CN114664592A - Double-break isolating switch for expansion without power failure - Google Patents
Double-break isolating switch for expansion without power failure Download PDFInfo
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- CN114664592A CN114664592A CN202111601655.0A CN202111601655A CN114664592A CN 114664592 A CN114664592 A CN 114664592A CN 202111601655 A CN202111601655 A CN 202111601655A CN 114664592 A CN114664592 A CN 114664592A
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- 230000003068 static effect Effects 0.000 claims abstract description 75
- 210000001503 joint Anatomy 0.000 claims abstract description 20
- 238000005192 partition Methods 0.000 claims abstract description 16
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000007246 mechanism Effects 0.000 claims description 29
- 238000007789 sealing Methods 0.000 claims description 17
- 241000208199 Buxus sempervirens Species 0.000 claims description 5
- 238000002955 isolation Methods 0.000 description 15
- 230000009286 beneficial effect Effects 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 238000009413 insulation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000007704 transition Effects 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003032 molecular docking Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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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
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
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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
- H01H31/26—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
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Abstract
The invention relates to a double-break isolating switch for uninterrupted expansion, which comprises an outer shell, wherein an expansion butt joint end and a bus butt joint end are configured on the outer shell, an expansion static contact seat is fixed on the expansion butt joint end, a bus static contact seat is directly fixed on the bus butt joint end or indirectly fixed on the bus butt joint end through a conductor, the expansion static contact seat and the bus static contact seat are arranged at intervals, a corresponding movable contact seat is fixedly arranged between the expansion static contact seat and the bus static contact seat, more than two movable contacts are assembled in the movable contact seat in a guiding manner, two movable contacts are respectively correspondingly matched with the expansion static contact seat and the bus static contact seat to form a double-break structure, the outer shell is arranged in sections, adjacent sections are in sealed butt joint through a partition insulating basin, the partition insulating basin divides an inner cavity of the outer shell into two different sealed cavities, and the two breaks of the double-break structure are respectively arranged in the two different sealed cavities. According to the invention, the two fractures are respectively arranged in the two cavities which are not communicated with each other, so that the influence between the two fractures is avoided, and the safety and reliability are improved.
Description
Technical Field
The invention relates to the field of high-voltage alternating current and direct current power transmission and transformation, in particular to a double-break isolating switch for uninterrupted extension.
Background
With the continuous development of economy, the social power supply demand is larger and larger, and most of the existing GIS power stations are usually required to be expanded; meanwhile, in order to reduce the capital construction and operation and maintenance cost, a larger GIS power station generally needs to be built in different periods, a part which is built in advance is a first-period equipment part, a part which is expanded on the basis of the first-period equipment part is a long-period equipment part, only an expansion interface is reserved in the first-period equipment part, and a bus is required to be powered off during expansion; in addition, when a certain interval breaks down during GIS operation, the interval needs to be independently overhauled, the bus also needs to be powered off, and power failure means that the engineering construction progress is delayed, manpower and material resources are wasted, and economic loss is caused.
The existing technical schemes of extension and maintenance without power outage are more, and the scheme of extension, maintenance and withstand voltage test without power outage by adopting a double-break isolating switch is a hotspot of current research. The existing double-fracture isolating switch mainly has two types, one type is as follows: one of the two isolation fractures is in a switching-on position, and the other isolation fracture is in a switching-off position; for example, the invention patent application with application publication number CN112038156A discloses a double-break disconnecting switch and a high-voltage line connection structure, the outer shell of the disconnecting switch has a left and a right butt-joint ends, the two butt-joint ends are respectively provided with a static contact base, a movable contact base is arranged between the two static contact bases, a movable contact is assembled in the movable contact base in a guiding manner, an isolation break is formed between the movable contact and the static contact on the corresponding side, and one of the two isolation breaks is located at a closing position and the other is located at a breaking position. The other is as follows: two isolation breaks are in the open position or the close position simultaneously, for example, the double-break isolating switch module disclosed in the utility model with the publication number of CN 206331958U.
The isolator of two kinds of above-mentioned structures, two isolation fractures all are in same isolation gas chamber, if single isolation fracture takes place to puncture, gas in the whole isolation gas chamber receives the pollution, will lead to not taking place the insulating properties of the isolation fracture that punctures seriously to descend, often appears if one isolation fracture takes place to puncture easily, another isolation fracture also can be punctured easily, though set up two isolation fractures, nevertheless do not reach anticipated effect in essence, fail safe nature is low.
Disclosure of Invention
The invention aims to provide a double-break isolating switch for uninterrupted extension, which aims to solve the technical problem that in the prior art, if one isolating break breaks down, the other isolating break is easy to break down, so that the safety and the reliability are low.
In order to achieve the purpose, the technical scheme of the double-break isolating switch for the extension without power failure provided by the invention is as follows:
a double-break isolating switch for non-power-off extension comprises an outer shell, at least two butt-joint ends are arranged on the outer shell, part of each butt-joint end is an extension butt-joint end, part of each butt-joint end is a bus butt-joint end, an extension static contact seat is fixed on the extension butt-joint end, a bus static contact seat is directly fixed on the bus butt-joint end or indirectly fixed on the bus butt-joint end through a conductor, the extension static contact seat and the bus static contact seat which correspond to each other are arranged at intervals, a movable contact seat which corresponds to each other is fixedly arranged between the extension static contact seat and the bus static contact seat, more than two movable contacts are assembled in the movable contact seat in a guiding manner, two movable contacts are respectively matched with the extension static contact seat and the bus static contact seat to form a double-break structure, a driving mechanism for driving the movable contacts to move to realize switching is further arranged on the outer shell in a subsection manner, the adjacent two sections are in butt-joint through a partition insulating basin which separates an inner cavity of the outer shell into two different sealing cavities, the corresponding extension static contact seat and the bus static contact seat are respectively arranged in two different sealed cavities, so that two fracture parts of the double-fracture structure are respectively arranged in the two different sealed cavities.
The beneficial effects are that: according to the invention, the outer shell of the double-fracture isolating switch is divided into two independent sealed cavities which are not communicated with each other through the isolating insulation basin, and then the two fractures of the double-fracture isolating switch are respectively arranged in the two different independent sealed cavities, so that the two fractures are not influenced with each other, if one fracture breaks down, the insulation performance of the insulation gas in the other sealed cavity is not influenced, and further the insulation performance of the other fracture is not influenced, and the safety and reliability of the double fractures are improved in such a way.
As a further improvement, the driving mechanism comprises an operating mechanism positioned outside the outer shell and a transmission shaft which penetrates through the outer shell and is in transmission connection with the operating mechanism and the movable contact, and the part of the transmission shaft positioned in the outer shell and the extension static contact seat are positioned in the same sealed cavity.
The beneficial effects are that: when the transmission shaft is arranged, the transmission shaft is arranged in the outer shell and is arranged in the same sealed cavity with the extension static contact seat, and the sealed cavity where the extension static contact seat is arranged is a cavity far away from the live bus and is a sealed cavity isolated from the live bus, so that the safety performance is improved.
As a further improvement, the transmission shaft drives the movable contact to move in a guiding manner through the planar link mechanism, the bus static contact seat in the same phase and the movable contact correspondingly matched with the bus static contact seat are positioned in the same sealed cavity, and the link rod connected to the movable contact corresponding to the bus static contact seat hermetically slides through the partition insulating basin.
The beneficial effects are that: the invention drives the moving contact to move in a guiding way through the plane connecting rod mechanism, the moving contact corresponding to the bus static contact seat slides through the partition insulating basin in a sealing way through the connecting rod, the moving contact can be completely positioned in the sealing cavity where the bus static contact seat is positioned without penetrating through the partition insulating basin, the moving contact is protected, and meanwhile, compared with the moving contact, the connecting rod is easier to be arranged in the partition insulating basin in a sealing way.
The movable contact base corresponding to the movable contact base comprises two parts which are respectively arranged in two different sealed cavities, the movable contact base part in the sealed cavity at the same position as the bus static contact base is in guide fit and conductive contact with the movable contact correspondingly matched with the bus static contact base, a conductive insert block is arranged in the middle of the isolation insulation basin, and the movable contact base of each part is provided with a fixed end fixedly connected with the conductive insert block.
The beneficial effects are that: the movable contact seat is divided into two parts which are respectively fixed on two sides of the partition insulation basin, so that the processing and manufacturing difficulty of the movable contact seat is reduced, meanwhile, the movable contact seat guides the movable contact from a sealing cavity of the bus static contact seat, and the movable contact corresponding to the bus static contact seat is far away from the transmission shaft, so that the stability of the movable contact can be ensured after the movable contact seat is arranged.
As a further improvement, the plane connecting rod mechanism is a crank-slider mechanism.
The beneficial effects are that: the invention adopts the crank slider mechanism with simple structure, and simplifies the inner structure of the outer shell.
As a further improvement, a disk-shaped inner cavity is arranged in the movable contact base, the transmission shaft penetrates through the axis of the disk-shaped inner cavity, the crank comprises two arm plates which are parallel and spaced, a pin shaft is fixedly connected between the two arm plates, and connecting rods which are in transmission connection with the movable contacts are arranged between the two arm plates and hinged on the pin shaft.
The beneficial effects are that: the disc-shaped inner cavity of the crank is matched with the rotating path of the crank, so that the volume is reduced as much as possible; meanwhile, the outer surface and the inner surface of the disc-shaped inner cavity are both smooth surfaces, so that the electric field inside the sealed cavity is uniformly distributed.
As a further improvement, the shell body is also provided with a grounding end, the grounding end is connected with a grounding static contact seat in the inner cavity of the shell body, a grounding moving contact is also assembled on the corresponding moving contact seat in a guiding way, and the driving mechanism drives three moving contacts in the same phase at the same time.
The beneficial effects are that: the invention improves the safety of the equipment by arranging the grounding end, and simultaneously, the grounding moving contact is driven by the same driving mechanism, thereby simplifying the structure of the equipment and realizing the miniaturization of the equipment.
As a further improvement, the grounding static contact seat and the extension static contact seat of the corresponding phase are positioned in the same sealed cavity.
The beneficial effects are that: according to the invention, the grounding static contact seat and the extension static contact seat are arranged in the same sealed cavity, compared with the live bus side, the side of the outer shell close to the extension end is a position which is easier to be contacted by people, and after the arrangement, the safety of the side needing extension is improved.
As a further improvement, the guide moving paths of the two moving contacts corresponding to the bus static contact seat and the extension static contact seat are positioned on the same straight line, and the moving paths of the grounding moving contacts corresponding to the bus static contact seat and the extension static contact seat are obliquely arranged to form a certain included angle with the guide moving paths of the other two moving contacts.
The beneficial effects are that: after the arrangement, the two isolating fractures are linearly arranged, the grounding fracture is positioned on one radial side of the outer shell, the layout of the isolating switch is optimized, and the miniaturization design is realized.
As a further improvement, the double-break isolating switch is a three-phase common-box isolating switch, and the transmission shaft is simultaneously in transmission connection with the three-phase moving contact.
The beneficial effects are that: the isolating switch adopts the three-phase common box, so that the occupied space can be reduced, and the miniaturization design is realized.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a double-break disconnecting switch for uninterrupted extension of the invention (omitting a ground break structure in a third housing part);
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic diagram of a double-break disconnector in embodiment 1 of the present invention, where the double-break disconnector is in an isolated-tap ground state;
fig. 4 is a schematic diagram of a double-break disconnector used in expansion without power outage according to embodiment 1 of the present invention, where the double-break disconnector is in an isolated, grounded state;
fig. 5 is a schematic diagram of a double-break isolating switch for uninterrupted extension in embodiment 1 of the invention, in which the double-break isolating switch is in isolated joint;
fig. 6 is a front view of a crank in embodiment 1 of a double break disconnector for extension without power failure according to the present invention;
FIG. 7 is a right side view of FIG. 6;
fig. 8 is a diagram of a state of use of an embodiment 1 of a double-break disconnector for live-line operation of a first-stage equipment part and extension docking/maintenance of new equipment in the invention;
fig. 9 is a diagram of a state of use in a withstand voltage test of embodiment 1 of a double break isolator switch for uninterrupted extension in the present invention;
fig. 10 is a diagram of a state of use of embodiment 1 of a double-break disconnector for extension without power failure in normal live operation according to the present invention;
fig. 11 is a schematic diagram of a double-break disconnecting switch for uninterrupted extension according to embodiment 2 of the present invention in a use state;
description of reference numerals:
1. a double break isolator; 2. a bus moving contact; 3. a seal ring; 4. a first insulating basin; 5. a movable contact base; 51. a first movable contact base portion; 52. a second movable contact base portion; 53. a disc-shaped cavity; 6. a grounding static contact base; 7. expanding a static contact seat; 8. an outer housing; 81. a first housing portion; 82. a second housing portion; 83. a third housing portion; 9. a second insulating basin; 10. a conductor; 11. a bus static contact seat; 12. a grounding moving contact; 13. expanding a moving contact; 14. an operating mechanism; 15. a drive shaft; 16. a movable connecting rod; 17. a first link; 18. a third link; 19. a second link; 20. a crank; 201. an arm plate; 202. a pin shaft; 21. a conductive rod; 22. a transition grounding moving contact; 25. a transition grounding static contact seat; A. first-stage equipment; B. post-stage equipment; C. a circuit breaker.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrases "comprising an … …," or the like, do not exclude the presence of such elements, processes, or methods.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected internally or indirectly to each other. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
The invention provides a specific embodiment 1 of a double-break isolating switch for expansion without power failure, which comprises the following steps: as shown in fig. 1 to 11, the double-break disconnecting switch of the present invention is a three-position double-break disconnecting switch, and can realize three working states of disconnecting and grounding disconnecting, disconnecting and connecting and disconnecting and connecting.
The double-break isolating switch comprises an outer shell 8 and a double-break structure arranged in the outer shell 8; the outer shell 8 is arranged in sections, in the embodiment, the outer shell 8 is divided into three sections, namely a first shell part 81, a second shell part 82 and a third shell part 83, and the adjacent two sections of shell parts are in sealed butt joint through insulating basins, wherein the insulating basin between the first shell part 81 and the second shell part 82 is a first insulating basin 4, the first insulating basin 4 is a partition insulating basin, and the partition insulating basin divides an inner cavity of the outer shell 8 into two sealing chambers which are not communicated with each other, namely a first sealing chamber and a second sealing chamber; the insulating basin between the second housing portion 82 and the third housing portion 83 is a second insulating basin 9. Two bus butt joint ends are configured on the first shell part 81 of the outer shell 8, the two bus butt joint ends are arranged in a back-to-back manner, and the bus butt joint ends are used for being in butt joint connection with the existing main bus structure. When the isolating switch is used, the two bus butt ends are respectively in butt joint connection with the main bus structures on the two sides, so that the third shell part 83 forms one part of the main bus structure; the end of the second housing part 82 remote from the first housing part 81 is an extension docking end for connection with a remote device.
In this embodiment, the bus butt joint end is fixed with the bus static contact seat 11 through the conductor 10, and after the bus butt joint end is in structural grounding with the existing main bus, the conductor 10 serves as a part of the main bus, and then operates in an electrified manner before the later-stage equipment B is expanded. The extension butt joint end is fixed with extension stationary contact seat 7, and on extension stationary contact seat 7 fixed second insulation basin 9, the middle part of second insulation basin 9 had electrically conductive abaculus, extension stationary contact seat 7 and electrically conductive abaculus fixed connection, extension stationary contact seat 7 and the 11 interval arrangement of generating line stationary contact seat, generating line stationary contact seat 11 are located first sealed cavity, and extension stationary contact seat 7 is located the sealed cavity of second. The second housing portion 82 also has a ground terminal on its outer peripheral surface, which is connected to a ground stationary contact 6 in the interior of the outer housing 8.
A movable contact base 5 is fixedly arranged between the extension static contact base 7 and the bus static contact base 11, three movable contacts are assembled in the movable contact base 5 in a guiding manner, and two movable contacts are respectively in conductive fit with the extension static contact base 7 and the bus static contact base 11 correspondingly to form a double-break structure. One of the three moving contacts in conductive fit with the extension static contact seat 7 is an extension moving contact 13, and the extension moving contact 13 and the extension static contact seat 7 are positioned in a second sealed cavity; one of the bus moving contact 2 and the bus static contact 11 is matched with the bus static contact 11, and the bus moving contact 2 and the bus static contact 11 are positioned in a first sealing cavity; the other moving contact is a grounding moving contact 12 which is used for being in conductive fit with the grounding static contact seat 6, and the grounding moving contact 12 and the extension moving contact 13 are both positioned in the second sealed cavity.
In this embodiment, the movable contact base 5 includes two parts, the two parts are located in the first sealed chamber and the second sealed chamber, the movable contact base 5 part in the sealed chamber located at the same position as the bus fixed contact base 11 is the first movable contact base part 51, the other part is the second movable contact base part 52, the second movable contact base part 52 and the extension fixed contact base 7 are both located in the second sealed chamber, the first movable contact base part 51 and the second movable contact base part 52 are respectively located on two opposite sides of the first insulating basin 4, and the two movable contact base 5 parts are respectively and fixedly connected with the conductive insert block in the middle of the first insulating basin 4. Specifically, the first and second movable contact base portions 52 are respectively provided with a radial groove on the outer peripheral surface of one end fixedly connected with the conductive insert, a bolt hole is provided on the wall of one side of the radial groove close to the conductive insert, and a threaded hole is correspondingly provided on the conductive insert, so that during installation, the first and second movable contact base portions 52 are respectively fixed on the conductive insert by penetrating a bolt from the radial groove.
In this embodiment, the first movable contact base portion 51 is in guiding fit and conductive contact with the bus movable contact 2, meanwhile, the bus movable contact 2 is hinged with the movable connecting rod 16, the movable connecting rod 16 hermetically slides through the first insulating basin 4, and specifically, the sealing ring 3 is arranged between the movable connecting rod 16 and the conductive insert block which separates the middle part of the insulating basin, so as to ensure that when the movable connecting rod 16 moves left and right, gas between the first sealing chamber and the second sealing chamber cannot flow each other. In other embodiments, a bellows structure may be disposed outside the movable link 16 to achieve the sealing sliding of the movable link 16. The extension movable contact 13 and the grounding movable contact 12 are both installed in the second movable contact seat part 52 in a guiding way and are both in conductive contact with the second movable contact seat part 52. In this embodiment, the bus moving contact 2 and the extension moving contact 13 have the same linear guide moving path, and the moving path of the grounding moving contact 12 is obliquely arranged to form a certain included angle with the guide moving paths of the other two moving contacts.
In this embodiment, only one-phase double-break structure is arranged in the outer shell 8, the bus moving contact 2, the extension moving contact 13 and the grounding moving contact 12 of the phase are driven by the same set of driving mechanism, the driving mechanism comprises an operating mechanism 14 located outside the outer shell 8 and a transmission shaft 15 penetrating through the outer shell 8 and in transmission connection with the operating mechanism 14 and the three moving contacts, the part of the transmission shaft 15 located in the outer shell 8 and the extension stationary contact 7 are located in the same sealed cavity, and the transmission shaft 15 drives the three moving contacts to move in a guiding manner through a planar link mechanism.
In this embodiment, the second movable contact base portion 52 has a disk-shaped inner cavity therein, three radially extending columns are circumferentially spaced apart from each other in the disk-shaped inner cavity, one of the three columns is in guiding fit with the grounding movable contact 12, the other is in guiding fit with the extension movable contact 13, and the other is connected with the conductive insert on the partition insulating basin. The transmission shaft 15 penetrates through the axis of the disc-shaped inner cavity, the plane connecting rod mechanism is a crank 20 sliding block mechanism, the crank 20 sliding block mechanism comprises a crank 20, a first connecting rod 17 in transmission connection with the bus moving contact 2, a second connecting rod 19 in transmission connection with the extension moving contact 13 and a third connecting rod 18 in transmission connection with the grounding moving contact 12, the first connecting rod 17 is hinged with the moving connecting rod 16, and the second connecting rod 19 and the third connecting rod 18 are respectively hinged with the extension moving contact 13 and the grounding moving contact 12; the crank 20 comprises two parallel arm plates 201 at intervals, wherein the arm plate close to the transmission shaft in the two arm plates 201 is fixed with the transmission shaft, and the transmission shaft 15 does not penetrate through the crank 20; if the three-phase common box is adopted, the two arm plates 201 are respectively fixed with the transmission shafts on the two sides. A pin 202 is fixedly connected between the two arm plates 201, and the three connecting rods are all positioned between the two arm plates 201 and hinged on the pin 202. Wherein the first connecting rod 17 and the second connecting rod 19 are in the same plane and are hinged at different end positions of the crank 20, and the second connecting rod 19 and the third connecting rod 18 are in different planes, so as to avoid interference in the movement process of the three connecting rods.
In this embodiment, a transition chamber is formed in the third housing portion 83, a conductive rod 21 is provided in the transition chamber, two ends of the conductive rod 21 are respectively fixedly connected to the conductive insert blocks of the isolation insulation basins on two sides, a transition grounding moving contact 22 is installed in the conductive rod 21 in a guiding manner, a grounding terminal is also provided on the outer peripheral surface of the third housing portion 83, a transition grounding stationary contact seat 25 is provided on the grounding terminal, and a grounding fracture is formed between the transition grounding moving contact 22 and the transition grounding contact seat.
In the double-break isolating switch, when the transmission shaft 15 drives the crank 20 to rotate, the first connecting rod 17 and the second connecting rod 19 respectively drive the bus moving contact 2 and the extension moving contact 13 on the two sides to move back to back or in opposite directions, so that the double-break isolating switch can be switched on and off simultaneously, the third connecting rod 18 drives the grounding moving contact 12 to move so as to achieve the grounding switching on and off, and meanwhile, the single crank 20 is adopted to drive the bus moving contact 2, the extension moving contact 13 and the grounding moving contact 12 to move, so that the mechanical interlocking of a grounding break and the double-break isolating switch can be realized.
When the double-break isolating switch is used, the first shell part 81 is in butt joint with the existing main bus structure, at the moment, the conductor 10 in the first shell part 81 forms one part of a main bus, the double-break structure is in a disconnected state, two grounding breaks are in a closed state, at the moment, the bus static contact seat 11 and the main bus run in a live state, namely, live running of first-stage equipment A is realized, and extension butt joint or maintenance work of new equipment is carried out, as shown in fig. 8. Before the double-break disconnecting switch is in formal live-line operation, a voltage withstand test needs to be performed on the double-break disconnecting switch, as shown in fig. 9, at this time, the ground fracture in the third housing portion 83 is in an open state, and the ground fracture in the second housing portion 82 is in a closed state, so that the voltage withstand test can be performed on the double-break disconnecting switch. Finally, after the two grounding fractures are disconnected, the double-fracture structure can be switched on, so that the normal live operation of the later-stage equipment B is realized, as shown in fig. 10.
The double-break isolating switch provided by the invention realizes the uninterrupted extension and maintenance of the GIS power station, ensures the long-term uninterrupted reliable operation of a power grid, meets the special requirements of power transmission and transformation engineering, and can create economic benefits. In the invention, the extension static contact seat 7 and the bus static contact seat 11 are respectively positioned in two different sealed cavities which are not communicated with each other, namely two fractures are respectively positioned in two different sealed cavities which are not communicated with each other, so that the problem that one fracture is broken down to influence the insulating property of the other fracture is avoided, the safety and reliability of the double-fracture isolating switch are improved, and the purposes of extension and maintenance without power outage at intervals can be achieved.
The specific embodiment 2 of the double-break isolating switch for the extension without power failure provided by the invention is mainly different from the embodiment 1 in that: as shown in fig. 11, in this embodiment, the double-break disconnecting switch is of a three-phase common-box structure, a three-phase double-break structure is provided in the outer housing 8, a three-phase bus static contact seat 11 is fixed to the bus butt end through a three-phase conductor 10, and correspondingly, the extension static contact seat 7 and the grounding static contact seat 6 are also provided with three phases. At the moment, the three-phase double-break structure is arranged in a straight line shape, and one set of driving mechanism drives the three-phase double-break structure and the grounding break structure to be switched on and off simultaneously. Of course, in other embodiments, the three-phase double-fracture structure may also be arranged in a delta shape, and at this time, three sets of driving mechanisms need to be adopted to respectively drive the three-phase double-fracture structure.
The specific embodiment 3 of the double-break disconnecting switch for the extension without power failure provided by the invention is mainly different from the embodiment 1 in that: it is also possible to reserve only one busbar butt connection on the first housing part 81, which busbar butt connection is arranged opposite to the extension butt connection.
The specific embodiment 4 of the double-break isolating switch for expansion without power outage, which is provided by the invention, is mainly different from the embodiment 1 in that: in this embodiment, the number of the segments of the outer shell 8 may be only two, and only a partition insulating basin is provided between the first shell part 81 and the second shell part 82, and when the sealing device is used, the bus butt joint end and the extension butt joint end are respectively butted with corresponding supporting equipment to enable the sealing chamber to reach a closed state.
The specific embodiment 5 of the double-break disconnecting switch for the extension without power failure provided by the invention is mainly different from the embodiment 1 in that: the slider mechanism of the crank 20 is replaced by a rack and pinion structure adopted in the prior art, specifically, as disclosed in the utility model with the publication number of CN206331958U in the background art, at this time, the rack and pinion structure only drives the extension moving contact 13 and the bus fixed contact to move relatively or back to back, and the grounding moving contact 12 needs to be additionally provided with a set of driving mechanism to drive separately.
The specific embodiment 6 of the double-break disconnecting switch for the extension without power failure provided by the invention is mainly different from the embodiment 1 in that: the moving contact base 5 can also be of an integral structure, and the moving contact base 5 needs to penetrate through the first insulating basin 4 in a sealing mode. Alternatively, the first movable contact base portion 51 is not provided, but only the second movable contact base portion 52 is provided, and the movable contact is in sealed sliding engagement with the conductive insert.
The specific embodiment 7 of the double-break disconnecting switch for the extension without power failure provided by the invention is mainly different from the embodiment 1 in that: a drive shaft 15 and drive link 16 structure connecting the drive mechanism and the movable contacts may be located within the first sealed chamber.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double-break isolating switch for uninterrupted power expansion comprises an outer shell (8), at least two butt-joint ends are arranged on the outer shell (8), part of each butt-joint end is an expansion butt-joint end, part of each butt-joint end is a bus butt-joint end, an expansion static contact seat (7) is fixed on each expansion butt-joint end, a bus static contact seat (11) is directly fixed on each bus butt-joint end or indirectly fixed on each bus butt-joint end through a conductor (10), the expansion static contact seats (7) and the bus static contact seats (11) which correspond to each other are arranged at intervals, a movable contact seat (5) corresponding to each other is fixedly arranged between the expansion static contact seats and the bus static contact seats, more than two movable contacts are assembled in the movable contact seat (5) in a guiding manner, two movable contacts are respectively matched with the expansion static contact seats (7) and the bus static contact seats (11) correspondingly to form a double-break structure, and are also provided with a driving mechanism for driving the movable contacts to move in a guiding manner so as to realize a brake, the double-break structure is characterized in that the outer shell (8) is arranged in sections, two adjacent sections are in sealed butt joint through the partition insulating basins, the partition insulating basins divide an inner cavity of the outer shell (8) into two different sealed cavities, the corresponding extension static contact seat (7) and the bus static contact seat (11) are respectively arranged in the two different sealed cavities, and two breaks of the double-break structure are respectively arranged in the two different sealed cavities.
2. A double break disconnector according to claim 1, characterized in that the drive means comprise an actuator (14) outside the outer housing (8) and a transmission shaft (15) extending through the outer housing (8) and drivingly connecting the actuator (14) and the movable contact, the part of the transmission shaft (15) located inside the outer housing (8) being located in the same sealed chamber as the enlarged stationary contact (7).
3. A double-break disconnector according to claim 2, characterized in that the transmission shaft (15) drives the movable contacts to move in a guiding manner through a planar linkage mechanism, the bus bar stationary contact base (11) in the same phase and the movable contacts corresponding to the same are located in the same sealed chamber, and the connecting rod connected to the movable contact corresponding to the bus bar stationary contact base (11) slides in a sealing manner through the partition insulating basin.
4. A double break disconnector according to claim 3, characterized in that the corresponding moving contact base (5) comprises two parts, the two parts are located in two different sealed cavities, the moving contact base (5) part in the same sealed cavity with the bus bar stationary contact base (11) is in guiding fit and conductive contact with the moving contact correspondingly matched with the bus bar stationary contact base (11), a conductive insert block is arranged in the middle of the partition insulating basin, and the two parts of moving contact bases (5) both have fixed ends fixedly connected with the conductive insert block.
5. A double break disconnector according to claim 3, characterized in that said planar linkage is a crank (20) slider mechanism.
6. A double-break disconnecting switch according to claim 5, characterized in that a disc-shaped inner cavity is arranged in the movable contact base (5), the transmission shaft (15) penetrates through the axis of the disc-shaped inner cavity, the crank (20) comprises two parallel and spaced arm plates (201), a pin shaft (202) is fixedly connected between the two arm plates (201), and a connecting rod in transmission connection with each movable contact is positioned between the two arm plates (201) and is hinged on the pin shaft (202).
7. A double break disconnector according to any of claims 1-6, characterized in that the outer housing (8) is further provided with a grounding terminal, the grounding terminal is connected to a grounding stationary contact (6) in the inner cavity of the outer housing (8), the moving contact (5) corresponding to the grounding terminal is further equipped with a grounding moving contact (12), and the driving mechanism drives three moving contacts in phase at the same time.
8. Double break disconnector according to claim 7, characterized in that the grounded static contact (6) and the enlarged static contact (7) of the respective phase are located in the same sealed chamber.
9. The double break disconnector according to claim 8, wherein the guiding movement paths of the two moving contacts corresponding to the busbar stationary contact (11) and the extension stationary contact (7) are in the same straight line, and the movement path of the grounding moving contact (12) corresponding to the busbar stationary contact is obliquely arranged to form an included angle with the guiding movement paths of the other two moving contacts.
10. The double-break disconnecting switch according to any one of claims 2 to 6, wherein the double-break disconnecting switch is a three-phase common-box disconnecting switch, and the transmission shaft (15) is simultaneously in transmission connection with a three-phase movable contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111601655.0A CN114664592A (en) | 2021-12-24 | 2021-12-24 | Double-break isolating switch for expansion without power failure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111601655.0A CN114664592A (en) | 2021-12-24 | 2021-12-24 | Double-break isolating switch for expansion without power failure |
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| CN114664592A true CN114664592A (en) | 2022-06-24 |
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| CN202111601655.0A Pending CN114664592A (en) | 2021-12-24 | 2021-12-24 | Double-break isolating switch for expansion without power failure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115565829A (en) * | 2022-09-08 | 2023-01-03 | 正泰电气股份有限公司 | Drive structure and have its circuit breaker |
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| GB1255052A (en) * | 1968-02-22 | 1971-11-24 | Bbc Brown Boveri & Cie | A high voltage, metal clad switching device |
| CN201536079U (en) * | 2009-08-27 | 2010-07-28 | 广州白云电器设备股份有限公司 | Three position switch of high pressure gas-insulated switchgear device |
| CN112202093A (en) * | 2020-08-14 | 2021-01-08 | 平高集团有限公司 | GIS (gas insulated switchgear) uninterrupted power expansion device and transformer substation |
| CN112771740A (en) * | 2018-10-30 | 2021-05-07 | Ls电气株式会社 | Quick grounding switch of gas insulated switchgear |
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2021
- 2021-12-24 CN CN202111601655.0A patent/CN114664592A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1255052A (en) * | 1968-02-22 | 1971-11-24 | Bbc Brown Boveri & Cie | A high voltage, metal clad switching device |
| CN201536079U (en) * | 2009-08-27 | 2010-07-28 | 广州白云电器设备股份有限公司 | Three position switch of high pressure gas-insulated switchgear device |
| CN112771740A (en) * | 2018-10-30 | 2021-05-07 | Ls电气株式会社 | Quick grounding switch of gas insulated switchgear |
| CN112202093A (en) * | 2020-08-14 | 2021-01-08 | 平高集团有限公司 | GIS (gas insulated switchgear) uninterrupted power expansion device and transformer substation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115565829A (en) * | 2022-09-08 | 2023-01-03 | 正泰电气股份有限公司 | Drive structure and have its circuit breaker |
| CN115565829B (en) * | 2022-09-08 | 2023-11-24 | 正泰电气股份有限公司 | Driving structure and circuit breaker with same |
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