CN110021485B - Double-power-supply change-over switch - Google Patents
Double-power-supply change-over switch Download PDFInfo
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- CN110021485B CN110021485B CN201810018490.6A CN201810018490A CN110021485B CN 110021485 B CN110021485 B CN 110021485B CN 201810018490 A CN201810018490 A CN 201810018490A CN 110021485 B CN110021485 B CN 110021485B
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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
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Abstract
The invention relates to a dual-power transfer switch which comprises a load side phase line pole, a first phase line switch, a second phase line switch, a load side neutral pole, a first neutral line switch and a second neutral line switch. And when the first phase line switch and the second phase line switch are both turned off, the first neutral line switch and the second neutral line switch are both turned on. When the first power supply starts to supply power, the first phase line switch immediately starts to switch to the conducting position, the second neutral line switch starts to switch to the cut-off position later than the switching time of the first phase line switch, and finally the second neutral line switch is cut off at the moment when the first phase line switch is switched on. When the second power supply starts supplying power, the second phase line switch immediately starts switching to the on position, the first neutral line switch starts switching to the off position later than the switching timing of the second phase line switch, and finally the first neutral line switch is turned off at the moment when the second phase line switch is turned on.
Description
Technical Field
The present application relates to dual power transfer switches, and more particularly to a dual power transfer switch with overlapping neutral lines.
Background
The dual power transfer switch is created in response to the requirement of continuity of power supply. With the continuous and deep requirements of people on the continuity, safety and reliability of power supply, the dual-power transfer switch is more and more widely applied. In important public places such as hotels and theaters where people gather, the power supply interruption causes disorder and even endangers the life safety of guests. The relevant industry standards specify that its power distribution system must have emergency power supplies. As another example of a data center, the absence of a supply voltage means the loss of data. People use the combination of the double-power transfer switch and the UPS to supply power so as to ensure the continuity of the power supply. However, since the neutral line, like the other phase lines, is temporarily disconnected during the switching of the power supply, this causes fluctuations in the partial power set voltage and thus effects and losses. For example, in the application of an ATSE and UPS combined data center uninterruptible power supply, the short disconnection of the neutral line causes the UPS zero voltage to rise and causes the server to restart, resulting in serious consequences such as data loss or server damage. Reliable neutral overlap switching, i.e. a neutral overlap time as long as possible during a transition from a regular power supply (backup power supply) to a backup power supply (regular power supply) and a reliable and fast switching off of the neutral of the regular power supply (backup power supply) at the end of the transition, is a great concern and urgent need.
The phase pole and the neutral pole are different in structure, so that the neutral pole is not disconnected with the neutral line of the two power supplies at the same time in the process of converting the phase line from the first power supply to the second power supply. There are instances where the neutral line of both power sources is connected simultaneously.
The phase line pole of the change-over switch with the non-neutral line overlapping structure is basically consistent with the neutral line structure, the neutral line is simultaneously changed over from the first power supply to the second power supply in the change-over process of the phase line from the first power supply to the second power supply, and the neutral line of the two power supplies is simultaneously disconnected in the change-over process when the neutral line is short.
Disclosure of Invention
Accordingly, the present invention provides a dual power transfer switch, comprising: a load side phase line pole, one end of which is electrically connected with the load phase line; a first phase line switch, one end of which is electrically connected with the other end of the load side phase line pole and selectively turns on or off the electrical connection of the first phase line pole and the first power supply; a second phase line switch having one end electrically connected to the other end of the load side phase line pole and selectively turning on or off the electrical connection of the second phase line pole to the second power supply; a load-side neutral line pole having one end electrically connected to the load neutral line; a first neutral switch having one end electrically connected to the other end of the load-side neutral pole and selectively turning on or off the electrical connection of the first neutral pole to the first power source; a second neutral wire switch having one end electrically connected to the other end of the load-side neutral wire pole and selectively turning on or off the electrical connection of the second neutral wire pole to a second power source, a main shaft pivotally mounted on the housing of the dual power transfer switch such that rotation of the main shaft causes the first phase wire switch, the second phase wire switch, the first neutral wire switch and the second neutral wire switch to perform corresponding actions to turn on or off, wherein the first neutral wire switch and the second neutral wire switch are turned on when both the first phase wire switch and the second phase wire switch are turned off, wherein the first phase wire switch immediately starts switching to the on position when the first power source starts supplying power, and the second neutral wire switch starts switching to the off position later than the switching timing of the first phase wire switch and finally starts to turn on the first phase wire switch at the instant when the first phase wire switch is turned on, the second neutral wire switch is turned off, wherein the second phase wire switch immediately starts switching to the on position when the second power supply starts supplying power, and the first neutral wire switch starts switching to the off position later than the switching timing of the second phase wire switch, and finally the first neutral wire switch is turned off at the moment when the second phase wire switch is turned on. According to an embodiment of the invention, the first and second neutral switches are oppositely disposed with respect to the main shaft, and a resilient member is connected between the first and second neutral switches to bias the first and second neutral switches towards the conducting position.
The first neutral line switch includes: the first neutral switch moving contact is pivotally arranged on the first neutral switch moving contact support, the first neutral switch moving contact support is pivotally arranged on the shell, and the first neutral switch moving contact can pivot according to the pivoting of the main shaft to be in contact with or separated from a static contact of a first power supply and a static contact of a load side neutral line pole, so that the first power supply is switched on or switched off; the moving contact of the first neutral line switch drives the cam, is fixedly arranged on the main shaft and can rotate along with the main shaft; and the third pin is arranged in a first cam groove of the first neutral switch moving contact driving cam so as to move relatively along the first cam groove when the main shaft pivots.
The second neutral line switch includes: the second neutral switch moving contact is pivotally arranged on a second neutral switch moving contact support which is pivotally arranged on the shell, and can pivot to be in contact with or separated from a static contact of a second power supply and a static contact of a load side neutral line pole according to the pivoting of the main shaft, so that the second power supply is switched on or switched off; the second neutral line switch moving contact driving cam is fixedly installed on the main shaft and can rotate along with the main shaft, one end of the second connecting rod is hinged to the second neutral line switch moving contact support, the other end of the second connecting rod surrounds the pivoting center of the main shaft, and the fourth pin is arranged in a second cam groove of the second neutral line switch moving contact driving cam so as to move along the second cam groove relatively when the main shaft pivots.
The first cam groove and the second cam groove are configured to enable the third pin and the fourth pin to respectively and relatively move in the first cam groove and the second cam groove when the main shaft rotates in the first direction and the second direction, so that the first neutral line switch movable contact support and the second neutral line switch movable contact support respectively perform corresponding actions to realize the connection and disconnection of the first neutral line switch and the second neutral line switch.
According to an embodiment of the present invention, the first cam groove includes a first portion and a second portion, an arc radius of the first portion is equal to a distance from the rotation center of the third pin, and an arc radius of the first portion is different from an arc radius of the second portion, so that when the main shaft rotates in the second direction and the first neutral switch is switched from the on position to the off position, the third pin can push or pull the first neutral switch moving contact bracket, and further push or pull the first neutral switch moving contact to be in contact with or separated from the fixed contact of the first power source and the fixed contact of the load-side neutral pole.
The second cam groove comprises a third part and a fourth part, the arc radius of the third part is equal to the distance between the fourth pin and the rotation center, the arc radius of the third part is different from the arc radius of the fourth part, so that when the main shaft rotates along the first direction, and the second neutral line switch is switched from the conducting position to the stopping position, the fourth pin can push or pull the second neutral line switch moving contact support, and further push or pull the second neutral line switch moving contact, so that the second neutral line switch moving contact is in contact with or separated from the static contact of the second power supply and the static contact of the load side neutral line pole.
According to an embodiment of the invention, when the main shaft is in the intermediate position and the first phase switch and the second phase switch are in the blocking position, the first neutral switch and the second neutral switch are both in the conducting position, when the main shaft rotates in the first direction, said first phase switch immediately starts switching to the conducting position, at the same time, the first neutral switch movable contact driving cam and the second neutral switch movable contact driving cam rotate in the first direction, so that the third pin moves along the first portion of the first cam groove, the fourth pin moves from the third portion of the second cam groove to the fourth portion, since the arc radius of the first portion is equal to the distance of the third pin from the center of rotation, and the arc radius of the fourth portion is different from the distance of the fourth pin from the center of rotation, the first link does not push or pull the first neutral switch movable contact holder, and the second link does not push or pull the second neutral switch movable contact holder during the movement of the fourth pin along the third portion and at the second link does not push or pull the second neutral switch movable contact holder The fourth pin pushes or pulls the second neutral switch moving contact support during the movement along the fourth portion, so that the second neutral switch moving contact support rotates along the first direction, the second neutral switch moving contact rotates along the first direction, and the second neutral switch moving contact is separated from contact with the static contact of the second power supply and the static contact of the load side neutral line pole, the first neutral switch is kept on, and the second neutral switch is cut off.
According to an embodiment of the present invention, when the arc radius of the fourth portion is greater than the arc radius of the third portion and one end of the second link is hinged to the third end of the second moving contact neutral switch support, the second link pushes the second moving contact neutral switch support to rotate in the first direction.
According to an embodiment of the present invention, when the arc radius of the fourth portion is smaller than the arc radius of the third portion and one end of the second link is hinged to the fourth end of the second neutral switch movable contact support, the second link pulls the second neutral switch movable contact support to rotate in the first direction.
According to the embodiment of the present invention, when the main shaft rotates in the second direction, the first phase switch immediately starts to switch to the off position, and at the same time, the first neutral switch movable contact driving cam and the second neutral switch movable contact driving cam rotate in the second direction, so that the third pin moves along the first portion of the first cam groove, the fourth pin disengages from the fourth portion of the second cam groove and enters the third portion, since the arc radius of the first portion is equal to the distance from the rotation center of the third pin, and the arc radius of the fourth portion is different from the distance from the rotation center of the fourth pin, the first link does not push or pull the first neutral switch movable contact support, and the second link pushes or pulls the second neutral switch movable contact support, so that the second neutral switch movable contact support rotates in the second direction, and the second neutral switch movable contact rotates in the second direction, thereby, the first neutral line switch is kept conducted by the contact with the fixed contact of the second power supply and the fixed contact of the load side neutral line pole, and the second neutral line switch is changed from off to on.
According to an embodiment of the present invention, when the arc radius of the fourth portion is greater than the arc radius of the third portion and one end of the second link is hinged to the third end of the second neutral switch moving contact support, the second link pulls the second neutral switch moving contact support to rotate in the second direction.
According to an embodiment of the present invention, when the arc radius of the fourth portion is smaller than the arc radius of the third portion and one end of the second link is hinged to the fourth end of the second movable contact bracket of the neutral switch, the second link pushes the second movable contact bracket of the neutral switch to rotate in the second direction.
According to an embodiment of the present invention, when the main shaft is in the neutral position and the first phase switch and the second phase switch are in the off position, the first neutral switch and the second neutral switch are both in the on position, and when the main shaft is rotated in the second direction, the second phase switch immediately begins to switch to the on position while the first neutral switch movable contact drive cam and the second neutral switch movable contact drive cam rotate in the second direction such that the third pin moves from the first portion to the second portion of the first cam slot and the fourth pin moves along the third portion of the second cam slot, the first link does not push or pull the first neutral switch movable contact holder during movement of the third pin along the first portion and pushes or pulls the first neutral switch movable contact holder during movement of the third pin along the second portion since the arc radius of the second portion is not equal to the distance of the third pin from the center of rotation and the arc radius of the third portion is equal to the distance of the center of rotation of the fourth pin The moving contact support and the second connecting rod cannot push or pull the moving contact support of the second neutral line switch, so that the moving contact support of the first neutral line switch rotates along the second direction, the moving contact of the first neutral line switch is separated from the contact with the static contact of the first power supply and the static contact of the load side neutral line pole, the first neutral line switch is cut off, and the second neutral line switch is kept on.
According to an embodiment of the invention, when the arc radius of the second portion is greater than the arc radius of the first portion and one end of the first link is hinged to the first end of the first neutral switch movable contact support, the first link pushes the first neutral switch movable contact support to rotate in the second direction.
According to an embodiment of the invention, when the arc radius of the second portion is smaller than the arc radius of the first portion, and one end of the first link is hinged to the second end of the first neutral switch movable contact support, the first link pulls the first neutral switch movable contact support to rotate in the second direction.
According to the embodiment of the invention, when the main shaft rotates along the first direction, the second neutral switch immediately starts to switch to the cut-off position, and simultaneously, the first neutral switch movable contact driving cam and the second neutral switch movable contact driving cam rotate along the first direction, so that the third pin is separated from the second part of the first cam groove and enters the first part, the fourth pin moves along the third part of the second cam groove, because the arc radius of the second part is not equal to the distance between the third pin and the rotation center, and the arc radius of the third part is equal to the distance between the fourth pin and the rotation center, the first connecting rod can push or pull the first neutral switch movable contact support, and the second connecting rod can not push or pull the second neutral switch movable contact support, so that the first neutral switch movable contact support rotates along the first direction, and the first neutral switch movable contact rotates along the first direction, thereby contacting the stationary contact of the first power supply and the stationary contact of the load-side neutral line pole, so that the first neutral line switch is changed from off to on, and the second neutral line switch remains on.
According to an embodiment of the invention, when the arc radius of the second portion is greater than the arc radius of the first portion, and one end of the first link is hinged to the first end of the first neutral switch movable contact support, the first link pulls the first neutral switch movable contact support to rotate in the first direction.
According to an embodiment of the invention, when the arc radius of the second portion is smaller than the arc radius of the first portion, and one end of the first link is hinged to the second end of the first neutral switch movable contact support, the first link pushes the first neutral switch movable contact support to rotate in the first direction.
According to an embodiment of the invention, the first and second neutral switches are oppositely disposed with respect to the main shaft, the first resilient element is connected between the first neutral switch and the housing, the second resilient element is connected between the second neutral switch and the housing such that the first and second neutral switches respectively bias the first and second neutral switches towards the conducting position, and the third lever is pivotally mounted to the main shaft to be rotatable with rotation of the main shaft.
The first neutral line switch includes: the first neutral switch moving contact is pivotally arranged on the first neutral switch moving contact support, the first neutral switch moving contact support is pivotally arranged on the shell, and the first neutral switch moving contact can pivot according to the pivoting of the main shaft to be in contact with or separated from a static contact of a first power supply and a static contact of a load side neutral line pole, so that the first power supply is switched on or switched off; and one end of the fourth rod is fixedly connected to one end of the third rod, the other end of the fourth rod is provided with a fourth groove, and a fifth pin of the moving contact support of the first neutral switch is accommodated in the fourth groove.
The second neutral line switch includes: the second neutral switch moving contact is pivotally arranged on a second neutral switch moving contact support which is pivotally arranged on the shell, and can pivot to be in contact with or separated from a static contact of a second power supply and a static contact of a load side neutral line pole according to the pivoting of the main shaft, so that the second power supply is switched on or switched off; and one end of the fifth rod is fixedly connected to the other end of the third rod, the other end of the fifth rod is provided with a fifth groove, and a sixth pin of the second neutral switch moving contact support is accommodated in the fifth groove.
According to an embodiment of the present invention, when the main shaft is in the intermediate position and the first phase line switch and the second phase line switch are in the off position, both the first neutral line switch and the second neutral line switch are in the on position, and when the main shaft rotates in the second direction, the third rod also rotates in the second direction, so that the fourth rod moves such that the fifth pin abuts against one end of the fourth groove, and the fifth rod moves such that the sixth pin does not abut against any end of the fifth groove, and as the third rod further rotates, the third rod pushes the first neutral line switch moving contact bracket and the first neutral line switch moving contact thereby to rotate in the first direction, so that the first neutral line switch moving contact is separated from contact with the fixed contact of the first power supply and the fixed contact of the load side neutral line pole, so that the second neutral line switch is kept on, and the first neutral line switch is changed from on to off.
According to an embodiment of the present invention, when the main shaft is in the intermediate position and the first phase switch and the second phase switch are in the off position, the first neutral switch and the second neutral switch are both in the on position, and when the main shaft rotates in the first direction, the third rod also rotates in the first direction, so that the fifth rod moves such that the sixth pin abuts against one end of the fifth groove, and the fourth rod moves such that the fifth pin does not abut against any end of the fourth groove, and with further rotation of the fifth rod, the fifth rod pushes the second neutral switch moving contact bracket and the second neutral switch moving contact thereby to rotate in the second direction, so that the second neutral switch moving contact is separated from contact with the fixed contact of the second power source and the fixed contact of the load-side neutral pole, so that the first neutral switch is kept on, and the second neutral switch is changed from on to off
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without creative efforts.
Fig. 1 shows a schematic diagram in which both the first phase line switch and the second phase line switch are off, according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram in which both the first neutral switch and the second neutral switch are conductive, according to an embodiment of the invention.
Fig. 3 shows a schematic diagram of the states of the first phase line switch and the second phase line switch when the main shaft starts to rotate in the first direction.
Fig. 4 shows an electrical diagram of the state of the first and second neutral switches at the time shown in fig. 3.
Fig. 5 shows the spindle further rotated in the first direction with the first phase switch held on and the second phase switch off.
Fig. 6 shows a schematic diagram of the first neutral switch remaining on and the second neutral switch being off at the time shown in fig. 5.
Fig. 7 is a schematic diagram showing the states of the first phase line switch and the second phase line switch when the main shaft starts to rotate in the second direction.
Fig. 8 shows an electrical diagram of the state of the first and second neutral switches at the time shown in fig. 7.
Fig. 9 shows a schematic diagram in which the main shaft is further rotated in the second direction, the first phase line switch is turned off, and the second phase line switch remains on.
Fig. 10 shows a schematic diagram of the first neutral switch being turned off and the second neutral switch remaining on at the time shown in fig. 9.
Fig. 11 shows a schematic diagram in which both the first neutral switch and the second neutral switch are conductive, according to another embodiment of the invention.
Fig. 12 shows a schematic view of the spindle rotating in a first direction, the first neutral switch remaining on and the second neutral switch being off.
Fig. 13 shows a schematic view of the spindle rotating in a second direction, the first neutral switch being off and the second neutral switch remaining on.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
Fig. 1 and 2 show schematic diagrams in which the first phase line switch and the second phase line switch are turned off and the first neutral line switch and the second neutral line switch are turned on when the main shaft is not rotated.
Referring first to fig. 1, one end of the first phase switch is electrically connected to one end of the load-side phase line pole, and the other end of the load-side phase line pole is electrically connected to the load phase line, so that the first phase switch is electrically connected to or disconnected from the load phase line. One end of the second phase line switch is electrically connected with one end of the load side phase line pole, and the other end of the load side phase line pole is electrically connected with the load phase line, so that the second phase line switch is electrically connected with or disconnected from the load phase line. In addition, referring to fig. 2, one end of the first neutral wire switch is electrically connected to one end of the load-side neutral wire pole, and the other end of the load-side neutral wire pole is electrically connected to the load neutral wire, so that the first neutral wire switch is electrically connected to or electrically disconnected from the load neutral wire. One end of the second neutral wire switch is electrically connected to one end of the load-side neutral wire pole, and the other end of the load-side neutral wire pole is electrically connected to the load neutral wire, so that the second neutral wire switch is electrically connected to or disconnected from the load neutral wire.
Referring back to fig. 1, the main shaft 1 is pivotably mounted on a housing of the dual power transfer switch. The first phase switch includes a first phase switch movable contact 21 pivotally mounted on a first phase switch movable contact support 22. The movable contact support of the first phase line switch is pivotally arranged on a shell of the dual-power transfer switch. One end of the first lever 23 is fixedly mounted on the main shaft 1 so that the first lever 23 can move with the rotation of the main shaft. The other end of the first rod 23 has a first groove 231, the first pin 221 of the first phase line switch moving contact support 22 is accommodated in the first groove 231, so that when the first rod 23 moves along with the rotation of the main shaft, the first groove 231 moves relative to the first pin 221, and finally the first pin 221 abuts against one end of the first groove 231, at this time, the first rod 23 pushes or pulls the first phase line switch moving contact support 22 and the first phase line switch moving contact 21 rotating, so that the first phase line switch moving contact 21 contacts with or separates from the fixed contact of the first power supply and the fixed contact of the load side phase line pole, thereby turning on or off the first power supply.
The second phase line switch includes a second phase line switch movable contact 31 pivotally mounted on a second phase line switch movable contact bracket 32. The movable contact support of the second phase line switch is pivotally arranged on the shell of the dual-power transfer switch. One end of the second lever 33 is fixedly mounted on the main shaft 1 so that the second lever 33 can move with the rotation of the main shaft. The other end of the second rod 33 has a second groove 331, and the second pin 321 of the second phase line switch movable contact support 32 is received in the second groove 231, so that when the second rod 33 moves along with the rotation of the main shaft, the second groove 331 moves relative to the second pin 321, and finally the second pin 321 abuts against one end of the second groove 331, at this time, the second rod 33 pushes or pulls the second phase line switch movable contact support 32 and the second phase line switch movable contact 31 thereby to rotate, so that the second phase line switch movable contact 31 is in contact with or separated from the fixed contact of the second power source and the fixed contact of the load side phase line pole, thereby turning on or off the second power source.
It should be noted that the present description is only illustrative of the phase configuration shown in the drawings and that those skilled in the art will appreciate that the neutral configuration of the present invention can be used with any suitable phase configuration.
Referring now to fig. 2, the first neutral switch includes a first neutral switch movable contact 41 pivotally mounted on a first neutral switch movable contact bracket 42, the first neutral switch movable contact bracket 42 being pivotally mounted on the housing. The first neutral switch further comprises a first neutral switch movable contact drive cam 43 fixedly mounted on the main shaft and capable of rotating with the main shaft. In this example, the first link 44 has one end hinged to the second end of the first neutral switch movable contact support 42 and the other end fixed about the pivot centre of the main shaft. The third pin 441 of the first link 44 is accommodated in the first cam groove 431 of the first neutral switch movable contact driving cam 43 to move relative to the first cam groove within the first cam groove when the main shaft is pivoted.
The first cam slot 431 includes a first portion 4311, in this example having an arc radius equal to the distance of the third pin 441 from the center of rotation, and a second portion 4312, in this example having an arc radius greater than the arc radius of the second portion, such that when the first neutral switch is switched from the on position to the off position, the third pin is able to pull the first neutral switch movable contact carrier, and thus the first neutral switch movable contact, out of engagement with the stationary contact of the first power source and the stationary contact of the load side neutral pole, as described in detail below.
It will be appreciated by those skilled in the art that the first link 44 may also have one end hinged to a first end of the first neutral switch movable contact support 42, in which case the arc radius of the first portion is smaller than the arc radius of the second portion, so that when the first neutral switch is switched from the on position to the off position, the third pin can push the first neutral switch movable contact support and, in turn, the first neutral switch movable contact away from the stationary contact of the first power source and the stationary contact of the load side neutral pole.
The second neutral switch includes a second neutral switch movable contact 51 pivotally mounted on a second neutral switch movable contact support 52, the second neutral switch movable contact support 52 being pivotally mounted on the housing. The second neutral switch further comprises a second neutral switch movable contact drive cam 53 fixedly mounted on the main shaft and capable of rotating with the main shaft. In this example, one end of the second link 54 is hinged to the third end of the second neutral switch moving contact support 52, and the other end is fixed around the pivot center of the main shaft. The fourth pin 541 of the second link 54 is accommodated in the second cam groove 531 of the second neutral switch movable contact driving cam 53 to move relative to the second cam groove in the second cam groove when the main shaft is pivoted.
The second cam slot 531 includes a third portion 5311 having an arc radius equal to the distance of the fourth pin 541 from the center of rotation, and a fourth portion 5312 having an arc radius less than the arc radius of the fourth portion, such that when the second neutral switch is switched from the on position to the off position, the fourth pin can push the second neutral switch movable contact holder, and thus the second neutral switch movable contact, into and out of contact with the stationary contact of the second power source and the stationary contact of the load side neutral pole, as described in detail below.
It will be appreciated by those skilled in the art that the second link 54 may also have one end hinged to a fourth end of the second neutral switch movable contact support 52, in which case the arc radius of the third portion is greater than the arc radius of the fourth portion, such that when the second neutral switch is switched from the on position to the off position, the fourth pin can pull the second neutral switch movable contact support, and thus the second neutral switch movable contact, away from the stationary contact of the second power source and the stationary contact of the load side neutral pole.
The process in which the spindle is rotated in the counterclockwise direction, the first power switch is turned on, and the second power switch is turned off will be described in detail with reference to fig. 3 to 6.
When the spindle starts to rotate in the counterclockwise direction, the first rod 23 will move upward due to the rotation of the spindle, so that the first pin 221 abuts against the end of the first groove 231 of the first rod 23, and the second rod will also move upward due to the rotation of the spindle, but the second pin 321 will not abut against the end of the second groove 331 of the second rod 33. After the first pin 221 abuts against the end of the first groove 231, the first rod 23 further moves along with the further rotation of the main shaft, so as to push the first phase line switch moving contact support 22 and the first phase line switch moving contact 21 to rotate in the counterclockwise direction, so that the first phase line switch moving contact 21 contacts with the fixed contact of the first power source and the fixed contact of the load side phase line pole, and the conduction of the first phase line switch is realized.
In this process, as the main shaft rotates in the counterclockwise direction, the first neutral switch movable contact driving cam 43 and the second neutral switch movable contact driving cam 53 also rotate in the counterclockwise direction. During this time, the third pin 441 relatively moves within the first portion of the first cam groove 431, and the fourth pin 541 moves from the third portion to the fourth portion of the second cam groove 531. As described above, since the arc radius of the first portion is equal to the distance between the third pin 441 and the rotation center, and the arc radius of the fourth portion is greater than the arc radius of the third portion, the first link 44 does not pull the first neutral switch moving contact support, and the second link 54 pushes the second neutral switch moving contact support, so that the second neutral switch moving contact support rotates in the counterclockwise direction, and the second neutral switch moving contact rotates in the counterclockwise direction, and thus the second neutral switch moving contact is separated from the contact with the fixed contact of the second power source and the fixed contact of the load side neutral pole, so that the first neutral switch is kept on, and the second neutral switch is turned off.
Similarly, as will be understood by those skilled in the art, in the above case, when the main shaft is rotated in the clockwise direction, the first pin 221 abuts against the other end of the first groove 231 of the first rod 23, so that the first phase switch movable contact support and the first phase switch movable contact rotate in the clockwise direction, the second pin 321 relatively moves in the second groove 331 of the second rod 33, and does not abut against the other end of the second groove, so that the first phase switch is changed from on to off, and the second phase switch is kept off. During this period, the first neutral switch moving contact driving cam 43 and the second neutral switch moving contact driving cam 53 rotate in a clockwise direction, so that the third pin 441 relatively moves in the first portion of the first cam groove 431, the fourth pin 541 disengages from the fourth portion of the second cam groove 531 and enters the third portion, because the arc radius of the first portion is equal to the distance from the third pin to the center of rotation, and the arc radius of the fourth portion is greater than the distance from the fourth pin to the center of rotation, the first link does not pull the first neutral switch moving contact bracket, the second link pushes the second neutral switch moving contact bracket, so that the second neutral switch moving contact bracket rotates in the clockwise direction, and the second neutral switch moving contact rotates in the clockwise direction, so as to contact with the static contact of the second power source and the static contact of the load-side neutral pole, so that the first neutral switch is kept in conduction, the second neutral line switch changes from off to on.
Next, the process in which the spindle is rotated in the clockwise direction, the second power switch is turned on, and the first power switch is turned off will be described in detail with reference to fig. 7 to 10.
When the spindle starts to rotate in the clockwise direction, the second lever will move downwards due to the rotation of the spindle, so that the second pin 321 abuts against the end of the second groove 331 of the second lever 33, and the first lever 23 will also move downwards due to the rotation of the spindle, but the first pin 221 will not abut against the end of the first groove 231 of the first lever 23. After the second pin 321 abuts against the end of the second groove 331, the second rod 33 moves further along with the further rotation of the main shaft, so as to push the second phase switch moving contact support 32 and the second phase switch moving contact 31 to rotate clockwise, so that the second phase switch moving contact 31 contacts with the fixed contact of the first power supply and the fixed contact of the load side phase line pole, and the conduction of the first phase switch is realized.
In this process, as the main shaft rotates in the clockwise direction, the first neutral switch movable contact driving cam 43 and the second neutral switch movable contact driving cam 53 also rotate in the clockwise direction. During this time, the third pin 441 moves from the first portion to the second portion of the first cam groove 431, and the fourth pin 541 relatively moves within the third portion of the second cam groove 531. As described above, since the arc radius of the second portion is smaller than the distance between the third pin 441 and the rotation center, and the arc radius of the third portion is equal to the distance between the fourth pin 541 and the rotation center, the first link 44 pulls the first neutral switch moving contact support, and the second link 54 does not push the second neutral switch moving contact support, so that the first neutral switch moving contact support rotates clockwise, and the first neutral switch moving contact rotates clockwise, and thus the first neutral switch moving contact is separated from contact with the static contact of the first power source and the static contact of the load-side neutral pole, so that the second neutral switch is kept on, and the first neutral switch is turned off.
Similarly, those skilled in the art will understand the kinematic relationship of the components when the spindle is rotated in the counterclockwise direction in this case, and will not be described in detail herein.
The technical features disclosed above are not limited to the combinations with other features disclosed, and other combinations between the technical features can be performed by those skilled in the art according to the purpose of the invention, so as to achieve the purpose of the invention.
Referring next to fig. 11-13, which illustrate a first neutral switch and a second neutral switch according to another embodiment of the present invention, the first phase switch and the second phase switch are identical to the previous embodiments and will not be described again.
As shown in fig. 11, a first resilient element 61 is connected between the first neutral switch and the housing and a second resilient element 62 is connected between the second neutral switch and the housing such that in the position shown in fig. 11 the first and second resilient elements bias the first and second neutral switches, respectively, towards the on position. The third lever 7 is pivotally mounted to the main shaft 1, is able to rotate with the rotation of the main shaft,
the first neutral switch includes a first neutral switch movable contact 41 pivotally mounted on a first neutral switch movable contact bracket 42, the first neutral switch movable contact bracket 42 being pivotally mounted on the housing. One end of the fourth rod 81 is fixedly connected to one end of the third rod 7, and the other end has a fourth groove 82, and the fifth pin 421 of the first neutral switch movable contact support 42 is received in the fourth groove 82.
The second neutral switch includes a second neutral switch movable contact 51 pivotally mounted on a second neutral switch movable contact support 52, the second neutral switch movable contact support 52 being pivotally mounted on the housing. One end of the fifth rod 91 is fixedly connected to the other end of the third rod 7, the other end of the fifth rod has a fifth groove 92, and the sixth pin 521 of the second neutral switch movable contact support 52 is accommodated in the fifth groove 92.
When the main shaft is in the middle position, the first phase line switch and the second phase line switch are in the cut-off position, and the first neutral line switch and the second neutral line switch are in the conducting position. When the main shaft is rotated in the forward direction, the third lever 7 is also rotated in the clockwise direction, thereby moving the fourth lever 81 such that the fifth pin 421 abuts against one end of the fourth groove 82, and the fifth lever 91 such that the sixth pin 521 does not abut against either end of the fifth groove 92. As the third rod 7 rotates further, the third rod 7 pushes the first neutral switch moving contact support 41 and thus the first neutral switch moving contact 42 to rotate in the counterclockwise direction, so that the first neutral switch moving contact is separated from the contact with the fixed contact of the first power source and the fixed contact of the load-side neutral pole, and the second neutral switch is kept on, and the first neutral switch is changed from on to off, which can be seen in fig. 11 to 12.
In this case, when the main shaft rotates in the counterclockwise direction, the skilled person should consider the motion relationship of the components, and the description is omitted here.
Referring to fig. 11 and 13, when the main shaft is rotated in the counterclockwise direction, the third lever 7 is also rotated in the counterclockwise direction, thereby moving the fifth lever 91 such that the sixth pin 521 abuts against one end of the fifth groove 92, and the fourth lever 81 such that the fifth pin 421 does not abut against either end of the fourth groove 82. With further rotation of the fifth lever 91, the fifth lever pushes the second neutral switch moving contact support and thus the second neutral switch moving contact to rotate clockwise, so that the second neutral switch moving contact is separated from contact with the static contact of the second power supply and the static contact of the load-side neutral line pole, the first neutral switch is kept on, and the second neutral switch is changed from on to off.
In this case, when the main shaft rotates in the clockwise direction, the skilled person should consider the kinematic relationship of the components, and the description is omitted here.
The above embodiments are only for illustrating the present disclosure and not for limiting the present disclosure, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so that all equivalent technical solutions also belong to the scope of the present disclosure, and the scope of the present disclosure should be defined by the claims.
Claims (18)
1. A dual power transfer switch comprising:
a load side phase line pole, one end of which is electrically connected with the load phase line;
a first phase line switch, one end of which is electrically connected with the other end of the load side phase line pole and selectively turns on or off the electrical connection of the first phase line pole and the first power supply;
a second phase line switch having one end electrically connected to the other end of the load side phase line pole and selectively turning on or off the electrical connection of the second phase line pole to the second power supply;
a load-side neutral line pole having one end electrically connected to the load neutral line;
a first neutral switch having one end electrically connected to the other end of the load-side neutral pole and selectively turning on or off the electrical connection of the first neutral pole to the first power source;
a second neutral switch having one end electrically connected to the other end of the load-side neutral wire pole and selectively turning on or off the electrical connection of the second neutral wire pole to the second power source,
the main shaft is pivotally arranged on the shell of the dual power supply changeover switch, so that the rotation of the main shaft can enable the first phase line switch, the second phase line switch, the first neutral line switch and the second neutral line switch to perform corresponding actions to switch on or switch off,
wherein when the first phase line switch and the second phase line switch are both off, the first neutral line switch and the second neutral line switch are both on,
wherein, when the first power supply starts to supply power, the first phase line switch immediately starts to switch to the conducting position, the second neutral line switch starts to switch to the cut-off position later than the switching time of the first phase line switch, and finally, at the moment that the first phase line switch is conducted, the second neutral line switch is cut off,
when the second power supply starts supplying power, the second phase line switch immediately starts switching to the on position, the first neutral line switch starts switching to the off position later than the switching time of the second phase line switch, and finally the first neutral line switch is turned off at the moment when the second phase line switch is turned on.
2. The dual power transfer switch of claim 1, wherein the first neutral switch and the second neutral switch are oppositely disposed with respect to the main shaft, a resilient member is connected between the first neutral switch and the second neutral switch to bias the first neutral switch and the second neutral switch toward the on position,
the first neutral line switch includes:
the first neutral switch moving contact is pivotally arranged on the first neutral switch moving contact support, the first neutral switch moving contact support is pivotally arranged on the shell, and the first neutral switch moving contact can pivot according to the pivoting of the main shaft to be in contact with or separated from a static contact of a first power supply and a static contact of a load side neutral line pole, so that the first power supply is switched on or switched off;
the moving contact of the first neutral line switch drives the cam, is fixedly arranged on the main shaft and can rotate along with the main shaft;
a first link having one end hinged to the first neutral switch movable contact carrier and the other end surrounding the pivot center of the main shaft, and a third pin disposed in a first cam groove of the first neutral switch movable contact driving cam to relatively move along the first cam groove when the main shaft pivots,
the second neutral line switch includes:
the second neutral switch moving contact is pivotally arranged on a second neutral switch moving contact support which is pivotally arranged on the shell, and can pivot to be in contact with or separated from a static contact of a second power supply and a static contact of a load side neutral line pole according to the pivoting of the main shaft, so that the second power supply is switched on or switched off;
the moving contact of the second neutral line switch drives the cam, is fixedly arranged on the main shaft and can rotate along with the main shaft,
a second connecting rod, one end of which is hinged on the second neutral switch moving contact bracket, the other end of which surrounds the pivot center of the main shaft, and a fourth pin is arranged in a second cam groove of the second neutral switch moving contact driving cam so as to move along the second cam groove relatively when the main shaft pivots,
the first cam groove and the second cam groove are configured such that when the main shaft rotates in a first direction and a second direction opposite to the first direction, the third pin and the fourth pin can respectively and relatively move in the first cam groove and the second cam groove, so that the first neutral wire switch movable contact support and the second neutral wire switch movable contact support respectively perform corresponding actions to realize the on and off of the first neutral wire switch and the second neutral wire switch.
3. The dual power transfer switch of claim 2,
wherein the first cam slot includes a first portion and a second portion, an arc radius of the first portion is equal to a distance between the third pin and a rotation center, the arc radius of the first portion is different from the arc radius of the second portion, so that when the main shaft rotates in the second direction and the first neutral switch is switched from the on position to the off position, the third pin can push or pull the first neutral switch moving contact bracket, and further push or pull the first neutral switch moving contact to contact or separate the first neutral switch moving contact with or separate from the static contact of the first power supply and the static contact of the load side neutral pole,
the second cam groove comprises a third part and a fourth part, the arc radius of the third part is equal to the distance between the fourth pin and the rotation center, the arc radius of the third part is different from the arc radius of the fourth part, so that when the main shaft rotates along the first direction, and the second neutral line switch is switched from the on position to the off position, the fourth pin can push or pull the second neutral line switch moving contact support, and further push or pull the second neutral line switch moving contact, so that the second neutral line switch moving contact is in contact with or separated from the static contact of the second power supply and the static contact of the load side neutral line pole.
4. The dual power transfer switch of claim 3, wherein the first neutral switch and the second neutral switch are both in an on position when the main shaft is in the neutral position and the first phase switch and the second phase switch are in an off position, the first phase switch immediately begins switching to the on position when the main shaft is rotated in the first direction, and the first neutral switch movable contact drives the cam and the second neutral switch movable contact drives the cam to rotate in the first direction such that the third pin moves along the first portion of the first cam slot and the fourth pin moves from the third portion to the fourth portion of the second cam slot, the first link does not push or pull the first neutral switch bracket because the first portion has an arc radius equal to the distance of the third pin from the center of rotation and the fourth portion has an arc radius different from the distance of the fourth pin from the center of rotation, the second connecting rod does not push or pull the second neutral line switch moving contact support during the movement of the fourth pin along the third portion and pushes or pulls the second neutral line switch moving contact support during the movement of the fourth pin along the fourth portion, so that the second neutral line switch moving contact support rotates in the first direction, the second neutral line switch moving contact is separated from contact with the static contact of the second power supply and the static contact of the load side neutral line pole, the first neutral line switch is kept on, and the second neutral line switch is turned off.
5. The dual power transfer switch of claim 4, wherein the second link urges the second neutral switch movable contact carrier to rotate in the first direction when the fourth portion has an arc radius greater than an arc radius of the third portion and the second link has one end hinged to the third end of the second neutral switch movable contact carrier.
6. The dual power transfer switch of claim 4, wherein the second link pulls the second neutral switch movable contact carrier to rotate in the first direction when the fourth portion has an arc radius less than an arc radius of the third portion and the second link has one end hinged to the fourth end of the second neutral switch movable contact carrier.
7. The dual power transfer switch of claim 4, wherein when the main shaft rotates in the second direction, the first phase switch immediately begins to switch to the off position, and simultaneously the first neutral switch movable contact drive cam and the second neutral switch movable contact drive cam rotate in the second direction, such that the third pin moves along the first portion of the first cam slot and the fourth pin disengages from the fourth portion of the second cam slot and enters the third portion, and wherein the first link does not push or pull the first neutral switch movable contact carrier and the second link pushes or pulls the second neutral switch movable contact carrier, such that the second neutral switch movable contact carrier rotates in the second direction, because the arc radius of the first portion is equal to the distance of the third pin from the center of rotation and the arc radius of the fourth portion is different from the distance of the fourth pin from the center of rotation, and the moving contact of the second neutral line switch rotates along the second direction, so that the moving contact of the second neutral line switch is contacted with the static contact of the second power supply and the static contact of the load side neutral line pole, the first neutral line switch is kept conducted, and the second neutral line switch is changed from being cut off to being conducted.
8. The dual power transfer switch of claim 7, wherein the second link pulls the second neutral switch movable contact carrier to rotate in the second direction when the arc radius of the fourth portion is greater than the arc radius of the third portion and the one end of the second link is hinged to the third end of the second neutral switch movable contact carrier.
9. The dual power transfer switch of claim 7, wherein the second link urges the second neutral switch movable contact carrier to rotate in the second direction when the fourth portion has an arc radius less than an arc radius of the third portion and the second link has one end hinged to the fourth end of the second neutral switch movable contact carrier.
10. The dual power transfer switch of claim 3, wherein the first neutral switch and the second neutral switch are both in an on position when the main shaft is in the neutral position and the first phase switch and the second phase switch are in an off position, the second phase switch immediately beginning to switch to the on position when the main shaft is rotated in the second direction while the first neutral switch movable contact drive cam and the second neutral switch movable contact drive cam are rotated in the second direction such that the third pin moves from the first portion to the second portion of the first cam slot and the fourth pin moves along the third portion of the second cam slot, the first link not pushing or pulling the first neutral switch movable contact holder during movement of the third pin along the first portion to move the third pin along the second portion because the arc radius of the second portion is not equal to the distance of the third pin from the center of rotation and the arc radius of the third portion is equal to the distance of the fourth pin from the center of rotation And during the period, the first neutral line switch moving contact support can be pushed or pulled, and the second connecting rod can not push or pull the second neutral line switch moving contact support, so that the first neutral line switch moving contact support rotates along the second direction, and the first neutral line switch moving contact rotates along the second direction, and is separated from the contact with the static contact of the first power supply and the static contact of the load side neutral line pole, so that the first neutral line switch is cut off, and the second neutral line switch is kept on.
11. The dual power transfer switch of claim 10, wherein the first link urges the first neutral switch movable contact carrier to rotate in the second direction when the second portion has an arc radius greater than an arc radius of the first portion and the first link has one end hinged to the first end of the first neutral switch movable contact carrier.
12. The dual power transfer switch of claim 10, wherein the first link pulls the first neutral switch movable contact carrier to rotate in the second direction when the second portion has an arc radius less than an arc radius of the first portion and the first link has one end hinged to the second end of the first neutral switch movable contact carrier.
13. The dual power transfer switch of claim 10, wherein when the main shaft rotates in a first direction, the second phase switch immediately begins to switch to the off position, and simultaneously the first neutral switch movable contact drive cam and the second neutral switch movable contact drive cam rotate in the first direction, causing the third pin to disengage from the second portion of the first cam slot and enter the first portion, and the fourth pin to move along the third portion of the second cam slot, the first link pushing or pulling the first neutral switch movable contact bracket and the second link not pushing or pulling the second neutral switch movable contact bracket, thereby causing the first neutral switch movable contact bracket to rotate in the first direction, because the arc radius of the second portion is not equal to the distance of the third pin from the center of rotation and the arc radius of the third portion is equal to the distance of the fourth pin from the center of rotation, and then the moving contact of the first neutral line switch rotates along the first direction, so that the moving contact of the first neutral line switch is contacted with the static contact of the first power supply and the static contact of the load side neutral line pole, the first neutral line switch is switched from off to on, and the second neutral line switch is kept on.
14. The dual power transfer switch of claim 13, wherein the first link pulls the first neutral switch movable contact carrier to rotate in a first direction when the second portion has an arc radius greater than an arc radius of the first portion and the first link has one end hinged to the first end of the first neutral switch movable contact carrier.
15. The dual power transfer switch of claim 13, wherein the first link urges the first neutral switch movable contact carrier to rotate in a first direction when the second portion has an arc radius less than an arc radius of the first portion and the first link has one end hinged to the second end of the first neutral switch movable contact carrier.
16. The dual power transfer switch of claim 1, wherein the first neutral switch and the second neutral switch are oppositely disposed with respect to the main shaft, the first resilient member is connected between the first neutral switch and the housing, the second resilient member is connected between the second neutral switch and the housing such that the first neutral switch and the second neutral switch respectively bias the first neutral switch and the second neutral switch toward the conducting position, the third lever is pivotally mounted to the main shaft for rotation with rotation of the main shaft,
the first neutral line switch includes:
the first neutral switch moving contact is pivotally arranged on the first neutral switch moving contact support, the first neutral switch moving contact support is pivotally arranged on the shell, and the first neutral switch moving contact can pivot according to the pivoting of the main shaft to be in contact with or separated from a static contact of a first power supply and a static contact of a load side neutral line pole, so that the first power supply is switched on or switched off;
a fourth rod, one end of which is fixedly connected with one end of the third rod, the other end of which is provided with a fourth groove, a fifth pin of the moving contact bracket of the first neutral switch is accommodated in the fourth groove,
the second neutral line switch includes:
the second neutral switch moving contact is pivotally arranged on a second neutral switch moving contact support which is pivotally arranged on the shell, and can pivot to be in contact with or separated from a static contact of a second power supply and a static contact of a load side neutral line pole according to the pivoting of the main shaft, so that the second power supply is switched on or switched off;
and one end of the fifth rod is fixedly connected to the other end of the third rod, the other end of the fifth rod is provided with a fifth groove, and a sixth pin of the second neutral switch moving contact support is accommodated in the fifth groove.
17. The dual power transfer switch of claim 16, wherein when the main shaft is in the neutral position and the first phase switch and the second phase switch are in the off position, the first neutral switch and the second neutral switch are both in an on position, and when the spindle is rotated in a second direction, the third lever is also rotated in the second direction, such that the fourth rod moves such that the fifth pin abuts one end of the fourth slot and the fifth rod moves such that the sixth pin does not abut either end of the fifth slot, the third rod urging the first neutral switch movable contact carrier and thus the first neutral switch movable contact to rotate in the first direction as the third rod is further rotated, therefore, the moving contact of the first neutral line switch is separated from the contact with the fixed contact of the first power supply and the fixed contact of the load side neutral line pole, the second neutral line switch is kept conducted, and the first neutral line switch is changed from conduction to cut-off.
18. The dual power transfer switch of claim 16, wherein when the main shaft is in the neutral position and the first phase switch and the second phase switch are in the off position, the first neutral switch and the second neutral switch are both in an on position, and when the spindle is rotated in a first direction, the third lever is also rotated in the first direction, such that the fifth rod moves such that the sixth pin abuts one end of the fifth slot and the fourth rod moves such that the fifth pin does not abut either end of the fourth slot, the fifth rod urging the second neutral switch movable contact support and thus the second neutral switch movable contact to rotate in the second direction as the fifth rod is further rotated, therefore, the moving contact of the second neutral line switch is separated from the contact with the fixed contact of the second power supply and the fixed contact of the load side neutral line pole, so that the first neutral line switch is kept on, and the second neutral line switch is changed from on to off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810018490.6A CN110021485B (en) | 2018-01-09 | 2018-01-09 | Double-power-supply change-over switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810018490.6A CN110021485B (en) | 2018-01-09 | 2018-01-09 | Double-power-supply change-over switch |
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| CN110021485A CN110021485A (en) | 2019-07-16 |
| CN110021485B true CN110021485B (en) | 2021-01-22 |
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| CN201810018490.6A Active CN110021485B (en) | 2018-01-09 | 2018-01-09 | Double-power-supply change-over switch |
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| CN207925334U (en) * | 2018-01-09 | 2018-09-28 | 施耐德电器工业公司 | Dual-power transfer switch |
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| US7462791B1 (en) * | 2006-04-14 | 2008-12-09 | Reliance Controls Corporation | Interlock assembly for sequentially actuating power supply switches including a neutrally connected switch |
| CN103700519A (en) * | 2013-12-25 | 2014-04-02 | 施耐德万高（天津）电气设备有限公司 | Automatic conversion switching device with neutral pole overlapping and switching functions |
| CN205069433U (en) * | 2015-06-04 | 2016-03-02 | 施耐德电器工业公司 | Double -power transfer switch |
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