EP4293696A1 - Mittelspannungs- oder hochspannungsanordnung - Google Patents

Mittelspannungs- oder hochspannungsanordnung Download PDF

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Publication number
EP4293696A1
EP4293696A1 EP22179003.3A EP22179003A EP4293696A1 EP 4293696 A1 EP4293696 A1 EP 4293696A1 EP 22179003 A EP22179003 A EP 22179003A EP 4293696 A1 EP4293696 A1 EP 4293696A1
Authority
EP
European Patent Office
Prior art keywords
control element
field control
high voltage
medium voltage
voltage equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22179003.3A
Other languages
English (en)
French (fr)
Inventor
Christian Reuber
Dietmar Gentsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Schweiz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP22179003.3A priority Critical patent/EP4293696A1/de
Publication of EP4293696A1 publication Critical patent/EP4293696A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66261—Specific screen details, e.g. mounting, materials, multiple screens or specific electrical field considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings

Definitions

  • the present invention relates to a medium voltage or high voltage equipment, a field control element, a method of manufacturing a medium voltage or high voltage equipment, and a method of providing field control for a medium voltage or high voltage equipment.
  • MV and HV equipment often uses combinations of conducting material and several insulating gases and / or solid insulating materials that can have different dielectric constants.
  • triple points can show strongly increased dielectric stress, for example a connection of a conductor to a solid insulator that is surrounded by air, when the dielectric constant of the solid insulator is higher than the dielectric constant of the surrounding air.
  • a medium voltage or high voltage equipment comprising:
  • the first part is formed from an electrically conducting material.
  • the second part is formed from an electrically insulating material.
  • the first part is connected to the second part at a junction.
  • the medium voltage or high voltage equipment is configured such that the first part can be held at an operational voltage.
  • the field control element is formed from a conducting material. The field control element is located in contact with an outer surface of the first part, and the field control element is located adjacent to the junction.
  • the first part where it connects to the second part has a circular cross section
  • the second part where it connects to the first part has a circular cross section.
  • the junction is formed from the connection of the circular cross section of the first part with the circular cross section of the second part.
  • the field control element encircles the first part.
  • the field control element is located in contact with the outer surface of the first part around an outer circumference of the first part. Before being located in contact with the outer surface of the first part an inner circumference of the field control element is less than the outer circumference of the first part.
  • the field control element is located such that it does not contact the second part.
  • the field control element has a substantially toroidal shape.
  • the field control element comprises a spiral wire, a spiral contact or a spiral spring.
  • the medium voltage or high voltage equipment further comprises an insulating medium.
  • the insulating medium encapsulates at least the first part, the second part and the field control element.
  • the medium voltage or high voltage equipment further comprises a third part.
  • the third part is formed from a conducting material.
  • the third part is connected to the second part at a second junction.
  • the medium voltage or high voltage equipment is configured such that an operational potential difference can be applied between the first part and the third part.
  • the medium voltage or high voltage equipment further comprises a second field control element.
  • the second field control element is formed from a conducting material.
  • the second field control element is located in contact with an outer surface of the third part, and the second field control element is located adjacent to the second junction.
  • the first part, the second part and the field control element form at least part of a vacuum interrupter.
  • the medium voltage or high voltage equipment further comprises a pole housing.
  • the vacuum interrupter is located inside the pole housing, and a gap between the vacuum interrupter and the pole housing is filled with an insulating material.
  • a field control element for a medium voltage or high voltage equipment.
  • the medium voltage or high voltage equipment comprises a first part, and a second part.
  • the first part is formed from a conducting material.
  • the second part is formed from an insulating material.
  • the first part is connected to the second part at a junction.
  • the medium voltage or high voltage equipment is configured such that the first part can be held at an operational voltage.
  • the field control element is formed from a conducting material.
  • the field control element is configured to be located in contact with an outer surface of the first part adjacent to the junction.
  • a method of manufacturing a medium voltage or high voltage equipment comprising:
  • a method of providing field control for a medium voltage or high voltage equipment comprises a first part, and a second part.
  • the first part is formed from a conducting material
  • the second part is formed from an insulating material.
  • the first part is connected to the second part at a junction.
  • the medium voltage or high voltage equipment is configured such that the first part can be held at an operational voltage.
  • the method comprises locating a field control element in contact with an outer surface of the first part adjacent to the junction, and the field control element is formed from a conducting material.
  • a new medium voltage or high voltage equipment, a new field control element, a new method of manufacturing a medium voltage or high voltage equipment, and a new method of providing field control for a medium voltage or high voltage equipment are now described.
  • a medium voltage or high voltage equipment comprises a first part 20, a second part 10, and a field control element 100.
  • the first part is formed from a conducting material.
  • the second part is formed from an insulating material.
  • the first part is connected to the second part at a junction.
  • the medium voltage or high voltage equipment is configured such that the first part can be held at an operational voltage.
  • the field control element is formed from a conducting material. The field control element is located in contact with an outer surface of the first part, and the field control element is located adjacent to the junction.
  • the first part where it connects to the second part has a circular cross section
  • the second part where it connects to the first part has a circular cross section.
  • the junction is formed from the connection of the circular cross section of the first part with the circular cross section of the second part.
  • the field control element encircles the first part.
  • the field control element is located in contact with the outer surface of the first part around an outer circumference of the first part. Before being located in contact with the outer surface of the first part an inner circumference of the field control element is less than the outer circumference of the first part.
  • the field control element is located such that it does not contact the second part.
  • the field control element has a substantially circular cross section.
  • the field control element has a substantially annular cross section.
  • the field control element has a ring shape.
  • the field control element has a substantially toroidal shape.
  • the field control element comprises a spiral wire, a spiral contact or a spiral spring.
  • the medium voltage or high voltage equipment further comprises an insulating medium.
  • the insulating medium encapsulates at least the first part, the second part and the field control element.
  • the medium voltage or high voltage equipment further comprises a third part 30.
  • the third part is formed from a conducting material.
  • the third part is connected to the second part at a second junction.
  • the medium voltage or high voltage equipment is configured such that an operational potential difference can be applied between the first part and the third part.
  • the medium voltage or high voltage equipment further comprises a second field control element.
  • the second field control element is formed from a conducting material.
  • the second field control element is located in contact with an outer surface of the third part, and the second field control element is located adjacent to the second junction.
  • the first part, the second part and the field control element form at least part of a vacuum interrupter.
  • the medium voltage or high voltage equipment further comprises a pole housing.
  • the vacuum interrupter is located inside the pole housing, and a gap between the vacuum interrupter and the pole housing is filled with an insulating material.
  • the medium voltage or high voltage equipment is configured to operate in an air or gas environment.
  • the dielectric constant of the insulating material of the second part is greater than the dielectric constant of air or the gas.
  • a field control element 100 can be retrofitted to a medium voltage or high voltage equipment.
  • the medium voltage or high voltage equipment comprises a first part 20, and a second part 10.
  • the first part is formed from a conducting material
  • the second part is formed from an insulating material.
  • the first part is connected to the second part at a junction.
  • the medium voltage or high voltage equipment is configured such that the first part can be held at an operational voltage.
  • the field control element is formed from a conducting material; and the field control element is configured to be located in contact with an outer surface of the first part adjacent to the junction.
  • the first part where it connects to the second part has a circular cross section
  • the second part where it connects to the first part has a circular cross section.
  • the junction is formed from the connection of the circular cross section of the first part with the circular cross section of the second part.
  • the field control element is configured to encircle the first part when it is located in contact with the outer surface of the first part adjacent to the junction.
  • the field control element is configured to be located in contact with the outer surface of the first part around an outer circumference of the first part. Before being located in contact with the outer surface of the first part an inner circumference of the field control element is less than the outer circumference of the first part.
  • the field control element is configured to be located such that it does not contact the second part.
  • the field control element has a substantially circular cross section.
  • the field control element has a substantially annular cross section.
  • the field control element has a substantially toroidal shape.
  • the field control element comprises a spiral wire, a spiral contact or a spiral spring.
  • the medium voltage or high voltage equipment further comprises a third part 30.
  • the third part is formed from a conducting material.
  • the third part is connected to the second part at a second junction.
  • the medium voltage or high voltage equipment is configured such that an operational potential difference can be applied between the first part and the third part.
  • the first part, the second part and the field control element form at least part of a vacuum interrupter.
  • the medium voltage or high voltage equipment is configured to operate in an air or gas environment.
  • the dielectric constant of the insulating material of the second part is greater than the dielectric constant of air or the gas.
  • a method of manufacturing a medium voltage or high voltage equipment comprises:
  • the first part where it connects to the second part has a circular cross section
  • the second part where it connects to the first part has a circular cross section.
  • the junction is formed from the connection of the circular cross section of the first part with the circular cross section of the second part.
  • the method comprises encircling the first part with the field control element.
  • the field control element is located in contact with the outer surface of the first part around an outer circumference of the first part. Before being located in contact with the outer surface of the first part an inner circumference of the field control element is less than the outer circumference of the first part.
  • the method comprises locating the field control element such that it does not contact the second part.
  • the field control element has a substantially circular cross section.
  • the field control element has a substantially annular cross section.
  • the field control element has a substantially toroidal shape.
  • the field control element comprises a spiral wire, a spiral contact or a spiral spring.
  • the method comprises encapsulating at least the first part, the second part and the field control element with an insulating medium.
  • the method comprises connecting a third part to the second part at a second junction.
  • the third part is formed from a conducting material, and once manufactured the medium voltage or high voltage equipment is configured such that an operational potential difference can be applied between the first part and the third part.
  • the method comprises locating a second field control element in contact with an outer surface of the third part adjacent to the second junction, and wherein the second field control element is formed from a conducting material.
  • the first part, the second part and the field control element form at least part of a vacuum interrupter.
  • the method comprises locating the vacuum interrupter inside a pole housing, and filling a gap between the vacuum interrupter and the pole housing with an insulating material.
  • the medium voltage or high voltage equipment once manufactured is configured to operate in an air or gas environment.
  • the dielectric constant of the insulating material of the second part is greater than the dielectric constant of air or the gas.
  • a method of providing field control for a medium voltage or high voltage equipment via utilization of a field control element 100 is as follows.
  • the medium voltage or high voltage equipment comprises a first part 20, and a second part 10.
  • the first part is formed from a conducting material
  • the second part is formed from an insulating material.
  • the first part is connected to the second part at a junction.
  • the medium voltage or high voltage equipment is configured such that the first part can be held at an operational voltage.
  • the method comprises locating a field control element 100 in contact with an outer surface of the first part adjacent to the junction, and the field control element is formed from a conducting material.
  • the first part where it connects to the second part has a circular cross section
  • the second part where it connects to the first part has a circular cross section.
  • the junction is formed from the connection of the circular cross section of the first part with the circular cross section of the second part.
  • the method comprises encircling the first part with the field control element when it is located in contact with the outer surface of the first part adjacent to the junction.
  • an inner circumference of the field control element is less than an outer circumference of the first part.
  • the method comprises locating the field control element such that it does not contact the second part.
  • the field control element has a substantially circular cross section.
  • the field control element has a substantially annular cross section.
  • the field control element has a substantially toroidal shape.
  • the field control element comprises a spiral wire, a spiral contact or a spiral spring.
  • the medium voltage or high voltage equipment further comprises a third part 30.
  • the third part is formed from a conducting material.
  • the third part is connected to the second part at a second junction.
  • the medium voltage or high voltage equipment is configured such that an operational potential difference can be applied between the first part and the third part.
  • the first part, the second part and the field control element form at least part of a vacuum interrupter.
  • the medium voltage or high voltage equipment is configured to operate in an air or gas environment.
  • the dielectric constant of the insulating material of the second part is greater than the dielectric constant of air or the gas.
  • the following relates to a field control element in the form of a standard spiral wire or spiral contact or spiral spring used for electrically shielding triple points..
  • Fig. 2 shows a typical MV vacuum interrupter (VI) as an example for the creation of a triple point.
  • the insulating ceramic 10 also called second part
  • the insulating ceramic 10 is connected to the upper and lower lid 20, 30 (also called first and third parts) that are made from conductive sheet metal.
  • upper and lower terminals 40, 50 can be seen.
  • the triple point 60 is the connection of the ceramic to the upper lid (there is also another triple point at the connection of the ceramics to the lower lid).
  • Fig. 1 shows the same VI where the region of the triple point 60 is shielded by a standard spiral wire ring 100 (also called a field control element).
  • spiral wires have been widely being used in MV but for other purposes. They typically do not have to be designed for a certain application, and they can easily be added to the VI.
  • the electrical contact to the lid is established automatically when the inner diameter of the spiral wire is smaller than the diameter of the lid. The spring property of the spiral contact will generate some contact force to maintain the electrical contact also in case of vibrations and temperature changes.
  • Fig. 3 shows a field calculation of this region, where there is no field control element 100 present.
  • 10 is a section of the ceramic
  • 20 is a section of the upper lid
  • 60 is the triple point where 10 and 20 touch.
  • the upper lid 20 is charged to the operation voltage.
  • 70 is an earthed reference plate.
  • the lines from line 80 to the right are equipotential lines that are running in air in this example. It can be seen that the first equipotential line 80 passes closely to the triple point 60. This will result in a relatively high dielectric stress in the region of the triple point 60. The result can be that a certain dielectric rating cannot be fulfilled or that partial discharges occur.
  • Fig. 4 shows a field calculation of the same region with spiral wire (field control element) 100 present.
  • the conductive spiral wire takes over the electric potential from the upper lid 20 and forces the first equipotential line 80 away from the triple point.
  • the dielectric stress in that region is reduced.
  • the result is a certain dielectric rating can be fulfilled and that the occurrence of partial discharges is prevented.

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  • Emergency Protection Circuit Devices (AREA)
EP22179003.3A 2022-06-14 2022-06-14 Mittelspannungs- oder hochspannungsanordnung Pending EP4293696A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22179003.3A EP4293696A1 (de) 2022-06-14 2022-06-14 Mittelspannungs- oder hochspannungsanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22179003.3A EP4293696A1 (de) 2022-06-14 2022-06-14 Mittelspannungs- oder hochspannungsanordnung

Publications (1)

Publication Number Publication Date
EP4293696A1 true EP4293696A1 (de) 2023-12-20

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ID=82058182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22179003.3A Pending EP4293696A1 (de) 2022-06-14 2022-06-14 Mittelspannungs- oder hochspannungsanordnung

Country Status (1)

Country Link
EP (1) EP4293696A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169633U (ja) * 1982-05-10 1983-11-12 日新電機株式会社 真空バルブ
JP2005197061A (ja) * 2004-01-06 2005-07-21 Mitsubishi Electric Corp 複合絶縁スイッチギヤ
US20100000973A1 (en) * 2008-06-30 2010-01-07 Hitachi, Ltd. Vacuum switch and vacuum switchgear
JP2011060532A (ja) * 2009-09-09 2011-03-24 Toshiba Corp モールド真空バルブ
EP3214709A1 (de) * 2014-10-30 2017-09-06 Hitachi Industrial Equipment Systems Co., Ltd. Schaltanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169633U (ja) * 1982-05-10 1983-11-12 日新電機株式会社 真空バルブ
JP2005197061A (ja) * 2004-01-06 2005-07-21 Mitsubishi Electric Corp 複合絶縁スイッチギヤ
US20100000973A1 (en) * 2008-06-30 2010-01-07 Hitachi, Ltd. Vacuum switch and vacuum switchgear
JP2011060532A (ja) * 2009-09-09 2011-03-24 Toshiba Corp モールド真空バルブ
EP3214709A1 (de) * 2014-10-30 2017-09-06 Hitachi Industrial Equipment Systems Co., Ltd. Schaltanlage

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