 103, and the following description is given to the action part:
closing an isolating switch: the isolating switch mechanism 106 drives the hexagonal rotating shaft 301 to rotate clockwise, the driving component 305 drives the moving contact component 303 to rotate clockwise, and when the isolating switch mechanism rotates to the position A, the isolating switch mechanism contacts with the upper isolating fixed contact 307, and the isolating switch 103 is switched on.
Closing a circuit breaker: after the isolating switch 103 is switched on, a switching-on output command is sent out through the controller 108, and the switching-on output command passes through the airtight aviation plug 109 and the control wire 208 to a permanent magnet mechanism (three phases, one phase), a coil in the permanent magnet mechanism obtains switching-on current, a magnetic field in the same direction as that of a permanent magnet is generated, the movable iron core 202 is driven to move downwards, the vacuum arc-extinguishing chamber 205 is driven to switch on through the insulating pull rod 204, meanwhile, energy is stored for the switching-off spring 209, and the permanent magnet enables the vacuum arc-extinguishing chamber 205 to be kept at a switching-on position.
So far, the ring main unit completes the closing action.
In the switching-on process, as the permanent magnet coil 201 is in linear transmission with the vacuum arc-extinguishing chamber 205, no moment conversion exists in the middle, loss in the moment conversion process and action delay generated by clearance fit are avoided, and technical guarantee is provided for realizing quick switching-on.
The breaker is opened: the controller 108 sends out a brake-separating output command, the air-sealed aviation plug 109 and the control wire 208 are connected to the permanent magnet coil 201 (three phases are one for each phase), the permanent magnet coil 201 obtains reverse driving current, the magnetic flux of a closing magnetic loop is weakened, the energy of a brake-separating spring 209 is released, and the insulating pull rod 204 is driven by the movable iron core 202 to pull the movable end of the vacuum arc extinguishing chamber 205 to move upwards, so that brake separation is completed.
Disconnecting switch: after the breaker 102 is opened, the disconnecting switch mechanism 106 drives the hexagonal rotating shaft 301 to rotate anticlockwise, the driving component 305 drives the moving contact component 303 to rotate anticlockwise, and when the breaker rotates to the B position, the disconnecting switch 103 is opened. Thus, the ring main unit is completely opened.
In the same way, in the brake separating process, the permanent magnet coil 201 is in linear transmission with the vacuum arc extinguishing chamber 205, so that loss in the moment conversion process and action delay generated by clearance fit are avoided, and quick brake separating is realized.
The isolating switch is grounded: under the opening state of the isolating switch 103, the isolating switch mechanism 106 drives the hexagonal rotating shaft 301 to rotate anticlockwise, the moving contact assembly 303 is driven to rotate anticlockwise through the transmission assembly 305, the moving contact assembly rotates to the C position and contacts with the grounding contact assembly 304, and the lower end of the ring main unit is grounded.
By adopting the quick-breaking permanent magnet environment-friendly gas-insulated ring main unit of the embodiment, on the basis of an electric field homogenization technology under environment-friendly gas insulation, the three-phase direct-acting quick-breaking permanent magnet mechanism is combined, and the environment-friendly gas-insulated ring main unit of quick opening and closing of a switch is realized, so that the purposes of quickly isolating fault sources and effectively protecting power distribution equipment are achieved.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (5)
1. The utility model provides a permanent magnetism formula quick-break environmental protection gas-insulated looped netowrk cabinet, its characterized in that includes the cabinet body: the permanent magnet quick-break environment-friendly gas-insulated ring main unit combines a three-phase direct-acting quick-break permanent magnet mechanism on the basis of an electric field homogenization technology under environment-friendly gas insulation;
the cabinet body is internally provided with a circuit breaker, a disconnecting switch mechanism and a controller;
the circuit breaker and the isolating switch are respectively connected with the controller, and the isolating switch mechanism is connected with the isolating switch;
the circuit breaker comprises a permanent magnet mechanism, a movable iron core, a brake separating spring, an insulating pull rod and a vacuum arc-extinguishing chamber, wherein the controller is electrically connected with the permanent magnet mechanism and sends out power-on and current signals, and the vacuum arc-extinguishing chamber is positioned under the movable iron core; the movable iron core is connected with the vacuum arc-extinguishing chamber through an insulating pull rod, and the movable iron core is connected with the brake separating spring; an upper isolation fixed contact is arranged at the bottom or the lower part of the circuit breaker; the circuit breaker further comprises a cam, a connecting assembly and a synchronizing shaft, wherein the movable iron core is connected with the connecting assembly, and the connecting assembly is connected with the insulating pull rod through the synchronizing shaft and the cam;
the controller is connected with the permanent magnet coil of the permanent magnet mechanism through an airtight aviation plug and a control wire;
the isolating switch comprises an isolating switch body, wherein the isolating switch body is provided with a moving contact assembly, a rotating shaft, a transmission assembly and a grounding contact assembly, the rotating shaft is rotationally connected with the isolating switch body, and the rotating shaft is connected with the moving contact assembly through the transmission assembly; the isolating switch mechanism is connected with the rotating shaft, drives the rotating shaft to rotate, and drives the moving contact assembly to rotate through the transmission of the transmission assembly, so that the moving contact assembly is contacted with or separated from the upper isolating static contact, and the closing or opening of the isolating switch is realized; the grounding contact assembly is positioned at the outer side below the upper isolation fixed contact and is positioned on the rotating stroke of the moving contact assembly;
the circuit breaker is provided with a first equalizing ring, the isolating switch body is provided with a second equalizing ring, and the rounding radii of the outer rings of the first equalizing ring and the second equalizing ring are half of the thicknesses of the first equalizing ring and the second equalizing ring respectively; the outer ring and the inner ring of the first equalizing ring and the second equalizing ring are respectively provided with a rounding; the radius of the rounding angle of the outer ring of the first equalizing ring is 10-18 mm; the radius of the rounding angle of the outer ring of the second equalizing ring is 10-15 mm;
the outer side of the upper isolation static contact is provided with a pressure equalizing cover;
the end part of the upper isolation static contact in the feeding direction is provided with a first rounding angle; the other end of the upper isolation static contact is provided with a second rounding angle, and the radius of the second rounding angle is smaller than that of the first rounding angle;
the closing action, the opening action and the lower end of the ring main unit are grounded as follows:
the isolating switch mechanism drives the rotating shaft to rotate, drives the moving contact assembly to rotate through the transmission assembly, and rotates to be in contact with the upper isolating static contact, and the isolating switch is switched on; after the isolating switch is switched on, a switching-on output command is sent out through the controller, a coil in the three-phase permanent magnet mechanism is controlled to obtain switching-on current, a magnetic field in the same direction as the permanent magnet is generated, the movable iron core is driven to move downwards, the vacuum arc-extinguishing chamber is driven to switch on through the insulating pull rod, meanwhile, the switching-off spring is stored with energy, and the permanent magnet enables the vacuum arc-extinguishing chamber to be kept at a switching-on position; so far, the ring main unit completes the closing action;
when the switch is opened, the controller sends out a switch-off output command, a permanent magnet coil of the permanent magnet mechanism is controlled to obtain reverse driving current, the magnetic flux of a switching-on magnetic circuit is weakened, the energy of a switch-off spring is released, and the insulating pull rod pulls the movable end of the vacuum arc-extinguishing chamber to move upwards under the drive of the movable iron core, so that the switch-off is completed; after the breaker is opened, the isolating switch mechanism drives the rotating shaft to rotate, so that the moving contact assembly is separated from the upper isolating fixed contact, and the isolating switch is opened; the ring main unit is completely opened;
when the isolating switch is grounded, the isolating switch mechanism drives the rotating shaft to rotate under the disconnecting state, so that the moving contact assembly is contacted with the grounding contact assembly, and the lower end of the ring main unit is grounded.
2. The permanent magnet quick-disconnect environment-friendly gas-insulated ring main unit according to claim 1, wherein:
the pressure equalizing cover is of a hemispherical structure, the diameter of the pressure equalizing cover is 3-4 times of the width of a moving contact of the moving contact assembly, and meanwhile, the gap between the pressure equalizing cover and the upper isolation fixed contact is 2-4mm.
3. The permanent magnet quick-disconnect environment-friendly gas-insulated ring main unit according to claim 1, wherein:
the base edge of the upper static contact is provided with a third rounding angle, and the radius of the third rounding angle is smaller than that of the second rounding angle.
4. The permanent magnet quick-disconnect environment-friendly gas-insulated ring main unit according to claim 1, wherein:
the isolating switch comprises an isolating support frame, and the moving contact assembly is rotationally connected with the isolating support frame.
5. The permanent magnet quick-disconnect environment-friendly gas-insulated ring main unit according to claim 1, wherein:
the cabinet body is internally provided with a switch chamber, a mechanism chamber, a base and a secondary box, the circuit breaker and the isolating switch are arranged in the switch chamber, and the isolating switch mechanism is arranged in the mechanism chamber; the base is provided with a sleeve, a pressure relief channel and a cabinet door;
the controller is arranged in the secondary box.
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| CN201811229941.7A CN109119926B (en) | 2018-10-22 | 2018-10-22 | Permanent magnet quick-break environment-friendly gas-insulated ring main unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811229941.7A CN109119926B (en) | 2018-10-22 | 2018-10-22 | Permanent magnet quick-break environment-friendly gas-insulated ring main unit |
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| CN109119926B true CN109119926B (en) | 2023-11-28 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102020210912A1 (en) * | 2020-08-28 | 2022-03-03 | Siemens Aktiengesellschaft | A gas-insulated medium or high-voltage switchgear with a blade contact carrier |
| CN113035634B (en) * | 2021-03-12 | 2023-03-24 | 南方电网数字电网研究院有限公司 | Switch cabinet and switch assembly thereof |
| CN113824039A (en) * | 2021-10-29 | 2021-12-21 | 国网四川省电力公司眉山供电公司 | Atmospheric-pressure sealed air insulation ring main unit |
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| CN109119926A (en) | 2019-01-01 |
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