EP3956914A1 - Three-position switch - Google Patents

Three-position switch

Info

Publication number
EP3956914A1
EP3956914A1 EP20728005.8A EP20728005A EP3956914A1 EP 3956914 A1 EP3956914 A1 EP 3956914A1 EP 20728005 A EP20728005 A EP 20728005A EP 3956914 A1 EP3956914 A1 EP 3956914A1
Authority
EP
European Patent Office
Prior art keywords
connecting end
position switch
transmission
conductor
switch according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20728005.8A
Other languages
German (de)
French (fr)
Other versions
EP3956914C0 (en
EP3956914B1 (en
Inventor
Feng Zhi WANG
Sheng Min LIAO
Guo Zhu MENG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP3956914A1 publication Critical patent/EP3956914A1/en
Application granted granted Critical
Publication of EP3956914C0 publication Critical patent/EP3956914C0/en
Publication of EP3956914B1 publication Critical patent/EP3956914B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/54—Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts
    • H01H3/58—Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts using friction, toothed, or other mechanical clutch
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/42—Driving mechanisms
    • 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
    • H01H9/20—Interlocking, locking, or latching mechanisms
    • H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
    • H01H2009/265—Interlocking, locking, or latching mechanisms for interlocking two or more switches with interlocking of more than two switches

Definitions

  • the present invention relates to a three-position switch, and in particular to a three-position switch used for a high- voltage switch.
  • the high-voltage electric power equipment needs to be equipped with an isolating switch and a grounding switch.
  • the isolating switch and the grounding switch are separately provided with respective drive mechanisms to respectively operate, and the isolating switch and the grounding switch cannot be in a closed state at the same time according to the working principle. Therefore, two drive mechanisms must cooperate so as to be controlled by one control system.
  • the two switch devices, the two drive mechanisms and the one control system can realize normal working of the isolating switch and the grounding switch only through cooperation. Requirements on control stability and reliability are relatively high while the structure is complex.
  • a three-position switch is also provided in the prior art for controlling opening and closing as well as grounding of a high- voltage circuit in one phase.
  • high-voltage alternating current has three phases, three three-position switches are required as one group to simultaneously work, and respective drive mechanisms of the three three-position switches also need to cooperatively work simultaneously.
  • higher synchronization is required, and the space occupied by the three drive mechanisms is also larger.
  • the present invention aims to provide a three-position switch used for high-voltage electric power equipment.
  • the three- position switch is provided with three sub switches which correspond to three phases, each of the sub switches comprising a fixed connecting end used for connecting a conductor, and a first movable connecting end used for connecting the conductor and a second movable connecting end used for connecting a grounding line; wherein the first movable connecting end and the second movable connecting end can be simultaneously driven by one drive part to linearly move along respective axes of motion, and the second movable connecting end is not in contact with the grounding line while the first movable connecting end is separated from the conductor; the drive part is driven by a transmission shaft to rotate around the axis of the transmission shaft; and the three transmission shafts of the three sub switches are coaxially connected in an anti-torsion manner. Because of the connection of the transmission shafts, sub switches of three phases can be simultaneously operated by one drive mechanism, and therefore, the space occupied by the drive mechanism is reduced, and synchronization of
  • each of the sub switches is provided with an independent shielding shell, a transmission hole for the transmission shaft to pass through is formed in the shielding shell, two transmission shafts connecting two sides and two transmission holes are provided in the sub switch in the middle, and the transmission shafts of two adjacent sub switches are connected through a connecting part.
  • the connecting part comprises a hexagonal shaft and a hexagonal hole which match each other, and the hexagonal hole and the hexagonal shaft are respectively connected to the transmission shafts of the sub switches at the two sides through splines.
  • the hexagonal shaft and the hexagonal hole are respectively arranged on the transmission holes of the sub switches at the two sides through bearings, and are fixed and supported in an axial direction and a radial direction.
  • a drive shaft arranged in an opposite direction to the transmission shaft is provided on the sub switch which is not in the middle, and the drive shaft can be externally driven to rotate through a drive hole in the shielding shell.
  • the transmission shaft is made of an insulating material.
  • the fixed connecting end is fixedly connected to a basin-type insulator through a casting conductor, and the casting conductor is of a hollow columnar structure .
  • the casting conductor is provided with a first connecting end, a second connecting end and a body column; the first connecting end is fixedly connected to the fixed connecting end, and the second connecting end is fixedly connected to the basin-type insulator; the first connecting end is provided with a connecting ring for connecting the fixed connecting end; and the connecting ring is connected to the body column through connecting columns which are distributed at equal intervals.
  • a first bolt hole which is fixed to the fixed connecting end through a bolt, is formed in the connecting ring, and the position of the first bolt hole is staggered with the connecting column in a peripheral direction.
  • the second connecting end is a plane perpendicular to the geometrical axis of the body column; a second bolt hole, which is used for fixedly connecting the second connecting end to the basin-type insulator through a bolt, is formed in the second connecting end; and the position of the second bolt hole is staggered with the body column in a radial direction.
  • Fig. 1 is a front sectional view of a three-position switch of a specific embodiment of the present invention
  • Fig. 2 is a side sectional view of a sub switch of the above specific embodiment of the present invention.
  • Fig. 3 is a schematic structural diagram of a drive part of the above specific embodiment of the present invention.
  • Fig. 4 is a partial enlarged view of a connecting part of the three-position switch as shown in Fig. 1;
  • Fig. 5 is a schematic structural diagram of a casting conductor of the above specific embodiment of the present invention. Description of reference signs
  • Fig. 1 shows a three-position switch from the front, the three- position switch comprising three sub switches 11, 12, 13 which respectively correspond to three phases of a high-voltage line, wherein the three sub switches are arranged in a straight manner, and adjacent sub switches are connected through a transmission shaft 115 and a connecting part 118 in an anti- torsion manner; and the three sub switches are respectively provided with an independent shielding shell 116, and a transmission hole 117 for the transmission shaft 115 and the connecting part 118 to pass through is formed in the shielding shell 116.
  • a drive shaft 119 and a drive hole 120 are further provided in the sub switch 13 at the rightmost side in the direction shown in the figure, and the drive shaft 119 can be driven to rotate by one drive mechanism which is not shown in the figure, so that the three sub switches which are connected together are driven to synchronously operate.
  • Fig. 2 shows one sub switch in this embodiment from the side view, and the sub switch is provided with a fixed connecting end 111 for connecting a conductor and a first movable connecting end 112, and further comprises a second movable connecting end 113 for connecting a grounding line, wherein the fixed connecting end 111 and the second movable connecting end 113 are arranged in the form of a straight line, and the first movable connecting end 112 is perpendicular to the fixed connecting end 111 and the second movable connecting end 113.
  • the first movable connecting end 112 and the second movable connecting end 113 are connected on one drive part 114, and the drive part 114 simultaneously controls the first movable connecting end 112 and the second movable connecting end 113.
  • the three-position switch is in a switch-on position;
  • the drive part 114 rotates reversely, the first movable connecting end 112 moves towards the right side of the figure until it is separated from the conductor, the second movable connecting end 113 moves up in the figure and gradually gets close to the grounding line, and the second movable connecting end 113 is not in contact with the grounding line while the first movable connecting end 112 is just separated from the conductor, and at this time, the three- position switch is in an isolation position; and when the drive part continues to rotate until the second movable connecting end 113 comes into contact with the grounding line, the three- position switch is in a grounded position.
  • the drive part 114, the fixed connecting end 111, the first movable connecting end 112 and the second movable connecting end 113 are in the same plane, and the drive part 114 is driven to rotate by the transmission shaft 115 perpendicular to the plane .
  • Fig. 3 shows an optional embodiment of the drive part 114 which is a cam structure with splines, wherein the first movable connecting end 112 and the second movable connecting end 113 are connected to a bulged part of a cam through a connecting rod; and the cam is connected to the transmission shaft 115 (not shown in the figures) through the splines, and is driven to rotate.
  • the drive part 114 which is a cam structure with splines, wherein the first movable connecting end 112 and the second movable connecting end 113 are connected to a bulged part of a cam through a connecting rod; and the cam is connected to the transmission shaft 115 (not shown in the figures) through the splines, and is driven to rotate.
  • Both the first movable connecting end 112 and the second movable connecting end 113 are guided by an external structure such that same can only separately move in a transverse direction and a longitudinal direction shown in the figure; when the drive part 114 is driven clockwise by the transmission shaft in the direction shown in the figure, the first movable connecting end 112 is pushed to the left side of the figure by the connecting rod, and the second movable connecting end 113 is pulled to the below of the figure by the connecting rod; and when the drive part 114 is driven anticlockwise, the first and the second movable connecting ends also move reversely.
  • Those skilled in the art can also select other known linkage structures to realize the above functions according to practical application scenarios.
  • Fig. 4 shows the connecting part 118 between adjacent sub switches in this embodiment, wherein the connecting part 118 is provided with a hexagonal shaft 1181 and a hexagonal hole 1182 which match each other; and the hexagonal shaft 1181 and the hexagonal hole 1182 are provided with splines 1180 at the other ends, and are in anti-torsion cooperation with the transmission shafts 115 of the sub switches at two sides through the splines 1180, so that the transmission shafts 115 and the drive parts 114 of the three sub switches are connected to synchronously rotate.
  • the hexagonal shaft 1181 and the hexagonal hole 1182 are fixed and supported in the transmission holes 117 in respective shielding shells 116 through bearings.
  • a sealing structure is further arranged beside the bearing, and certainly those skilled in the art can also determine whether to use the sealing structure or not according to the application scenarios .
  • the drive shaft 119 and the drive hole 120 are also provided with structures which are the same as those of the transmission shaft 115 and the transmission hole 117, and the difference is that the hexagonal shaft connected through the splines on the drive shaft 119 is used to match the drive mechanism.
  • the transmission shaft 115 is made of an insulating material so as to improve the insulating property between adjacent sub switches, and therefore, an insulation distance between the sub switches can be shortened to reduce the overall space occupied by the three-position switch.
  • Fig. 5 shows a casting conductor 211 arranged between the fixed connecting end 111 and a basin-type insulator 20 in this embodiment, and the casting conductor 211 is of a hollow columnar structure, so that the weight is reduced, and the conductivity is also improved.
  • the casting conductor comprises a hollow cylindrical body column 214 and a first connecting end 212 and a second connecting end 213, which are positioned at two ends of the body column 214.
  • the first connecting end 212 is used to be fixedly connected to the fixed connecting end 111
  • the second fixed connecting end 213 is used to be fixedly connected to the basin-type insulator 20.
  • the length of the body column 214 is different according to different practical application scenarios.
  • the first connecting end 212 also comprises a connecting ring 2121, the connecting ring 2121 is connected to the body column 214 through connecting columns 2122, and the connecting columns 2122 are distributed at equal intervals in a peripheral direction; and first bolt holes 2123 are formed in the connecting ring 2121, and the connecting ring 2121 can be fixed to the fixed connecting end 111 through bolts.
  • the position of the first bolt holes is staggered with that of the connecting columns 2122 in the peripheral direction.
  • the second connecting end 213 is a plane perpendicular to the geometrical axis of the body column 214, and a second bolt hole is formed in the second connecting end, and is used for fixing the second connecting end to the basin-type insulator through a bolt.
  • the second bolt hole is staggered with a tube wall of the body column 214 in a radial position .

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

Disclosed is a three-position switch used for high-voltage electric power equipment. The three-position switch used for high-voltage electric power equipment is provided with three sub switches which correspond to three phases, wherein each of the sub switches comprises a fixed connecting end used for connecting a conductor, and a first movable connecting end used for connecting the conductor and a second movable connecting end used for connecting a grounding line; the first movable connecting end and the second movable connecting end can be simultaneously driven by one drive part to linearly move along respective axes of motion; and the drive part is driven by a transmission shaft, and the three transmission shafts of the three sub switches are coaxially connected in an anti-torsion manner. Because of the connection of the transmission shafts, sub switches of three phases can be simultaneously operated by one drive mechanism, and therefore, the space occupied by the drive mechanism is reduced, and synchronization of operation is also guaranteed.

Description

Description
Three-position switch
Technical Field
The present invention relates to a three-position switch, and in particular to a three-position switch used for a high- voltage switch.
Background Art
In a power system, due to a high working voltage, if work such as repair and maintenance is performed on the equipment, the equipment needs to be disconnected from a high-voltage power grid and also needs to be grounded, so that the safety of an operator and the equipment itself is guaranteed. Therefore, the high-voltage electric power equipment needs to be equipped with an isolating switch and a grounding switch.
In the high-voltage electric power equipment in the prior art, the isolating switch and the grounding switch are separately provided with respective drive mechanisms to respectively operate, and the isolating switch and the grounding switch cannot be in a closed state at the same time according to the working principle. Therefore, two drive mechanisms must cooperate so as to be controlled by one control system. Thus, the two switch devices, the two drive mechanisms and the one control system can realize normal working of the isolating switch and the grounding switch only through cooperation. Requirements on control stability and reliability are relatively high while the structure is complex.
A three-position switch is also provided in the prior art for controlling opening and closing as well as grounding of a high- voltage circuit in one phase. As high-voltage alternating current has three phases, three three-position switches are required as one group to simultaneously work, and respective drive mechanisms of the three three-position switches also need to cooperatively work simultaneously. For the control system, higher synchronization is required, and the space occupied by the three drive mechanisms is also larger.
Summary of the Invention
The present invention aims to provide a three-position switch used for high-voltage electric power equipment. The three- position switch is provided with three sub switches which correspond to three phases, each of the sub switches comprising a fixed connecting end used for connecting a conductor, and a first movable connecting end used for connecting the conductor and a second movable connecting end used for connecting a grounding line; wherein the first movable connecting end and the second movable connecting end can be simultaneously driven by one drive part to linearly move along respective axes of motion, and the second movable connecting end is not in contact with the grounding line while the first movable connecting end is separated from the conductor; the drive part is driven by a transmission shaft to rotate around the axis of the transmission shaft; and the three transmission shafts of the three sub switches are coaxially connected in an anti-torsion manner. Because of the connection of the transmission shafts, sub switches of three phases can be simultaneously operated by one drive mechanism, and therefore, the space occupied by the drive mechanism is reduced, and synchronization of operation is also guaranteed.
According to another aspect of the three-position switch of the present invention, each of the sub switches is provided with an independent shielding shell, a transmission hole for the transmission shaft to pass through is formed in the shielding shell, two transmission shafts connecting two sides and two transmission holes are provided in the sub switch in the middle, and the transmission shafts of two adjacent sub switches are connected through a connecting part.
According to another aspect of the three-position switch of the present invention, the connecting part comprises a hexagonal shaft and a hexagonal hole which match each other, and the hexagonal hole and the hexagonal shaft are respectively connected to the transmission shafts of the sub switches at the two sides through splines.
According to another aspect of the three-position switch of the present invention, the hexagonal shaft and the hexagonal hole are respectively arranged on the transmission holes of the sub switches at the two sides through bearings, and are fixed and supported in an axial direction and a radial direction.
According to another aspect of the three-position switch of the present invention, a drive shaft arranged in an opposite direction to the transmission shaft is provided on the sub switch which is not in the middle, and the drive shaft can be externally driven to rotate through a drive hole in the shielding shell.
According to another aspect of the three-position switch of the present invention, the transmission shaft is made of an insulating material.
According to another aspect of the three-position switch of the present invention, the fixed connecting end is fixedly connected to a basin-type insulator through a casting conductor, and the casting conductor is of a hollow columnar structure .
According to another aspect of the three-position switch of the present invention, the casting conductor is provided with a first connecting end, a second connecting end and a body column; the first connecting end is fixedly connected to the fixed connecting end, and the second connecting end is fixedly connected to the basin-type insulator; the first connecting end is provided with a connecting ring for connecting the fixed connecting end; and the connecting ring is connected to the body column through connecting columns which are distributed at equal intervals.
According to another aspect of the three-position switch of the present invention, a first bolt hole, which is fixed to the fixed connecting end through a bolt, is formed in the connecting ring, and the position of the first bolt hole is staggered with the connecting column in a peripheral direction. According to another aspect of the three-position switch of the present invention, the second connecting end is a plane perpendicular to the geometrical axis of the body column; a second bolt hole, which is used for fixedly connecting the second connecting end to the basin-type insulator through a bolt, is formed in the second connecting end; and the position of the second bolt hole is staggered with the body column in a radial direction.
Brief Description of the Drawings
Fig. 1 is a front sectional view of a three-position switch of a specific embodiment of the present invention;
Fig. 2 is a side sectional view of a sub switch of the above specific embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a drive part of the above specific embodiment of the present invention;
Fig. 4 is a partial enlarged view of a connecting part of the three-position switch as shown in Fig. 1; and
Fig. 5 is a schematic structural diagram of a casting conductor of the above specific embodiment of the present invention. Description of reference signs
11, 12, 13 Sub switch
111 Fixed connecting end
112 First movable connecting end
113 Second movable connecting end
114 Drive part
115 Transmission shaft
116 Shielding shell
117 Transmission hole
118 Connecting part
1180 Spline
1181 Hexagonal shaft
1182 Hexagonal hole
119 Drive shaft
120 Drive hole
20 Basin-type insulator
211 Casting conductor
212 First connecting end
2121 Connecting ring
2122 Connecting column
2123 First bolt hole
213 Second connecting end
214 Body column
Detailed Description of Embodiments
Particular embodiments of the present invention are described below in conjunction with the accompanying drawings.
Fig. 1 shows a three-position switch from the front, the three- position switch comprising three sub switches 11, 12, 13 which respectively correspond to three phases of a high-voltage line, wherein the three sub switches are arranged in a straight manner, and adjacent sub switches are connected through a transmission shaft 115 and a connecting part 118 in an anti- torsion manner; and the three sub switches are respectively provided with an independent shielding shell 116, and a transmission hole 117 for the transmission shaft 115 and the connecting part 118 to pass through is formed in the shielding shell 116. A drive shaft 119 and a drive hole 120 are further provided in the sub switch 13 at the rightmost side in the direction shown in the figure, and the drive shaft 119 can be driven to rotate by one drive mechanism which is not shown in the figure, so that the three sub switches which are connected together are driven to synchronously operate.
Fig. 2 shows one sub switch in this embodiment from the side view, and the sub switch is provided with a fixed connecting end 111 for connecting a conductor and a first movable connecting end 112, and further comprises a second movable connecting end 113 for connecting a grounding line, wherein the fixed connecting end 111 and the second movable connecting end 113 are arranged in the form of a straight line, and the first movable connecting end 112 is perpendicular to the fixed connecting end 111 and the second movable connecting end 113. The first movable connecting end 112 and the second movable connecting end 113 are connected on one drive part 114, and the drive part 114 simultaneously controls the first movable connecting end 112 and the second movable connecting end 113. When the drive part 114 rotates clockwise when viewed from the direction shown in the figure, the second movable connecting end 113 moves down in the figure and gradually moves away from the grounding line, and the first movable connecting end 112 moves towards the left side of the figure and gradually gets close to the conductor until it comes into contact with the conductor, and at this time, the three-position switch is in a switch-on position; when the drive part 114 rotates reversely, the first movable connecting end 112 moves towards the right side of the figure until it is separated from the conductor, the second movable connecting end 113 moves up in the figure and gradually gets close to the grounding line, and the second movable connecting end 113 is not in contact with the grounding line while the first movable connecting end 112 is just separated from the conductor, and at this time, the three- position switch is in an isolation position; and when the drive part continues to rotate until the second movable connecting end 113 comes into contact with the grounding line, the three- position switch is in a grounded position. In this embodiment, the drive part 114, the fixed connecting end 111, the first movable connecting end 112 and the second movable connecting end 113 are in the same plane, and the drive part 114 is driven to rotate by the transmission shaft 115 perpendicular to the plane .
Fig. 3 shows an optional embodiment of the drive part 114 which is a cam structure with splines, wherein the first movable connecting end 112 and the second movable connecting end 113 are connected to a bulged part of a cam through a connecting rod; and the cam is connected to the transmission shaft 115 (not shown in the figures) through the splines, and is driven to rotate. Both the first movable connecting end 112 and the second movable connecting end 113 are guided by an external structure such that same can only separately move in a transverse direction and a longitudinal direction shown in the figure; when the drive part 114 is driven clockwise by the transmission shaft in the direction shown in the figure, the first movable connecting end 112 is pushed to the left side of the figure by the connecting rod, and the second movable connecting end 113 is pulled to the below of the figure by the connecting rod; and when the drive part 114 is driven anticlockwise, the first and the second movable connecting ends also move reversely. Those skilled in the art can also select other known linkage structures to realize the above functions according to practical application scenarios.
Fig. 4 shows the connecting part 118 between adjacent sub switches in this embodiment, wherein the connecting part 118 is provided with a hexagonal shaft 1181 and a hexagonal hole 1182 which match each other; and the hexagonal shaft 1181 and the hexagonal hole 1182 are provided with splines 1180 at the other ends, and are in anti-torsion cooperation with the transmission shafts 115 of the sub switches at two sides through the splines 1180, so that the transmission shafts 115 and the drive parts 114 of the three sub switches are connected to synchronously rotate. The hexagonal shaft 1181 and the hexagonal hole 1182 are fixed and supported in the transmission holes 117 in respective shielding shells 116 through bearings. A sealing structure is further arranged beside the bearing, and certainly those skilled in the art can also determine whether to use the sealing structure or not according to the application scenarios .
It has not been shown in the figure that the drive shaft 119 and the drive hole 120 are also provided with structures which are the same as those of the transmission shaft 115 and the transmission hole 117, and the difference is that the hexagonal shaft connected through the splines on the drive shaft 119 is used to match the drive mechanism.
In this embodiment, the transmission shaft 115 is made of an insulating material so as to improve the insulating property between adjacent sub switches, and therefore, an insulation distance between the sub switches can be shortened to reduce the overall space occupied by the three-position switch.
Fig. 5 shows a casting conductor 211 arranged between the fixed connecting end 111 and a basin-type insulator 20 in this embodiment, and the casting conductor 211 is of a hollow columnar structure, so that the weight is reduced, and the conductivity is also improved. The casting conductor comprises a hollow cylindrical body column 214 and a first connecting end 212 and a second connecting end 213, which are positioned at two ends of the body column 214. The first connecting end 212 is used to be fixedly connected to the fixed connecting end 111, and the second fixed connecting end 213 is used to be fixedly connected to the basin-type insulator 20. The length of the body column 214 is different according to different practical application scenarios. The first connecting end 212 also comprises a connecting ring 2121, the connecting ring 2121 is connected to the body column 214 through connecting columns 2122, and the connecting columns 2122 are distributed at equal intervals in a peripheral direction; and first bolt holes 2123 are formed in the connecting ring 2121, and the connecting ring 2121 can be fixed to the fixed connecting end 111 through bolts. In order to conveniently operate the bolts, the position of the first bolt holes is staggered with that of the connecting columns 2122 in the peripheral direction. The second connecting end 213 is a plane perpendicular to the geometrical axis of the body column 214, and a second bolt hole is formed in the second connecting end, and is used for fixing the second connecting end to the basin-type insulator through a bolt. In order to conveniently operate the bolt, the second bolt hole is staggered with a tube wall of the body column 214 in a radial position .
Although the content of the present invention has been described in detail by means of the above preferred embodiments, it should be appreciated that the above description should not be construed as limiting the present invention. Various modifications and replacements of the present invention will be apparent to those skilled in the art upon reading the above content. Therefore, the scope of protection of the present invention shall be limited by the appended claims. In addition, any reference sign in the claims should not be construed as limiting the claims involved. The term "comprise" does not exclude other apparatuses or steps not listed in the claims or the specification. The terms "first", "second", etc., are only used to refer to names, and do not denote any particular order. Herein, "parallel", "perpendicular", etc., are not strictly limited in the mathematical and/or geometrical sense, and further include errors that can be understood by those skilled in the art and are allowable during manufacture or use.

Claims

Claims
1. A three-position switch used for high-voltage electric power equipment, having three sub switches (11, 12, 13) which correspond to three phases, each of the sub switches comprising :
a fixed connecting end (111) used for connecting a conductor, and
a first movable connecting end (112) used for connecting the conductor and a second movable connecting end (113) used for connecting a grounding line;
wherein the first movable connecting end (112) and the second movable connecting end (113) can be simultaneously driven by one drive part (114) to linearly move along respective axes of motion, and the second movable connecting end (113) is not in contact with the grounding line while the first movable connecting end (112) is separated from the conductor;
the drive part (114) is driven by a transmission shaft (115) to rotate around the axis of the transmission shaft (115) ; and the transmission shafts (115) of the three sub switches (11, 12, 13) are coaxially connected in an anti-torsion manner.
2. The three-position switch according to claim 1, wherein each of the sub switches is provided with an independent shielding shell (116) , a transmission hole (117) for the transmission shaft (115) to pass through is formed in the shielding shell (116) , two transmission shafts (115) connecting two sides and two transmission holes (117) are provided in the sub switch (12) in the middle, and the transmission shafts (115) of two adjacent sub switches are connected through a connecting part (118) .
3. The three-position switch according to claim 2, wherein the connecting part (118) comprises a hexagonal shaft (1181) and a hexagonal hole (1182) which match each other, and the hexagonal hole (1182) and the hexagonal shaft (1181) are respectively connected to the transmission shafts (115) of the sub switches at the two sides through splines (1180) .
4. The three-position switch according to claim 3, wherein the hexagonal shaft (1181) and the hexagonal hole (1182) are respectively arranged on the transmission holes (117) of the sub switches at the two sides through bearings, and are fixed and supported in an axial direction and a radial direction.
5. The three-position switch according to any one of claims 2 to 4, wherein a drive shaft (119) arranged in an opposite direction to the transmission shaft (115) is provided on the sub switch (13) which is not in the middle, and the drive shaft
(119) can be externally driven to rotate through a drive hole
(120) in the shielding shell (116) .
6. The three-position switch according to any one of claims 2 to 4, wherein the transmission shaft (115) is made of an insulating material.
7. The three-position switch according to claim 1, wherein the fixed connecting end (111) is fixedly connected to a basin- type insulator (20) through a casting conductor (211) , and the casting conductor (211) is of a hollow columnar structure.
8. The three-position switch according to claim 7, wherein the casting conductor (211) is provided with a first connecting end (212) , a second connecting end (213) and a body column (214); the first connecting end (212) is fixedly connected to the fixed connecting end (111) , and the second connecting end
(213) is fixedly connected to the basin-type insulator (20) ; the first connecting end (212) is provided with a connecting ring (2121) for connecting the fixed connecting end (111) ; and the connecting ring (2121) is connected to the body column
(214) through connecting columns (2122) which are distributed at equal intervals.
9. The three-position switch according to claim 8, wherein a first bolt hole (2123) , which is fixed to the fixed connecting end (111) through a bolt, is formed in the connecting ring (2121) , and the position of the first bolt hole (2123) is staggered with the connecting column (2122) in a peripheral direction .
10. The three-position switch according to claim 8, wherein the second connecting end (213) is a planar structure perpendicular to the geometrical axis of the body column (214) ; a second bolt hole, which is used for fixedly connecting the second connecting end to the basin-type insulator (20) through a bolt, is formed in the second connecting end (213) ; and the position of the second bolt hole is staggered with the body column (214) in a radial direction.
EP20728005.8A 2019-05-22 2020-05-22 Three-position switch Active EP3956914B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201920745988.2U CN209658067U (en) 2019-05-22 2019-05-22 Three-station
PCT/EP2020/064301 WO2020234463A1 (en) 2019-05-22 2020-05-22 Three-position switch

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US2954449A (en) * 1958-09-25 1960-09-27 S & C Electric Co Switch construction
KR101250261B1 (en) * 2011-12-20 2013-04-04 엘에스산전 주식회사 Arc extinguishing apparatus for ring main unit
JP2017134885A (en) * 2014-06-12 2017-08-03 三菱電機株式会社 Gas insulated switchgear switch and gas insulated switchgear
CN105551849B (en) * 2016-01-20 2018-08-17 博纳方格（天津）电气设备有限公司 Every connecing stacked switch

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WO2020234463A1 (en) 2020-11-26
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