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
  • H01H33/02—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
  • H01H33/125—Load break switches comprising a separate circuit breaker
• • 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
  • H01H33/027—Integrated apparatus for measuring current or voltage
• • 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
  • H01H33/666—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
  • H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
  • H01H31/003—Earthing 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
  • H01H33/02—Details
  • H01H33/022—Details particular to three-phase circuit breakers

Definitions

• the technical reference field of the present invention refers to switchboards or electricity substations, particularly medium/high voltage ones, which receive voltage from relevant voltage busbars and supply current through lines directed to downstream users.
• the technical field of the present invention refers to a switch-disconnector group for electric cabinets, which is configured to be placed between the aforementioned voltage busbars and the supply lines.
• the present invention will address the problem of how to provide a switch-disconnector group with reduced size.
• switch-disconnector group for an electric cabinet or switchboard.
• switch-disconnector groups the devices making them up, and the functions thereof are well known to a person skilled in the art.
• Prior art patents EP1538650 and EP1226596 can be mentioned by way of example as evidence of the familiarity with these groups and of the knowledge of the person skilled in the art.
• a switch-disconnector group comprises three first connectors connected to the voltage busbar (which can act as an input port for the group) and three second connectors connected to the utility line (which can act as a power supply port) .
• a switch-disconnector group comprises a disconnector device and three switch devices between these first and second connectors.
• the disconnector device as is well known, is selectively switchable in at least two configurations wherein in a first configuration it connects the first connectors to the switch devices.
• the switch devices in turn are connected to the second connectors.
• interrupter switches are known to be used in these groups. These interrupter switches comprise a cylindrical casing in which a vacuum is created. Two flat surfaces are arranged in the casing orthogonal to the axis, closely facing each other so that current flows when the switch is powered by the disconnector. Usually, the flat surface on the side of the disconnector is movable (e.g., on a bellows structure) whereas the opposite flat surface is fixed and transfers current to the end of the switch coupled to the corresponding output connector.
• the second connector is aligned with the corresponding interrupter switch, making some kind of extension of the switch itself.
• the first disadvantage relates to the large overall size of the group along the axis of the switch
• the second disadvantage relates to the fact that if the second connectors were to be provided with accessory electronic devices, such as sensors or the like, the overall size of the group along the axis of the switch would be further increased.
• WO2019025032 describes a switch group comprising a vacuum interrupter for a gas-insulated electric cabinet.
• US3571543 describes an electrical drive mechanism for a gas-insulated switch group.
• DE4412784 describes a switch-disconnector group according to the preamble of claim 1 and a combined current and voltage sensor for a high voltage switchgear panel.
• one object of the present invention is to provide an inventive switch-disconnector group, particularly for electric cabinets, which can overcome the described drawbacks of the prior art.
• the main object of the present invention is to provide a switch-disconnector group with interrupter switches which, on the one hand, offers the same (if not better) functions as the known groups and, on the other hand, has a reduced size along the axis of the switches.
• the present invention will also offer the possibility of incorporating sensors into the second connectors with no increase whatsoever in the size of the group along the axis of the interrupter switches.
• a switch-disconnector group for electric cabinets of the type comprising:
• the main aspect of the present invention relates to the correlation between the axis of each second connector and the axis of the corresponding interrupter switch device.
• these axes do not coincide and therefore the second connector does not in fact constitute an extension of the interrupter switch device along its axis. Having misaligned the second connector from the corresponding interrupter switch device, they can be arranged laterally to each other, thereby reducing the size.
• each second connector and the axis of the corresponding interrupter switch device are parallel to each other.
• each second connector comprises a free end and an inner end coupled to the corresponding switch device, wherein the voltage sensor is made in the form of a ring fitted on a cylindrical support protruding from the inner end of the second connector.
• each interrupter switch device comprises an inner end selectively connected to the disconnector device, and an outer end, wherein each outer end and each inner end of the corresponding switch device and second connector are substantially aligned, i.e., in a common plane orthogonal to the axis of the interrupter switch device.
• each outer end and each inner end of the corresponding switch device and second connector are connected by a flexible connection device suitable for absorbing any misalignment.
• a flexible connection device can be made in the form of one or more (possibly flexible) conductive sheets suitable for compensating for any misalignments created during assembly.
• the axes of the second connectors coincide with the axes of the first connectors.
• the inputs and outputs are aligned whereas the switches are misaligned.
• the second connectors and the corresponding switch devices are arranged along two parallel rows.
• the disconnector device is housed in a box body (therefore in a closed, protected environment possibly suitably filled with gas) whereas the connectors are freely exposed.
• each first connector is housed in a corresponding insulator body coupled to a first side of the box body whereas each second connector and the corresponding switch device are housed in a corresponding second insulator body coupled to a second opposite side of the box body.
• the disconnector not only the disconnector but also the connectors are inside a containment body and therefore they too are possibly housed in a closed and protected environment possibly suitably filled with gas.
• Figure 1 is a schematic view of an example of a switch-disconnector group according to the present invention.
• the switch-disconnector group is indicated, as a whole, with the reference number 1.
• this group 1 is suitable for being inserted in an electrical cabinet where a voltage busbar and a utility line are present.
• the group 1 comprises a box body 2 which only partially houses the components of the group.
• first connectors 5 can act as input connectors configured to be coupled to the voltage busbar to power the group 1.
• These second connectors 7 can serve as output connectors configured to be coupled to the output line for current supply.
• the insulators 16 and 17 are coupled to the box body 2 and the latter is made in the form of two half-shells welded together to provide a sealed chamber which is preferably filled with a suitable gas.
• FIG 2 is a schematic cross-section view of the group in Figure 1 along the plane II indicated in Figure 1 and allows the elements housed in the box body and insulators 16 and 17 to be seen.
• Figure 3 allows for a better disclosure of the details related to the elements housed in the insulator 17 (the one housing the second connector 7).
• each output insulator 17 also houses an interrupter switch device 4 (known per se).
• the axis A3 of each second connector 7 does not coincide with the axis A1 of the corresponding switch device 4.
• these axes are parallel to each other and separated by a distance indicated with D.
• each second connector 7 comprises an inner end 12 aligned with, i.e., approximately in the same plane orthogonal to the axis A1, and connected to an outer end 14 of the corresponding switch device 4.
• This connection is shown in this figure by a flat metal sheet 15 which can absorb any misalignment.
• This sheet can also be s-shaped to further place the inner end 12 of the second connector 7 at a lower height and thus offer greater compactness.
• this connection could also be flexible so that it can adapt to any misalignment present during assembly.
• Reference number 18 indicates a ring nut that may (or may not) be used as a possible solution to the need to keep the gas within the casing.
• the disconnector device 3 is in the form of a lever 19 which can rotate to selectively be coupled to an earth terminal 20 or a terminal 21 connected to the inner end 13 of the switch devices 4.
• the axes A3 and A2 are aligned.
• Figure 3 shows a distance D between the axis A3 of the second connector 7 and the axis A1 of the corresponding switch device 4.
• This distance D is such that a cylindrical support 10, on which to fit a voltage sensor 9 configured to detect the voltage present in the corresponding second connector 7, can be coupled to the inner end 12 of the connector 7.
• the voltage sensor 9 is made in the form of a ring fitted on the cylindrical support 10.
• Reference number 22 indicates the connection line of the signal between the inside and outside of the sensor 9. This connection can be made in the form of an elastic thin plate.
• the assembly of the group is also simple. It is possible, in fact, to pre-assemble switches and second connectors together. Couple these to the half-shell of the box body and then place the insulator 17, which is possibly pre-assembled with the half-shell 8. The final step is tightening the ring nut 18.

Landscapes

• Gas-Insulated Switchgears (AREA)
• Switch Cases, Indication, And Locking (AREA)

Priority Applications (1)

Applications Claiming Priority (1)

Publications (3)

Family

ID=82100686

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (8)

• 2022
  • 2022-04-01 IT IT102022000006524A patent/IT202200006524A1/it unknown
• 2023
  • 2023-03-31 PL PL23165803.0T patent/PL4254458T3/pl unknown
  • 2023-03-31 EP EP23165803.0A patent/EP4254458B1/en active Active
  • 2023-03-31 RS RS20251219A patent/RS67466B1/sr unknown
  • 2023-03-31 ES ES23165803T patent/ES3057165T3/es active Active

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