CN113053680B - Quick auto-change over device of transformer - Google Patents
Quick auto-change over device of transformer Download PDFInfo
- Publication number
- CN113053680B CN113053680B CN202110338269.0A CN202110338269A CN113053680B CN 113053680 B CN113053680 B CN 113053680B CN 202110338269 A CN202110338269 A CN 202110338269A CN 113053680 B CN113053680 B CN 113053680B
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- switching device
- transformer
- fixedly connected
- annular
- conductive
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0027—Operating mechanisms
Abstract
The invention relates to the field of transformer related equipment, in particular to a transformer rapid switching device, which comprises a transformer iron core and an articulated shaft, wherein an input coil is wound on the left side of the transformer iron core, five groups of voltage regulating connecting wires are arranged on the left side of the input coil from bottom to top at intervals, power transmission joints are arranged at the left end parts of the five groups of voltage regulating connecting wires, a voltage input device is connected to the upper end of the input coil, the lower end of the voltage input device is connected with a loop connecting wire, the end part of the loop connecting wire is connected with a switching device shell, an installation cavity is arranged in the switching device shell, an annular sliding groove is arranged in the middle of the installation cavity, an arc-shaped hole is arranged at the right rear part of the annular sliding groove, a contact block is arranged at the right end of the loop connecting wire, an annular conducting ring is slidably connected in the annular sliding groove, and a conducting support is fixedly connected at the right end of the annular conducting ring, the invention provides a transformer quick switching device which can be manually and automatically controlled, has quick switching action and simple structure.
Description
Technical Field
The invention relates to the field of transformer related equipment, in particular to a transformer fast switching device.
Background
A transformer is a stationary electrical device used to transform ac voltage and current to transmit ac power. The electric energy transmission is realized according to the principle of electromagnetic induction. Transformers can be classified into power transformers, test transformers, instrument transformers, and transformers for special purposes, in terms of their use: the power transformer is a necessary device for power transmission and distribution and power consumer distribution; the device is used for carrying out voltage withstand (boosting) test on electrical equipment by the test transformer; the instrument transformer is used for electrical measurement and relay protection (PT, CT) of a power distribution system; the transformer for special purposes comprises a furnace transformer for smelting, an electric welding transformer, a rectifier transformer for electrolysis, a small-sized regulating transformer and the like.
A power transformer is a stationary electrical device that is used to transform an ac voltage (current) of a certain value into another voltage (current) of the same frequency or different values. When the primary winding is energized with an alternating current, an alternating magnetic flux is generated, and the alternating magnetic flux is magnetically conducted through the iron core, so that an alternating electromotive force is induced in the secondary winding. The level of the secondary induced electromotive force is related to the number of turns of the primary winding, i.e. the voltage is proportional to the number of turns.
The electric energy passes through the transmission line again and can produce the loss, and the loss divides two kinds, one makes the voltage loss, and another makes the power loss, when carrying same power electric energy, voltage loss and voltage are inversely proportional, and the power loss is inversely proportional with the square of voltage, therefore it can be seen that voltage is higher in the electric energy transmission process, and the loss is littleer, often all changes the output voltage of transformer through the tap changer among the prior art, can reduce the loss in the electric energy retransmission process like this.
Tap changers in the prior art are usually controlled manually, so that the tap changers are troublesome to operate, complicated in structure, high in manufacturing cost, slow in switching action and influenced in power supply.
In order to solve the problems, the invention designs a transformer rapid switching device.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a quick switching device of a transformer. The problems are solved as much as possible, and therefore the transformer quick switching device which can be manually and automatically controlled and has quick switching action and simple structure is provided.
The invention is realized by the following technical scheme:
a transformer fast switching device comprises a transformer core and an articulated shaft, wherein an input coil is wound on the left side of the transformer core, five groups of voltage regulating connecting wires are arranged on the left side of the input coil from bottom to top at intervals, power transmission joints are arranged at the left end parts of the five groups of voltage regulating connecting wires, a voltage input device is connected at the upper end of the input coil, a loop connecting wire is connected at the lower end of the voltage input device, the end part of the loop connecting wire is connected with a switching device shell, an installation cavity is arranged in the switching device shell, an annular chute is arranged in the middle of the installation cavity, an arc-shaped hole is arranged at the right rear part of the annular chute, a contact block is arranged at the right end of the loop connecting wire, an annular conducting ring is connected in the annular chute in a sliding manner, a conducting support is fixedly connected at the right end of the annular conducting ring, an articulated support is arranged at the middle position of the rear part of the right end of the conducting support, the switching device comprises a hinged support, a conductive shifting sheet, a first spring, five groups of voltage-regulating connecting wires, an upper cover disc, a lower base disc, a servo motor, an output shaft, five groups of power transmission joint central lines, an arc, an output shaft, an insulating support, a rotating fluted disc, five groups of tooth grooves, an embedding chute and a power transmission mechanism, wherein the hinged support is hinged with the conductive shifting sheet through a hinged shaft, the first spring is arranged between the right end of the conductive shifting sheet and the front end of the right end of a conductive support, the five groups of voltage-regulating connecting wires are fixedly connected with a fixed block, the front end of the fixed block is fixedly connected with the right end of a switching device shell, the inner end of the annular conductive ring is fixedly connected with the insulating support, the upper end disc and the lower end disc are fixedly mounted at the upper end and the lower end of the switching device shell respectively, the servo motor is fixedly mounted at the middle part of the upper end of the lower base disc, the output shaft is fixedly connected with the output shaft, the five groups of power transmission joint central lines are connected into an arc, the arc and the center of the arc is concentric with the output shaft, the embedded sliding groove is fixedly connected with a second spring at the bottom end, a limiting pin is fixedly connected at the left end of the second spring, the limiting pin is meshed with the tooth groove, and an adjusting turntable is fixedly connected at the top end of the output shaft.
Preferably, the right side of the transformer core is wound with an output coil.
Preferably, the pressure regulating connecting wire is sleeved with a hard tube, the hard tube is fixedly connected with the power transmission connector, and the hard tube is fixedly connected to the fixing block.
Preferably, the angle of the arc-shaped hole is 90 °, and the arc angle of the annular conductive ring is 300 °.
Preferably, the hinge bracket and the hinge shaft have a conductive function.
Preferably, the top end of the lower chassis is provided with a motor mounting groove, the servo motor is embedded into the motor mounting groove and fixedly mounted in the motor mounting groove, and the servo motor is electrically connected with a power supply.
Preferably, the middle part of the upper cover disc is provided with a connecting hole, and the output shaft penetrates through and is rotatably connected with the connecting hole.
Preferably, the radius of the gear ring of the rotating fluted disc is smaller than the radius from the axis of the rotating fluted disc to the farthest edge, and the conductive poking piece in the meshing state can be just switched to be in contact with the other group of power transmission connectors every time the limiting pin is switched once.
Preferably, the left end of the limit pin is in sliding connection with the tooth tip when the second spring is fully compressed.
The invention has the beneficial effects that: drive the output shaft through the regulation carousel that sets up and rotate and then drive annular conducting ring through insulating support and slide along annular spout, make the electrically conductive plectrum that has articulated on the electrically conductive support of annular conducting ring right-hand member adjust to next voltage output gear through articulated support and articulated shaft, the first spring that sets up in this process can make electrically conductive plectrum and next a set of transmission of electricity connect looks electrical contact rapidly after electrically conductive plectrum breaks away from preceding a set of transmission of electricity and connects, improve transformer voltage switching efficiency, it can make the switching action go on automatically to drive the output shaft rotation through the servo motor who sets up, the damping component who constitutes through the rotation fluted disc that the output shaft upper end set up and spacer pin and second spring can make the accuracy more of switching process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is an isometric view of the present invention;
FIG. 4 is a longitudinal sectional view of the present invention;
FIG. 5 is a cross-sectional view of the present invention at a rotating chainring;
fig. 6 is a top view of the present invention.
In the figure: 1-transformer core, 2-output coil, 3-input coil, 4-voltage-regulating connecting wire, 5-power-transmission joint, 6-voltage input device, 7-loop connecting wire, 8-switching device shell, 801-installation cavity, 802-arc hole, 803-embedded sliding groove, 9-electric contact block, 10-annular electric conducting ring, 11-electric conducting support, 12-hinged support, 13-hinged shaft, 14-electric conducting pull sheet, 15-first spring, 16-fixed block, 17-insulating support, 18-lower chassis, 19-upper cover disc, 20-servo motor, 21-output shaft, 22-rotating fluted disc, 2201-tooth groove, 23-second spring, 24-limiting pin and 25-regulating turntable.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, a transformer fast switching device comprises a transformer core 1 and a hinge shaft 13, wherein an input coil 3 is wound on the left side of the transformer core 1, five groups of voltage-regulating connecting lines 4 are arranged on the left side of the input coil 3 from bottom to top at intervals, power transmission connectors 5 are arranged at the left end parts of the five groups of voltage-regulating connecting lines 4, a voltage input device 6 is connected to the upper end of the input coil 3, a loop connecting line 7 is connected to the lower end of the voltage input device 6, a switching device housing 8 is connected to the end part of the loop connecting line 7, a mounting cavity 801 is arranged in the switching device housing 8, an annular chute is arranged in the middle of the mounting cavity 801, an arc-shaped hole 802 is arranged at the right rear side of the annular chute, a contact block 9 is arranged at the right end of the loop connecting line 7, an annular conductive ring 10 is slidably connected in the annular chute, a conductive support 11 is fixedly connected to the right end of the annular ring 10, a hinge support 12 is arranged at the middle position of the right end of the conductive support 11, the hinged support 12 is hinged with a conductive shifting piece 14 through a hinged shaft 13, a first spring 15 is arranged between the right end of the conductive shifting piece 14 and the front part of the right end of the conductive support 11, five groups of voltage-regulating connecting wires 4 are fixedly connected with a fixed block 16, the front end of the fixed block 16 is fixedly connected with the right end of a switching device shell 8, the inner side of the annular conductive ring 10 is fixedly connected with an insulating support 17, the upper end and the lower end of the switching device shell 8 are respectively and fixedly provided with an upper cover disc 19 and a lower chassis 18, the middle part of the upper end of the lower chassis 18 is fixedly provided with a servo motor 20, the output end of the top of the servo motor 20 is fixedly connected with an output shaft 21, five groups of power transmission joints 5 are connected into a circular arc, the circular arc and the output shaft 21 share a circle center, the insulating support 17 is fixedly connected with the output shaft 21, the middle part of the output shaft 21 is fixedly connected with a rotating fluted disc 22, five groups of tooth grooves 2201 are arranged on the right side of the rotating fluted disc 22, an embedding chute 803 is arranged in the middle part of the right side of the inner wall of the switching device shell 8, the bottom end of the embedding chute 803 is fixedly connected with a second spring 23, the left end of the second spring 23 is fixedly connected with a limit pin 24, the limit pin 24 is meshed with the tooth groove 2201, and the top end of the output shaft 21 is fixedly connected with an adjusting turntable 25.
Referring to fig. 1, an output coil 2 is wound on the right side of a transformer core 1, and the output coil 2 and the input coil are used for outputting voltage input by the transformer according to an electromagnetic induction principle.
The outside cover of pressure regulating connecting wire 4 is equipped with the hard pipe, and this hard pipe is in the same place with transmission of electricity joint 5 fixed connection, and hard pipe fixed connection makes whole device can not hard gas regulation connecting wire 4's deformation at the in-process that switches output voltage through the hard pipe that the cover was established on the fixed block 16 that sets up and pressure regulating connecting wire 4, avoids influencing going on of transformer pressure regulating.
Referring to FIG. 2, the angle of the arc hole 802 is 90 °, and the arc angle of the annular conductive ring 10 is 300 °.
The hinged support 12 and the hinged shaft 13 both have a conductive function, so that smooth output of electric energy is ensured.
Referring to fig. 4, a motor mounting groove is formed at the top end of the lower chassis 18, the servo motor 20 is fixedly embedded in the motor mounting groove, the servo motor 20 is electrically connected to a power supply, and the servo motor 20 is matched with an external controller to realize automatic voltage regulation of the transformer, so that the transformer is convenient and fast and has high accuracy.
Referring to fig. 4, the upper cover plate 19 has a connection hole in the middle, and the output shaft 21 penetrates through and is rotatably connected to the connection hole.
Referring to fig. 5, the radius of the gear ring of the rotating toothed disc 22 is smaller than the radius from the axis of the rotating toothed disc 22 to the farthest edge, so as to limit the movement range of the limit pin 24, and avoid the occurrence of the open circuit, and the conductive pads 14 of the limit pin 24 will be switched to contact with another set of power transmission connectors 5 each time the limit pin 24 is switched to the engaged state. When the second spring 23 is fully compressed, the left end of the limit pin 24 is in sliding connection with the tooth tip, and the accuracy of the voltage switching of the transformer can be ensured by matching five groups of tooth grooves 2201 arranged on the right front side of the rotating toothed disc 22 with a damping assembly formed by the limit pin 24 and the second spring 23.
In the invention, when the output voltage of the transformer needs to be changed, an operator can manually rotate the adjusting turntable 25 or control the servo motor 20 to rotate through an external controller, at the moment, the output shaft 21 rotates, because the annular sliding chute is connected with the annular conducting ring 10 in a sliding manner, the right end of the annular conducting ring 10 is fixedly connected with the conducting support 11, the middle position of the rear part of the right end of the conducting support 11 is provided with the hinged support 12, the hinged support 12 is hinged with the conducting plectrum 14 through the hinged shaft 13, the first spring 15 is arranged between the right end of the conducting plectrum 14 and the front part of the right end of the conducting support 11, at the moment, the conducting plectrum 14 is gradually separated from the power transmission joint 5 at the previous position, during the separation process, the inner side end of the conducting plectrum 14 is still electrically connected with the power transmission joint 5, but the conducting plectrum 14 rotates along the hinged support 12 through the hinged shaft 13, under the thrust action of the first spring 15 at the moment when the inner side end of the conducting plectrum 14 is separated from the left end of the power transmission joint, the conductive shifting piece 14 is instantly switched to the next group of power transmission connectors 5 and is electrically connected, the switching efficiency is high, because the middle part of the output shaft 21 is fixedly connected with a rotating fluted disc 22, five groups of tooth grooves 2201 are arranged in the right front of the rotating fluted disc 22, the middle part of the right side of the inner wall of the shell 8 of the switching device is provided with an embedded chute 803, the bottom end of the embedded chute 803 is fixedly connected with a second spring 23, the left end of the second spring 23 is fixedly connected with a limit pin 24, the limit pin 24 is meshed with the tooth grooves 2201, the radius of a gear ring of the rotating fluted disc 22 is smaller than that of the axis of the rotating fluted disc 22 to the farthest edge, the motion range of the limit pin 24 is limited, the occurrence of the broken circuit condition is avoided, and the conductive shifting piece 14 in the meshed state is just switched to be contacted with the other group of power transmission connectors 5 every time when the limit pin 24 is switched once. When the second spring 23 is completely compressed, the left end of the limiting pin 24 is in sliding connection with the tooth tip, five groups of tooth grooves 2201 arranged on the right front side of the rotating fluted disc 22 are matched with a damping assembly formed by the limiting pin 24 and the second spring 23 for use, so that the accuracy of voltage switching of the transformer can be guaranteed, the whole device is electrically connected with the power transmission connectors 5 at different coil turn positions respectively through the switching conductive poking pieces 14 to change output voltage, and the device is convenient and simple to operate, simple in structure, low in manufacturing cost and high in commercial value.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a transformer fast switch over device which characterized in that: including transformer core (1) and articulated shaft (13), transformer core (1) left side is around being equipped with input coil (3), input coil (3) left side is provided with five groups of pressure regulating connecting wire (4) by lower supreme interval, and five groups of pressure regulating connecting wire (4) left side tip all is provided with transmission of electricity and connects (5), input coil (3) upper end is connected with voltage input device (6), voltage input device (6) lower extreme is connected with return circuit connecting wire (7), return circuit connecting wire (7) end connection has switching device shell (8), switching device shell (8) inside is equipped with installation cavity (801), installation cavity (801) middle part is equipped with annular spout, the annular spout right side is equipped with arc hole (802), return circuit connecting wire (7) right-hand member is provided with touches electric block (9), sliding connection has annular conducting ring (10) in the annular spout, the conductive support (11) is fixedly connected with the right end of the annular conductive ring (10), a hinged support (12) is arranged at the middle position of the rear part of the right end of the conductive support (11), the hinged support (12) is hinged with a conductive shifting piece (14) through a hinged shaft (13), a first spring (15) is arranged between the right end of the conductive shifting piece (14) and the front part of the right end of the conductive support (11), five groups of voltage-regulating connecting wires (4) are fixedly connected with a fixed block (16), the front end of the fixed block (16) is fixedly connected with the right end of the switching device shell (8), an insulating support (17) is fixedly connected with the inner side end of the annular conductive ring (10), an upper cover disc (19) and a lower chassis (18) are respectively and fixedly mounted at the upper end and the lower end of the switching device shell (8), a servo motor (20) is fixedly mounted at the middle part of the upper end of the lower chassis (18), and an output end of the servo motor (20) is fixedly connected with an output shaft (21), five groups of transmission of electricity connect (5) central lines and link into an circular arc and this circular arc and output shaft (21) centre of a circle altogether, insulating support (17) fixed connection is on output shaft (21), output shaft (21) middle part fixedly connected with rotates fluted disc (22), it is provided with five groups of tooth's socket (2201) to rotate fluted disc (22) right front, auto-change over device shell (8) inner wall right side middle part is equipped with embedding spout (803), embedding spout (803) bottom fixedly connected with second spring (23), second spring (23) left end fixedly connected with spacer pin (24), spacer pin (24) and tooth's socket (2201) mesh mutually, output shaft (21) top fixedly connected with adjusts carousel (25).
2. The fast switching device of claim 1, wherein: and the right side of the transformer iron core (1) is wound with an output coil (2).
3. The fast switching device of claim 1, wherein: the external cover of pressure regulating connecting wire (4) is equipped with the hard pipe, and this hard pipe is in the same place with transmission of electricity joint (5) fixed connection, hard pipe fixed connection is on fixed block (16).
4. The fast switching device of claim 1, wherein: the angle of the arc-shaped hole (802) is 90 degrees, and the arc angle of the annular conducting ring (10) is 300 degrees.
5. The fast switching device of claim 1, wherein: the hinged support (12) and the hinged shaft (13) both have a conductive function.
6. The fast switching device of claim 1, wherein: the top end of the lower chassis (18) is provided with a motor mounting groove, the servo motor (20) is embedded and fixedly mounted in the motor mounting groove, and the servo motor (20) is electrically connected with a power supply.
7. The fast switching device of claim 1, wherein: the middle part of the upper cover disc (19) is provided with a connecting hole, and the output shaft (21) penetrates through and is rotatably connected with the connecting hole.
8. The fast switching device of claim 1, wherein: the radius of a gear ring of the rotating fluted disc (22) is smaller than the radius from the axle center to the farthest edge of the rotating fluted disc (22), and the limit pin (24) can be just switched to be in contact with another group of power transmission connectors (5) when the conductive poking piece (14) is switched to be in an engaged state every time.
9. The fast switching device of claim 1, wherein: when the second spring (23) is completely compressed, the left end of the limiting pin (24) is in sliding connection with the tooth tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110338269.0A CN113053680B (en) | 2021-03-30 | 2021-03-30 | Quick auto-change over device of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110338269.0A CN113053680B (en) | 2021-03-30 | 2021-03-30 | Quick auto-change over device of transformer |
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| CN113053680A CN113053680A (en) | 2021-06-29 |
| CN113053680B true CN113053680B (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110338269.0A Active CN113053680B (en) | 2021-03-30 | 2021-03-30 | Quick auto-change over device of transformer |
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| JP2001044051A (en) * | 1999-05-21 | 2001-02-16 | Tohoku Electric Power Co Inc | Variable transformer |
| CN101196752A (en) * | 2006-12-04 | 2008-06-11 | 井上和一 | Voltage stabilizer |
| DE102011008394A1 (en) * | 2011-01-12 | 2012-07-12 | Maschinenfabrik Reinhausen Gmbh | step switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011107460A1 (en) * | 2011-07-16 | 2013-01-17 | Maschinenfabrik Reinhausen Gmbh | Method for load switching and diverter switch for a tap changer |
| DE202011109470U1 (en) * | 2011-12-22 | 2013-03-25 | Maschinenfabrik Reinhausen Gmbh | Drive unit for tap changer |
| CN104517742B (en) * | 2014-12-29 | 2018-04-24 | 刁俊起 | A kind of permanent magnetic drive on-load voltage regulating switch |
| CN205376283U (en) * | 2015-12-24 | 2016-07-06 | 安徽广远电器有限公司 | Transformer with voltage control device |
| US10082810B2 (en) * | 2016-12-20 | 2018-09-25 | General Electric Technology Gmbh | Voltage regulator system and method of use |
| CN206532691U (en) * | 2017-01-18 | 2017-09-29 | 深圳市先高电子有限公司 | A kind of flat-plate transformer for being easy to adjust |
| CN207587514U (en) * | 2017-12-20 | 2018-07-06 | 江西江控电气有限公司 | A kind of on-load regulator transformer |
| CN110246712A (en) * | 2019-07-25 | 2019-09-17 | 江苏伊顿电气科技有限公司 | A kind of on-load tap-changer of transformer |
| CN111755232A (en) * | 2020-07-29 | 2020-10-09 | 潘良 | Wide-range multi-gear adjustable user transformer capable of increasing and decreasing voltage |
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2021
- 2021-03-30 CN CN202110338269.0A patent/CN113053680B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001044051A (en) * | 1999-05-21 | 2001-02-16 | Tohoku Electric Power Co Inc | Variable transformer |
| CN101196752A (en) * | 2006-12-04 | 2008-06-11 | 井上和一 | Voltage stabilizer |
| DE102011008394A1 (en) * | 2011-01-12 | 2012-07-12 | Maschinenfabrik Reinhausen Gmbh | step switch |
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