EP4300526A1 - Vacuum interrupter pole and its associated electrical device - Google Patents

Vacuum interrupter pole and its associated electrical device Download PDF

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Publication number
EP4300526A1
EP4300526A1 EP23182729.6A EP23182729A EP4300526A1 EP 4300526 A1 EP4300526 A1 EP 4300526A1 EP 23182729 A EP23182729 A EP 23182729A EP 4300526 A1 EP4300526 A1 EP 4300526A1
Authority
EP
European Patent Office
Prior art keywords
vacuum interrupter
top wall
pole
insulation
plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23182729.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Baoyi Zhang
Dongliang Zhang
Juan WEN
Jianbo Xie
Qi Zhang
Ru WANG
Pawel BAJERSKI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Publication of EP4300526A1 publication Critical patent/EP4300526A1/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H33/6661—Combination with other type of switch, e.g. for load break switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/6606—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • 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
    • H01H9/52—Cooling of switch parts
    • 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
    • H01H9/52—Cooling of switch parts
    • H01H2009/526—Cooling of switch parts of the high voltage switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact

Definitions

  • the present disclosure relates to the electrical field, and more specifically to a vacuum interrupter pole for a circuit breaker and its associated electrical device.
  • Circuit breaker (known as CB) is an electrical safety device for protecting the circuit from damage caused by overcurrent or short circuit.
  • CB Circuit breaker
  • the circuit breaker In addition to closing, bearing and cutting off current under normal loop conditions, the circuit breaker also can close, bear and cut off current under abnormal loop conditions within specified time.
  • a classic example of the circuit breaker is vacuum circuit breaker, which is known for its arc-extinguishing medium and insulation medium in the gap between contacts after an arc extinguishing operation being both high vacuum.
  • the vacuum circuit breaker is small and light weight and further adapted for frequent operations. Meanwhile, maintenance is not required for arc extinguishing.
  • the vacuum circuit breaker is extensively applied in the power distribution networks.
  • One of the objects of the present disclosure is to provide an improved vacuum interrupter pole and its associated electrical device, to at least solve the technical problems of the structure of existing circuit breakers including poor heat dissipation performance, environmental unfriendliness and/or low integration level.
  • a vacuum interrupter pole for a circuit breaker.
  • the vacuum interrupter pole comprises: a vacuum interrupter; an insulation supporting shell for accommodating and supporting the vacuum interrupter and having a top wall and side walls defining a U shape, wherein the vacuum interrupter is adapted to be placed within an interior space limited by the side walls via an opening side of the U shape; and a conductive connector with a first end and a second end, wherein the first end is fastened between the top wall and the vacuum interrupter and electrically connected to the vacuum interrupter, and the second end is adapted to act as a supporting point for a moving knife component of an isolation switch that is electrically connected with the circuit breakers.
  • thermosetting material e.g., epoxy resin
  • the top wall has a honeycomb structure. It is to be easily appreciated that the honeycomb structure has a relatively high impact resistance strength which can withstand the impact generated during the breaking or closing of the vacuum interrupter.
  • most of the honeycomb structure is formed by structural units with a pentagonal or hexagonal shape. In this way, the honeycomb structure may have a more satisfactory impact resistance strength.
  • the insulation supporting shell further comprises a mounting base disposed opposing to the top wall, and the side walls include a first side wall and a second side wall opposing to each other for defining the opening of the U shape, wherein a distance between the first side wall and the second side wall at a side proximate to the mounting base is smaller than a corresponding distance at a side proximate to the top wall .
  • the insulation supporting shell defines a necking-in structure proximate to the mounting base side, which is helpful to provide a sufficient mounting space and more easily meet the insulation requirement for the mounting bases of vacuum interrupter poles in a potential scenario that three vacuum interrupter poles for three phases are disposed in parallel.
  • the top wall has a thickness ranging from 20mm to 50mm and the side walls have a thickness smaller than 10mm.
  • the conductive connector includes a first plane and a second plane perpendicular to each other; the first plane is formed by the first end and the second plane is formed by the second end.
  • the conductive connector further includes a bending engagement surface serving as a transition between the first plane and the second plane.
  • the conductive connector is integrally formed.
  • the vacuum interrupter and the conductive connector are fastened together via a first bolt, which is arranged to be mounted by passing through a first mounting hole disposed at the middle of the first plane.
  • the conductive connector and the insulation supporting shell are fastened together via at least one second bolt, which is arranged to be mounted by passing through a top wall mounting hole of the top wall and a second mounting hole on the first plane in sequence, the second bolt being different from the first bolt. That is, in these embodiments, the vacuum interrupter, the conductive connector and the insulation supporting shell are not fastened together by a common bolt. In such a case, the stable electrical connection between the vacuum interrupter and the conductive connector can be secured even in the case of thermoplastic deformation of the insulation supporting shell.
  • the second mounting hole is formed by a circular platform protruding from the first plane, the circular platform having a height ranging from 1mm to 3mm with respect to the first plane, wherein in a state where the conductive connector and the insulation supporting shell are fastened together, a top surface of the circular platform abuts against a surrounding plane of the top wall on which the top wall mounting hole is formed.
  • the above arrangement avoids forming a wedge-shaped gap at the top wall mounting hole and which wedge-shaped gap may unfavorably cause gap discharge.
  • the at least one second bolt includes two second bolts, which are symmetrically arranged at both sides of the first bolt. In this way, the conductive connector and the insulation supporting shell are fastened in a much stronger manner.
  • the vacuum interrupter pole further comprises: an insulation plug with barbs, wherein the insulation plug is adapted to be inserted into the top wall mounting hole from outside of the insulation supporting shell to prevent discharge from the second bolt to components outside of the insulation supporting shell via the top wall mounting hole.
  • the side walls include an intermediate side wall for defining an intermediate segment of the U shape, the intermediate side wall being provided thereon with a plurality of holes; and an edge of the top wall adjacent to the opening side of the U shape is configured with a chamfer; during operation of the vacuum interrupter pole, ambient gas is adapted to enter the insulation supporting shell from the holes, then pass through a gap between the vacuum interrupter and the intermediate side wall and a gap between the vacuum interrupter and the top wall, and finally exit the insulation supporting shell from the position of the chamfer, thereby creating convection effect within the vacuum interrupter pole.
  • the vacuum interrupter pole further comprises: an insulation push-rod component coupled to an end of a moving conductive rod of the vacuum interrupter, wherein the insulation push-rod component is also adapted to be placed within the interior space via the opening side of the U shape.
  • the vacuum interrupter pole further comprises: a flexible connector with one end electrically connected to an end of a moving conductive rod of the vacuum interrupter and the other end passing through an intermediate side wall defining an intermediate segment of the U shape.
  • a circuit breaker comprising the vacuum interrupter pole according to the first aspect.
  • a switch device comprising the vacuum interrupter pole according to the first aspect.
  • an electrical cabinet comprising: a cabinet body and the vacuum interrupter pole according to the first aspect.
  • the vacuum interrupter pole is arranged within the cabinet body in a tilted manner with respect to the cabinet body.
  • the electrical cabinet further comprises: an auxiliary supporting beam that extends along a direction perpendicular to extension direction of the vacuum interrupter pole and supports the tilted vacuum interrupter pole.
  • the auxiliary supporting beam is made of insulated material. In this way, the possible discharge from the vacuum interrupter to the auxiliary supporting beam via the above holes is avoided.
  • the electrical cabinet is a gas-insulated ring main unit.
  • vacuum circuit breakers are extensively used in power distribution networks.
  • the vacuum interrupter pole for an existing circuit breaker is often fabricated by covering the vacuum interrupter with thermosetting material (such as epoxy resin).
  • thermosetting material such as epoxy resin
  • the circuit breaker is normally large, heavy and not environmental friendly and also underperform in heat dissipation.
  • the vacuum interrupter pole of the existing circuit breaker could not be effectively integrated with a three-position switch at the bus side.
  • the overall height of the electrical cabinet, such as the ring main unit is relatively high.
  • the idea of the present disclosure is to provide an improved vacuum interrupter pole for a circuit breaker.
  • the vacuum interrupter pole includes a vacuum interrupter; an insulation supporting shell for accommodating and supporting the vacuum interrupter and having a top wall and side walls defining a U shape, wherein the vacuum interrupter is adapted to be placed within an interior space limited by the side walls via an opening side of the U shape; and a conductive connector with a first end and a second end, wherein the first end is fastened between the top wall and the vacuum interrupter and electrically connected to the vacuum interrupter, and the second end is adapted to act as a supporting point for a moving knife component of an isolation switch that is electrically connected with the circuit breakers.
  • the above improved vacuum interrupter pole can be effectively integrated with the three-position switch at the bus side.
  • the heat dissipation performance of the vacuum interrupter pole may be improved by means of the above insulation supporting shell.
  • the insulation supporting shell may be made of environmental-friendly material, the disadvantage of the environmental unfriendliness can be avoided.
  • Fig. 1 illustrates a schematic view of the overall structure of the vacuum interrupter pole for a circuit breaker according to exemplary embodiments of the present disclosure.
  • the vacuum interrupter pole 1 mainly includes a vacuum interrupter 2, an insulation supporting shell 3, a conductive connector 4, a flexible connector 5 and an insulation push-rod component 6.
  • the vacuum interrupter 2 includes moving and static contacts (or moving and static electrodes) and is provided to rapidly extinguish arcs and suppress current by virtue of excellent vacuum insulation within its tube when the moving and static contacts are separated.
  • moving and static contacts or moving and static electrodes
  • the movement of the moving conductive rod 21 of the vacuum interrupter 2 coupled to the end of the moving contact is controlled by the operating mechanism of the circuit breaker, such that the moving and static contacts can be separated or engaged, thereby realizing the breaking or closing of the circuit breaker.
  • the conductive connector 4 is connected to the end of the vacuum interrupter 2 provided with the static contact, while the flexible connector 5 is connected to the moving conductive rod 21 of the vacuum interrupter 2 extending from the moving contact. In such a manner, the upper and lower ends of the vacuum interrupter pole 1 may be electrically connected.
  • one of its ends is also connected to the moving conductive rod 21 and the other end is connected to a transmission chain mechanism of the above operating mechanism. It can be easily understood that the acting force by the closing and opening operations of the operating mechanism may be transmitted to the insulation push-rod component 6 via the transmission chain mechanism. Further, by means of pulling up or down the insulation push-rod component 6, the moving and static contacts can be separated or engaged.
  • Figs. 2 and 3 respectively illustrate the structural views of the flexible connector 5 and the insulation push-rod component 6. It is to be noted that structures of the vacuum interrupter 2, the flexible connector 5 and the insulation push-rod component 6 are known in the art and will not be detailed herein. The description below will be focused on the structure and operating principle of the insulation supporting shell 3 and the conductive connector 4.
  • Figs. 4a to 4c respectively illustrate a back, front and top side perspective view of the insulation supporting shell according to exemplary embodiments of the present disclosure.
  • the insulation supporting shell 3 has a roughly cylindrical hollow shell structure.
  • the insulation supporting shell 3 may have side walls 30 and a top wall 34, wherein the side walls 30 may be constructed in a U shape and the top wall 34 may be positioned at one end of the side walls 30 and is basically vertical to the side walls 30.
  • the side walls 30, may include a first side wall 31 and a second side wall 33 opposing to each other, and an intermediate side wall 32 connecting the first side wall 31 with the second side wall 33, for defining an opening of the U shape. It is easily understood that with such a U-shaped opening, the vacuum interrupter 2 may be conveniently arranged within the interior space defined by the side walls 30 through the opening side of the U shape and then supported by the insulation supporting shell 3.
  • the insulation supporting shell 3 may further have a mounting base 37 at a side opposite to the top wall 34. Accordingly, the insulation supporting shell 3 may be secured, via the mounting base 37, to a beam 120 (shown in the subsequent Figs. 11a to 11d ) within a cabinet body of a gas-insulated ring main unit, for example.
  • the mounting base 37 may be designed to have four mounting holes.
  • three vacuum interrupter poles 1 for three phases may be mounted in parallel inside the cabinet body 110.
  • one side of the above U shape proximate to the mounting base 37 may be designed as a narrow necking-in structure (as shown in Fig. 4b ). That is, between the first side wall 31 and the second side wall 33, a distance at a side proximate to the mounting base 37 is smaller than a distance at a side proximate to the top wall 34.
  • the insulation supporting shell 3 has certain impact resistance strength to withstand the impact force generated during the breaking and closing of the vacuum interrupter 2.
  • the top wall 34 and the side wall 30 may be provided with reinforcing ribs. Further, it is easily understood that the top wall 34 withstands most of the impact as it is arranged in the axial direction of the vacuum interrupter 2.
  • the top wall 34 may be further designed to have a honeycomb structure. Particularly, most of the honeycomb structure may be formed by structural units with regular (e.g., pentagon, hexagon or other polygons with more sides) or irregular shapes.
  • the top wall 34 may be designed to have a thickness greater than the thickness of the side wall 30.
  • the thickness of the top wall may be in a range from 20mm to 50mm, while the side wall may have a thickness smaller than 10mm, such as around 5mm.
  • the insulation supporting shell 3 for example may be made of thermoplastic material. It is easily understood that the thermoplastic material is environmentally friendly, has excellent mechanical strength and can be easily shaped. In such a case, the insulation supporting shell 3 can be easily fabricated and may be recycled and reused.
  • a plurality of holes may be further disposed in a direction of the intermediate side wall 32 of the insulation supporting shell 3 away from the top wall 34.
  • a chamfer 35 may be arranged at an edge of the top wall 34 adjacent to the opening side of the U shape.
  • the intermediate side wall 34 of the insulation supporting shell 3 is further provided with a hole through which the flexible connector 4 is allowed to pass.
  • one end of the flexible connector 4 may be electrically connected to the moving conductive rod 21 of the vacuum interrupter, and the other end may pass through the hole disposed on the intermediate side wall 34.
  • the other end of the flexible connector 4 may be further fixed on a protrusion 39 provided on the intermediate side wall 34. In this way, a stable electrical connection may be established between the flexible connector 4 and the moving conductive rod 21 of the vacuum interrupter.
  • Figs. 5a to 5d respectively illustrate different angular and perspective views of the conductive connector according to exemplary embodiments of the present disclosure
  • Figs. 6a to 6b respectively illustrate partial and sectional views for the connection of the conductive connector with both of the vacuum interrupter and the insulation supporting shell according to exemplary embodiments of the present disclosure
  • Fig. 7 illustrates a schematic structural view of the connection between the conductive connector and the moving knife of the isolation switch according to exemplary embodiments of the present disclosure
  • Figs. 8a to 8d respectively illustrate different angular views of an insulation plug according to exemplary embodiments of the present disclosure.
  • the conductive connector 4 is constructed in an abnormal shape and has a first end 41 and a second end 42, wherein the first end 41 is fastened between the top wall 34 and the vacuum interrupter 2 and is electrically connected to the end of the vacuum interrupter 2 with the static contact, while the second end 42 is constructed to be adapted to act as a supporting point for the moving knife component 9 of the isolation switch (see Fig. 7 ).
  • the isolation switch for example may be a three-position isolation grounding switch located upstream of the circuit breaker.
  • the moving knife component 9 may move to the three different positions to fulfill grounding, closing and opening operations of the isolation switch.
  • the conductive connector 4 in the abnormal shape may be further constructed to include a first plane 43 and a second plane 44 perpendicular to each other as shown in Figs. 5a to 5d , wherein the first end 41 is formed by the first plane 43 and the second end 42 is formed by the second plane 44.
  • the conductive connector 4 in the abnormal shape is integrally formed, e.g., by copper-forging process.
  • an engagement surface between the first plane 43 and the second plane 44 may be designed as required.
  • a bending surface 49 acting as a transition between the first plane 43 and the second plane 44 may be used as the above engagement surface.
  • the edge of the second end 42 may be designed as a rounded corner to lower the intensity of the surrounding electrical field and further meet the requirement for insulation performance.
  • a first mounting hole 46 may be formed at the first end 41 of the conductive connector 14.
  • the first mounting hole 46 may be located in an intermediate region of the first end.
  • the conductive connector 4 may be fastened, via a first bolt 61, to the end of the vacuum interrupter 2 with the static contact, wherein the first bolt 61 is mounted by passing through the above first mounting hole 46. It is easily understood that the conductive connector 4 may be fastened with the vacuum interrupter 2 by the above manner, so as to provide stable electrical connection with the end of the vacuum interrupter 2 with the static contact.
  • the conductive connector 4 may also be provided with at least one second mounting hole 47 at the first end 41.
  • the at least one second mounting hole 47 may include two second mounting holes 47, which may be symmetrically arranged at both sides of the first mounting hole 46 on the first plane 43.
  • the conductive connector 4 may be fastened to the top wall 34 via a second bolt 62, wherein the top wall 34 is correspondingly configured with a top wall mounting hole 341, and at least one second bolt 62 is arranged such that it is mounted by passing through the top wall mounting hole 341 on the top wall 34 and the second mounting hole 47 on the first plane in sequence.
  • the number of the above at least one second bolt 62 corresponds to the number of the top wall mounting hole 341, and also corresponds to the number of the at least one second mounting hole 47.
  • two corresponding second bolts 67 are symmetrically configured at both sides of the first bolt 61.
  • the above second mounting hole 47 may be formed within a circular platform 48 protruding from the first plane 43 and the second mounting hole 47 may be positioned at the middle of the circular platform 58.
  • the relative height of the circular platform 48 with respect to the first plane 43 may range from 1mm to 3mm.
  • a top face of the above circular platform 48 would abut against a surrounding plane of the top wall 34 on which the top wall mounting hole 341 is formed.
  • the number of the above circular platform 48 may correspond to the number of the second mounting hole 47, e.g., two. It is easily appreciated that the above manner may avoid forming a wedge-shaped gap between a conductive face of the conductive connector 4 and the abutting plane of the above insulation supporting shell 3, and which wedge-shaped gap may unfavorably cause gap discharge.
  • the vacuum interrupter 2 is connected with the conductive connector 4 via the first bolt 61 and the conductive connector 4 is connected with the insulation supporting shell 3 via the second bolt 62 different from the first bolt 61. It is easily understood that the above manner secures a stable electrical connection between the vacuum interrupter 2 and the conductive connector 4 even in case of thermoplastic deformation of the insulation supporting shell 3.
  • the vacuum interrupter pole 1 in an embodiment where the top wall mounting hole 341 is provided, the head of the first bolt 62 would expose from the top wall mounting hole 341.
  • the vacuum interrupter pole 1 may further include an insulation plug 8 as shown in Fig. 8a , which for example is made of silicone and adapted to be inserted into the top wall mounting hole 341 from the outside of the insulation supporting shell.
  • the insulation plug 8 may consist of a plug cap 81 and a plug column 82 as shown in Figs. 8b to 8d , wherein the plug column 82 is adapted to be inserted into the top wall mounting hole 341 while the plug cap 81 is configured to engage with the edge of the top wall mounting hole 341, to avoid excessive insertion of the insulation plug 8.
  • the edge of the plug cap 81 is foldable as shown in Figs. 8c and 8d .
  • the plug column 82 may have a barbed or inverted triangle structure, which may facilitate the insertion of the insulation plug 8 and also prevent back-off under impact.
  • the insulation supporting shell 3 of the present disclosure may be provided with the holes 36 and the chamfer 35, which may facilitate a good heat dissipation for the vacuum interrupter pole 1.
  • Fig. 9 illustrates a schematic view of the convection current inside the vacuum interrupter pole 1 according to exemplary embodiments of the present disclosure
  • Figs. 10a to 10b illustrate experiment diagrams for the temperature rise and thermodynamic simulation of the vacuum interrupter pole according to exemplary embodiments of the present disclosure.
  • the ambient gas is adapted to enter the insulation supporting shell 3 from the holes 36, then pass through the gap between the vacuum interrupter 2 and the intermediate side wall 32 and the gap between the vacuum interrupter 2 and the top wall 34, and finally exit the insulation supporting shell 3 from the position of the chamfer 35, thereby creating a similar convection path in the vacuum interrupter pole as well as a convection effect analogous to a chimney effect. It is also confirmed in the experiment diagrams shown in Figs. 10a to 10b that the design of the insulation supporting shell 3 of the present disclosure achieves a good convection and associated heat dissipation effect.
  • the circuit breaker may be correspondingly provided with one or more of the above vacuum interrupter poles, so as to take advantage of the vacuum interrupter pole 1 according to the present disclosure.
  • the circuit breaker may be configured as a single-phase circuit breaker or a multi-phase circuit breaker.
  • the vacuum interrupter pole 1 may also be a part of a switching device or an electrical cabinet including the circuit breaker.
  • FIGs. 11a to 11d respectively illustrate a schematic structural view of the electrical cabinet including a three-phase circuit breaker, wherein the electrical cabinet, for example, may be gas-insulated ring main unit.
  • the electrical cabinet 100 may include a cabinet body 110.
  • the cabinet 110 may, for example, be filled with insulated gas such as sulfur hexafluoride, dry air or nitrogen.
  • three vacuum interrupter poles 1 for three phases may be disposed in parallel inside the cabinet body 110.
  • the height of the cabinet body 110 may be restricted. Therefore, the vacuum interrupter poles 1 may be mounted inside the cabinet body 110 in a tilted manner as shown in the drawings. In this way, the overall height of the cabinet body 110 may be effectively controlled.
  • the lower end of the vacuum interrupter poles 1 for three phases may be secured to a beam 120 (e.g., a U-shaped beam) of the cabinet body 110 via the bottom of the insulation supporting shells 3, while the transmission chain mechanism (not shown) of the circuit breaker may be disposed below the beam 120.
  • One end of the transmission chain mechanism may be connected to the operating mechanism of the circuit breaker, while the other end may be connected to the moving conductive rods 21 of the vacuum interrupter poles 1 for three phases, thereby realizing the closing and opening operations of the circuit breaker.
  • the insulation supporting shell 3 may further include a protrusion 38 extending outward from the intermediate side wall 34.
  • the cabinet body 110 may further consist of an auxiliary supporting beam 130 (e.g., an L-shaped beam) that extends along a direction perpendicular to the extension direction of the vacuum interrupter pole 1.
  • the above protrusion 38 may be such arranged to allow the auxiliary supporting beam 130 to abut below the protrusion 38, to provide auxiliary support for the vacuum interrupter pole 1.
  • the auxiliary supporting beam 130 may be fastened together by means of a bolt and the protrusion 38.
  • the auxiliary supporting beam 130 may be made of insulation material, to prevent discharge from the vacuum interrupter pole 1 to the auxiliary supporting beam 130 via the above holes 36.
  • the vacuum interrupter pole 1 and relevant electrical device according to the present disclosure have been described in detail. It is easily appreciated that the vacuum interrupter pole of the present disclosure has a simple structure and a small size. In addition, the vacuum interrupter pole is stable and environmentally friendly, and has an enhanced mechanical strength and a good heat dissipation performance. Moreover, the unique conductive connector according to the present disclosure may effectively form an electrical connection loop and also support the moving knife component of the upstream three-position isolation grounding switch. Thus, the vacuum interrupter pole 1 of the present disclosure can more easily meet the requirement for arranging a three-position switch at the bus side, thereby improving the integration level of the entire electrical cabinet, such as a main ring unit.

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EP23182729.6A 2022-06-30 2023-06-30 Vacuum interrupter pole and its associated electrical device Pending EP4300526A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210767562.3A CN115172094A (zh) 2022-06-30 2022-06-30 真空灭弧室极柱以及相关的电气设备

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EP4300526A1 true EP4300526A1 (en) 2024-01-03

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Application Number Title Priority Date Filing Date
EP23182729.6A Pending EP4300526A1 (en) 2022-06-30 2023-06-30 Vacuum interrupter pole and its associated electrical device

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EP (1) EP4300526A1 (zh)
CN (1) CN115172094A (zh)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980037833U (ko) * 1996-12-18 1998-09-15 이종수 진공차단기의 회로부 구조
DE102009020152B3 (de) * 2009-05-06 2010-12-23 Siemens Aktiengesellschaft Isolierstoffgehäuse zur Aufnahme einer Vakuumschaltröhre und feststoffisolierter Schalterpol
CN106816341A (zh) * 2017-03-16 2017-06-09 温州开元集团有限公司 一种绝缘座及真空负荷开关‑熔断器组合电器
CN106952774A (zh) * 2017-05-09 2017-07-14 亚洲电力设备(深圳)股份有限公司 一种环保开关设备专用真空断路器固封极柱
EP3410455A1 (en) * 2017-05-31 2018-12-05 ABB Schweiz AG Medium voltage pole assembly

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980037833U (ko) * 1996-12-18 1998-09-15 이종수 진공차단기의 회로부 구조
DE102009020152B3 (de) * 2009-05-06 2010-12-23 Siemens Aktiengesellschaft Isolierstoffgehäuse zur Aufnahme einer Vakuumschaltröhre und feststoffisolierter Schalterpol
CN106816341A (zh) * 2017-03-16 2017-06-09 温州开元集团有限公司 一种绝缘座及真空负荷开关‑熔断器组合电器
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