WO2016001328A1 - Circuit breaker - Google Patents

Circuit breaker Download PDF

Info

Publication number
WO2016001328A1
WO2016001328A1 PCT/EP2015/065033 EP2015065033W WO2016001328A1 WO 2016001328 A1 WO2016001328 A1 WO 2016001328A1 EP 2015065033 W EP2015065033 W EP 2015065033W WO 2016001328 A1 WO2016001328 A1 WO 2016001328A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact part
contact
electrode rod
circuit breaker
terminal
Prior art date
Application number
PCT/EP2015/065033
Other languages
French (fr)
Inventor
Paulus Geusendam
Gerhardus Leonardus Nitert
Marcel Van Dijk
Original Assignee
Eaton Industries (Netherlands) B.V.
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 Eaton Industries (Netherlands) B.V. filed Critical Eaton Industries (Netherlands) B.V.
Publication of WO2016001328A1 publication Critical patent/WO2016001328A1/en

Links

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
    • H01H33/6606—Terminal arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal

Definitions

  • the invention relates to a Circuit breaker comprising:
  • Circuit breaker is for example known from US 2009218319.
  • the movable electrode rod is electrically connected to the second terminal via a flexible electrical lead.
  • Other circuit breaker is known from US 2010000972.
  • the switching device In medium voltage applications the switching device needs to be moved at high speed to get a solid contact. In order to achieve this high speed movement, the movable electrode rod also needs to move at high speed. To ensure a good electrical connection between the movable electrode rod and a fixed terminal, a flexible lead is permanently fixed between this rod and the fixed terminal.
  • each contact means provides a number of components and provides a contact resistance in the circuit breaker. It is an object of the invention to provide a Circuit breaker according to the preamble, in which the disadvantages of the prior art are reduced.
  • the contact means comprise a first contact part arranged on the housing and in electrical connection with the second terminal, and a second contact part arranged on the movable electrode rod, wherein at least one of the first contact part and the second contact part is flexibly mounted in axial direction of the movable electrode rod.
  • the contact between the second terminal and the movable electrode rod will be established when the switching device is moved from the disconnected position to the open position.
  • the flexibly mounted second contact part ensures that the movable rod of the switching device can be moved further between the open position and closed position, while
  • the switching device having the two contacts movable relative to each other could for example be a vacuum interrupter, a vacuum circuit breaker or a vacuum load-break switch.
  • the first contact part and second contact part are concentrically arranged.
  • a concentric arrangement is of advantage with typical electrode rods, which typically have a circular cross section. The concentric arrangement of the contact parts will ensure that the electrode rod will be loaded evenly when the contact opens and closes.
  • the first contact part and second contact part are concentric rings and wherein the contact means further comprise a spring element arranged on the contact surface of the two concentric rings.
  • the spring element will provide some flexibility in the contact surface between the two concentric rings, such that a solid contact is achieved, while some play can be present between the rings.
  • the spring element is an annular coil spring.
  • the flexibly mounted contact part has radially extending curved flexible mounting elements.
  • These curved flexible mounting elements could for example be embodied as spring leaves, or as torsion springs or as a combination thereof. These curved flexible mounting elements provide sufficient flexibility for the contact part, such that the movements of the movable rod can easily be followed when the switching device moves between the closed position and open position. During these movements, the contact means will ensure the solid electrical contact between the movable rod and a fixed terminal.
  • the flexibly mounted contact part further has a mounting ring concentrically arranged to the contact part and to which the curved flexible mounting elements are attached.
  • the contact part can easily be mounted on either the electrode rod or on the inside of the housing.
  • the flexibly mounted contact part is composed out of a plurality of metal layers, which are welded together at the contact part and at the mounting ring, such that the metal layers can move relative to each other at the mounting elements.
  • the flexibly mounted contact part By composing the flexibly mounted contact part out of a plurality of metal layers, flexibility is easily obtained in the contact, while sufficient material is present to conduct the current through the contact. In case higher amounts of current need to be conducted through the switching device, two or more contact means can be stacked, such that a larger amount of current can be conducted via the contact parts.
  • Figure 1 shows a perspective cross-sectional view of an embodiment of a Circuit breaker according to the invention.
  • Figure 2 shows a perspective cross-sectional view of the contact means of figure 1.
  • Figure 3 shows a cross-sectional view of a flexible contact part of the contact means of figure 2.
  • Figures 4A - 4C show the Circuit breaker of figure 1 in three different positions.
  • FIG. 1 shows a perspective cross-sectional view of an embodiment of a Circuit breaker 1 according to the invention.
  • the Circuit breaker 1 has an insulation housing 2, 3, 4, 5.
  • a vacuum interrupter 6 is arranged within the insulation housing 2, 3, 4, 5.
  • the vacuum interrupter 6 has a fixed main contact 7 arranged to an electrode rod 8 and electrically connected to a first terminal 9 accessible from the outside of the housing 2, 3, 4, 5.
  • the vacuum interrupter 6 has further a second, movable, main contact 10, which is arranged on a movable electrode rod 11.
  • the movable rod 11 is operable by an insulated operation pin 12.
  • the movable electrode rod 11 is furthermore provided with a flexible contact part 13, which is in contact with another contact part 14 to establish an electrical connection between the main contact 10 and the second terminal 15 arranged on the outside of the housing 2, 3, 4, 5.
  • Figure 2 shows a perspective cross-sectional view of the contact means 13, 14 of figure 1.
  • the other contact part 14 is ring shaped and arranged on the inside of the housing 2, 3, 4, 5.
  • the flexible contact part 13 comprises a ring-shaped contact ring 16, radially extending curved flexible mounting elements 17, 18, 19 and a mounting ring 20 with which the flexible contact 13 is arranged to the movable electrode rod 11.
  • the circumferential outer surface of the contact ring 16 is provided with grooves 21 for housing two annular coil springs 22, which ensure a solid contact between the contact ring 16 and the ring-shaped contact part 14.
  • Figure 3 shows a cross-sectional view of the flexible contact part 13.
  • the flexible contact part 13 is build out of a plurality of stacked metal layers 23.
  • the stacked metal layers 23 are welded together, such that a solid contact ring 16 and a solid mounting ring 20 is created.
  • the flexible mounting elements 17, 18, 19 are composed out of loose bands of metal, as the metal layers are not welded together at this particular position.
  • Figure 4A shows the Circuit breaker 1 according to the invention in a closed position. In this position both contacts 7, 10 of the vacuum interrupter 6 are pressed against each other.
  • the electrode rod 8 is electrically connected to the first terminal 9, while the movable electrode rod 11 is connected to the second terminal 15 via the mounting ring 20, the flexible mounting elements 17, 18, 19, the contact ring 16 and the ring-shaped contact part 14.
  • Figure 4B shows the Circuit breaker 1 in an open position in which the operation pin 12 is pulled downward, such that the movable electrode rod 11 is moved down causing the two contacts 7, 10 of the vacuum interrupter to disconnect. Due to the flexibility of the mounting element 17, 18, 19, the movable electrode rod 11 stays in contact with the second terminal 15.
  • Figure 4C shows the Circuit breaker 1 in disconnected position.
  • the operation pin 12 is moved further, such that the electrode rod 8 disconnects from the first terminal 9 and the complete vacuum interrupter 6 is moved downward.
  • the contact ring 16 will disconnect from the ring-shaped contact part 14, such that the vacuum interrupter 6 is fully disconnected from both the first terminal 9 and the second terminal 15.

Abstract

The invention relates to a Circuit breaker comprising: - a switching device arranged within an insulation housing; - a fixed electrode rod mounted on one side of the switching device; - a movable electrode rod mounted on the other side of the switching device; - a first terminal arranged on the housing and electrically connected to the fixed electrode rod; - a second terminal for electrical connection with the movable electrode rod; and - contact means for establishing an electrical contact between the second terminal and the movable electrode rod in both the open position and the closed position of the switching device wherein the contact means comprise a first contact part arranged on the housing and in electrical connection with the second terminal, and a second contact part arranged on the movable electrode rod, wherein at least one of the first contact part and the second contact part is flexibly mounted in axial direction of the movable electrode rod.

Description

Circuit breaker
The invention relates to a Circuit breaker comprising:
- an switching device having two contacts movable relative to each other and arranged within an insulation housing;
- a fixed electrode rod mounted on one side of the switching device;
- a movable electrode rod mounted on the other side of the switching device;
- a first terminal arranged on the housing and electrically connected to the fixed electrode rod;
- a second terminal for electrical connection with the movable electrode rod; and
- contact means for establishing an electrical contact between the second terminal and the movable electrode rod in both the open position and the closed position of the switching device
Such a Circuit breaker is for example known from US 2009218319. In this prior art circuit breaker the movable electrode rod is electrically connected to the second terminal via a flexible electrical lead. Other circuit breaker is known from US 2010000972.
In medium voltage applications the switching device needs to be moved at high speed to get a solid contact. In order to achieve this high speed movement, the movable electrode rod also needs to move at high speed. To ensure a good electrical connection between the movable electrode rod and a fixed terminal, a flexible lead is permanently fixed between this rod and the fixed terminal.
When the switching device is in the open position, it is required, that the switching device can be moved further, such that the switching device can be disconnected. It is known in the prior art to provide second contact means comprising two parts, one of which is arranged to the fixed terminal, while the other part of the second contact means moves along with the switching device towards the disconnected position. The disadvantage of having two separate contact means is that each contact means provides a number of components and provides a contact resistance in the circuit breaker. It is an object of the invention to provide a Circuit breaker according to the preamble, in which the disadvantages of the prior art are reduced.
This object is achieved with a Circuit breaker according to the preamble, which is
characterized in that the contact means comprise a first contact part arranged on the housing and in electrical connection with the second terminal, and a second contact part arranged on the movable electrode rod, wherein at least one of the first contact part and the second contact part is flexibly mounted in axial direction of the movable electrode rod.
By having a first contact part arranged on the housing and a second contact part arranged on the movable electrode rod, the contact between the second terminal and the movable electrode rod will be established when the switching device is moved from the disconnected position to the open position.
The flexibly mounted second contact part ensures that the movable rod of the switching device can be moved further between the open position and closed position, while
maintaining a solid electrical connection between the movable rod and a fixed terminal.
So, with the invention only single contact means are provided which enable movement from the closed position, via the open position to the disconnected position. Due to the single contact means, the contact resistance is reduced and fewer components are needed to provide the same functionality within the Circuit breaker.
The switching device having the two contacts movable relative to each other could for example be a vacuum interrupter, a vacuum circuit breaker or a vacuum load-break switch.
In an embodiment of the Circuit breaker according to the invention the first contact part and second contact part are concentrically arranged. A concentric arrangement is of advantage with typical electrode rods, which typically have a circular cross section. The concentric arrangement of the contact parts will ensure that the electrode rod will be loaded evenly when the contact opens and closes.
In a preferred embodiment of the Circuit breaker according to the invention the first contact part and second contact part are concentric rings and wherein the contact means further comprise a spring element arranged on the contact surface of the two concentric rings. The spring element will provide some flexibility in the contact surface between the two concentric rings, such that a solid contact is achieved, while some play can be present between the rings.
In a further embodiment of the Circuit breaker according to the invention the spring element is an annular coil spring.
In a further preferred embodiment of the Circuit breaker according to the invention the flexibly mounted contact part has radially extending curved flexible mounting elements. These curved flexible mounting elements could for example be embodied as spring leaves, or as torsion springs or as a combination thereof. These curved flexible mounting elements provide sufficient flexibility for the contact part, such that the movements of the movable rod can easily be followed when the switching device moves between the closed position and open position. During these movements, the contact means will ensure the solid electrical contact between the movable rod and a fixed terminal.
Preferably, the flexibly mounted contact part further has a mounting ring concentrically arranged to the contact part and to which the curved flexible mounting elements are attached.
With the mounting ring, the contact part can easily be mounted on either the electrode rod or on the inside of the housing. In a further preferred embodiment of the Circuit breaker according to the invention the flexibly mounted contact part is composed out of a plurality of metal layers, which are welded together at the contact part and at the mounting ring, such that the metal layers can move relative to each other at the mounting elements.
By composing the flexibly mounted contact part out of a plurality of metal layers, flexibility is easily obtained in the contact, while sufficient material is present to conduct the current through the contact. In case higher amounts of current need to be conducted through the switching device, two or more contact means can be stacked, such that a larger amount of current can be conducted via the contact parts.
These and other features of the invention will be elucidated in conjunction with the accompanying drawings.
Figure 1 shows a perspective cross-sectional view of an embodiment of a Circuit breaker according to the invention. Figure 2 shows a perspective cross-sectional view of the contact means of figure 1.
Figure 3 shows a cross-sectional view of a flexible contact part of the contact means of figure 2. Figures 4A - 4C show the Circuit breaker of figure 1 in three different positions.
Figure 1 shows a perspective cross-sectional view of an embodiment of a Circuit breaker 1 according to the invention. The Circuit breaker 1 has an insulation housing 2, 3, 4, 5. A vacuum interrupter 6 is arranged within the insulation housing 2, 3, 4, 5. The vacuum interrupter 6 has a fixed main contact 7 arranged to an electrode rod 8 and electrically connected to a first terminal 9 accessible from the outside of the housing 2, 3, 4, 5.
The vacuum interrupter 6 has further a second, movable, main contact 10, which is arranged on a movable electrode rod 11. The movable rod 11 is operable by an insulated operation pin 12.
The movable electrode rod 11 is furthermore provided with a flexible contact part 13, which is in contact with another contact part 14 to establish an electrical connection between the main contact 10 and the second terminal 15 arranged on the outside of the housing 2, 3, 4, 5.
Figure 2 shows a perspective cross-sectional view of the contact means 13, 14 of figure 1. The other contact part 14 is ring shaped and arranged on the inside of the housing 2, 3, 4, 5. The flexible contact part 13 comprises a ring-shaped contact ring 16, radially extending curved flexible mounting elements 17, 18, 19 and a mounting ring 20 with which the flexible contact 13 is arranged to the movable electrode rod 11.
The circumferential outer surface of the contact ring 16 is provided with grooves 21 for housing two annular coil springs 22, which ensure a solid contact between the contact ring 16 and the ring-shaped contact part 14.
Figure 3 shows a cross-sectional view of the flexible contact part 13. The flexible contact part 13 is build out of a plurality of stacked metal layers 23. At the position of the contact ring 16 and the mounting ring 20, the stacked metal layers 23 are welded together, such that a solid contact ring 16 and a solid mounting ring 20 is created. Accordingly, the flexible mounting elements 17, 18, 19 are composed out of loose bands of metal, as the metal layers are not welded together at this particular position.
Figure 4A shows the Circuit breaker 1 according to the invention in a closed position. In this position both contacts 7, 10 of the vacuum interrupter 6 are pressed against each other.
The electrode rod 8 is electrically connected to the first terminal 9, while the movable electrode rod 11 is connected to the second terminal 15 via the mounting ring 20, the flexible mounting elements 17, 18, 19, the contact ring 16 and the ring-shaped contact part 14.
Figure 4B shows the Circuit breaker 1 in an open position in which the operation pin 12 is pulled downward, such that the movable electrode rod 11 is moved down causing the two contacts 7, 10 of the vacuum interrupter to disconnect. Due to the flexibility of the mounting element 17, 18, 19, the movable electrode rod 11 stays in contact with the second terminal 15.
Figure 4C shows the Circuit breaker 1 in disconnected position. In this position, the operation pin 12 is moved further, such that the electrode rod 8 disconnects from the first terminal 9 and the complete vacuum interrupter 6 is moved downward. As a result, the contact ring 16 will disconnect from the ring-shaped contact part 14, such that the vacuum interrupter 6 is fully disconnected from both the first terminal 9 and the second terminal 15.

Claims

Claims
1. Circuit breaker (1) comprising:
- a switching device having two contacts (7, 10) movable relative to each other and arranged within an insulation housing (2, 3, 4, 5);
- a fixed electrode rod (8) mounted on one side of the switching device;
- a movable electrode rod (11) mounted on the other side of the switching device;
- a first terminal (9) arranged on the housing (2, 3, 4, 5) and electrically connected to the fixed electrode rod (8);
- a second terminal (15) for electrical connection with the movable electrode rod (11); and
- contact means (13, 14) for establishing an electrical contact between the second terminal (15) and the movable electrode rod (11) in both the open position and the closed position of the switching device, the contact means (13, 14) comprise a first contact part (14) arranged on the housing (2, 3, 4, 5) and in electrical connection with the second terminal (15), a second contact part (13) arranged on the movable electrode rod (11), the first contact part (14) and second contact part (13) are arranged concentrically wherein at least one of the first contact part (14) and the second contact part (13) is flexibly mounted in axial direction of the movable electrode rod (11) characterized in that the first contact part (14) and second contact part (13) are concentric rings and wherein the contact means (13, 14) further comprise a spring element (22) arranged on the contact surface of the two concentric rings.
2. Circuit breaker (1) according to claim 1, wherein the spring element (22) is an annular coil spring.
3. Circuit breaker (1) according to claim 1, wherein the flexibly mounted contact part (13) has radially extending curved flexible mounting elements (17, 18, 19).
4. Circuit breaker (1) according to claim 3, wherein the flexibly mounted contact part (13) further has a mounting ring (20) concentrically arranged to the contact part (14) and to which the curved flexible mounting elements (17, 18, 19) are attached.
5. Circuit breaker (1) according to claim 4, wherein the flexibly mounted contact part (13) is composed out of a plurality of metal layers (23), which are welded together at the contact part (14) and at the mounting ring (20), such that the metal layers (23) can move relative to each other at the mounting elements (17, 18, 19).
PCT/EP2015/065033 2014-07-02 2015-07-01 Circuit breaker WO2016001328A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1411830.1A GB2527800A (en) 2014-07-02 2014-07-02 Circuit breaker
GB1411830.1 2014-07-02

Publications (1)

Publication Number Publication Date
WO2016001328A1 true WO2016001328A1 (en) 2016-01-07

Family

ID=51410546

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/065033 WO2016001328A1 (en) 2014-07-02 2015-07-01 Circuit breaker

Country Status (2)

Country Link
GB (1) GB2527800A (en)
WO (1) WO2016001328A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020173894A1 (en) * 2019-02-28 2020-09-03 Siemens Aktiengesellschaft Vacuum switching device for medium- and high-voltage applications
US11387633B2 (en) 2019-02-13 2022-07-12 Abb Schweiz Ag Closing switch and switchgear

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3567892A (en) * 1969-04-15 1971-03-02 Coq Nv Electric switches of large power comprising axially movable switching rods and resilient annular fixed contacts which are in permanent contact with said switching rods and contact strips for such fixed contacts
US3997747A (en) * 1972-11-20 1976-12-14 Westinghouse Electric Corporation Circuit interrupter
US4168414A (en) * 1975-03-06 1979-09-18 Mcgraw-Edison Company Protective switch device and operating mechanism therefor
WO2003071567A1 (en) * 2002-02-20 2003-08-28 Siemens Aktiengesellschaft Vacuum interrupter with a switch contact piece
WO2004049366A1 (en) * 2002-11-28 2004-06-10 Mitsubishi Denki Kabushiki Kaisha Vacuum valve unit
US20100000972A1 (en) * 2006-09-07 2010-01-07 Switchcraft Europe Gmbh Vacuum Circuit Breaker

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US4153827A (en) * 1976-01-26 1979-05-08 Merlin Gerin Magnetic blow-out arc extinguishing device
US5436414A (en) * 1993-07-16 1995-07-25 Eaton Corporation Drive mechanism for circuit interrupters
JPH09298023A (en) * 1996-05-01 1997-11-18 Mitsubishi Electric Corp Vacuum switch
US6172317B1 (en) * 1999-11-03 2001-01-09 Vacuum Electric Switch Co. Foam encapsulated vacuum interrupter module removably mounted in a housing
FR2808117B1 (en) * 2000-03-31 2003-01-24 Schneider Electric Ind Sa ELECTRICAL SWITCHING APPARATUS COMPRISING A VACUUM BULB AND A FLEXIBLE ELECTRICAL CONNECTION
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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567892A (en) * 1969-04-15 1971-03-02 Coq Nv Electric switches of large power comprising axially movable switching rods and resilient annular fixed contacts which are in permanent contact with said switching rods and contact strips for such fixed contacts
US3997747A (en) * 1972-11-20 1976-12-14 Westinghouse Electric Corporation Circuit interrupter
US4168414A (en) * 1975-03-06 1979-09-18 Mcgraw-Edison Company Protective switch device and operating mechanism therefor
WO2003071567A1 (en) * 2002-02-20 2003-08-28 Siemens Aktiengesellschaft Vacuum interrupter with a switch contact piece
WO2004049366A1 (en) * 2002-11-28 2004-06-10 Mitsubishi Denki Kabushiki Kaisha Vacuum valve unit
US20100000972A1 (en) * 2006-09-07 2010-01-07 Switchcraft Europe Gmbh Vacuum Circuit Breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11387633B2 (en) 2019-02-13 2022-07-12 Abb Schweiz Ag Closing switch and switchgear
WO2020173894A1 (en) * 2019-02-28 2020-09-03 Siemens Aktiengesellschaft Vacuum switching device for medium- and high-voltage applications
CN113711325A (en) * 2019-02-28 2021-11-26 西门子能源全球有限公司 Vacuum switchgear for medium and high voltage applications
CN113711325B (en) * 2019-02-28 2024-03-08 西门子能源全球有限公司 Vacuum switching device for medium and high voltage applications

Also Published As

Publication number Publication date
GB2527800A (en) 2016-01-06
GB201411830D0 (en) 2014-08-13

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