CN104269286B - A kind of three position operation mechanisms - Google Patents
A kind of three position operation mechanisms Download PDFInfo
- Publication number
- CN104269286B CN104269286B CN201410498043.7A CN201410498043A CN104269286B CN 104269286 B CN104269286 B CN 104269286B CN 201410498043 A CN201410498043 A CN 201410498043A CN 104269286 B CN104269286 B CN 104269286B
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- China
- Prior art keywords
- switch
- connecting rod
- screw
- auxiliary
- operating mechanism
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- 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.)
- Expired - Fee Related
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Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
-
- 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
- H01H3/40—Driving mechanisms, i.e. for transmitting driving force to the contacts using friction, toothed, or screw-and-nut gearing
-
- 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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- Transmission Devices (AREA)
Abstract
The invention discloses a kind of three position operation mechanisms, for high-tension switch gear, disconnecting switch and the combined three position switch of earthed switch is driven to complete combined floodgate, separating brake and ground connection operation, described operating mechanism specifically comprises and is symmetrically arranged between upper mounting plate (13) and lower installation board (14): two motor (8), two screw mandrels (10), two feed screw nuts (3), two auxiliary connecting rod (1), two auxiliary switches (6), two position indicators (9)；Wherein, feed screw nut's pin (2) is connected in kinematic link chute (b) of kinematic link (5) end, and promotes kinematic link (5) to move.After this invention takes such scheme, it is corresponding with the three of three position switch operating functions.Both it had been provided that enough driving forces made contact move, and contact can be maintained at again set operating position, be reliably achieved each function of switch.
Description
Technical Field
The present invention pertains to a three-position operating mechanism for driving a combined isolator and earthing switch (i.e., a three-position switch) of a high-voltage power system.
Background
Isolating switches and grounding switches in power systems are very common elements used to implement isolating and grounding functions of live circuits. With the increase of integration of power system components, a new combination type of disconnecting switch and grounding switch (i.e., a three-position switch) has appeared.
The three-position switch integrates the isolating switch and the grounding switch into a switch unit, and integrates the closing operation of the isolating switch, the closing operation of the grounding switch and the shared opening operation.
The novel three-position switch needs a matched three-position operating mechanism to drive the contact unit, and the specific connection is schematically shown in figure 4.
Such an operating mechanism is required to have three reliable operating positions, corresponding to the three operating functions of the three-position switch. The contact can be kept at the set operation position while providing enough driving force to move the contact, and various functions of the switch can be reliably realized.
Disclosure of Invention
The invention aims to provide a three-position operating mechanism.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a three-position operating mechanism is used for high-voltage switch equipment and drives a combined three-position switch of an isolating switch and a grounding switch to complete switching-on, switching-off and grounding operations, and the operating mechanism specifically comprises: the device comprises two motors (8), two screw rods (10), two screw rod nuts (3), two auxiliary connecting rods (1), two auxiliary switches (6) and two position indicators (9); wherein, a screw nut pin (2) is connected in a transmission connecting rod sliding groove (b) at the end part of the transmission connecting rod (5) and pushes the transmission connecting rod (5) to move, and an output pin (4) at the middle part of the transmission connecting rod (5) slides back and forth along a lower mounting plate sliding groove (c) on the lower mounting plate and an upper mounting plate sliding groove (d) on the upper mounting plate and drives a contact of the three-position switch to move outwards; the screw-nut pin (2) is connected in the auxiliary connecting rod sliding groove (a) at the end part of the auxiliary connecting rod (1), the screw-nut pin (2) enables the auxiliary connecting rod (1) to rotate through the auxiliary connecting rod sliding groove (a) on the auxiliary connecting rod, and drives the auxiliary switch transmission device (7) to rotate, the rotating shaft of the auxiliary connecting rod (1) is mutually vertical to the rotating shaft of an auxiliary switch (6) and a position indicator (9), and the rotating shaft of the auxiliary switch (6) and the rotating shaft of the position indicator (9) are driven to rotate.
Preferably, the motor (8) is further connected with a motor transmission device (11), the lead screw (10) is driven to rotate through the motor transmission device (11), and the lead screw (10) pushes the lead screw nut (3) to move back and forth along the sliding groove (c) of the lower mounting plate and the sliding groove (d) of the upper mounting plate.
The preferable structure is that the mounting plate chute (d) on the upper mounting plate and the mounting plate chute (c) under the upper mounting plate respectively comprise three chutes which are parallel to each other and aligned up and down, the centers of the chutes on two sides are aligned with the axis of the screw rod (10) respectively, and the output pin moves along the chute in the middle.
Preferably, the screw (10) is a common ball screw, a T-shaped screw or a common screw.
Preferably, the output pin (4) directly drives a contact of a translational motion three-position switch;
or the rotating torque is output through the transmission of the rack and the gear to drive a contact of the three-position switch; or the swing rod is pushed to rotate, and the rotating shaft of the swing rod outputs rotating torque to the outside to drive the contact of the three-position switch.
Preferably, a protective clutch device (12) is mounted in the motor transmission device (11), and the motor (8) idles after the set torque is exceeded.
Preferably, the motor transmission device (11) is an auxiliary switch transmission device which adopts two bevel gears meshed together to realize transmission, and the transmission ratio is 3: 1 to 1: 3, or less.
Preferably, the bevel gear is straight bevel gear or spiral bevel gear.
Preferably, the motor transmission device (11) is an auxiliary switch transmission device which adopts a transmission connecting rod with a spherical joint to complete transmission, and the angular transmission ratio is 3: 1 to 1: 3, or less.
After the scheme is adopted, the three-position switch corresponds to three operation functions of the three-position switch. The contact can be kept at the set operation position while providing enough driving force to move the contact, and various functions of the switch can be reliably realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings so that the above advantages of the present invention will be more apparent. Wherein,
FIG. 1 is a schematic diagram of a three-position actuator according to an embodiment of the present invention, which comprises a middle driving module, two auxiliary switches and two position indicators;
FIG. 2 is a view of the internal structure of the operating mechanism with the upper mounting plate removed, and the internal structure of the drive module can be seen with the upper mounting plate removed;
fig. 3 is a structural view of the internal structure of the opening position operating mechanism of the present invention, and with respect to the opening position of fig. 1 and 2, in fig. 3, the left lead screw nut moves to the front side, and at this time, the operating mechanism corresponds to the closing position, specifically, the closing position of the disconnecting switch or the grounding switch is related to the relative arrangement of the operating mechanism and the three-position switch;
fig. 4 is a schematic diagram of a prior art three-position switch and its operating mechanism, where the switching between the three positions of the operating mechanism drives the switching between the three positions of the switch in a one-to-one correspondence.
The names of the components and parts in the figures are as follows:
1 auxiliary connecting rod, 2 screw-nut pin, 3 screw-nut, 4 output pin, 5 transmission connecting rod, 6 auxiliary switch, 7 auxiliary switch transmission device, 8 motor, 9 position indicator, 10 screw, 11 motor transmission device, 12 clutch device, 13 upper mounting plate, 14 lower mounting plate, a auxiliary connecting rod chute, b transmission connecting rod chute, c lower mounting plate chute, d upper mounting plate chute
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Aiming at the operation functions mentioned in the background technology, the invention provides a simple and low-cost solution, which reliably drives the contact of the three-position switch to complete three functions of isolation switch-on, switch-off and grounding switch-on.
Specifically, a three-position operating mechanism is used for high-voltage switch equipment, and drives a three-position switch combined by an isolating switch and a grounding switch to complete switching-on, switching-off and grounding operations, and the operating mechanism specifically comprises: the two motors 8, the two screw rods 10, the two screw rod nuts 3, the two auxiliary connecting rods 1, the two auxiliary switches 6 and the two position indicators 9; wherein, a screw nut pin 2 is connected in a transmission connecting rod chute b at the end part of the transmission connecting rod 5 and pushes the transmission connecting rod 5 to move, and an output pin 4 at the middle part of the transmission connecting rod 5 slides back and forth along a lower mounting plate chute c on the lower mounting plate and an upper mounting plate chute d on the upper mounting plate and drives a contact of the three-position switch to move outwards; the screw-nut pin 2 is connected in the auxiliary connecting rod chute a at the end part of the auxiliary connecting rod 1, the screw-nut pin 2 enables the auxiliary connecting rod 1 to rotate through the auxiliary connecting rod chute a on the auxiliary connecting rod and drives the auxiliary switch transmission device 7 to rotate, and the rotating shaft of the auxiliary connecting rod 1 is vertical to the rotating shafts of an auxiliary switch 6 and a position indicator 9 and drives the rotating shafts of the auxiliary switch 6 and the position indicator 9 to rotate.
Preferably, the motor 8 is further connected with a motor transmission device 11, the lead screw 10 is driven to rotate by the motor transmission device 11, and the lead screw 10 pushes the lead screw nut 3 to move back and forth along the sliding groove c of the lower mounting plate and the sliding groove d of the upper mounting plate.
The preferable structure is that the mounting plate chute d on the upper mounting plate and the mounting plate chute c under the upper mounting plate respectively comprise three chutes which are parallel to each other and aligned up and down, the centers of the chutes on two sides are aligned with the axis of the screw rod 10 respectively, and the output pin moves along the chute in the middle.
Preferably, the screw 10 is a common ball screw, a T-screw or a common screw.
Preferably, the output pin 4 directly drives a contact of a translational motion three-position switch;
or the rotating torque is output through the transmission of the rack and the gear to drive a contact of the three-position switch; or the swing rod is pushed to rotate, and the rotating shaft of the swing rod outputs rotating torque to the outside to drive the contact of the three-position switch.
Preferably, a clutch device 12 for protection is installed in the motor transmission device 11, and the motor 8 idles after a set torque is exceeded.
Preferably, the motor transmission device 11 is an auxiliary switch transmission device which adopts two bevel gears meshed together to realize transmission, and the transmission ratio is 3: 1 to 1: 3, or less.
Preferably, the bevel gear is straight bevel gear or spiral bevel gear.
Preferably, the motor transmission device 11 is an auxiliary switch transmission device, the auxiliary switch transmission device adopts a transmission connecting rod with a spherical joint to complete transmission, and the angular transmission ratio is 3: 1 to 1: 3, or less.
After the scheme is adopted, the three-position switch corresponds to three operation functions of the three-position switch. The contact can be kept at the set operation position while providing enough driving force to move the contact, and various functions of the switch can be reliably realized.
Furthermore, in the invention, three positions of the operating mechanism drive the screw rod nuts 3 to move by the motor 8, so that the transmission connecting rod 5 connected with the screw rod nuts 3 moves, when two screw rod nuts 3 are positioned at the rear side, the operating mechanism outputs the closing position of the disconnecting switch, when one screw rod nut is positioned at the front side, the operating mechanism outputs the opening position when the other screw rod nut is positioned at the rear side, and when the other screw rod nut is positioned at the front side, the operating mechanism outputs the grounding closing position; the switching between the positions is realized by the positive and negative rotation of the motor 8, and after the screw rod nut 3 moves to the specified position, the micro switch is triggered to cut off the power supply of the motor 8, so that the automatic stop is realized. The screw nut 3 drives the auxiliary switch 6 and the position indicator 9 at the same time, displays the working position of the mechanism on the operating mechanism, and outputs a position signal of the switch to the outside.
In fig. 1, the overall structure of the operating mechanism is shown in detail, and the structure of an embodiment of the operating mechanism is described in detail, and the operating mechanism is composed of a middle driving module, two auxiliary switches 6 at two sides and a position indicator 9. In order to more clearly illustrate the internal structure and principle of the actuator of the present invention, the internal structure of the actuator of the present invention is clearly shown as shown in fig. 2, with the upper mounting plate 13 of fig. 1 removed.
The operating mechanism comprises a driving module in the middle and two auxiliary modules at two sides. The driving module has the functions that the motor 8 drives the transmission system to finally output driving force to the outside through the output pin 4, and the auxiliary module correctly indicates the position of the operating mechanism and outputs an electric signal of the position to the outside and directly displays the position for an observer. In fig. 2, two lead screw nuts 3 are arranged on the rear side, and the operating mechanism outputs the closing position of the disconnecting switch. In fig. 3, the left lead screw nut 3 is located on the front side and the right lead screw nut 3 is located on the rear side, and the operating mechanism outputs the opening position.
The movement of the operating mechanism from the on position of the disconnector in fig. 2 to the off position in fig. 3 will now be described in detail.
The whole operation mechanism acts in such a way that the left motor 8 is electrified to start running, the left lead screw 10 is driven to rotate by the clutch device 12 contained in the motor transmission mechanism 11, the lead screw nut pin 2 on the lead screw nut 3 is positioned in the chutes c and d of the upper and lower mounting plates 13 and 14, so that the lead screw nut 3 cannot rotate and can only move along the chutes of the upper and lower mounting plates, the lead screw nut pin 2 directly pushes the transmission connecting rod chute b, so that the transmission connecting rod 5 moves, the lead screw nut pin 2 in the chute on the right side of the transmission connecting rod 5 cannot move at a fixed position and becomes a rotating shaft, the output pin 4 also moves forwards along the chute in the middle of the upper and lower mounting plates while the left lead screw nut 3 moves towards the front side of the mechanism, until the output pin 4 moves to a set position, the left lead screw nut 3 triggers the microswitch to, and completing the opening operation.
In the process of the brake separating operation, the screw nut pin 2 drives the transmission connecting rod 5 to move and simultaneously presses the inner wall of the auxiliary connecting rod chute a to push the auxiliary connecting rod 5 to rotate, the auxiliary switch transmission device 7 is driven on the rotating shaft of the auxiliary connecting rod 5 to transmit, and the output shaft of the auxiliary switch transmission device drives the rotating shafts of the auxiliary switch 6 and the position indicator 9 to rotate. In order to achieve the above function, the two rotating shafts of the auxiliary switch transmission device 7 are designed to be perpendicular to each other, so as to save space and convert the transfer of the lead screw nut 3 into the rotation of the rotating shaft of the auxiliary switch 5.
In order to realize the operation function, three linear sliding grooves are arranged at the corresponding positions of the upper mounting plate 13 and the lower mounting plate 14, the sliding grooves at the two sides accommodate the screw nut pin 2 to slide, and the sliding groove in the middle accommodates the output pin 4 to slide. The advantage that all sets up the spout at last lower mounting panel can avoid lead screw nut pin 2 and output pin 4 to receive the effect of eccentric force, avoids lead screw 10 to receive the yawing force, protects lead screw 10. Meanwhile, the centers of the sliding grooves on the two sides are consistent with the center of the screw rod 10, so that the screw rod nut 3 is ensured to slide smoothly.
In the operating mechanism of the present invention, the screw 10 is an important component, and functions to convert the rotation of the motor 8 into the linear sliding, and high transmission efficiency and reliable structure are required. The ball screw is a screw with high transmission efficiency, allows large axial output thrust and can well meet the requirements of the operating mechanism. In order to further reduce the cost, when the output force is small, a T-shaped thread screw or a common coarse thread screw can be selected in the operating mechanism, and the transmission efficiency of the two screws is lower than that of a ball screw.
In the operating mechanism, the output pin 4 can directly drive the contact of the translational motion three-position switch, can also drive the contact of the translational motion three-position switch by outputting a rotating torque through the transmission of a rack and a gear, and can also push the oscillating bar to rotate and enable the rotating shaft of the oscillating bar to externally output the rotating torque to drive the contact of the translational motion three-position switch. Among the three output driving modes, the output pin directly drives the three-position switch contact is simplest and has the highest efficiency, but the output pin is only suitable for a switch which can be linearly driven by the three-position switch contact and is rarely adopted in practical use; similarly, the third type pushes the swing link to drive the three-position switch, and the transmission angle is smaller than 90 degrees, so that the practical use is limited; the second driving mode is a common driving mode, in which the driving rack drives the gear to rotate and output, so that the output angle can be conveniently adjusted, even the output angle is more than 360 degrees, and the driving mode is easily matched with the requirement of the movement of the three-position switch contact.
In the operating mechanism of the invention, a motor transmission device 11 is arranged between a motor 8 and a screw rod 10, in order to avoid overload of the motor 8 or damage of the screw rod 10 caused by the output torque of the motor exceeding a rated value, a clutch device 12 with a protection function is arranged in the motor transmission device 11, and the motor 8 idles after the set torque is exceeded;
in the operating mechanism of the present invention, the auxiliary switch transmission device 11 generally adopts two bevel gears meshed together to realize transmission, and the transmission ratio is generally 3: 1 to 1: 3, straight bevel teeth or arc bevel teeth can be adopted; the auxiliary switch transmission 11 can also adopt a transmission link with a spherical joint to complete transmission according to requirements, and the angular transmission ratio is still in the range of the transmission ratio.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A three-position operating mechanism is used for high-voltage switch equipment and drives a combined three-position switch of an isolating switch and a grounding switch to complete switching-on, switching-off and grounding operations, and is characterized by specifically comprising: the device comprises two motors (8), two screw rods (10), two screw rod nuts (3), two auxiliary connecting rods (1), two auxiliary switches (6) and two position indicators (9); wherein, a screw nut pin (2) is connected in a transmission connecting rod sliding groove (b) at the end part of the transmission connecting rod (5) and pushes the transmission connecting rod (5) to move, and an output pin (4) at the middle part of the transmission connecting rod (5) slides back and forth along a lower mounting plate sliding groove (c) on the lower mounting plate and an upper mounting plate sliding groove (d) on the upper mounting plate and drives a contact of the three-position switch to move outwards; the screw-nut pin (2) is connected in the auxiliary connecting rod sliding groove (a) at the end part of the auxiliary connecting rod (1), the screw-nut pin (2) enables the auxiliary connecting rod (1) to rotate through the auxiliary connecting rod sliding groove (a) on the auxiliary connecting rod, and drives the auxiliary switch transmission device (7) to rotate, the rotating shaft of the auxiliary connecting rod (1) is mutually vertical to the rotating shaft of an auxiliary switch (6) and a position indicator (9), and the rotating shaft of the auxiliary switch (6) and the rotating shaft of the position indicator (9) are driven to rotate.
2. The three-position operating mechanism according to claim 1, wherein the motor (8) is further connected with a motor transmission device (11), the motor transmission device (11) drives the lead screw (10) to rotate, and the lead screw (10) pushes the lead screw nut (3) to move back and forth along the lower mounting plate sliding groove (c) and the upper mounting plate sliding groove (d).
3. The three-position operating mechanism according to claim 1 or 2, wherein the upper mounting plate runner (d) and the lower mounting plate runner (c) respectively comprise three runners which are parallel to each other and aligned up and down, and the center of the runners on both sides is aligned with the axis of the screw (10) respectively, and the output pin moves along the middle runner.
4. Three-position operating mechanism according to claim 1 or 2, characterized in that the screw (10) is a plain ball screw, a T-thread screw or a plain thread screw.
5. The three-position operating mechanism according to claim 1 or 2, characterized in that the output pin (4) directly drives the contacts of a translatory movement three-position switch;
or the rotating torque is output through the transmission of the rack and the gear to drive a contact of the three-position switch; or the swing rod is pushed to rotate, and the rotating shaft of the swing rod outputs rotating torque to the outside to drive the contact of the three-position switch.
6. Three-position operating mechanism according to claim 2, characterized in that a protective clutch device (12) is mounted in the motor drive (11), which motor (8) will freewheel after a set torque has been exceeded.
7. The three-position operating mechanism according to claim 6, wherein the motor drive (11) is an auxiliary switch drive which uses two bevel gears meshing together to achieve the drive, and the transmission ratio is 3: 1 to 1: 3, or less.
8. The three position operating mechanism of claim 7 wherein said bevel gears are straight bevel or spiral bevel gears.
9. The three-position operating mechanism according to claim 6, wherein the motor drive (11) is selected from an auxiliary switch drive which uses a drive link with a ball joint to perform the drive, and the angular transmission ratio is 3: 1 to 1: 3, or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410498043.7A CN104269286B (en) | 2014-09-26 | 2014-09-26 | A kind of three position operation mechanisms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410498043.7A CN104269286B (en) | 2014-09-26 | 2014-09-26 | A kind of three position operation mechanisms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104269286A CN104269286A (en) | 2015-01-07 |
| CN104269286B true CN104269286B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410498043.7A Expired - Fee Related CN104269286B (en) | 2014-09-26 | 2014-09-26 | A kind of three position operation mechanisms |
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| Country | Link |
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| CN (1) | CN104269286B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113241280B (en) * | 2021-05-19 | 2025-03-07 | 平顶山森源电气有限公司 | A three-station mechanism auxiliary transmission device |
| CN114464494B (en) * | 2022-01-21 | 2024-03-29 | 苏州万龙电气集团股份有限公司 | DC isolating switch |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2738170B2 (en) * | 1991-07-11 | 1998-04-08 | 日新電機株式会社 | Controller for switchgear |
| CN101937780B (en) * | 2010-09-14 | 2012-08-22 | 沈阳华利能源设备制造有限公司 | Operating mechanism for three-working position switch |
| DE102011111183B4 (en) * | 2011-08-25 | 2022-01-27 | Abb Power Grids Switzerland Ag | Driving device for a multi-position switch |
| CN102945766A (en) * | 2012-11-13 | 2013-02-27 | 常州太平洋电力设备(集团)有限公司 | Three-position operation device used for inflatable cabinet |
| CN103165298B (en) * | 2013-03-07 | 2015-04-01 | 廖明厚 | Single-motor three-station mechanism for switch |
| CN203250679U (en) * | 2013-06-03 | 2013-10-23 | 沈阳东牧电器制造有限公司 | Three-position switch electric operating mechanism for GIS |
| CN204270909U (en) * | 2014-09-26 | 2015-04-15 | 陕西得瑞电力设备有限责任公司 | A kind of three position operation mechanisms |
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2014
- 2014-09-26 CN CN201410498043.7A patent/CN104269286B/en not_active Expired - Fee Related
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| CN104269286A (en) | 2015-01-07 |
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Granted publication date: 20160824 Termination date: 20210926 |