CN115000817B - Ring main unit and its three-position switch - Google Patents
Ring main unit and its three-position switch Download PDFInfo
- Publication number
- CN115000817B CN115000817B CN202110227281.4A CN202110227281A CN115000817B CN 115000817 B CN115000817 B CN 115000817B CN 202110227281 A CN202110227281 A CN 202110227281A CN 115000817 B CN115000817 B CN 115000817B
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- contact
- input shaft
- moving contact
- mechanism input
- grounding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/015—Boards, panels, desks; Parts thereof or accessories therefor
- H02B1/04—Mounting thereon of switches or of other devices in general, the switch or device having, or being without, casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
Abstract
本公开提供一种环网柜及其三工位开关，该环网柜包括三工位开关，该三工位开关包括机构输入轴和至少一开关单元。开关单元包括拐臂板、接地触头、绝缘连接板和动触头。拐臂板与机构输入轴固定连接且能够随机构输入轴转动而转动，其具有第一端和第二端。接地触头与拐臂板的第一端连接，绝缘连接板其一端连接拐臂板的第二端。动触头其与所述绝缘连接板的另一端活动连接，动触头的第一端活动连接于动触头座，动触头的第二端为自由端，动触头和绝缘连接板的连接点位于动触头的第一端和动触头的第二端之间。当机构输入轴往接地合闸方向转动时，动触头与接地触头相对运动且均往合闸方向运动。
The present disclosure provides a ring network cabinet and a three-position switch thereof, wherein the ring network cabinet comprises a three-position switch, and the three-position switch comprises a mechanism input shaft and at least one switch unit. The switch unit comprises a crank plate, a grounding contact, an insulating connecting plate and a moving contact. The crank plate is fixedly connected to the mechanism input shaft and can rotate with the mechanism input shaft, and has a first end and a second end. The grounding contact is connected to the first end of the crank plate, and one end of the insulating connecting plate is connected to the second end of the crank plate. The moving contact is movably connected to the other end of the insulating connecting plate, the first end of the moving contact is movably connected to the moving contact seat, the second end of the moving contact is a free end, and the connection point between the moving contact and the insulating connecting plate is located between the first end of the moving contact and the second end of the moving contact. When the mechanism input shaft rotates in the grounding closing direction, the moving contact and the grounding contact move relative to each other and both move in the closing direction.
Description
Technical Field
The disclosure relates to the technical field of electrical equipment, in particular to a ring main unit and a three-station switch thereof.
Background
The three-station switch is used as an important element in a primary electric loop in the ring main unit, and is required to bear rated continuous current, rated short-time withstand current and rated closing current, and the requirements of reliable connection, high stability, small contact resistance and the like are met. The three-position switch integrates the functions of both the isolating switch and the grounding switch, and the mechanical locking is realized by one moving contact. The three stations are three working positions, namely a closing position where a main fracture of the isolating switch is connected, an isolating position where the main fracture is separated, and a grounding position of a grounding side. When the three-station switch is used for a grounding switch rated short-circuit switching-on current test, the switching-on speed of the grounding part is required to be improved, however, the traditional three-station switch is used for improving the switching-on speed of the grounding part by increasing the operation work of an operating mechanism of the three-station switch, and the service lives of the operating mechanism and the three-station switch are reduced, so that the stability of products is not facilitated.
Disclosure of Invention
In order to solve the problems of service life and stability reduction faced by the improvement of the closing speed of the grounding part by increasing the operation work of an operation mechanism in the related art, the present disclosure provides another ring main unit capable of improving the closing speed of the grounding part and a three-station switch thereof.
The present disclosure provides a three station switch, its characterized in that is applied to the looped netowrk cabinet, includes:
a mechanism input shaft which can be connected with the three-station operating mechanism and is driven by the three-station operating mechanism to rotate, and
At least one switching unit, each switching unit comprising:
The crank arm plate is fixedly connected with the mechanism input shaft and can rotate along with the rotation of the mechanism input shaft, and the crank arm plate is provided with a first end and a second end;
the grounding contact is connected with the first end of the crank arm plate;
One end of the insulating connecting plate is connected with the second end of the crank arm plate;
the movable contact is movably connected with the other end of the insulating connecting plate, a first end of the movable contact is movably connected with a movable contact seat, the movable contact seat can be fixed on a fixed frame, the fixed frame is fixed on the inner wall of the air box of the ring main unit, a second end of the movable contact is a free end, and a connecting point of the movable contact and the insulating connecting plate is positioned between the first end of the movable contact and the second end of the movable contact;
When the mechanism input shaft rotates towards the grounding closing direction, the moving contact and the grounding contact move relatively and move towards the closing direction.
Optionally, the area of the first end of the lever plate is larger than the area of the second end.
Optionally, the area of the lever plate gradually decreases from the first end to the second end.
Optionally, the distance from the connection point of the crank arm plate and the ground contact to the mechanism input shaft is smaller than the distance from the connection point of the crank arm plate and the insulation connection plate to the mechanism input shaft;
The pin shaft at the joint of the crank arm plate and the insulating connecting plate is in the same straight line with the mechanism input shaft, and the connection point of the first end of the crank arm plate and the grounding contact deviates from the straight line.
Optionally, the switch unit further includes an isolation static contact, the isolation static contact is fixed on an isolation contact seat, the isolation contact seat can be fixed on the fixed frame, and the second end of the moving contact can be electrically connected with the grounding contact or the isolation static contact under the drive of the mechanism input shaft;
When the three-station switch is grounded and opened, the first end of the crank arm plate drives the ground contact to rotate in a first direction when the mechanism input shaft rotates in the first direction, and the second end of the crank arm plate drives the moving contact to rotate in a second direction opposite to the first direction through the insulating connecting plate so as to enable the ground contact and the moving contact to move in the opening direction at the same time;
When the three-position switch performs grounding closing, the mechanism input shaft rotates in a second direction, the first end of the crank arm plate drives the grounding contact to rotate in the second direction, and the second end of the crank arm plate drives the moving contact to rotate in the first direction through the insulating connecting plate so that the moving contact and the grounding contact move in the closing direction at the same time.
Optionally, the isolating static contact is located on a path that the moving contact rotates in a first direction, and the grounding contact is located on a path that the moving contact rotates in a second direction.
Optionally, the moving contact and the insulating connecting plate are both in a strip shape, and a connection point of the moving contact and the insulating connecting plate is located at the middle position of the moving contact.
Optionally, the three-station switch further comprises a grounding busbar, and the grounding busbar is connected with the shell of the ring main unit through soft connection;
The ground contact is connected with the ground buss.
Optionally, the three-position switch is applied to a three-phase current switching device, each phase of current is correspondingly provided with one switching unit, and the crank arm plates of the switching units are arranged on the input shaft of the mechanism at intervals;
The ground contacts of each switch unit are connected with the ground bus.
The disclosure provides a ring main unit, which comprises an air box, the three-station switch arranged in the air box and a three-station operating mechanism arranged in a mechanism chamber;
a fixed frame is arranged on the inner wall of the gas tank, a moving contact seat of the three-station switch is fixed on the fixed frame, and insulating gas is filled in the gas tank;
the three-station operating mechanism is connected with the mechanism input shaft of the three-station switch and can drive the mechanism input shaft to rotate.
The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects:
The present disclosure provides a three-position switch, which includes a mechanism input shaft and at least one switch unit, where the mechanism input shaft can be connected with a three-position operating mechanism and rotate under the drive of the three-position operating mechanism. The switch unit comprises a crank arm plate, a grounding contact, an insulating connecting plate and a moving contact. The crank arm plate is fixedly connected with the mechanism input shaft and can rotate by randomly rotating the mechanism input shaft, and the crank arm plate is provided with a first end and a second end. The ground contact is connected with the first end of turning arm board, and its one end of insulating connecting plate connects the second end of turning arm board. The movable contact is movably connected with the other end of the insulating connecting plate, the first end of the movable contact is movably connected with the movable contact seat, the movable contact seat can be fixed on the fixed frame, the fixed frame is fixed on the inner wall of the air box of the ring main unit, the second end of the movable contact is a free end, and the connecting point of the movable contact and the insulating connecting plate is positioned between the first end of the movable contact and the second end of the movable contact. When the mechanism input shaft rotates in the grounding closing direction, the moving contact and the grounding contact move relatively and move in the closing direction. Because the grounding contact and the moving contact move relatively and move towards the grounding closing direction at the same time, the closing speed of the grounding contact and the moving contact is increased, the arcing time of an electric arc can be effectively reduced, the ablation of the contact is reduced, and the service life of a product is prolonged. Compared with the prior art that the switching-on speed is improved by increasing the operation work of the mechanism through increasing the energy of the spring and the like, the service lives of the operating mechanism and the three-station switch are prolonged, and the stability of products is improved.
The disclosure also provides a ring main unit, which comprises an air box, the three-station switch arranged in the air box, and the three-station operating mechanism arranged in the mechanism chamber. A fixed frame is arranged on the inner wall of the gas tank, a moving contact seat of the three-station switch is fixed on the fixed frame, and insulating gas is filled in the gas tank. The three-station operating mechanism is connected with the mechanism input shaft of the three-station switch and can drive the mechanism input shaft to rotate. Because the ring main unit of the present disclosure adopts the above three-position switch, the arc burning time of the three-position switch can be effectively reduced, contact ablation is reduced, and the service life of the product is prolonged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic perspective view showing a three-position switch in which a disconnecting switch portion and a grounding switch portion are both in a disconnecting state according to an exemplary embodiment.
Fig. 2 is a cross-sectional view showing a disconnecting switch portion and a grounding switch portion of a three-position switch in a disconnected state according to an exemplary embodiment.
Fig. 3 is a cross-sectional view showing a three-position switch with a disconnector portion in a closed state and a grounding switch portion in an open state, according to an exemplary embodiment.
Fig. 4 is a cross-sectional view showing a disconnecting switch portion of a three-position switch in a disconnected state and a grounding switch portion in a closed state according to an exemplary embodiment.
Detailed Description
For further explanation of the principles and structures of the present disclosure, preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.
The present disclosure provides a three-position switch that may be applied in a ring main unit. The ring main unit includes a housing divided into a plurality of compartments, such as a low pressure chamber, a mechanism chamber, an air box, a cable chamber, and the like. The ring main unit further comprises a breaker switch, a three-position switch and a three-position operating mechanism arranged in the gas box, wherein the gas box is filled with insulating gas, and the insulating gas can be sulfur hexafluoride gas for example. The three-station operating mechanism drives the three-station switch to act so as to realize grounding switching-on and switching-off or separation and separation of the switch.
As shown in fig. 1, the present disclosure provides a three-position switch 100, where the three-position switch 100 includes at least one switch unit 10 and a mechanism input shaft 20, and the mechanism input shaft 20 is connected to a three-position operating mechanism located in a mechanism room, and is driven by the three-position operating mechanism to rotate clockwise or counterclockwise around itself.
The three-position switch 100 may be used in a three-phase current switching device. As shown in fig. 1, the three-position switch 100 employs a switching device for three-phase current, and a switching unit 10 is provided corresponding to each phase, i.e., the three-position switch 100 has three switching units 10. Each switch unit 10 includes a lever plate 11, a ground contact 12, an insulating connection plate 13, and a moving contact 14. The ground contact 12 and the moving contact 14 of each switch unit 10 are arranged on the same mechanism input shaft 20 through respective crank arm plates 11, and all move under the drive of the mechanism input shaft 20. The lever plates 11 are provided at intervals on the mechanism input shaft 20.
The lever plate 11 is provided with an opening for the mechanism input shaft 20 to pass through. The lever plate 11 is fixedly connected to the mechanism input shaft 20 by welding, and is capable of rotating by rotating the mechanism input shaft 20. The lever plate 11 has a first end 11a and a second end 11b.
The lever plate 11 has a plate-like structure with one large end and the other small end. The lever plate 11 may have a double-layer structure. One end of the ground contact 12 is clamped between the two plates of the first end 11a of the lever plate 11 and is fixed by a fastener. The fastener may be a connecting bolt or screw, etc. One end of the insulating connecting plate 13 is clamped between the two plates of the second end 11b of the lever plate 11 and connected by a pin 111. The insulating connecting plate 13 can pivot about the pin 111 relative to the lever plate 11. An intersection angle is formed between the insulating connecting plate 13 and the crank arm plate 11, and the rotation of the input shaft 20 is randomly changed.
The area of the first end 11a of the lever plate 11 is larger than the area 11b of the second end, and the area of the lever plate 11 gradually decreases from the first end 11a to the second end 11 b. The pin 111 at the junction of the lever plate 11 and the insulating connecting plate 13 is in the same line as the mechanism input shaft 20, and the junction of the first end 11a of the lever plate 11 and the ground contact 12 deviates from the line. The distance from the connection point of the lever plate 11 and the ground contact 12 to the mechanism input shaft 20 is smaller than the distance from the connection point of the lever plate 11 and the insulating connection plate 13 to the mechanism input shaft 20.
The lever plate 13 of each corresponding switch unit 10 is connected to the mechanism input shaft 20.
The grounding contact 12 comprises a vertical portion and a transverse portion, wherein the vertical portion is connected with the lever plate 11 and is driven by the lever plate 11 to rotate. The vertical portion is connected to a ground strap 18. The ground strap 18 is connected to the housing of the ring main unit by a flexible connection, thereby providing a reliable ground. As shown in fig. 1, the three-position switch has three ground contacts 12, with the lateral portion of each ground contact 12 being connected to a ground buss bar 18.
As described above, one end of the insulating connecting plate 13 is connected to the second end 11b of the lever plate 11, and the other end of the insulating connecting plate 13 is connected to the moving contact 14 through the pin 143. The first end 141 of the moving contact 14 is movably connected to the moving contact seat 15. A fixed frame (not shown) is fixed on the inner wall of the gas tank of the ring main unit, the fixed frame comprises a plurality of supports, and the movable contact seat 15 is fixed on one of the supports of the fixed frame. The second end 142 of the moving contact 14 is a free end. The connection point of the moving contact 14 and the insulating connection plate 13 is located between the first end 141 and the second end 142 of the moving contact 14. Optionally, the connection point of the moving contact 14 and the insulating connection plate 13 is located at or near the middle position of the moving contact 14.
The insulating connecting plate 13 and the moving contact 14 are both long-strip-shaped. Alternatively, the insulating connecting plate 13 and the movable contact 14 may be of a double-layer plate structure.
The insulating connecting plate 13 forms an I shape with the lever plate 11 and the moving contact 14, and the insulating connecting plate 13 can twist relative to the lever plate 11 and the moving contact 14, namely, the included angle between the insulating connecting plate 13 and the lever plate 11 and the moving contact 14 is changed.
The switch unit 10 further includes an isolation static contact 16, the isolation static contact 16 is fixed on an isolation contact seat 17, the isolation contact seat 17 is fixed on another support of the fixed frame, the isolation contact seat 17 and the moving contact seat 15 can be located on the same vertical surface of the air box, and the moving contact seat 15 is located below the isolation contact seat 17. Furthermore, the isolating contact seat 17 and the moving contact seat 15 may be located on the bottom surface of the air box or on different sides of the air box.
The second end 142 of the moving contact 14 can be electrically connected to or disconnected from the isolating stationary contact 16 under the driving of the mechanism input shaft 20. The isolating fixed contact 16 is located on a path along which the moving contact 14 rotates in a first direction (e.g., clockwise), and the ground contact 12 is located on a path along which the moving contact 13 rotates in a second direction (e.g., counterclockwise) opposite to the first direction. Thus, when the moving contact 14 rotates around the first end 141 to a certain angle in the first direction, the second end 142 of the moving contact 14 is electrically connected with the isolating static contact 16, and when the moving contact 14 rotates around the first end 141 to a second direction and rotates to a certain angle, the second end 142 of the moving contact 14 is electrically connected with the grounding contact 12, so that the isolating brake is separated from the grounding brake.
When the mechanism input shaft 20 rotates, the crank arm plate 11 is driven to rotate, the crank arm plate 11 drives the ground contact 12 and the insulating connecting plate 13 to rotate, and the moving contact 14 moves in the opposite direction relative to the ground contact 12 under the pulling of the insulating connecting plate 13. Specifically, as shown in fig. 1 and 2, the three-position switch 100 is in an isolated switch-off state and a grounded switch-off state, when the isolating switch part is switched on, the mechanism input shaft 20 moves in a first direction (for example, clockwise), the mechanism input shaft 20 drives the lever plate 11 to rotate, the first end 11a of the lever plate 11 drives the ground contact 12 to rotate in the first direction, the second end 11b of the lever plate 11 drives the movable contact 14 around the first end 141 thereof through the insulating connecting plate 13 to rotate in a second direction (for example, anticlockwise) opposite to the first direction, that is, the second end 142 of the movable contact 14 is pushed by the insulating connecting plate 13 to approach the isolated fixed contact 16, and after rotating by a certain angle, the second end 142 of the movable contact 14 is in electrical contact with the isolated fixed contact 16, as shown in fig. 3, so as to realize isolated switch-on.
When the isolating switch part is separated, the mechanism input shaft 20 rotates in a second direction (namely anticlockwise direction), the electrified crank arm plate 11 rotates, the insulating connecting plate 13 drives the movable contact 14 to move in the isolating and separating direction, and the isolating switch part returns to the separating state as shown in fig. 2.
When the grounding switch portion is closed (at this time, the isolating switch portion and the grounding portion are both in a switching-off state), the mechanism input shaft 20 moves in a second direction (e.g., counterclockwise direction), the mechanism input shaft 20 drives the lever plate 11 to rotate, the first end 11a of the lever plate 11 drives the grounding contact 12 to rotate in the second direction, the second end 11b of the lever plate 11 drives the moving contact 14 to rotate around the first end 141 thereof in the first direction (e.g., clockwise direction) through the insulating connecting plate 13, that is, the second end 142 of the moving contact 14 approaches the grounding contact 12 under the pulling of the insulating connecting plate 13, and after rotating by a certain angle, as shown in fig. 4, the second end 142 of the moving contact 14 is in electrical contact with the grounding contact 12, so as to implement grounding closing. Because the grounding contact 12 and the moving contact 14 move relatively and move towards the grounding closing direction, the closing speed of the grounding contact 12 and the moving contact 14 is increased, the arcing time of an electric arc can be effectively reduced, the contact ablation is reduced, and the service life of a product is prolonged. Compared with the prior art that the switching-on speed is improved by increasing the operation work of the mechanism by increasing the energy of the spring and the like, the operating mechanism of the three-position switch and the service life of the three-position switch are prolonged, and the stability of products is improved.
When the ground switch portion is opened, the mechanism input shaft 20 rotates in a first direction (i.e., clockwise), driving the lever plate 11 to rotate, and simultaneously driving the ground contact 12 and the moving contact 14 of the lever plate 11 to move in the opening direction, i.e., the ground contact 12 rotates clockwise with the mechanism input shaft 20, and the moving contact 14 moves counterclockwise about the first end 141 thereof.
Because the moving contact 14 and the grounding contact 12 are driven to rotate by the same mechanism input shaft 20, the grounding switch part can be ensured to be in a switching-off state when the moving contact 14 and the isolation static contact 16 are switched on, and the isolation switch part can be in a switching-off state when the moving contact 14 and the grounding contact 12 are switched on, so that electrified grounding can be effectively prevented.
The moving contact 14 and the moving contact 12 move in opposite directions during the opening and closing process, respectively, and the opposite directions refer to that the moving contact 14 and the moving contact 12 move in opposite directions around respective rotation axes, for example, if the moving contact 14 moves counterclockwise around the first end 141 of the moving contact 12 if the moving contact 12 moves clockwise around the mechanism input shaft 20, and if the moving contact 14 moves counterclockwise around the first end 141 of the moving contact 14 if the moving contact 12 moves counterclockwise around the mechanism input shaft 20, so that the moving contact 12 and the moving contact 14 move relative to each other or move away from each other.
In summary, the ground contact and the moving contact of the three-position switch of the present disclosure are driven to rotate by the same mechanism input shaft, and the ground contact and the moving contact are driven to move in opposite directions, so that under the condition of meeting the interlocking requirement of the switch device, the closing speed of the moving contact and the ground contact can be further accelerated, the arc burning time is effectively reduced, and the contact ablation is reduced.
The foregoing is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure, but all equivalent structural changes made using the description and drawings of the present disclosure are included in the scope of the present disclosure.
Claims (10)
1. The utility model provides a three station switch which characterized in that is applied to the looped netowrk cabinet, includes:
a mechanism input shaft which can be connected with the three-station operating mechanism and is driven by the three-station operating mechanism to rotate, and
At least one switching unit, each switching unit comprising:
The crank arm plate is fixedly connected with the mechanism input shaft and can rotate along with the rotation of the mechanism input shaft, and the crank arm plate is provided with a first end and a second end;
the grounding contact is connected with the first end of the crank arm plate;
One end of the insulating connecting plate is connected with the second end of the crank arm plate;
the movable contact is movably connected with the other end of the insulating connecting plate, a first end of the movable contact is movably connected with a movable contact seat, the movable contact seat can be fixed on a fixed frame, the fixed frame is fixed on the inner wall of the air box of the ring main unit, a second end of the movable contact is a free end, and a connecting point of the movable contact and the insulating connecting plate is positioned between the first end of the movable contact and the second end of the movable contact;
When the mechanism input shaft rotates towards the grounding closing direction, the moving contact and the grounding contact move relatively and move towards the closing direction.
2. The three-position switch of claim 1, wherein the area of the first end of the lever plate is greater than the area of the second end.
3. The three-position switch of claim 2, wherein the area of the lever plate decreases from the first end to the second end.
4. The three-position switch of claim 1, wherein a distance from a connection point of the lever plate and the ground contact to the mechanism input shaft is less than a distance from a connection point of the lever plate and the insulating connection plate to the mechanism input shaft;
The pin shaft at the joint of the crank arm plate and the insulating connecting plate is in the same straight line with the mechanism input shaft, and the connection point of the first end of the crank arm plate and the grounding contact deviates from the straight line.
5. The three-position switch according to claim 1, wherein the switch unit further comprises an isolation fixed contact, the isolation fixed contact is fixed on an isolation contact seat, the isolation contact seat can be fixed on the fixed frame, and the second end of the moving contact can be electrically connected with the grounding contact or the isolation fixed contact under the drive of the mechanism input shaft;
When the three-station switch is grounded and opened, the mechanism input shaft rotates in a first direction, the first end of the crank arm plate drives the ground contact to rotate in the first direction, and the second end of the crank arm plate drives the moving contact to rotate in a second direction opposite to the first direction through the insulating connecting plate, so that the ground contact and the moving contact simultaneously move in the opening direction;
When the three-position switch performs grounding closing, the mechanism input shaft rotates in a second direction, the first end of the crank arm plate drives the grounding contact to rotate in the second direction, and the second end of the crank arm plate drives the moving contact to rotate in the first direction through the insulating connecting plate so that the moving contact and the grounding contact move in the closing direction at the same time.
6. The three-position switch of claim 5, wherein the isolation stationary contact is located on a path along which the movable contact rotates in a first direction, and the ground contact is located on a path along which the movable contact rotates in a second direction.
7. The three-position switch according to claim 1, wherein the moving contact and the insulating connecting plate are both in a long strip shape, and a connection point of the moving contact and the insulating connecting plate is located at a middle position of the moving contact.
8. The three-position switch of claim 1, further comprising a ground strap connected to the housing of the ring main unit by a flexible connection;
The ground contact is connected with the ground buss.
9. The three-position switch according to claim 8, wherein the three-position switch is applied to a three-phase current switching device, each phase current is correspondingly provided with one switching unit, and the crank arm plates of the switching units are arranged on the mechanism input shaft at intervals;
The ground contacts of each switch unit are connected with the ground bus.
10. A ring main unit, comprising an air box, the three-position switch of any one of claims 1-9 arranged in the air box, and a three-position operating mechanism arranged in a mechanism room;
A fixed frame is arranged on the inner wall of the gas tank, a moving contact seat of the three-position switch is fixed on the fixed frame, and insulating gas is filled in the gas tank;
the three-station operating mechanism is connected with the mechanism input shaft of the three-station switch and can drive the mechanism input shaft to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110227281.4A CN115000817B (en) | 2021-03-01 | 2021-03-01 | Ring main unit and its three-position switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110227281.4A CN115000817B (en) | 2021-03-01 | 2021-03-01 | Ring main unit and its three-position switch |
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| Publication Number | Publication Date |
|---|---|
| CN115000817A CN115000817A (en) | 2022-09-02 |
| CN115000817B true CN115000817B (en) | 2025-05-02 |
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| CN202110227281.4A Active CN115000817B (en) | 2021-03-01 | 2021-03-01 | Ring main unit and its three-position switch |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214227362U (en) * | 2021-03-01 | 2021-09-17 | 厦门华电开关有限公司 | Ring main unit and three-position switch thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204884992U (en) * | 2015-08-18 | 2015-12-16 | 中广核工程有限公司 | Three-position switch device |
| CN106384961B (en) * | 2016-11-12 | 2018-07-17 | 上海天灵开关厂有限公司 | A kind of gas insulated bus earthing or grounding means |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214227362U (en) * | 2021-03-01 | 2021-09-17 | 厦门华电开关有限公司 | Ring main unit and three-position switch thereof |
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| CN115000817A (en) | 2022-09-02 |
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