EP4235721B1 - Dispositif de commutation, ensemble interrupteur à vide et procédé de fonctionnement d'un dispositif de commutation pour la distribution d'électricité - Google Patents

Dispositif de commutation, ensemble interrupteur à vide et procédé de fonctionnement d'un dispositif de commutation pour la distribution d'électricité

Info

Publication number
EP4235721B1
EP4235721B1 EP22159258.7A EP22159258A EP4235721B1 EP 4235721 B1 EP4235721 B1 EP 4235721B1 EP 22159258 A EP22159258 A EP 22159258A EP 4235721 B1 EP4235721 B1 EP 4235721B1
Authority
EP
European Patent Office
Prior art keywords
contact member
stem
vacuum interrupter
slot
switching device
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.)
Active
Application number
EP22159258.7A
Other languages
German (de)
English (en)
Other versions
EP4235721A1 (fr
Inventor
Ravindra Chikhale
Mahesh Sonawane
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP22159258.7A priority Critical patent/EP4235721B1/fr
Publication of EP4235721A1 publication Critical patent/EP4235721A1/fr
Application granted granted Critical
Publication of EP4235721B1 publication Critical patent/EP4235721B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H01H33/666—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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/62—Heating or cooling of contacts

Definitions

  • the present disclosure generally relates to electric power distribution, and more particularly to a switching device for opening and closing a circuit between a first connection arm and a second connection arm in electric power distribution.
  • a switching device (also commonly known as switchgear) is an apparatus used for controlling, regulating, and switching on and off the electrical circuit in electrical power distribution.
  • the switching device is typically placed in both high and low voltage side of a power transformer, and is used for de-energizing the equipment for testing and maintenance and for clearing the fault. For instance, when the fault occurs in the electrical power distribution, heavy current flows through equipment due to which there is a risk that the equipment may get damaged, and the service also may get interrupted. Therefore, in order to protect the lines, generators, transformers and other electrical equipment from damage, automatic protective devices, such as the switchgear devices, are utilized.
  • a particular type of switching device is a vacuum circuit interrupter apparatus which includes separable main contacts disposed in an insulated housing.
  • the switchgear typically, includes a bus-bar compartment, a circuit-breaker compartment, a transformer compartment and a cable bushing compartment which together forms a single-phase pole assembly.
  • Such similar pole assemblies mounted together in adjacent layer will form the entire switchgear.
  • the circuit-breaker compartment consists of a vacuum interrupter which is used to connect and disconnect the circuit which is operated by means of spring-operated drive.
  • one of the contacts is fixed relative to both the housing and to an external electrical conductor which is interconnected with the circuit to be controlled by the vacuum interrupter.
  • the other main contact is movable and usually comprises a cylindrical stem having the contact at one end thereof enclosed in a vacuum chamber and a driving mechanism at the other end thereof external to the vacuum chamber. Often the electrical interconnection between the circuit to be protected by the circuit interrupter and the movable contact is made on the cylindrical stem.
  • a flexible connector is used for connecting the movable contact to the fixed contact.
  • the flexible connector is made of a stack of flexible sheets of a conducting material and is constructed such that it can accommodate the movement of the movable contact.
  • the flexible connector is made from multiple copper foils of 0.1 millimeters thickness, which are brazed together to achieve the desired shape and thickness.
  • the flexibility of the flexible connector ensures that there is always a contact between the movable contact and the stationary contact.
  • the flexible connector connects electrical current carrying connection between the circuit-breaker compartment and the bus-bar compartment.
  • the flexible connector is mechanically bolted at both ends by nut and bolts which forms rigid connection to bushing between the circuit-breaker compartment and the bus-bar compartment.
  • FIG 1A illustrates a partial diagrammatic cross-section representation of a switchgear device 10 implementing a vacuum interrupter based circuit breaker 20, in accordance with prior-art.
  • the switchgear device 10 has a top contact arm 14 and a bottom contact arm 16 embedded in a housing 12.
  • the circuit breaker 20 has a vacuum interrupter (VI) fixed stem 22 rigidly fixed with the top contact arm 14.
  • a flexible connection 26 is used to join a vacuum interrupter (VI) moving stem 24 to the bottom contact arm 16 of switchgear device 10.
  • the VI moving stem 24 has linear movement for switching the circuit breaker 20 in ON and OFF configurations using the circuit breaker kinematics (not shown).
  • FIG 1B illustrates a diagrammatic representation of the flexible connection 26, in accordance with prior-art.
  • the flexible connection 26, as known in the prior-art, is made from multiple copper foils typically of 0.1 mm thickness which are brazed together to achieve the desired shape and thickness as per cross section required for carry rated current.
  • Such flexible connection 26 need to move along with the VI moving stem 26 during ON and OFF operation. Since the flexible connection 26 is part of the main current path, it is critical for temperature rise when continuous current rated current flows through the switchgear device 10.
  • the flexible connection 26 Because of the flexible connection 26, assembly of components becomes bigger and critical for dielectric requirements for the switchgear device 10. Further, the flexible connection 26 typically has sharp edges, thus there is a possibility of dielectric flashovers. Furthermore, the need to bolt the flexible connection 26, especially at the top end requires access space which needs to be incorporated into the design of the switchgear device 10.
  • the document DE 10 2007 038898 B3 discloses a switching device for opening and closing a circuit between a first connection arm and a second connection arm, according to the preamble of claim 1.
  • One object of the present disclosure is to provide a switching device for electric power distribution which replaces the flexible connection with a novel contact arrangement which solves critical issues like temperature rise, dielectric requirements, and bigger assembly by carrying out the excess heat and making it dielectrically more stable at the moving stem of the vacuum interrupter with compact and simplified assembly.
  • the object of the present disclosure is achieved by a switching device for opening and closing a circuit between a first connection arm and a second connection arm.
  • the switching device comprises an insulated chamber.
  • the switching device further comprises a vacuum interrupter unit arranged inside the insulated chamber and having a first end and a second end.
  • the vacuum interrupter unit provides a first stem located at the first end thereof and a second stem located at the second end thereof.
  • the first stem is disposed in fixed electrical contact with the first connection arm.
  • the switching device further comprises a rigid contact member having a first end and a second end.
  • the rigid contact member has a slot defined at the first end thereof and a contact arm defined at the second end thereof.
  • the contact arm is disposed in fixed electrical contact with the second connection arm.
  • the switching device further comprises a compressible contact member having a hollow profile adapting to an internal profile of the slot of the rigid contact member.
  • the compressible contact member is positioned inside the slot of the rigid contact member.
  • the second stem of the vacuum interrupter unit is configured to move linearly in the insulated chamber between a first position and a second position. In the first position, the second stem is in electrical engagement with the compressible contact member thereby closing the circuit between the first connection arm and the second connection arm. In the second position, the second stem is out of electrical engagement with the compressible contact member thereby opening the circuit between the first connection arm and the second connection arm.
  • the switching device further comprises a movable contact member fixed to the second stem at the second end of the vacuum interrupter unit.
  • the movable contact member has a profile adapted to be received inside the hollow profile of the compressible contact member when the second stem is disposed in the first position thereof.
  • the compressible contact member is formed of multiple strips of a conducting material joined together to impart radial flexibility thereto, and ensuring physical connection with the movable contact member when received inside the hollow profile thereof.
  • the switching device further comprises a heat sink having a body with a complementary slot to the slot of the rigid contact member.
  • the heat sink is associated with the rigid contact member such that the complementary slot thereof is aligned with the slot of the rigid contact member, and thereby guide the movable contact member to be received inside the hollow profile of the compressible contact member when the second stem is disposed in the first position thereof.
  • the heat sink comprises a plurality of fins extending radially outwardly from the body thereof.
  • the insulated chamber is made of epoxy resin material.
  • a vacuum interrupter assembly for a switching device.
  • the vacuum interrupter assembly comprises a vacuum interrupter unit having a first end and a second end.
  • the vacuum interrupter unit provides a first stem located at the first end thereof and a second stem located at the second end thereof.
  • the vacuum interrupter assembly further comprises a rigid contact member having a first end and a second end.
  • the rigid contact member has a slot defined at the first end thereof and a contact arm defined at the second end thereof.
  • the vacuum interrupter assembly further comprises a compressible contact member having a hollow profile adapting to an internal profile of the slot of the rigid contact member.
  • the compressible contact member is positioned inside the slot of the rigid contact member.
  • the second stem of the vacuum interrupter unit is configured to move linearly between a first position and a second position, wherein in the first position, the second stem is in electrical engagement with the compressible contact member, and wherein in the second position, the second stem is out of electrical engagement with the compressible contact member.
  • the compressible contact member is formed of multiple strips of a conducting material joined together to impart radial flexibility thereto, and ensuring physical connection with the movable contact member when received inside the hollow profile thereof
  • the vacuum interrupter assembly further comprises a heat sink having a body with a complementary slot to the slot of the rigid contact member.
  • the heat sink is associated with the rigid contact member such that the complementary slot thereof is aligned with the slot of the rigid contact member, and thereby guide the movable contact member to be received inside the hollow profile of the compressible contact member when the second stem is disposed in the first position thereof.
  • the heat sink comprises a plurality of fins extending radially outwardly from the body thereof.
  • the movable contact member has a hollow cylindrical profile adapted to be received inside a hollow profile of the compressible contact member when the second stem is disposed in the first position thereof.
  • a method of operating a switching device for opening and closing a circuit between a first connection arm and a second connection arm comprises providing an insulated chamber.
  • the method further comprises arranging a vacuum interrupter unit inside the insulated chamber, with the vacuum interrupter unit having a first end and a second end, and the vacuum interrupter unit providing a first stem located at the first end thereof and a second stem located at the second end thereof.
  • the method further comprises disposing the first stem in fixed electrical contact with the first connection arm.
  • the method further comprises providing a rigid contact member, with the rigid contact member having a first end and a second end, and a slot defined at the first end thereof and a contact arm defined at the second end thereof.
  • the method further comprises disposing the contact arm in fixed electrical contact with the second connection arm.
  • the method further comprises positioning a compressible contact member, having a hollow profile, adapting to an internal profile of the slot of the rigid contact member, inside the slot of the rigid contact member.
  • the method further comprises reciprocating the second stem of the vacuum interrupter unit to move linearly in the insulated chamber between a first position and a second position. In the first position, the second stem is in electrical engagement with the compressible contact member thereby closing the circuit between the first connection arm and the second connection arm. In the second position, the second stem is out of electrical engagement with the compressible contact member thereby opening the circuit between the first connection arm and the second connection arm.
  • the method also comprises providing a movable contact member fixed to the second stem at the second end of the vacuum interrupter unit, with the movable contact member having a profile adapted to be received inside the hollow profile of the compressible contact member when the second stem is disposed in the first position thereof.
  • the method also comprises providing a heat sink having a body with a complementary slot to the slot of the rigid contact member.
  • the method further comprises associating the heat sink with the rigid contact member such that the complementary slot thereof is aligned with the slot of the rigid contact member, and thereby guide the movable contact member to be received inside the hollow profile of the compressible contact member when the second stem is disposed in the first position thereof.
  • Example embodiments of a switching device described herein is a vacuum interrupter based switchgear which may be included in a medium voltage switchgear unit. Such switching device may be used in several different applications, for instance, for capacitor switching or for sectionalizing a line or system of switches.
  • the switching device may also be molded into a "load break" elbow connector to interrupt currents of medium voltage distribution systems.
  • the switching device may be connected to a generator or to a consumer line, in which the generator or the consumer line is dis-connectable from or connectable to the energy line by means of the switching device, as per the embodiments of the present disclosure.
  • the switching device may be implemented as a gas-insulated switchgear, a vacuum interrupter or an air-break disconnector.
  • FIG 2 is a diagrammatic perspective view of an exemplary switching device 100, in accordance with certain embodiments.
  • the switching device 100 is depicted as a three-phase medium voltage switchgear, that is to say the switching device 100 has a plurality of phase conductor sections, which are used to transmit electrical power by means of a polyphase electrical power system.
  • the switching device 100 and further modules of the switching device 100, and therefore the entire polyphase switching device 100 are designed for three phases; however, it may be contemplated that for the purposes of the present disclosure, the switching device 100 may be a single phase or any other type of switchgear as known in the art without any limitations.
  • the switching device 100 includes a housing 102. Also, as shown, the housing 102 supports three pole assemblies 104 therein. Herein, each pole assembly 104 (sometimes, simply referred to as a pole 104) is responsible for a single phase in the three-phase switching device 100 of the present examples.
  • the switching device 100 may further include a control panel (generally represented by the numeral 106) which acts on a switching shaft (not shown) common to all the poles 104 of the switching device 100.
  • FIG 3 is a diagrammatic perspective view representation of the pole assembly 104 of the switching device 100, in accordance with certain embodiments.
  • the pole assembly 104 includes an enclosure 108.
  • the enclosure 108 is generally hollow and may have any suitable shape based on the design and configuration of the switching device 100.
  • the enclosure 108 is typically grounded during operation, i.e., electrically connected to earth.
  • the enclosure 108 is made of a suitable electrically conductive material, e.g., aluminum (such as, cast aluminum), mild steel, etc. Casting, or molding, an aluminum enclosure is a non-expensive procedure.
  • the enclosure 108 can also be made of copper, zinc or any other suitable electrically conductive material.
  • the enclosure 108 is filled with an insulating gas.
  • the switching device 100 is an air-insulated switching device, i.e., the enclosure 108 is filled with air.
  • the insulating gas is sulfur hexafluoride (SF6) free gas. It may be understood that in order to accommodate the insulating gas, the enclosure 108 is sealed and in turn may preferably be made of a material which is gas-impermeable, such as glass, polymers or resins.
  • a filler material may be provided in the housing 102 (as shown in FIG 2 ), surrounding the enclosure 108 filled with the insulating gas (such as, air), with the filler material having preferably a higher specific permittivity as compared to the enclosure 108 filled with the gaseous insulating medium.
  • the filler material may be a liquid dielectric, a solid dielectric, but also supercritical fluids, suspensions, in particular colloids or other mixed-phase substances.
  • a liquid fluid may in particular be an oil based on fluorinated hydrocarbons or a silicone oil.
  • a solid fluid may be a polymer or a resin.
  • the filler material may also be a gas which has a higher dielectric strength than the gaseous insulating medium in the hollow enclosure 108. In this case, it is not necessary that the filler material has a higher dielectric permittivity than the hollow spheres with the gaseous insulating medium.
  • an outer shape, or an outer geometry, of the enclosure 108 is smooth to distribute the electric field generated by the voltage through the switching device 100.
  • the outer surface of the enclosure 108 is designed to be smooth to distribute the electric field generated by the current through the switching device 100.
  • the outer surface of the enclosure 108 is smooth in that the enclosure 108 does not have an angular outer shape and is without roughness. That is, the outer surface of the enclosure 108 is smooth in that the outer surface has no roughness, sharp projections or sharp indentations.
  • each pole 104 of the switching device 100 includes a bus-bar enclosure 110, a circuit-breaker enclosure 112, a transformer enclosure 114 (also known as current transformer) and a cable bushing enclosure 116.
  • each of the bus-bar enclosure 110, the circuit-breaker enclosure 112, the transformer enclosure 114 and the cable bushing enclosure 116 forms a part or a section of the enclosure 108.
  • the various components and assemblies of the bus-bar enclosure 110, the circuit-breaker enclosure 112, the transformer enclosure 114 and the cable bushing enclosure 116 have been described generally being part of the pole assembly 104 and/or the switching device 100 without any limitations.
  • the enclosure 108 is filled with the insulating gas. That is, each of the bus-bar enclosure 110, the circuit-breaker enclosure 112, the transformer enclosure 114 and the cable bushing enclosure 116 therein, is filled with the insulating gas as described above.
  • FIG 4 is a diagrammatic partial cross-sectional view representation of the pole assembly 104 of the switching device 100, in accordance with an embodiment of the present disclosure.
  • FIG 4 shows details of inside of the circuit-breaker enclosure 112 in the pole assembly 104.
  • the pole assembly 104 includes a first connection arm 118a and a second connection arm 118b of the switching device 100.
  • the first connection arm 118a is received generally in the bus-bar enclosure 110; and the second connection arm 118b is received generally in the cable bushing enclosure 116, extending into the circuit-breaker enclosure 112.
  • the first connection arm 118a and the second connection arm 118b may each include multiple electrical lines based on the design and configuration (e.g., multi-phase configuration) of the switching device 100.
  • the first connection arm 118a and the second connection arm 118b may be busbars, but may also be in the form of any other electrical conductor without any limitations.
  • the first connection arm 118a and the second connection arm 118b may include a number of electrical bushings (not shown) penetrating into the respective bus-bar enclosure 110 and the cable bushing enclosure 116, one for each phase of a plural phase system. The bushings may be brazed in end covers.
  • the first connection arm 118a and the second connection arm 118b are connected to cables (not shown) which either connect the switching device 100 to a load or to a medium or high voltage power distribution line.
  • the first connection arm 118a and the second connection arm 118b may each engage a fitting (not shown) to join the power cables of the power distribution line.
  • the switching device 100 includes an insulated chamber 120.
  • the insulated chamber 120 may generally be part of the enclosure 108 (as described above).
  • the insulated chamber 120 is made of epoxy resin material. Such materials provide good dielectric resistance and thus are suited to be used for manufacturing of the insulated chamber 120, as needed for the purposes of the present disclosure. It may be appreciated that, in other examples, the insulated chamber 120 may be made of other suitable material with high dielectric resistance without any limitations.
  • the switching device 100 includes a vacuum interrupter assembly 122.
  • the vacuum interrupter assembly 122 acts as the circuit-breaker for opening and closing a circuit between the first connection arm 118a and the second connection arm 118b.
  • the vacuum interrupter assembly 122 includes a vacuum interrupter unit 124.
  • the vacuum interrupter unit 124 is arranged inside the insulated chamber 120.
  • the vacuum interrupter unit 124 has a generally cylindrical shape.
  • the term "generally cylindrical" is used to mean that a housing of the vacuum interrupter unit 124 is substantially cylindrical but not necessarily of circular cross-section. Other less preferred cross-sections may be employed, if desired.
  • the vacuum interrupter unit 124 may have ribbed sections on its outer surface.
  • the vacuum interrupter unit 124 is aligned substantially coaxially to a central axis of the insulated chamber 122.
  • the vacuum interrupter unit 124 has a first end 124a and a second end 124b.
  • the vacuum interrupter unit 124 provides a first stem 126 located at the first end 124a thereof.
  • the first stem 126 is disposed in fixed electrical contact with the first connection arm 118a.
  • the first stem 126 may have contact points formed from copper-impregnated tungsten to be disposed in fixed electrical contact with the first connection arm 118a, of the switching device 100.
  • the vacuum interrupter unit 124 further provides a second stem 128 located at the second end 124b thereof.
  • the second stem 128 may be in the form of a cylindrical extension from the second end 124b of the vacuum interrupter unit 124.
  • the vacuum interrupter unit 124 is adapted to move linearly inside the insulated chamber 122.
  • the switching device 100 includes an actuating arrangement (not shown) configured to reciprocate the vacuum interrupter unit 124 to move linearly inside the insulated chamber 122 to be disposed between a first position and a second position.
  • the actuating arrangement is configured to reciprocate the second stem 128 of the vacuum interrupter unit 124 to move linearly in the insulated chamber 122 between the first position and the second position.
  • the actuating arrangement may include a rotary to linear conversion mechanism.
  • the actuating arrangement may include a slidercrank mechanism.
  • the actuating arrangement is connected to a rotating shaft (not shown) extending from outside into the insulated chamber 122 to provide input rotations, to be converted into reciprocating linear movement of the vacuum interrupter unit 124 inside the insulated chamber 122.
  • a rotating shaft not shown
  • Such actuating arrangement may be contemplated by a person skilled in the art and thus has not been described in detail herein for the brevity of the present disclosure.
  • the switching device 100 includes a movable contact member 130.
  • FIG 5 illustrates a detailed view of the movable contact member 130, in accordance with an embodiment of the present disclosure.
  • the movable contact member 130 has a generally hollow cylindrical profile.
  • the movable contact member 130 has a body 132 which is made of conductive material, such as, but not limited to, copper.
  • the movable contact member 130 defines a through-hole 134 in the body 132 thereof.
  • the through-hole 134, in the body 132 of the movable contact member 130 is sized and shaped to receive and engage with the second stem 128 of the vacuum interrupter unit 124 therein.
  • the movable contact member 130 is fixed to the second stem 128 at the second end 124b of the vacuum interrupter unit 124.
  • the vacuum interrupter unit 124 has a linear movement inside the insulated chamber 122, thus the movable contact member 130, which is fixed to the second stem 128 at the second end 124b of the vacuum interrupter unit 124, may move along with the vacuum interrupter unit 124 in the insulated chamber 122.
  • the switching device 100 includes a rigid contact member 140.
  • FIGS 6A-6B illustrate detailed views of the rigid contact member 140, in accordance with an embodiment of the present disclosure.
  • the rigid contact member 140 has a hollow cylindrical shape.
  • the rigid contact member 140 has a first end 140a and a second end 140b.
  • the rigid contact member 140 has a slot 142 defined at the first end 140a thereof.
  • the slot 142 may be in the form of a through-hole in the rigid contact member 140, imparting the hollow cylindrical shape thereto (as discussed).
  • the rigid contact member 140 further has a contact arm 144 defined at the second end 140b thereof.
  • the contact arm 144 may be extending from the second end 140b of the rigid contact member 140 in a direction opposite to the first end 140a thereof.
  • the contact arm 144 is disposed in fixed electrical contact with the second connection arm 118b.
  • the contact arm 144 has apertures 146 defined therein.
  • the contact arm 144 may be coupled to the second connection arm 118b using fastening members 147, such as bolts, passing through the apertures 146 in the contact arm 144 and corresponding apertures (not shown) in the second connection arm 118b, to dispose the contact arm 144 in fixed electrical contact with the second connection arm 118b, in the switching device 100.
  • fastening members 147 such as bolts
  • the rigid contact member 140 further has apertures 148a proximal to the first end 140a thereof and apertures 148b proximal to the second end 140b thereof.
  • the rigid contact member 140 may be supported directly or indirectly with the insulated chamber 122 by using fastening members 147, such as bolts, passing through the apertures 148a in the rigid contact member 140 and corresponding apertures (not shown) in the insulated chamber 122, to mount the rigid contact member 140 in the switching device 100.
  • the apertures 148b in the rigid contact member 140 may be implemented to support other components in the switching device 100 for its operation, as discussed in the proceeding paragraphs.
  • the switching device 100 includes a compressible contact member 150.
  • FIG 7 illustrates a detailed view of the compressible contact member 150, in accordance with an embodiment of the present disclosure.
  • the compressible contact member 150 is formed of multiple strips 152 of a conducting material. Such multiple strips 152 are joined together such that, as shown, the compressible contact member 150 has a hollow profile 154 (as shown in FIG. 10B ). In particular, the compressible contact member 150 has a hollow cylindrical profile. With the multiple strips 152 having thin sheet-like profile, the multiple strips 152 when joined together impart radial flexibility to the compressible contact member 150.
  • the hollow profile 154 of the compressible contact member 150 adapts (conforms) to an internal profile of the slot 142 of the rigid contact member 140. This way the compressible contact member 150 is positioned inside the slot 142 of the rigid contact member 140. That is, as may be seen from FIG 4 and may be better seen from FIG 10B (as discussed later), the compressible contact member 150 is arranged (sits) within the slot 142 (not shown in FIG 4 ) of the rigid contact member 140. As discussed, the movable contact member 130 linearly translates in the insulated chamber 120 along with the second stem 128 of the vacuum interrupter unit 124 between the first position and the second position.
  • the movable contact member 130 has the hollow cylindrical profile adapted to be received inside the hollow profile 154 of the compressible contact member 150 when the second stem 128 is disposed in the first position thereof.
  • the compressible contact member 150 with its radial flexibility ensures physical connection with the movable contact member 130 when received inside the hollow profile 154 thereof.
  • the compressible contact member 150 may generally be disposed in its relaxed state inside the slot 142 of the rigid contact member 140; and when the movable contact member 130 is received inside the hollow profile 154 thereof, the compressible contact member 150 may compress ensuring physical (and thereby electrical) connection with the movable contact member 130, and also disposing the movable contact member 130 in electrical connection with the rigid contact member 140.
  • the second stem 128 (via the movable contact member 130) may be disposed in electrical engagement with the second connection arm 118b, when the movable contact member 130 is received inside the hollow profile 154 of the compressible contact member 150.
  • the second stem 128 in the first position, the second stem 128 is in electrical engagement with the compressible contact member 150 thereby closing the circuit between the first connection arm 118a and the second connection arm 118b (i.e., disposing the switching device 100 in ON configuration).
  • the second stem 128 is out of electrical engagement with the compressible contact member 150 thereby opening the circuit between the first connection arm 118a and the second connection arm 118b (i.e., disposing the switching device 100 in OFF configuration).
  • the switching device 100 further includes a heat sink 160.
  • FIG 8 illustrates a detailed view of the heat sink 160, in accordance with an embodiment of the present disclosure.
  • the heat sink 160 has a body 162.
  • the heat sink 160 is shown to have the body 162 with a generally hollow cylindrical profile.
  • the body 162 of the heat sink 160 has a slot 166 in the form of a through-hole defined therein.
  • the slot 166 is complementary to the slot 142 of the rigid contact member 140.
  • the heat sink 160 is associated with the rigid contact member 140.
  • the heat sink 160 is arranged with respect to the rigid contact member 140 such that the complementary slot 166 thereof is aligned with the slot 142 of the rigid contact member 140. With the heat sink 160 extending upwardly from the rigid contact member 140, the heat sink 160 is able to guide the movable contact member 130 to be received inside the hollow profile 154 of the compressible contact member 150 when the second stem 128 is disposed in the first position thereof.
  • the heat sink 160 includes a plurality of fins 164 extending radially outwardly from the body 162 thereof.
  • the body 162 and the plurality of fins 164, for the heat sink 160 may be made of a material with high thermal conductivity, so as to allow for dissipation of heat (as discussed later).
  • the heat sink 160, including the body 162 and the plurality of fins 164 may be made of, but not limited to, Aluminum.
  • the heat sink 160 has a portion 168 defined in the body 162 thereof, with no fins (such as, the fins 164) extending therefrom.
  • the said portion 168, of the heat sink 160 has an extension with apertures 169 defined therein.
  • the switching device 100 may also include a connection support member 170.
  • the connection support member 170 has a body 172 which may be made of same material as the body 162 of the heat sink 160 (such as, Aluminum).
  • the body 172 of the connection support member 170 has an arcuate profile conforming to the circular profile of the body 162 of the heat sink 160.
  • connection support member 170 includes a plurality of fins 174 extending from the body 172 thereof.
  • the fins 174 of the connection support member 170 may generally be similar in configuration to the fins 164 of the heat sink 160.
  • the body 172 of the connection support member 170 has apertures 176 defined therein.
  • FIG 10A illustrated is a diagrammatic perspective view of an assembly (represented by reference numeral 180) of the rigid contact member 140 and the heat sink 160, in accordance with an embodiment of the present disclosure.
  • the heat sink 160 is associated with the rigid contact member 140 such that the complementary slot 166 thereof is aligned with the slot 142 (not shown in FIG 10A ) of the rigid contact member 140.
  • the heat sink 160 is mounted to the rigid contact member 140 by using bolts 182 passing through the apertures 148a in the rigid contact member 140 and corresponding apertures (not shown) in the heat sink 160 from one side, and also by using bolts 184 passing through the apertures 148b in the rigid contact member 140 and the corresponding apertures 169 in the heat sink 160 as well as the apertures 176 in the connection support member 170 from other side. Also, referring to FIG 10B , illustrated is a diagrammatic perspective view of an assembly (represented by reference numeral 190) of the rigid contact member 140 and the compressible contact member 150.
  • the compressible contact member 150 is positioned inside the slot 142 (not shown in FIG 10B ) of the rigid contact member 140, to have the hollow profile 154 thereof able to receive the movable contact member 130 therein when the second stem 128 is disposed in the first position thereof.
  • FIG 11 illustrates a detailed view of the vacuum interrupter assembly 122.
  • the vacuum interrupter assembly 122 includes the vacuum interrupter unit 124 having the first end 124a and the second end 124b.
  • the vacuum interrupter unit 124 provides the first stem 126 located at the first end 124a thereof and the second stem 128 located at the second end 124b thereof.
  • the vacuum interrupter assembly 122 further includes the rigid contact member 140.
  • the rigid contact member has the compressible contact member (such as the compressible contact member 150, not shown in FIG 11 ) positioned therein.
  • the second stem 128 of the vacuum interrupter unit 124 is configured to move linearly along an axis 'A' (as shown) between the first position and the second position.
  • the vacuum interrupter assembly 122 includes the movable contact member 130 fixed to the second stem 128 at the second end 124b of the vacuum interrupter unit 124.
  • the movable contact member 130 is received inside the hollow profile of the compressible contact member 150 when the second stem 128 is disposed in the first position thereof.
  • the vacuum interrupter assembly 122 further includes the heat sink 160 associated with the rigid contact member 140 for dissipating heat generated dur to electrical engagement as described above.
  • the compressible contact member 150 acts as a multi-laminated contact and is housed inside the rigid contact member 140, which is fixed and stationary.
  • the compressible contact member 150 provides a current transfer point, and due to its shape eliminating sharp edges (as in traditional design using flexible connection, which can potentially cause dielectric shocks) can withstand and transfer high currents.
  • the rigid contact member 140 having the round shape, particularly at the bottom side thereof, act as an electrode and helps to reduce di-electric stress.
  • the heat sink 160 provides good contact surface area with the rigid contact member 140 to allow for sufficient heat dissipation.
  • the heat sink 160 acts as the guiding element for the movable contact member 130 to be received inside the hollow profile of the compressible contact member 150 when the second stem 128 is disposed in the first position thereof.
  • the compact insulated chamber 120 made of epoxy resin material allows to achieve a higher temperature rise rating for the switching device 100. The simplified design of the switching device 100 also helps in reducing its assembly time.
  • the present disclosure further provides a method of operating a switching device for opening and closing a circuit between a first connection arm and a second connection arm is provided.
  • the present method has been described in view of the elements described in the preceding paragraphs in reference to FIG 2 through FIG 11 .
  • FIG 12 illustrates a flowchart listing steps involved in a method 1200 of operating the switching device 100 for opening and closing a circuit between the first connection arm 118a and the second connection arm 118b, in accordance with an embodiment of the present disclosure.
  • the various teachings as described above apply mutatis mutandis to the present method 1200 as described hereinafter.
  • the method 1200 comprises providing the insulated chamber 120.
  • the method further comprises arranging the vacuum interrupter unit 124 inside the insulated chamber 120, with the vacuum interrupter unit 124 having the first end 124a and the second end 124b, and the vacuum interrupter unit 124 providing the first stem 126 located at the first end 124a thereof and the second stem 128 located at the second end 124b thereof.
  • the method 1200 further comprises disposing the first stem 126 in fixed electrical contact with the first connection arm 118.
  • the method 1200 further comprises providing the rigid contact member 140, with the rigid contact member 140 having the first end 140a and the second end 140b, and a slot 142 defined at the first end 140a thereof and the contact arm 144 defined at the second end 140b thereof.
  • the method 1200 further comprises disposing the contact arm 144 in fixed electrical contact with the second connection arm 118b.
  • the method 1200 further comprises positioning the compressible contact member 150, having the hollow profile, adapting to the internal profile of the slot 142 of the rigid contact member 140, inside the slot 142 of the rigid contact member 140.
  • the method 1200 further comprises reciprocating the second stem 128 of the vacuum interrupter unit 124 to move linearly in the insulated chamber 120 between the first position and the second position.
  • the second stem 128 In the first position, the second stem 128 is in electrical engagement with the compressible contact member 150 thereby closing the circuit between the first connection arm 118a and the second connection arm 118b.
  • the second stem 128 In the second position, the second stem 128 is out of electrical engagement with the compressible contact member 150 thereby opening the circuit between the first connection arm 118a and the second connection arm 118b.
  • the method 1200 also comprises providing the movable contact member 130 fixed to the second stem 128 at the second end 124b of the vacuum interrupter unit 124, with the movable contact member 130 having the profile adapted to be received inside the hollow profile of the compressible contact member 150 when the second stem 128 is disposed in the first position thereof.
  • the method 120 also comprises providing the heat sink 160 having the body 162 with the complementary slot 166 to the slot 142 of the rigid contact member 144.
  • the method 1200 further comprises associating the heat sink 160 with the rigid contact member 140 such that the complementary slot 166 thereof is aligned with the slot 142 of the rigid contact member 140, and thereby guide the movable contact member 130 to be received inside the hollow profile of the compressible contact member 150 when the second stem 128 is disposed in the first position thereof.
  • the switching device 100 of the present disclosure may also allow use of eco-friendly insulating gas, such as, Sulfur hexafluoride (SF6) free gas or a mixture of carbon dioxide gas and nitrogen gas (CO2N2) instead of using insulating gases with high dielectric strength but toxic to environment (such as SF6), without causing dielectric breakdown.
  • eco-friendly insulating gas such as, Sulfur hexafluoride (SF6) free gas or a mixture of carbon dioxide gas and nitrogen gas (CO2N2) instead of using insulating gases with high dielectric strength but toxic to environment (such as SF6), without causing dielectric breakdown.
  • switchgear device 10 housing 12 top contact arm 14 bottom contact arm 16 vacuum interrupter based circuit breaker 20 vacuum interrupter fixed stem 22 vacuum interrupter (VI) moving stem 24 flexible connection 26 switching device 100 housing 102 pole assembly 104 control panel 106 enclosure 108 bus-bar enclosure 110 circuit-breaker enclosure 112 transformer enclosure 114 cable bushing enclosure 116 first connection arm 118a second connection arm 118b insulated chamber 120 vacuum interrupter assembly 122 vacuum interrupter unit 124 first end of vacuum interrupter unit 124a second end of vacuum interrupter unit 124b first stem 126 second stem 128 movable contact member 130 body 132 through-hole 134 rigid contact member 140 first end of rigid contact member 140a second end of rigid contact member 140b slot 142 contact arm 144 apertures 146 fastening members 147 apertures 148a apertures 148b compressible contact member 150 strips 152 hollow profile 154 heat sink 160 body of heat sink 162 fins 164 slot 166 portion 168 apertures 169 connection support member 170 body of connection support member 172 fins 174 apertures

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)

Claims (15)

  1. Dispositif de commutation (100) destiné à ouvrir et fermer un circuit entre un premier bras de connexion (118a) et un deuxième bras de connexion (118b), le dispositif de commutation (100) comprenant :
    une chambre isolée (120) ; et
    une unité d'interrupteur à vide (124) agencée à l'intérieur de la chambre isolée (120) et présentant une première extrémité (124a) et une deuxième extrémité (124b), l'unité d'interrupteur à vide (124) fournissant une première tige (126) située à sa première extrémité (124a) et une deuxième tige (128) située à sa deuxième extrémité (124b), la première tige (126) étant disposée en contact électrique fixe avec le premier bras de connexion (118a) ;
    un organe de contact rigide (140) présentant une première extrémité (140a) et une deuxième extrémité (140b), l'organe de contact rigide (140) présentant une fente (142) définie à sa première extrémité (140a) et un bras de contact (144) défini à sa deuxième extrémité (140b), le bras de contact (144) étant disposé en contact électrique fixe avec le deuxième bras de connexion (118b) ;
    un organe de contact compressible (150) présentant un profil creux (154) s'adaptant à un profil interne de la fente (142) de l'organe de contact rigide (140), l'organe de contact compressible (150) étant positionné à l'intérieur de la fente (142) de l'organe de contact rigide (140) ; et
    la deuxième tige (128) de l'unité d'interrupteur à vide (124) étant configurée pour se déplacer linéairement dans la chambre isolée (120) entre une première position et une deuxième position ; dans la première position, la deuxième tige (128) étant en engagement électrique avec l'organe de contact compressible (150), fermant ainsi le circuit entre le premier bras de connexion (118a) et le deuxième bras de connexion (118b), et caractérisé en ce que, dans la deuxième position, la deuxième tige (128) est hors d'engagement électrique avec l'organe de contact compressible (150), ouvrant ainsi le circuit entre le premier bras de connexion (118a) et le deuxième bras de connexion (118b) .
  2. Dispositif de commutation (100) selon la revendication 1, comprenant en outre un organe de contact mobile (130) fixé à la deuxième tige (128) à la deuxième extrémité (124b) de l'unité d'interrupteur à vide (124), l'organe de contact mobile (130) présentant un profil adapté à être reçu à l'intérieur du profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
  3. Dispositif de commutation (100) selon la revendication 2, dans lequel l'organe de contact compressible (150) est formé de multiples bandes (152) d'un matériau conducteur solidarisées entre elles pour leur conférer une flexibilité radiale, et assurant une connexion physique avec l'organe de contact mobile (130) lorsqu'il est reçu à l'intérieur de son profil creux (154).
  4. Dispositif de commutation (100) selon la revendication 2, comprenant en outre un dissipateur thermique (160) présentant un corps (162) pourvu d'une fente complémentaire (166) à la fente (142) de l'organe de contact rigide (140), le dissipateur thermique (160) étant associé à l'organe de contact rigide (140) de sorte que sa fente complémentaire (166) soit alignée avec la fente (142) de l'organe de contact rigide (140), pour ainsi guider l'organe de contact mobile (130) pour qu'il soit reçu à l'intérieur du profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
  5. Dispositif de commutation (100) selon la revendication 4, dans lequel le dissipateur thermique (160) comprend une pluralité d'ailettes (164) s'étendant radialement vers l'extérieur à partir de son corps (162).
  6. Dispositif de commutation (100) selon la revendication 1, dans lequel la chambre isolée (120) est en matériau à base de résine époxy.
  7. Ensemble d'interrupteur à vide (122) pour un dispositif de commutation (100), l'ensemble d'interrupteur à vide (122) comprenant :
    une unité d'interrupteur à vide (124) présentant une première extrémité (124a) et une deuxième extrémité (124b), l'unité d'interrupteur à vide (124) fournissant une première tige (126) située à sa première extrémité (124a) et une deuxième tige (128) située à sa deuxième extrémité (124b) ;
    un organe de contact rigide (140) présentant une première extrémité (140a) et une deuxième extrémité (140b), l'organe de contact rigide (140) présentant une fente (142) définie à sa première extrémité (140a) et un bras de contact (144) défini à sa deuxième extrémité (140b) ; et
    un organe de contact compressible (150) présentant un profil creux (154) s'adaptant à un profil interne de la fente (142) de l'organe de contact rigide (140), l'organe de contact compressible (150) étant positionné à l'intérieur de la fente (142) de l'organe de contact rigide (140) ;
    la deuxième tige (128) de l'unité d'interrupteur à vide (124) étant configurée pour se déplacer linéairement entre une première position et une deuxième position ; dans la première position, la deuxième tige (128) étant en engagement électrique avec l'organe de contact compressible (150), et caractérisé en ce que, dans la deuxième position, la deuxième tige (128) est hors d'engagement électrique avec l'organe de contact compressible (150).
  8. Ensemble d'interrupteur à vide (122) selon la revendication 7, comprenant en outre un organe de contact mobile (130) fixé à la deuxième tige (128) à la deuxième extrémité (124b) de l'unité d'interrupteur à vide (124), l'organe de contact mobile (130) présentant un profil adapté à être reçu à l'intérieur du profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
  9. Ensemble d'interrupteur à vide (122) selon la revendication 8, dans lequel l'organe de contact compressible (150) est formé de multiples bandes (152) d'un matériau conducteur solidarisées entre elles pour leur conférer une flexibilité radiale, et assurant une connexion physique avec l'organe de contact mobile (130) lorsqu'il est reçu à l'intérieur de son profil creux (154).
  10. Ensemble d'interrupteur à vide (122) selon la revendication 8, comprenant en outre un dissipateur thermique (160) présentant un corps (162) pourvu d'une fente complémentaire (166) à la fente (142) de l'organe de contact rigide (140), le dissipateur thermique (160) étant associé à l'organe de contact rigide (140) de sorte que sa fente complémentaire (166) soit alignée avec la fente (142) de l'organe de contact rigide (140), pour ainsi guider l'organe de contact mobile (130) pour qu'il soit reçu à l'intérieur du profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
  11. Ensemble d'interrupteur à vide (122) selon la revendication 10, dans lequel le dissipateur thermique (160) comprend une pluralité d'ailettes (164) s'étendant radialement vers l'extérieur à partir de son corps (162).
  12. Ensemble d'interrupteur à vide (122) selon la revendication 8, dans lequel l'organe de contact mobile (130) présente un profil cylindrique creux adapté à être reçu à l'intérieur d'un profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
  13. Procédé (1200) de fonctionnement d'un dispositif de commutation (100) destiné à ouvrir et fermer un circuit entre un premier bras de connexion (118a) et un deuxième bras de connexion (118b), le procédé (1200) comprenant :
    la fourniture d'une chambre isolée (120) ; et
    l'agencement d'une unité d'interrupteur à vide (124) à l'intérieur de la chambre isolée (120), l'unité d'interrupteur à vide (124) présentant une première extrémité (124a) et une deuxième extrémité (124b), l'unité d'interrupteur à vide (124) fournissant une première tige (126) située à sa première extrémité (124a) et une deuxième tige (128) située à sa deuxième extrémité (124b) ;
    la disposition de la première tige (126) en contact électrique fixe avec le premier bras de connexion (118a) ;
    la fourniture d'un organe de contact rigide (140), l'organe de contact rigide (140) présentant une première extrémité (140a) et une deuxième extrémité (140b), et une fente (142) définie au niveau de sa première extrémité (140a) et un bras de contact (144) défini au niveau de sa deuxième extrémité (140b) ;
    la disposition du bras de contact (144) en contact électrique fixe avec le deuxième bras de connexion (118b) ;
    le positionnement d'un organe de contact compressible (150), présentant un profil creux (154) s'adaptant à un profil interne de la fente (142) de l'organe de contact rigide (140), à l'intérieur de la fente (142) de l'organe de contact rigide (140) ; et
    la mise en va-et-vient de la deuxième tige (128) de l'unité d'interrupteur à vide (124) afin de la déplacer linéairement dans la chambre isolée (120) entre une première position et une deuxième position ; dans la première position, la deuxième tige (128) étant en engagement électrique avec l'organe de contact compressible (150), fermant ainsi le circuit entre le premier bras de connexion (118a) et le deuxième bras de connexion (118b), et caractérisé en ce que, dans la deuxième position, la deuxième tige (128) est hors d'engagement électrique avec l'organe de contact compressible (150), ouvrant ainsi le circuit entre le premier bras de connexion (118a) et le deuxième bras de connexion (118b) .
  14. Procédé (1200) selon la revendication 13, comprenant en outre la fourniture d'un organe de contact mobile (130) fixé à la deuxième tige (128) à la deuxième extrémité (124b) de l'unité d'interrupteur à vide (124), l'organe de contact mobile (130) présentant un profil adapté à être reçu à l'intérieur du profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
  15. Procédé (1200) selon la revendication 14, comprenant en outre :
    la fourniture d'un dissipateur thermique (160) présentant un corps (162) pourvu d'une fente complémentaire (166) à la fente (142) de l'organe de contact rigide (140) ;
    l'association du dissipateur thermique (160) à l'organe de contact rigide (140) de sorte que sa fente complémentaire (166) soit alignée avec la fente (142) de l'organe de contact rigide (140), pour ainsi guider l'organe de contact mobile (130) pour qu'il soit reçu à l'intérieur du profil creux (154) de l'organe de contact compressible (150) lorsque la deuxième tige (128) est disposée dans sa première position.
EP22159258.7A 2022-02-28 2022-02-28 Dispositif de commutation, ensemble interrupteur à vide et procédé de fonctionnement d'un dispositif de commutation pour la distribution d'électricité Active EP4235721B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22159258.7A EP4235721B1 (fr) 2022-02-28 2022-02-28 Dispositif de commutation, ensemble interrupteur à vide et procédé de fonctionnement d'un dispositif de commutation pour la distribution d'électricité

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Application Number Priority Date Filing Date Title
EP22159258.7A EP4235721B1 (fr) 2022-02-28 2022-02-28 Dispositif de commutation, ensemble interrupteur à vide et procédé de fonctionnement d'un dispositif de commutation pour la distribution d'électricité

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EP4235721B1 true EP4235721B1 (fr) 2026-01-21

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005297A (en) * 1972-10-18 1977-01-25 Westinghouse Electric Corporation Vacuum-type circuit interrupters having heat-dissipating devices associated with the contact structures thereof
DE102007038898B3 (de) * 2007-08-13 2008-11-20 Siemens Ag Schalteranordnung für eine Schaltanlage
CN112635205B (zh) * 2020-11-24 2024-08-23 天津平高智能电气有限公司 一种开关柜用静触头及开关柜

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