CN115603217B - Load switch and environment-friendly gas-insulated combined electrical appliance ring main unit - Google Patents
Load switch and environment-friendly gas-insulated combined electrical appliance ring main unit Download PDFInfo
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- CN115603217B CN115603217B CN202211587705.9A CN202211587705A CN115603217B CN 115603217 B CN115603217 B CN 115603217B CN 202211587705 A CN202211587705 A CN 202211587705A CN 115603217 B CN115603217 B CN 115603217B
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- Prior art keywords
- disconnecting link
- grounding
- link mechanism
- static contact
- contact
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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
- H02B13/0354—Gas-insulated switchgear comprising a vacuum switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/003—Earthing switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
- H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact
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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
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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
- 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
- H02B13/075—Earthing arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention provides a load switch and an environment-friendly gas-insulated combined electrical appliance ring main unit, which belong to the technical field of electrical equipment and comprise a frame, an insulating housing, an isolation static contact, a vacuum arc extinguish chamber, a switching-off mechanism, an arc extinguish chamber driving mechanism, a disconnecting link mechanism, a main driving shaft and a grounding static contact, wherein the isolation static contact is arranged on the frame; the main driving shaft rotates to drive the disconnecting link mechanism and the arc extinguish chamber driving mechanism to rotate, so that the arc extinguish chamber driving mechanism is contacted with and separated from the disconnecting link mechanism, when the disconnecting link mechanism is contacted with the second connecting copper bar and rotates towards the direction of the isolation static contact, the movable contact and the static contact in the vacuum arc extinguish chamber are closed, and after the disconnecting link mechanism is contacted with the isolation static contact in place, the load switch is in a switching-on state; when the disconnecting link mechanism is separated from contact with the isolation fixed contact and rotates towards the direction of the second connecting copper bar, the movable contact and the fixed contact in the vacuum arc extinguish chamber are separated, and after the disconnecting link mechanism is separated from contact with the second connecting copper bar, the load switch is in a switching-off state; the disconnecting link mechanism continues to rotate until the disconnecting link mechanism is contacted with the grounding static contact, and the grounding state is realized.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a load switch and an environment-friendly gas-insulated combined electrical appliance ring main unit.
Background
In recent years, SF is used 6 The application of load switch-fuse combined electrical apparatus (hereinafter referred to as combined electrical apparatus) using gas as insulating medium in power distribution system is becoming more and more extensive. The combined electrical apparatus has the technical advantages of simple electrical wiring, rapid protection action, convenient maintenance and work and the like, and has economic advantages of high cost performance and the like, and is widely applied to medium and small-capacity transformer users. But SF 6 The gas is a greenhouse gas with serious harm and is limited in use and emission, so that a combined electrical cabinet taking environment-friendly gas as an insulating medium is needed to replace SF 6 A combined electrical appliance cabinet.
The existing combined electrical cabinet taking environment-friendly gas as an insulating medium needs two operating shafts and two sets of operating mechanisms, one set of operating mechanisms is responsible for the closing and opening actions of an arc extinguish chamber, the other set of operating mechanisms is responsible for the closing and opening actions of an isolating switch, and the actions of the two operating mechanisms are required to be sequential, so that a three-position switch can be operated after the vacuum arc extinguish chamber breaks a circuit, the three-position switch does not allow live operation, and the operation is complex.
Disclosure of Invention
The embodiment of the invention provides a load switch and an environment-friendly gas-insulated combined electrical appliance ring main unit, which have simple structures, can realize the opening and closing actions of an arc extinguish chamber and the actions of a three-position switch by only one operating mechanism, and are easy to operate.
In order to realize the purpose, the invention adopts the technical scheme that: there is provided a load switch including: the device comprises a frame, an insulating housing, an isolation static contact, a vacuum arc extinguish chamber, a switching-off mechanism, an arc extinguish chamber driving mechanism, a disconnecting link mechanism, a main driving shaft and a grounding static contact;
the insulating housing is fixed on the frame, the isolation static contact and the vacuum arc-extinguishing chamber are fixed on the insulating housing, and the isolation static contact is connected with the static end of the vacuum arc-extinguishing chamber through a first connecting copper bar;
the movable end of the vacuum arc extinguish chamber is connected with an arc extinguish chamber pull rod, and the arc extinguish chamber pull rod is connected with the brake separating mechanism; the movable end of the vacuum arc extinguish chamber is connected with a second connecting copper bar through flexible connection, and the second connecting copper bar is fixed on the insulating housing;
the disconnecting link mechanism and the arc extinguish chamber driving mechanism are connected to the main driving shaft, two ends of the main driving shaft are rotatably connected to the frame, and the grounding static contact is fixed on the frame;
the main driving shaft rotates to drive the disconnecting link mechanism and the arc extinguish chamber driving mechanism to rotate, so that the arc extinguish chamber driving mechanism is contacted with and separated from the disconnecting link mechanism, when the disconnecting link mechanism is contacted with the second connecting copper bar and rotates towards the direction of the isolation static contact, the movable contact and the static contact in the vacuum arc extinguish chamber are closed, and after the disconnecting link mechanism is contacted with the isolation static contact in place, the load switch is in a switching-on state; when the disconnecting link mechanism is separated from contact with the isolation fixed contact and rotates towards the direction of the second connecting copper bar, the moving contact and the static contact in the vacuum arc extinguish chamber are separated, and after the disconnecting link mechanism is separated from contact with the second connecting copper bar, the load switch is in a switching-off state; and the disconnecting link mechanism continues to rotate until the disconnecting link mechanism is contacted with the grounding static contact, so that the grounding state is realized.
With reference to the first aspect, in one possible implementation, the arc chute driving mechanism includes a cam fixed to the main drive shaft.
With reference to the first aspect, in one possible implementation manner, the arc extinguishing chamber driving mechanism further includes an arc extinguishing chamber driving roller fixed to the protruding end of the cam.
With reference to the first aspect, in a possible implementation manner, the opening mechanism includes a guide sleeve, a guide cylinder, an opening spring, a sealing cover, and an overtravel spring, the guide sleeve is sleeved outside the guide cylinder, the opening spring is sleeved on the guide cylinder, two ends of the opening spring elastically abut against between the insulating housing and a bottom plate of the guide cylinder, the overtravel spring is disposed in the guide cylinder, the sealing cover covers the guide cylinder, and a lower end of the arc extinguish chamber pull rod penetrates through the sealing cover, extends into the guide cylinder, and abuts against the overtravel spring.
With reference to the first aspect, in a possible implementation manner, a protrusion is disposed at the bottom of the guide cylinder, and a surface of the protrusion is an arc-shaped curved surface.
With reference to the first aspect, in a possible implementation manner, the insulating housing includes a housing, a vertical partition plate, a first fixing plate, a second fixing plate, a third fixing plate, and a fourth fixing plate, where the vertical partition plate divides the housing into a left area and a right area, one area is a disconnecting link mechanism avoiding area, and the other area is a vacuum arc-extinguishing chamber mounting area; the first fixing plate, the third fixing plate and the fourth fixing plate are sequentially arranged in the vacuum arc extinguish chamber mounting area from top to bottom; one end of the second connecting copper bar and one end of the flexible connection are fixed on the second fixing plate, and the other end of the flexible connection is limited between the third fixing plate and the fourth fixing plate; the vacuum arc extinguish chamber is limited between the first fixing plate and the third fixing plate, the arc extinguish chamber pull rod penetrates through the third fixing plate and the fourth fixing plate and the brake separating mechanism are connected, and the upper end of the brake separating spring is abutted to the lower surface of the fourth fixing plate.
In a second aspect, an embodiment of the present invention further provides an environment-friendly gas-insulated ring main unit, including a cabinet body, the load switch, a side extension sleeve, an auxiliary grounding mechanism, a fuse, a main grounding copper bar, and a lower outgoing line sleeve; the load switch is installed in the cabinet body, the side expansion sleeve is connected with the isolation static contact through a main bus, the disconnecting link mechanism is connected with the fuse through a branch copper bar and a first branch bus, the lower outgoing sleeve is connected to the fuse through a second branch bus, the main grounding copper bar is connected with the grounding static contact, and the auxiliary grounding mechanism is connected to the main driving shaft.
With reference to the second aspect, in a possible implementation manner, the auxiliary grounding mechanism includes a link assembly, an auxiliary grounding shaft, an auxiliary grounding switch, a guide plate, and an auxiliary grounding contact, the link assembly is connected between the main driving shaft and the auxiliary grounding shaft, the auxiliary grounding switch is connected to the auxiliary grounding shaft, the guide plate limits the movement of the link assembly, and the auxiliary grounding contact is installed on the lower outgoing line sleeve.
With reference to the second aspect, in one possible implementation manner, the link assembly includes a main crank arm, a transmission rod, a first link, a second link, a third link, and an auxiliary crank arm, which are sequentially hinged, the main crank arm is connected to the main driving shaft, and the auxiliary crank arm is connected to the auxiliary ground shaft; the guide plate is provided with a first vertical groove, a second vertical groove, a third vertical groove and a track groove, the transmission rod and a first pin shaft hinged to the first connecting rod are limited in the first vertical groove, a second pin shaft is further arranged at the lower end of the first connecting rod, the second pin shaft is limited in the second vertical groove, a third pin shaft hinged to the first connecting rod and the second connecting rod is limited in the third vertical groove, and a fourth pin shaft hinged to the second connecting rod is limited in the track groove.
Compared with the prior art, the load switch and the ring main unit of the environment-friendly gas-insulated combined electrical apparatus provided by the invention have the beneficial effects that: the load switch adopts a structure that an isolating switch is connected with the vacuum arc extinguish chamber in parallel, and the isolating switch consists of a disconnecting link mechanism, an isolating static contact and a grounding static contact, so that the number of parts is reduced, and the cost is reduced; meanwhile, the vacuum arc extinguish chamber only works in the switching-off and switching-on stages, and the time for current to pass through the vacuum arc extinguish chamber is only a few milliseconds, so that the cost and the size of the vacuum arc extinguish chamber are reduced; the main driving shaft is arranged, and the structure is simple and the operation is convenient through a set of operation mechanism; insulating material and environment-friendly gas (dry air) are adopted for insulation to replace SF 6 As an insulating and arc-extinguishing medium, reduces the pollution to the environmentAnd the device is safe, environment-friendly, pollution-free, compact in structure, convenient to maintain and the like.
Drawings
Fig. 1 is a schematic front view of a ring main unit of an environment-friendly gas insulated switchgear according to an embodiment of the present invention;
fig. 2 is a schematic view of an internal three-dimensional structure of an environment-friendly gas-insulated switchgear ring main unit according to an embodiment of the present invention;
fig. 3 is a schematic view of an internal three-dimensional structure of the ring main unit of the environment-friendly gas-insulated switchgear according to the embodiment of the present invention;
fig. 4 is a schematic view of a three-dimensional internal structure of the ring main unit of the environment-friendly gas-insulated switchgear according to the embodiment of the present invention;
fig. 5 is a schematic view of an internal three-dimensional structure of the ring main unit of the environment-friendly gas-insulated switchgear according to the embodiment of the present invention;
fig. 6 is a schematic view of an internal three-dimensional structure of the ring main unit of the environment-friendly gas-insulated switchgear according to the embodiment of the present invention;
fig. 7 is a schematic structural diagram (partial) of a main view of the ring main unit of the environment-friendly gas-insulated switchgear according to the embodiment of the present invention;
fig. 8 is a schematic side view (partially) of the ring main unit of the environmentally friendly gas insulated switchgear according to the embodiment of the present invention;
fig. 9 is a schematic perspective view (partial) of a ring main unit of the environmentally-friendly gas-insulated switchgear according to the embodiment of the present invention;
fig. 10 is a schematic top view of a load switch according to an embodiment of the present invention;
FIG. 11 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 10;
fig. 12 is a schematic perspective view of a load switch according to an embodiment of the present invention;
fig. 13 is a schematic perspective view of an insulating housing according to an embodiment of the present invention;
fig. 14 is a schematic perspective view of a guide plate according to an embodiment of the present invention;
fig. 15 is a first perspective view of a guide cylinder according to an embodiment of the present invention;
fig. 16 is a schematic perspective view of a guide cylinder according to an embodiment of the present invention;
fig. 17 is a schematic perspective view of a cam according to an embodiment of the present invention;
description of reference numerals:
1. laterally expanding a sleeve; 2. a main bus; 3. a frame; 4. an insulating housing; 401. a first fixing plate; 402. a second fixing plate; 403. a third fixing plate; 404. a fourth fixing plate; 405. a vertical partition plate; 406. a housing; 5. a first branch bus; 6. a fuse; 7. a transmission rod; 8. a main ground copper bar; 9. a third pin shaft; 10. a guide plate; 101. a first vertical groove; 102. a second vertical groove; 103. a third vertical groove; 104. a track groove; 11. a fourth pin shaft; 12. a third link; 13. an auxiliary grounding disconnecting link; 14. a second branch bus; 15. a lower outgoing line sleeve; 16. an operating mechanism; 17. a cabinet body; 18. a grounding static contact; 19. a disconnecting link mechanism; 20. a second pin shaft; 21. a first pin shaft; 22. an auxiliary ground shaft; 23. an auxiliary ground contact; 24. a first link; 25. a second link; 26. an auxiliary crank arm; 27. isolating the static contact; 28. a first connecting copper bar; 29. a vacuum arc-extinguishing chamber; 30. a second connecting copper bar; 31. branch copper bars; 32. soft connection; 33. a brake separating mechanism; 331. a brake opening spring; 332. a guide sleeve; 333. a guide cylinder; 334. an overtravel spring; 335. opening a brake roller; 336. a bump; 34. an arc extinguishing chamber driving mechanism; 341. an arc extinguish chamber driving roller; 342. a cam; 35. a main crank arm; 36. a main drive shaft; 37. and an arc extinguish chamber pull rod.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Referring to fig. 1 to 12 together, a load switch according to the present invention will now be described. The load switch comprises a frame 3, an insulating housing 4, an isolation static contact 27, a vacuum arc extinguish chamber 29, a switching-off mechanism 33, an arc extinguish chamber driving mechanism 34, a disconnecting link mechanism 19, a main driving shaft 36 and a grounding static contact 18;
the insulating housing 4 is fixed on the frame 3, the isolation static contact 27 and the vacuum arc-extinguishing chamber 29 are fixed on the insulating housing 4, and the isolation static contact 27 is connected with the static end of the vacuum arc-extinguishing chamber 29 through a first connecting copper bar 28;
the movable end of the vacuum arc extinguish chamber 29 is connected with an arc extinguish chamber pull rod 37, and the arc extinguish chamber pull rod 37 is connected with the brake separating mechanism 33; the movable end of the vacuum arc-extinguishing chamber 29 is connected with a second connecting copper bar 30 through a flexible connection 32, and the second connecting copper bar 30 is fixed on the insulating housing 4;
the knife switch mechanism 19 and the arc extinguish chamber driving mechanism 34 are connected to a main driving shaft 36, two ends of the main driving shaft 36 are rotatably connected to the frame 3, and the grounding static contact 18 is fixed on the frame 3;
the main driving shaft 36 rotates to drive the disconnecting link mechanism 19 and the arc extinguish chamber driving mechanism 34 to rotate, so that the arc extinguish chamber driving mechanism 34 is in contact with and separated from the disconnecting link mechanism 33, when the disconnecting link mechanism 19 is in contact with the second connecting copper bar 30 and rotates towards the direction of the isolation static contact 27, the movable and static contacts in the vacuum arc extinguish chamber 29 are closed, and after the disconnecting link mechanism 19 is in contact with the isolation static contact 27 in place, the load switch is in a switching-on state; when the disconnecting link mechanism 19 is separated from the contact with the isolation fixed contact 27 and rotates towards the direction of the second connecting copper bar 30, the moving contact and the static contact in the vacuum arc-extinguishing chamber 29 are separated, and after the disconnecting link mechanism 19 is separated from the contact with the second connecting copper bar 30, the load switch is in a switching-off state; the knife-switch mechanism 19 continues to rotate until it contacts the grounding static contact 18, and the grounding state is realized.
Compared with the prior art, the load switch combined environment-friendly gas insulated switchgear ring main unit provided by the invention has the beneficial effects that: the load switch adopts a structure that an isolating switch is connected with the vacuum arc-extinguishing chamber 29 in parallel, and the isolating switch consists of a disconnecting link mechanism 19, an isolating static contact 27 and a grounding static contact 18, so that the number of parts is reduced, and the cost is reduced; meanwhile, the vacuum arc-extinguishing chamber 29 only works at the switching-off and switching-on stages, and the time for current to pass through the vacuum arc-extinguishing chamber 29 is only a few milliseconds, so that the cost and the size of the vacuum arc-extinguishing chamber 29 are reduced; a main driving shaft 36 is provided, and the structure is simple,the operation is convenient; insulating material and environment-friendly gas (dry air) are adopted for insulation to replace SF 6 As an insulating and arc-extinguishing medium, the arc-extinguishing medium reduces pollution and damage to the environment, and has the characteristics of safety, environmental protection, no pollution, compact structure, convenient maintenance and the like.
In some embodiments, as shown in fig. 9-17, arc chute drive mechanism 34 includes a cam 342 fixed to main drive shaft 36. The cam 342 rotates along with the main driving shaft 36, when the convex end of the cam 342 abuts against the bottom of the guide cylinder 333, the spring in the opening mechanism 33 is compressed, and the arc extinguish chamber pull rod 37 is driven to move upwards, so that the moving and static contacts of the vacuum arc extinguish chamber 29 are closed; when the cam 342 is separated from the bottom of the guide cylinder 333, the moving and static contacts of the vacuum interrupter 29 are separated by the return action of the spring. The cam 342 may also be an eccentric.
As shown in fig. 9-17, in some embodiments, arc chute drive mechanism 34 further includes an arc chute drive roller 341 secured to the convex end of cam 342. The arc extinguishing chamber driving roller 341 abuts against the bottom of the guide cylinder 333 to achieve line-line contact, and when the force application line is coaxial with the arc extinguishing chamber tension rod 37, the pushing force of the arc extinguishing chamber driving mechanism 34 on the switching mechanism 33 reaches the maximum. Wherein, the arc extinguishing chamber drive roller 341 can be selected as a bearing.
In some embodiments as shown in fig. 9 to 17, the opening mechanism 33 includes a guide sleeve 332, a guide cylinder 333, an opening spring 331, a cover, and an overtravel spring 334, the guide sleeve 332 is sleeved outside the guide cylinder 333, the opening spring 331 is sleeved on the guide cylinder 333, two ends of the opening spring 331 elastically abut against between the insulating housing 4 and a bottom plate of the guide cylinder 333, the overtravel spring 334 is disposed in the guide cylinder 333, the cover is covered on the guide cylinder 333, and a lower end of the arc extinguishing chamber pull rod 37 penetrates through the cover and extends into the guide cylinder 333 and abuts against the overtravel spring 334. The guide sleeve 332 is connected to the bottom plate of the guide cylinder 333 by bolts.
The overtravel spring 334 acts: when the vacuum interrupter 29 is switched on, the interrupter driving mechanism 34 pushes the guide cylinder 333 to move, the guide cylinder 333 overcomes the elastic force of the switch-off spring 331 to drive the overtravel spring 334 and the interrupter pull rod 37 to move, after the vacuum interrupter 29 is switched on, the interrupter pull rod 37 does not move any more, the interrupter driving mechanism 34 pushes the guide cylinder 333 to extrude the overtravel spring 334, so that the overtravel spring 334 is compressed, and therefore good contact can be still kept after moving and static contacts of the vacuum interrupter 29 are abraded.
The insulating housing 4 is further provided with a brake separating roller 335, and the guide sleeve 332 is in rolling fit with the brake separating roller 335 to reduce the friction resistance of the brake separating mechanism 33. The separating brake roller 335 preferably adopts a bearing, and is simple and convenient to install.
As shown in fig. 11, 16 to 17, in some embodiments, a protrusion 336 is disposed at the bottom of the guiding cylinder 333, and the surface of the protrusion 336 is an arc-shaped curved surface. In combination with the cam 342 and the arc extinguishing chamber driving roller 341 provided on the cam 342, point-to-point contact can be realized.
In some embodiments, as shown in fig. 10, 12 to 13, the insulating housing 4 includes a housing 406, a vertical separation plate 405, a first fixing plate 401, a second fixing plate 402, a third fixing plate 403 and a fourth fixing plate 404, the vertical separation plate 405 separates the housing 406 into two areas, namely a left area and a right area, one area is an escape area of the disconnecting link mechanism 19, and the other area is an installation area of the vacuum interrupter 29; the first fixing plate 401, the third fixing plate 403 and the fourth fixing plate 404 are sequentially arranged in the mounting area of the vacuum arc-extinguishing chamber 29 from top to bottom; one end of the second connecting copper bar 30 and one end of the flexible connector 32 are fixed on the second fixing plate 402, and the other end of the flexible connector 32 is limited between the third fixing plate 403 and the fourth fixing plate 404; the vacuum interrupter 29 is held between the first fixing plate 401 and the third fixing plate 403, the interrupter rod 37 is connected to the opening mechanism 33 through the third fixing plate 403 and the fourth fixing plate 404, and the upper end of the opening spring 331 abuts against the lower surface of the fourth fixing plate 404.
The insulating housing 4 provides an insulating installation space for the opening mechanism 33, the disconnecting link mechanism 19 and the vacuum arc-extinguishing chamber 29. The two ends of the second fixing plate 402 are fixed on the two opposite side walls of the housing 406, and the fixing plates are parallel to each other and perpendicular to the vertical partition plate 405. The first connecting copper bar 28 is fixed on the first fixing plate 401, and the third fixing plate 403 and the fourth fixing plate 404 are provided with through holes or notches through which the arc extinguish chamber pull rod 37 passes.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Based on the same inventive concept, as shown in fig. 1 to 9, the embodiment of the present application further provides an environment-friendly gas-insulated combined electrical appliance ring main unit, which includes a cabinet body 17, a load switch, a side extension sleeve 1, an auxiliary grounding mechanism, a fuse 6, a main grounding copper bar 8 and a lower outlet sleeve 15; the load switch is installed in the cabinet body 17, the side expanded casing 1 is connected with the isolation static contact 27 through the main bus 2, the disconnecting link mechanism 19 is connected with the fuse 6 through the branch copper bar 31 and the first branch bus 5, the lower outgoing casing 15 is connected to the fuse 6 through the second branch bus 14, the main grounding copper bar 8 is connected with the grounding static contact 18, and the auxiliary grounding mechanism is connected to the main driving shaft 36.
As shown in fig. 1 to 9, in some embodiments, the auxiliary grounding mechanism includes a link assembly, an auxiliary grounding shaft 22, an auxiliary grounding switch 13, a guide plate 10 and an auxiliary grounding contact 23, the link assembly is connected between a main driving shaft 36 and the auxiliary grounding shaft 22, the auxiliary grounding switch 13 is connected to the auxiliary grounding shaft 22, the guide plate 10 limits the motion of the link assembly, and the auxiliary grounding contact 23 is mounted on the lower wire outlet sleeve 15.
In some embodiments, as shown in fig. 1 to 9, the link assembly includes a main crank arm 35, a transmission lever 7, a first link 24, a second link 25, a third link 12, and an auxiliary crank arm 26, which are hinged in this order, the main crank arm 35 being connected to a main drive shaft 36, and the auxiliary crank arm 26 being connected to an auxiliary ground shaft 22; a first vertical groove 101, a second vertical groove 102, a third vertical groove 103 and a track groove 104 are arranged on the guide plate 10, a first pin 21 of the transmission rod 7 hinged with the first connecting rod 24 is limited in the first vertical groove 101, a second pin 20 is further arranged at the lower end of the first connecting rod 24, the second pin 20 is limited in the second vertical groove 102, a third pin 9 of the first connecting rod 24 hinged with the second connecting rod 25 is limited in the third vertical groove 103, and a fourth pin 11 of the second connecting rod 25 hinged with the third connecting rod 12 is limited in the track groove 104.
The present embodiment provides three states of the load switch: closing, opening and grounding. When the switch is in the opening state, the movable end and the static end of the vacuum arc-extinguishing chamber 29 are in the separation state under the action of the opening spring 331. It should be noted that fig. 1, 2, 3, 8, 10, and 12 herein illustrate two states of the knife-switch mechanism 19, a closing state and a grounding state, and during normal use, the grounding state and the closing state do not exist at the same time, and the knife-switch mechanism 19 can only be selected to be in the closing state or the grounding state.
The embodiment of the application also provides a working process of the ring main unit of the environment-friendly gas-insulated combined electrical apparatus as follows:
when switching on and switching off, the main driving shaft 36 drives the disconnecting link mechanism 19 and the arc extinguish chamber driving mechanism 34 to rotate, when the disconnecting link mechanism 19 is just contacted with the second connecting copper bar 30, the arc extinguish chamber driving mechanism 34 is not yet contacted with the guide cylinder 333 in the disconnecting link mechanism 33, at the moment, the disconnecting link mechanism 19 is communicated with the movable end of the vacuum arc extinguish chamber 29, and the potentials of the disconnecting link mechanism 19 and the arc extinguish chamber 29 are the same; the main driving shaft 36 continues to rotate, the upper arc extinguish chamber driving roller 341 of the arc extinguish chamber driving mechanism 34 pushes the guide cylinder 333, so that the switch-off spring 331 and the overtravel spring 334 move in place, the moving contact and the static contact in the vacuum arc extinguish chamber 29 are closed, the circuit is switched on, the disconnecting link mechanism 19, the vacuum arc extinguish chamber 29, the second connecting copper bar 30 and the isolating static contact 27 are at the same potential, but the disconnecting link mechanism 19 is not in contact with the isolating static contact 27 at the moment; the main driving shaft 36 continues to rotate, the disconnecting link mechanism 19 is in contact with the second connecting copper bar 30 and the isolating static contact 27 until the disconnecting link mechanism 19 is separated from the second connecting copper bar 30 and is in contact with the isolating static contact 27 in place, the arc extinguish chamber driving mechanism 34 keeps the state unchanged, the switching-on process is achieved, and in the process, as the disconnecting link mechanism 19, the vacuum arc extinguish chamber 29, the second connecting copper bar 30 and the isolating static contact 27 are at the same potential, electric arcs cannot be generated. The knife-switch mechanism 19 is now in direct contact with the isolating stationary contact 27, so that the current does not pass through the vacuum interrupter 29.
After the switch is switched on, current flows through the main bus 2, the three-position switch and the fuse 6 from the side extension sleeve 1 and finally flows out from the lower outgoing sleeve 15.
When switching on and switching off, the disconnecting link mechanism 19 starts to rotate, simultaneously contacts the isolation static contact 27 and the second connecting copper bar 30, continues to rotate until the isolation static contact 27 is separated and the second connecting copper bar 30 is contacted, the arc extinguish chamber driving mechanism 34 keeps unchanged, and the movable and static contacts of the vacuum arc extinguish chamber 29 are in a closed state; the main driving shaft 36 continues to rotate, the arc extinguishing chamber driving roller 341 in the arc extinguishing chamber driving mechanism 34 is separated from contact with the guide cylinder 333, the moving and static contacts of the vacuum arc extinguishing chamber 29 are disconnected under the action of the opening spring 331, the disconnecting link mechanism 19 and the second connecting copper bar 30 are not completely separated from contact, at the moment, the current is disconnected in the vacuum arc extinguishing chamber 29, and arc extinguishing is completed by the vacuum arc extinguishing chamber 29; finally, the disconnecting link mechanism 19 and the second connecting copper bar 30 are completely separated from contact, and the switch is in a switching-off state.
When the switch is switched off to be grounded, the knife switch mechanism 19 is driven by the main driving shaft 36 until the knife switch mechanism is contacted with the grounding fixed contact 18, and grounding is completed.
When the switch is switched off to be grounded, the main driving shaft 36 also drives the main crank arm 35, the transmission rod 7, the first connecting rod 24, the second connecting rod 25, the third connecting rod 12 and the auxiliary crank arm 26 to rotate, and the auxiliary grounding knife switch 13 also contacts the auxiliary grounding contact 23 on the lower outlet sleeve 15 while the knife switch mechanism 19 contacts the grounding fixed contact 18, so that the simultaneous grounding up and down is completed; when the switch is in an opening or closing state, the auxiliary grounding knife switch 13 is far away from the auxiliary grounding contact 23.
The ring main unit of the environment-friendly gas-insulated combined electrical apparatus provided by the invention has the following beneficial effects:
(1) Insulating by means of insulating material and environment protecting gas and SF 6 Compared with a gas insulated combined electrical appliance ring main unit, the ring main unit has the characteristics of safety, environmental protection, no pollution, compact structure, convenience in maintenance and the like.
(2) The load switch with the structure that the isolating switch and the vacuum arc-extinguishing chamber 29 are connected in parallel is adopted to open and close the circuit, the structure is simple, and the cost is low; not only arc extinction in the switching-off process is considered, but also arc extinction in the switching-on process is considered, ablation of the disconnecting link and the isolation static contact 27 is reduced, and the service life of the product is prolonged.
(3) The first connecting rod 24 is additionally arranged on the auxiliary grounding mechanism, the first connecting rod 24 is provided with two hinge points, the reversing effect is achieved, the circular motion of the main crank arm 35 is converted into the motion in the vertical direction, and the motion precision of auxiliary grounding is improved.
(4) The fuse 6 adopted by the invention is lengthened and arranged in a straight line, and the insulating umbrella skirt is added, so that the creepage distance is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A load switch, comprising: the device comprises a frame (3), an insulating housing (4), an isolation static contact (27), a vacuum arc extinguish chamber (29), a switching-off mechanism (33), an arc extinguish chamber driving mechanism (34), a disconnecting link mechanism (19), a main driving shaft (36) and a grounding static contact (18);
the insulating housing (4) is fixed on the frame (3), the isolation static contact (27) and the vacuum arc-extinguishing chamber (29) are fixed on the insulating housing (4), and the isolation static contact (27) is connected with the static end of the vacuum arc-extinguishing chamber (29) through a first connecting copper bar (28);
the movable end of the vacuum arc-extinguishing chamber (29) is connected with an arc-extinguishing chamber pull rod (37), and the arc-extinguishing chamber pull rod (37) is connected with the brake-separating mechanism (33); the movable end of the vacuum arc extinguish chamber (29) is connected with a second connecting copper bar (30) through a flexible connection (32), and the second connecting copper bar (30) is fixed on the insulating housing (4);
the disconnecting link mechanism (19) and the arc extinguish chamber driving mechanism (34) are connected to the main driving shaft (36), two ends of the main driving shaft (36) are rotatably connected to the frame (3), and the grounding fixed contact (18) is fixed on the frame (3);
the main driving shaft (36) rotates to drive the disconnecting link mechanism (19) and the arc extinguish chamber driving mechanism (34) to rotate, so that the arc extinguish chamber driving mechanism (34) is contacted and separated with the disconnecting link mechanism (33), when the disconnecting link mechanism (19) is contacted with the second connecting copper bar (30) and rotates towards the direction of the isolation static contact (27), the movable and static contacts in the vacuum arc extinguish chamber (29) are closed, and after the disconnecting link mechanism (19) is contacted with the isolation static contact (27) in place, the load switch is in a closing state; when the disconnecting link mechanism (19) is separated from the isolation fixed contact (27) and rotates towards the direction of the second connecting copper bar (30), the moving contact and the static contact in the vacuum arc-extinguishing chamber (29) are separated, and after the disconnecting link mechanism (19) is separated from the second connecting copper bar (30), the load switch is in a switching-off state; and the disconnecting link mechanism (19) continues to rotate until the disconnecting link mechanism is contacted with the grounding static contact (18), so that the grounding state is realized.
2. The load switch of claim 1, wherein the arc chute drive mechanism (34) comprises a cam (342) secured to the main drive shaft (36).
3. The load switch of claim 2, wherein the arc chute drive mechanism (34) further comprises an arc chute drive roller (341) secured to the convex end of the cam (342).
4. The load switch according to claim 1, wherein the opening mechanism (33) comprises a guide sleeve (332), a guide cylinder (333), an opening spring (331), a cover and an overtravel spring (334), the guide sleeve (332) is sleeved outside the guide cylinder (333), the opening spring (331) is sleeved on the guide cylinder (333), two ends of the opening spring (331) elastically abut against between the insulating cover (4) and a bottom plate of the guide cylinder (333), the overtravel spring (334) is arranged in the guide cylinder (333), the cover covers the guide cylinder (333), and the lower end of the arc extinguishing chamber pull rod (37) penetrates through the cover to extend into the guide cylinder (333) and abut against the overtravel spring (334).
5. The load switch according to claim 4, wherein a protrusion (336) is provided at the bottom of the guide cylinder (333), and the surface of the protrusion (336) is an arc-shaped curved surface.
6. The load switch according to claim 4, characterized in that the insulating housing (4) comprises a shell (406), a vertical separation plate (405), a first fixing plate (401), a second fixing plate (402), a third fixing plate (403) and a fourth fixing plate (404), wherein the vertical separation plate (405) separates the shell (406) into a left area and a right area, one area is a disconnecting link mechanism (19) avoiding area, and the other area is a vacuum arc-extinguishing chamber (29) mounting area; the first fixing plate (401), the third fixing plate (403) and the fourth fixing plate (404) are sequentially arranged in the mounting area of the vacuum arc-extinguishing chamber (29) from top to bottom; one ends of the second connecting copper bar (30) and the flexible connection (32) are fixed on the second fixing plate (402), and the other end of the flexible connection (32) is limited between the third fixing plate (403) and the fourth fixing plate (404); vacuum interrupter (29) spacing in first fixed plate (401) with between third fixed plate (403), explosion chamber pull rod (37) pass third fixed plate (403) with fourth fixed plate (404) with separating brake mechanism (33) are connected, the upper end butt of separating brake spring (331) below fourth fixed plate (404).
7. An environment-friendly gas-insulated combined electrical appliance ring main unit, which is characterized by comprising a main unit (17), the load switch according to any one of claims 1 to 6, a side extension sleeve (1), an auxiliary grounding mechanism, a fuse (6), a main grounding copper bar (8) and a lower wire outlet sleeve (15); the load switch is installed in the cabinet body (17), the side expansion sleeve (1) is connected with the isolation static contact (27) through a main bus (2), the disconnecting link mechanism (19) is connected with the fuse (6) through a branch copper bar (31) and a first branch bus (5), the lower outgoing line sleeve (15) is connected to the fuse (6) through a second branch bus (14), the main grounding copper bar (8) is connected with the grounding static contact (18), and the auxiliary grounding mechanism is connected to the main driving shaft (36).
8. The ring main unit of environmental protection gas insulated switchgear as claimed in claim 7, wherein the auxiliary grounding mechanism includes a link assembly, an auxiliary grounding shaft (22), an auxiliary grounding switch (13), a guide plate (10) and an auxiliary grounding contact (23), the link assembly is connected between the main driving shaft (36) and the auxiliary grounding shaft (22), the auxiliary grounding switch (13) is connected to the auxiliary grounding shaft (22), the guide plate (10) limits the motion of the link assembly, and the auxiliary grounding contact (23) is mounted on the lower outgoing line sleeve (15).
9. The ring main unit of claim 8, wherein the link assembly comprises a main crank arm (35), a transmission rod (7), a first link (24), a second link (25), a third link (12) and an auxiliary crank arm (26) which are sequentially hinged, the main crank arm (35) is connected to the main driving shaft (36), and the auxiliary crank arm (26) is connected to the auxiliary grounding shaft (22); the guide plate (10) is provided with a first vertical groove (101), a second vertical groove (102), a third vertical groove (103) and a track groove (104), the transmission rod (7) and a first pin shaft (21) hinged to the first connecting rod (24) are limited in the first vertical groove (101), a second pin shaft (20) is further arranged at the lower end of the first connecting rod (24), the second pin shaft (20) is limited in the second vertical groove (102), a third pin shaft (9) hinged to the first connecting rod (24) and the second connecting rod (25) is limited in the third vertical groove (103), and a fourth pin shaft (11) hinged to the second connecting rod (25) and the third connecting rod (12) is limited in the track groove (104).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211587705.9A CN115603217B (en) | 2022-12-12 | 2022-12-12 | Load switch and environment-friendly gas-insulated combined electrical appliance ring main unit |
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| CN202211587705.9A CN115603217B (en) | 2022-12-12 | 2022-12-12 | Load switch and environment-friendly gas-insulated combined electrical appliance ring main unit |
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| CN115603217B true CN115603217B (en) | 2023-03-24 |
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| CN117116703A (en) * | 2023-10-20 | 2023-11-24 | 厦门顾德益电气股份有限公司 | Vacuum arc-extinguishing chamber module of environment-friendly gas cabinet |
| CN118398432A (en) * | 2024-06-25 | 2024-07-26 | 浙江正泰电气科技有限公司 | Load switch and ring main unit |
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| CN115603217A (en) | 2023-01-13 |
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