CN115410858B - A double-break isolating switch - Google Patents
A double-break isolating switch Download PDFInfo
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- CN115410858B CN115410858B CN202211266075.5A CN202211266075A CN115410858B CN 115410858 B CN115410858 B CN 115410858B CN 202211266075 A CN202211266075 A CN 202211266075A CN 115410858 B CN115410858 B CN 115410858B
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- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims description 25
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Classifications
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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
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
- H01H3/04—Levers
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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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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
本案提供的一种双断口隔离开关，驱动装置带动传动装置的传动杆和主动转轴同步转动，再由主动转轴的第一拐臂驱动第一夹叉装置，带动第一动触头在第一导向座在动触座的腔体内水平滑动。同时主动转轴的第二拐臂通带动连扳运动，驱动第二夹叉装置带动第二动触头在第二导向座在动触座的腔体内竖直滑动，驱动装置停止转动，从而驱动双断口隔离单元装置实现第一动触头、第二动触头分别与第一静触头装置、第二静触头装置的同步接触或同步分离，从而使隔离开关满足双断口合闸或分闸位置功能。相比于现有技术，具有零部件加工简单、装配和调试方便、分合闸相应速度快、传动平稳可靠等优点。
The present case provides a double-break disconnector, in which the driving device drives the transmission rod and the active shaft of the transmission device to rotate synchronously, and then the first crank arm of the active shaft drives the first clamping fork device to drive the first moving contact to slide horizontally in the cavity of the moving contact seat of the first guide seat. At the same time, the second crank arm of the active shaft drives the connecting plate to move, driving the second clamping fork device to drive the second moving contact to slide vertically in the cavity of the moving contact seat of the second guide seat, and the driving device stops rotating, thereby driving the double-break disconnector unit device to realize the synchronous contact or synchronous separation of the first moving contact and the second moving contact with the first static contact device and the second static contact device respectively, so that the disconnector meets the double-break closing or opening position function. Compared with the prior art, it has the advantages of simple parts processing, convenient assembly and debugging, fast opening and closing response speed, and stable and reliable transmission.
Description
Technical Field
The invention belongs to the technical field of high-voltage alternating-current and direct-current power transmission and transformation switches, and particularly relates to a double-break isolating switch.
Background
With the continuous development of national economy and power technology, the requirements of the system on power supply continuity and reliability are higher and higher. The large-scale gas-insulated metal-enclosed switchgear (GIS) power station is limited by factors such as basic construction, operation and maintenance, and the like, and generally needs to be built in stages, an extension interface is reserved in primary equipment, and isolating switch equipment is arranged between a standby interval and an operation bus.
However, the disconnector device has only one disconnection between the extension compartment and the operating bus. When the interval butt joint is installed, in order to avoid discharge faults of the isolation fracture and personnel injury, power failure treatment is required to be carried out on the operation bus. Meanwhile, when an alternating current withstand voltage test is carried out after the interval extension and maintenance, if the test voltage cannot keep the same frequency and the same phase with the operation voltage, dangerous working conditions of bearing reverse superposition of the test voltage and the operation voltage amplitude on the isolation fracture exist, in order to avoid the breakdown of the isolation fracture and endanger operation equipment, the current effective measures are to carry out power failure treatment on the operation bus, so that the difficulty of coordinated power failure of an operation unit is extremely high, and the technical requirement of important users on power supply continuity of the power system cannot be guaranteed.
At present, users clearly put forward the requirement that a double-fracture disconnecting switch needs to be arranged at a standby interval, and related researches are also hot spots for the industry. The isolating switch double-break structure in the prior art adopts a gear-rack transmission mode, the movable contact needs to be respectively internally and externally assembled with racks, the types of parts are various, and the processing and sub-packaging processes are complex. When the opening and closing operation is carried out, the movable contact can move in place only by driving the gear to rotate for a plurality of circles, the response speed is low, and the quick opening and closing of the switch are not facilitated.
Therefore, how to overcome the above technical drawbacks is a urgent problem for those skilled in the art.
Disclosure of Invention
The invention aims to provide a double-break isolating switch which is simple in structure, high in corresponding opening and closing speed and stable and reliable in transmission.
In order to solve the technical problems, the invention provides a double-break isolating switch, which comprises a shell, a double-break isolating unit device, a grounding unit device and a driving device, wherein the double-break isolating unit device and the grounding unit device are respectively arranged on the inner side of the shell, and the driving device is arranged on the outer side of the shell;
The double-fracture isolation unit device comprises a first disc insulator, a second disc insulator, a first fixed contact device, a second fixed contact device, a movable contact seat, a first guide seat, a second guide seat, a first movable contact, a second movable contact and a supporting unit, wherein the movable contact seat is arranged in a hollow cavity of the shell, the first guide seat and the second guide seat are arranged in an inner cavity of the movable contact seat, the first movable contact and the second movable contact are respectively arranged on the first guide seat and the second guide seat in a sliding manner, and the supporting unit supports the movable contact seat;
The double-fracture isolation unit device further comprises a transmission device which is used for realizing a double-fracture structure and simultaneously opening or closing, the transmission device comprises a transmission rod arranged outside the movable contact seat, and a driving rotating shaft and a connecting plate which are arranged inside the movable contact seat, the driving rotating shaft is rotatably arranged on the movable contact seat, a first crank arm and a second crank arm are arranged on the driving rotating shaft at intervals, the first crank arm is hinged with the first movable contact, the second crank arm is hinged with the connecting plate, the connecting plate is hinged with the second movable contact, and the transmission rod is used for connecting the driving device and the driving rotating shaft;
The moving paths of the first moving contact and the second moving contact are mutually perpendicular and are staggered at intervals on a plane perpendicular to the moving direction, the central axes of the first moving contact device and the second moving contact device which are oppositely arranged are respectively arranged in a centering way with the central axes of the first moving contact and the second moving contact, the first moving contact is correspondingly contacted and conducted with the first moving contact device, the second moving contact is correspondingly contacted and conducted with the second moving contact device, and the two moving contacts form a vertical double-break structure;
The upper end and the lower end of the shell in the vertical direction are respectively provided with a first flange interface for fixing the second disc insulator and the second fixed contact device, a second flange interface for fixing the supporting unit, a third flange interface for fixing the first disc insulator and the first fixed contact device, a fourth flange interface for fixing the grounding unit device, and a fifth flange interface for fixing a shaft seal cover plate, wherein the left end and the right end of the shell in the horizontal direction are respectively provided with a third flange interface for fixing the first disc insulator and the first fixed contact device;
the grounding unit device is used for realizing the grounding of the double-break isolating switch;
The driving device is arranged on the outer side of the shell and is used for driving the transmission device, so that the double-break isolating unit device is driven to realize synchronous opening and closing actions of the first moving contact and the second moving contact, and the double-break isolating switch can meet the function of double-break closing or opening positions.
Optionally, in the above dual-break isolating switch, the supporting unit includes an insulating support for fixing the movable contact base, and a supporting shield for connecting the second flange interface, so as to realize the installation and fixation of the movable contact base and the insulating function between the movable contact base and the housing.
Optionally, in the above dual-fracture isolating switch, the dual-fracture isolating unit device further includes a first shielding seat and a second shielding seat disposed at two sides of a connection position of the transmission rod and the movable contact seat.
Optionally, in the dual-fracture isolating switch, the first shielding seat and the second shielding seat are both in bowl-shaped structures with inner holes, and are coaxially and symmetrically fastened to two sides of the movable contact seat.
Optionally, in the above dual-fracture disconnecting switch, two ends of the driving rotating shaft are fixed on the first shielding seat and the second shielding seat through rolling bearings.
Optionally, in the double-break isolating switch, the first moving contact and the second moving contact are respectively connected with a first fork clamping device and a second fork clamping device, the first crank arm is connected with the first fork clamping device through a slidable shaft pin, the second crank arm is hinged with the connecting plate through a pin shaft, and the connecting plate is hinged with the second fork clamping device through a pin shaft.
Optionally, in the dual-break isolating switch, the first fork device is provided with a strip hole structure, and the strip hole structure is used for being connected with the first crank arm through the slidable shaft pin.
Optionally, in the above dual-fracture disconnecting switch, two side end portions of the driving rotating shaft are both set to be outer circular shafts and are provided with inner hexagonal holes thereon, and an end portion of the driving rod is provided with an outer hexagonal structure matched with the inner hexagonal holes of the driving rotating shaft.
Optionally, in the above dual-fracture disconnecting switch, the transmission device further includes a limiting device disposed outside the housing, and the limiting device is disposed between the driving device and the shaft seal cover plate, and is used for limiting the opening and closing rotation angle.
Optionally, in the double-break isolating switch, the number of the double-break isolating switches is three, and transmission rods of the three double-break isolating unit devices are connected end to end and realize synchronous opening and closing operation through one driving device.
The invention provides a double-break isolating switch, which has the beneficial effects that:
The driving device drives the transmission rod of the transmission device and the driving rotating shaft to synchronously rotate, and then the first crank arm of the driving rotating shaft drives the first fork clamping device to drive the first movable contact to horizontally slide in the cavity of the movable contact seat at the first guide seat. Meanwhile, the second crank arm of the driving rotating shaft is communicated with the connecting plate to move, the second fork clamping device is driven to drive the second moving contact to vertically slide in the cavity of the moving contact seat, and the driving device stops rotating, so that the double-fracture isolating unit device is driven to realize synchronous contact or synchronous separation of the first moving contact and the second moving contact with the first fixed contact device and the second fixed contact device respectively, and the isolating switch can meet the function of double-fracture closing or opening positions.
The transmission device mainly comprises a driving rotating shaft and a connecting plate, has few types of parts and simple processing and assembling processes. Compared with a gear-rack transmission mode, the connecting rod transmission structure is adopted, the requirement of moving travel of the moving contact can be met by rotating the main shaft for a plurality of circles and not being full of 1/4 circle, and under the condition that the turning arm rotation speeds of the driving rotating shafts are the same, the moving contact can obtain faster moving speed, and the response speed of opening and closing is improved.
In addition, the guiding moving paths of the first moving contact and the second moving contact are mutually perpendicular, and are designed in a staggered way at intervals on a plane perpendicular to the moving direction. Therefore, the moving guide paths of the two moving contacts are in two directions, and the axial design length of the contact seat is reduced. The two moving contacts are designed in a staggered manner at intervals, so that the design space of the inner cavity structure of the contact base can be effectively utilized, interference can not exist during opening and closing, and meanwhile, the overall size of the contact base is reduced as much as possible on the premise that the moving contacts meet larger opening distance and moving travel, and the miniaturization and integrated arrangement design of equipment are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a transmission system of a dual-port disconnecting switch according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a moving contact of a dual-port disconnecting switch in a disconnecting state according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a moving contact of a dual-break isolating switch in a closing state according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an internal structure of a dual-break isolation switch according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a dual-break isolation switch according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating an internal structure of a dual-break isolation switch according to another embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a dual-break isolating switch according to another embodiment of the present invention.
In the upper graph:
1-shell, 2-second disc insulator, 3-second fixed contact device, 4-second guide seat, 5-second moving contact, 6-second clamping fork device, 7-connecting plate, 8-grounding unit device, 801-first grounding unit device, 802-second grounding unit device, 803-third grounding unit device, 9-driving rotating shaft, 10-moving contact seat, 11-insulating support, 12-supporting shielding, 13-supporting unit, 131-first supporting unit, 132-second supporting unit, 133-third supporting unit, 14-first clamping fork device, 15-first moving contact, 16-first guide seat, 17-first fixed contact device, 18-first disc insulator, 19-first shielding seat, 20-second shielding seat, 21-transmission device, 211-first transmission rod, 212-second transmission rod, 213-third transmission rod, 22-shaft seal cover plate, 23-limiting device, 24-shell cover plate, 25-driving device, 26-261-first double-group double-break unit and 263-double-group double-break isolation device.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, horizontal, vertical, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the plural means that more than two are used for distinguishing technical features if the first and second are described only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
The invention has the core of providing a double-break isolating switch which has simple structure, high corresponding opening and closing speed and stable and reliable transmission.
In order to make the technical solution provided by the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The gas-insulated metal-enclosed switchgear (GIS) is a combined electrical equipment which is formed by organically combining a breaker, a disconnecting switch, a grounding switch, a transformer, a lightning arrester, a bus, a sleeve, a cable terminal and the like and is enclosed in a gas-insulated metal grounding shell for opening and closing a control system and protecting.
The isolating switch (DS for short) is extremely important safety equipment in the system, and is mainly used for safely isolating power failure equipment and circuits from an operation system, so that the safety of maintenance personnel and the power failure equipment is ensured. The function of the device is to have obvious isolation fracture, load current and short-circuit fault current, and the device has the capacity of switching bus and small capacitive current of the circuit.
The invention provides a double-break isolating switch, in particular to a double-break isolating switch suitable for uninterrupted extension, overhaul and test of a bus, which at least comprises a shell 1, a driving device 25 arranged on the outer side of the shell 1, and a double-break isolating unit device 26 and a grounding unit device 8 respectively arranged on the inner side of the shell 1.
The double-fracture isolation unit device 26 comprises a first disc insulator 18, a second disc insulator 2, a first fixed contact device 17, a second fixed contact device 3, a movable contact seat 10, a first guide seat 16, a second guide seat 4, a first movable contact 15, a second movable contact 5 and a supporting unit 13, wherein the movable contact seat 10 is arranged in a hollow cavity of the shell 1, the first guide seat 16 and the second guide seat 4 are arranged in an inner cavity of the movable contact seat 10, the first movable contact 15 and the second movable contact 5 are respectively arranged on the first guide seat 16 and the second guide seat 4 in a sliding manner, and the supporting unit 13 supports the movable contact seat 10. The movable contact base 10 is a casting with an inner cavity, and a first guide base 16 and a second guide base 4 with guiding and conductive contact functions and a first movable contact 15 and a second movable contact 5 which can slide in a guiding manner are fixedly connected in the casting.
The double-fracture isolating unit device 26 further comprises a transmission device 21 for realizing a double-fracture structure and simultaneously opening or closing, the transmission device 21 comprises a limiting device 23 arranged outside the shell 1, a transmission rod arranged outside the movable contact seat 10, and a driving rotating shaft 9 and a connecting plate 7 arranged inside the movable contact seat 10, the driving rotating shaft 9 is rotatably arranged on the movable contact seat 10, a first crank arm and a second crank arm are arranged on the driving rotating shaft 9 at intervals, the first crank arm is hinged with the first movable contact 15, the second crank arm is hinged with the connecting plate 7, the connecting plate 7 is hinged with the second movable contact 5, and the transmission rod is used for connecting the driving device 25 and the driving rotating shaft 9.
The moving paths of the first moving contact 15 and the second moving contact 5 are mutually perpendicular, the moving paths are designed in a staggered manner on a plane perpendicular to the moving direction at intervals, the central axes of the first moving contact device 17 and the second moving contact device 3 which are oppositely arranged are respectively arranged in a centering manner with the central axes of the first moving contact 15 and the second moving contact 5, the first moving contact 15 is correspondingly contacted and conducted with the first moving contact device 17, the second moving contact 5 is correspondingly contacted and conducted with the second moving contact device 3, and the two moving contacts form a vertical double-break structure.
The upper and lower ends of the housing 1 in the vertical direction are respectively provided with a first flange interface and a second flange interface, the first flange interface is used for fixing the second disc insulator 2 and the second fixed contact device 3, and the second flange interface is used for fixing the supporting unit 13. A third flange interface and a fourth flange interface are respectively arranged at the left end and the right end in the horizontal direction, the third flange interface is used for fixing the first disc insulator 18 and the first static contact device 17, and the fourth flange interface is used for fixing the grounding unit device 8. A fifth flange interface is provided at the front end in the horizontal direction for securing the shaft seal cover plate 22. At the rear end in the horizontal direction, a Six Codes th flange is provided for securing the housing cover 24 for sealing the joint.
The grounding unit device 8 is used for realizing the grounding of the double-break isolating switch. The electric isolating switch has an independent contact transmission system, is electrically interlocked with the existing isolating switch, and realizes the conductive grounding function of the movable contact base 10 during opening.
The driving device 25 is disposed outside the housing 1 and is used for driving the transmission device 21, so as to drive the double-break isolation unit device 26 to realize synchronous opening and closing actions of the first moving contact 15 and the second moving contact 5, so that the double-break isolation switch can meet the function of double-break closing or opening position. Specifically, the driving device 25 may be a motor operating mechanism or an electric spring operating mechanism, which can meet the requirement of slow opening and closing operation of the isolating switch device, and can also realize the requirement of fast opening and closing operation, and the application working conditions are more.
The guide movement paths of the first moving contact 15 and the second moving contact 5 are perpendicular to each other, and are offset from each other on a plane perpendicular to the movement direction. The two moving contacts are designed in a staggered way at intervals, so that the design space of a circular inner cavity structure of the contact seat can be effectively utilized, interference can not exist during opening and closing, and the moving contacts can reduce the overall size of the contact seat as much as possible on the premise of meeting larger opening distance and moving stroke, thereby realizing the miniaturization and integrated arrangement design of equipment.
The transmission device 21 mainly comprises a driving rotating shaft 9 and a connecting plate 7, and has few types of parts and simple processing and assembly processes. Compared with a gear-rack transmission mode, the connecting rod transmission structure is adopted, the requirement of moving travel of the moving contact can be met without rotating the main shaft for a plurality of circles or less than 1/4 circle, and under the condition that the turning arm rotation speed of the driving rotating shaft 9 is the same, the moving contact can obtain faster moving speed, and the response speed of opening and closing is improved. In addition, the different strokes of the first moving contact 15 and the second moving contact 5 of the isolating switch can be realized by reasonably setting the lengths of two axially-spaced crank arms on the driving rotating shaft 9 so as to meet the functional requirements of equipment with different voltage grades.
In the double-break isolating switch provided by the invention, as shown in fig. 2, in the closing and opening process, the driving device 25 rotates clockwise to drive the transmission rod of the transmission device 21 and the driving rotating shaft 9 to synchronously rotate, and then the first crank arm of the driving rotating shaft 9 drives the first fork clamping device 14 through the sliding shaft pin to drive the first movable contact 15 to horizontally slide rightward in the first guide seat 16 to the cavity of the movable contact seat 10. Meanwhile, the second crank arm of the driving rotating shaft 9 drives the connecting plate 7 to move through the shaft pin, the second fork clamping device 6 is driven to drive the second moving contact 5 to vertically slide downwards in the cavity of the moving contact seat 10 at the second guide seat 4, the driving device 25 stops rotating, synchronous separation of the first moving contact 15 and the second moving contact 5 from the first fixed contact device 17 and the second fixed contact device 3 is realized, and the requirement of a double-break isolation function of the isolating switch is met. The switching-on operation of the grounding unit system reliably contacts the conducting rod with the movable contact base 10, and reliable grounding of the movable contact base 10 and the conducting system is achieved.
As shown in fig. 3, in the process of separating from and closing the double-break isolating switch, the grounding unit system separates the conducting rod from the movable contact base 10, then the driving device 25 rotates anticlockwise to drive the transmission rod of the transmission device 21 and the driving rotating shaft 9 to rotate synchronously, and then the driving rotating shaft 9 drives the first moving contact 15 to slide horizontally leftwards to drive the second moving contact 5 to slide vertically upwards, so that synchronous closing of the first moving contact 15 and the second moving contact 5 with the first static contact device 17 and the second static contact device 3 is realized, and the requirement of the conducting and current-passing functions of the isolating switch is met.
Through the arrangement, the key technical problems of multiple parts of a transmission system, complex assembly and debugging process, large mechanical operation load work, slow response of opening and closing speed, weak expansion adaptability of equipment through-flow capacity and voltage class and the like of the existing double-fracture isolating switch for the high-voltage switch equipment can be effectively solved. In the switching-on and switching-off process, the device has the advantages of compact structure, fewer parts, simple assembly and debugging process, strong through-flow performance, high corresponding speed of switching-on and switching-off, stable and reliable transmission, wide expansibility and the like.
In a specific embodiment, the supporting unit 13 includes an insulating support 11 for fixing the movable contact 10 and a supporting shield 12 for connecting with a flange of the housing 1, so as to realize the installation and fixation of the movable contact 10 of the isolating switch and the insulation function between the high potential and the ground potential of the housing 1. Specifically, the insulating support 11 is an epoxy insulating table structure, and is used for supporting the movable contact 10 device, so as to realize potential insulation between the movable contact 10 device and the housing 1.
Further, a first guide seat 16 and a second guide seat 4 are designed in the movable contact seat 10, through holes are formed in the centers of the first guide seat 16 and the second guide seat 4, and guide rings and electrical connection contacts are arranged on the inner walls of the first guide seat 16 and the second guide seat. The two sides of each guide seat are provided with connecting flanges for fixing with the movable contact seat 10, so that the dual functions of guiding and conducting contact of the first movable contact 15 and the second movable contact 5 are realized. The guide seat and the movable contact seat 10 adopt a split design scheme, and under the condition of not changing the structural size, different conductivity materials (aluminum or copper and the like) are adopted, so that the requirements of different through-flow capacities of the equipment can be met, and the capacity expansibility is strong. The conductive loop is conducted to the guide seat and the movable contact seat 10 from the movable contact seat, so that the advantages of heat dissipation of the shielding through flow and larger heat dissipation space inside the movable contact seat 10 are fully utilized, and the structure is strong in through flow performance.
The first moving contact 15 and the second moving contact 5 can be driven by the driving rotating shaft 9 to realize synchronous contact and synchronous separation with the first fixed contact device 17 and the second fixed contact device 3 under the guide fit of the moving contact seat 10, so that the isolating switch can meet the function of double-break switch-on or switch-off positions.
In a specific embodiment, the dual-fracture isolation unit device 26 further includes a first shielding seat 19 and a second shielding seat 20 disposed at two sides of the connection between the transmission rod and the movable contact seat 10. Preferably, the first shielding seat 19 and the second shielding seat 20 are both in a bowl-shaped structure with inner holes, and are coaxially and symmetrically fastened to two sides of the movable contact seat 10. The connection parts of the two sides are shielded by the bowl-shaped appearance structures of the first shielding seat 19 and the second shielding seat 20, so that the electric field distribution of the outer surface can be improved. The two shielding seats are coaxially and symmetrically buckled on two sides of the movable contact seat 10. The shielding seat adopts an integrated design, so that the electric field distribution requirement of the outer surface is met, and the center rotation supporting function is realized.
In order to improve the smoothness of rotation, both ends of the driving rotary shaft 9 are fixed on the first shielding seat 19 and the second shielding seat 20 through rolling bearings.
In a specific embodiment, the first moving contact 15 and the second moving contact 5 are respectively connected with a first fork clamping device 14 and a second fork clamping device 6, the first crank arm is connected with the first fork clamping device 14 through a slidable shaft pin, the second crank arm is hinged with the connecting plate 7 through a pin shaft, and the connecting plate 7 is hinged with the second fork clamping device 6 through a pin shaft.
The first fork device 14 on the first moving contact 15 is arranged in a strip hole structure and is used for being connected with the first crank arm through a sliding shaft pin. The second fork clamping device 6 on the second movable contact 5 is arranged to be of a round hole structure. The first crank arm of the driving rotating shaft 9 is connected with the first fork clamping device 14 by adopting a sliding shaft pin, and check rings are arranged in clamping grooves at two ends of the shaft pin. The second crank arm of the driving rotating shaft 9 is hinged with the connecting plate 7 by adopting a pin hole shaft, check rings are arranged in clamping grooves at two ends of the shaft pin, the connecting plate 7 is hinged with the second fork clamping device 6 by adopting the pin hole shaft, and the check rings are arranged in the clamping grooves at two ends of the shaft pin.
The first moving contact 15 and the second moving contact 5 are hinged and connected by adopting a fork clamping device for transmission, so that compared with a rack transmission scheme, the length of the moving contact can be effectively reduced, the material cost and the weight are reduced, and the transmission load operation work is reduced. During opening and closing operation, the first fork clamping device 14 at the end part of the first moving contact 15 is connected through the shaft pin with the long-strip hole structure, so that the problem of lateral force applied to the sliding sides of the first moving contact 15 and the contact seat guide piece in the driving process of the driving rotating shaft 9 can be effectively solved, meanwhile, the lateral force applied to the end part of the second moving contact 5 by the connecting plate 7 is extremely small, and the ideal transmission efficiency and stable conductive contact technical requirements of the moving contact are met. The design swing angle of the connecting plate 7 in the vertical sliding direction of the second moving contact 5 is smaller when the opening and closing hinge rotates.
In a specific embodiment, two side ends of the driving rotating shaft 9 are designed into an outer circular shaft and an inner hexagonal hole structure, and the two crank arm structures are axially arranged on the driving rotating shaft 9 at intervals, and the included angle of the two crank arm structures can approach 90 degrees. Both ends of the transmission rod are provided with metal inserts which are of an external hexagonal structure and are directly matched and butted with the internal hexagonal end holes of the driving rotating shaft 9 supported in the movable contact seat 10. The assembly structure is convenient for accurately positioning the opening and closing positions of each phase, and ensures the synchronism of three-phase installation.
Further, the transmission device 21 further comprises a limiting device 23 arranged outside the shell 1, and the limiting device 23 is arranged between the driving device 25 and the shaft seal cover plate 22 and used for limiting the opening and closing rotation angle. The limiting device 23 can ensure that the contact switch-on/off is over-positioned caused by mechanical or manual misoperation, and has simple installation process and safe and reliable structure.
In a first embodiment, as shown in fig. 4 and 5, the number of the double-break isolating switches is one, that is, a single-phase structure, and specifically includes a set of double-break isolating unit devices 26, a transmission device 21 thereof, and a set of ground connecting unit systems.
In another embodiment, as shown in fig. 6 and 7, the number of the double-break isolating switches is three, that is, a three-phase common box structure, and the double-break isolating switches mainly comprise a three-phase common box shell 1, three groups of identical first double-break isolating unit devices 26, second double-break isolating unit devices 26, third double-break isolating unit devices 26, and three groups of identical first grounding unit devices 801, second grounding unit devices 802, and third grounding unit devices 803. The supporting unit 13 includes a first supporting unit 131, a second supporting unit 132, and a third supporting unit 133. The transmission device 21 includes a first transmission rod 211, a second transmission rod 212 and a third transmission rod 213, and is similar to the transmission rod structure of the first embodiment, the second transmission rod 212 is connected to the first double-break isolation unit device 261 and the second double-break isolation unit device 262, the third transmission rod 213 is connected to the second double-break isolation unit device 262 and the third double-break isolation unit device 263, and the driving device 25 drives the first transmission rod 211, the second transmission rod 212 and the third transmission rod 213 to realize synchronous opening and closing operations of the first double-break isolation unit device 261, the second double-break isolation unit device 262 and the third double-break isolation unit device 263.
Compared with the prior art schemes such as rack transmission, the single-phase or three-phase mechanical linkage operation can be met, the quick-acting and slow-acting operation can be met, the technical problems that in the prior scheme, the transmission system has more parts, high cost, complex assembly and debugging process, large mechanical operation load work, slow opening and closing speed response and weak equipment current capacity and voltage level expansion adaptability are solved, and the key functional requirements of the double-break isolating switch for uninterrupted power expansion, maintenance and test in the field of high-voltage switch equipment can be met.
To sum up, the dual-break isolating switch provided by the scheme has the following advantages:
1. Compared with the prior art, the invention adopts the connecting rod transmission device 21, only two main transmission parts of the driving rotating shaft 9 and the connecting plate 7 are arranged in the movable contact seat 10 of the group of double-fracture isolation unit devices 26, the hinging modes are shaft pin connection, the types of parts are few, and the processing and assembly processes are very simple, safe and reliable.
2. Compared with the prior art, the requirement of the moving stroke of the moving contact can be met by less than 1/4 circle of connecting rod transmission, the main shaft does not need to rotate for a plurality of circles, the moving contact can obtain a faster response speed, and the two technical requirements of slow motion and fast motion can be met by matching different driving devices 25.
3. Compared with the prior art, the first moving contact 15 and the second moving contact 5 are hinged and connected by the fork clamping device for transmission, so that the length of the moving contact can be effectively reduced, the material cost and the weight are reduced, and the transmission load operation work is reduced. In addition, on the basis of not changing a driving mechanism and a transmission ratio, the requirements of the isolating switch with different voltage grades on the fracture and the stroke can be met by only adjusting the length and the axis position of the crank arm of the driving rotating shaft 9, and the expansibility is strong.
4. The first fork clamping device 14 at the end part of the first moving contact 15 is connected through the shaft pin with the long-strip hole structure, so that the problem of sliding lateral stress of the guide piece of the first moving contact 15 and the contact seat in the driving process of the driving rotating shaft 9 can be effectively solved, meanwhile, the lateral force of the connecting plate 7 borne by the end part of the second moving contact 5 is extremely small, and the ideal transmission efficiency and stable conductive contact technical requirements of the moving contact are met.
5. Compared with the prior art, the transmission rod and the driving rotating shaft 9 are designed into a hexagonal assembly structure, so that the switching-on and switching-off positions of each phase are accurately positioned, the three-phase installation synchronism is guaranteed, the limit device 23 guarantees that the switching-on and switching-off of the contacts is over-positioned due to mechanical or manual misoperation, the installation process is simple, and the structure is safe and reliable.
6. Compared with the prior art, the split design scheme is adopted for the guide seat and the movable contact seat 10, and different conductivity materials (aluminum or copper and the like) are adopted under the condition that the structural size is not changed, so that the requirements of different through-flow capacities of the equipment can be met, and the capacity expansibility is strong. The conductive loop is conducted to the guide seat and the movable contact seat 10 from the movable contact seat, so that the advantages of heat dissipation of the shielding through flow and larger heat dissipation space inside the movable contact seat 10 are fully utilized, and the structure is strong in through flow performance.
7. The two moving contacts are designed in a staggered manner at intervals, so that the design space of the circular inner cavity structure of the contact base can be effectively utilized, interference can not exist during opening and closing, and meanwhile, the overall size of the contact base device is reduced as much as possible on the premise that the moving contacts meet larger opening distance and moving travel, and the miniaturization and integrated arrangement design of equipment is realized.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The double-break isolating switch is characterized by comprising a shell, a double-break isolating unit device, a grounding unit device and a driving device, wherein the double-break isolating unit device and the grounding unit device are respectively arranged on the inner side of the shell, and the driving device is arranged on the outer side of the shell;
The double-fracture isolation unit device comprises a first disc insulator, a second disc insulator, a first fixed contact device, a second fixed contact device, a movable contact seat, a first guide seat, a second guide seat, a first movable contact, a second movable contact and a supporting unit, wherein the movable contact seat is arranged in a hollow cavity of the shell, the first guide seat and the second guide seat are arranged in an inner cavity of the movable contact seat, the first movable contact and the second movable contact are respectively arranged on the first guide seat and the second guide seat in a sliding manner, and the supporting unit supports the movable contact seat;
The double-fracture isolation unit device further comprises a transmission device which is used for realizing a double-fracture structure and simultaneously opening or closing, the transmission device comprises a transmission rod arranged outside the movable contact seat, and a driving rotating shaft and a connecting plate which are arranged inside the movable contact seat, the driving rotating shaft is rotatably arranged on the movable contact seat, a first crank arm and a second crank arm are arranged on the driving rotating shaft at intervals, the first crank arm is hinged with the first movable contact, the second crank arm is hinged with the connecting plate, the connecting plate is hinged with the second movable contact, and the transmission rod is used for connecting the driving device and the driving rotating shaft;
The moving paths of the first moving contact and the second moving contact are mutually perpendicular and are staggered at intervals on a plane perpendicular to the moving direction, the central axes of the first moving contact device and the second moving contact device which are oppositely arranged are respectively arranged in a centering way with the central axes of the first moving contact and the second moving contact, the first moving contact is correspondingly contacted and conducted with the first moving contact device, the second moving contact is correspondingly contacted and conducted with the second moving contact device, and the two moving contacts form a vertical double-break structure;
The upper end and the lower end of the shell in the vertical direction are respectively provided with a first flange interface for fixing the second disc insulator and the second fixed contact device, a second flange interface for fixing the supporting unit, a third flange interface for fixing the first disc insulator and the first fixed contact device, a fourth flange interface for fixing the grounding unit device, and a fifth flange interface for fixing a shaft seal cover plate, wherein the left end and the right end of the shell in the horizontal direction are respectively provided with a third flange interface for fixing the first disc insulator and the first fixed contact device;
the grounding unit device is used for realizing the grounding of the double-break isolating switch;
The driving device is arranged on the outer side of the shell and is used for driving the transmission device, so that the double-break isolating unit device is driven to realize synchronous opening and closing actions of the first moving contact and the second moving contact, and the double-break isolating switch can meet the function of double-break closing or opening positions.
2. The double-break disconnector according to claim 1, characterized in that the support unit comprises an insulating support for fixing the movable contact and a support shield for connecting the second flange interface for the mounting fixation of the movable contact and its insulating function with the housing.
3. The double-break isolating switch as in claim 1, further comprising a first shield seat and a second shield seat disposed on both sides of the junction of the transmission rod and the movable contact seat.
4. The isolating switch as in claim 3, wherein said first and second shield sockets are bowl-shaped structures having inner bores, and are fastened to two sides of said movable contact socket coaxially and symmetrically.
5. A double-break isolating switch as in claim 3, wherein both ends of said active shaft are secured to said first and second shield mounts by rolling bearings.
6. The double-break isolating switch according to claim 1, wherein the first moving contact and the second moving contact are respectively connected with a first fork clamping device and a second fork clamping device, the first crank arm is connected with the first fork clamping device through a sliding shaft pin, the second crank arm is hinged with the connecting plate through a pin shaft, and the connecting plate is hinged with the second fork clamping device through a pin shaft.
7. The dual-break disconnector of claim 6, in which the first fork means is provided with an elongated hole structure for connection with the first lever arm via the slidable axle pin.
8. The double-break isolating switch as claimed in claim 1, wherein the two side ends of the driving shaft are both provided with an outer circular shaft and an inner hexagonal hole is formed therein, and the end of the driving rod is provided with an outer hexagonal structure for being matched with the inner hexagonal hole of the driving shaft.
9. The double-break isolating switch of claim 1, wherein the transmission further comprises a limiting device arranged outside the housing, the limiting device being arranged between the driving device and the shaft seal cover plate for limiting the opening/closing rotation angle.
10. The double-break isolating switch according to any one of claims 1-9, wherein the number of the double-break isolating switches is three, and the transmission rods of three double-break isolating unit devices are connected end to end and realize synchronous opening and closing operation through one driving device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211266075.5A CN115410858B (en) | 2022-10-17 | 2022-10-17 | A double-break isolating switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211266075.5A CN115410858B (en) | 2022-10-17 | 2022-10-17 | A double-break isolating switch |
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| CN115410858B true CN115410858B (en) | 2025-04-18 |
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| CN202211266075.5A Active CN115410858B (en) | 2022-10-17 | 2022-10-17 | A double-break isolating switch |
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| CN118942952B (en) * | 2024-10-15 | 2025-01-24 | 古桥电力科技有限公司 | A two-station double-break isolating switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783813A (en) * | 2021-12-23 | 2022-07-22 | 平高集团有限公司 | Double-break isolating switch |
| CN217562461U (en) * | 2022-06-27 | 2022-10-11 | 西安西电高压开关有限责任公司 | GIS is with two break isolator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106373821A (en) * | 2016-11-17 | 2017-02-01 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Double-break disconnector switch module |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783813A (en) * | 2021-12-23 | 2022-07-22 | 平高集团有限公司 | Double-break isolating switch |
| CN217562461U (en) * | 2022-06-27 | 2022-10-11 | 西安西电高压开关有限责任公司 | GIS is with two break isolator |
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