EP1026703A2 - Conducteur refroidi par liquide - Google Patents

Conducteur refroidi par liquide Download PDF

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Publication number
EP1026703A2
EP1026703A2 EP00660014A EP00660014A EP1026703A2 EP 1026703 A2 EP1026703 A2 EP 1026703A2 EP 00660014 A EP00660014 A EP 00660014A EP 00660014 A EP00660014 A EP 00660014A EP 1026703 A2 EP1026703 A2 EP 1026703A2
Authority
EP
European Patent Office
Prior art keywords
coolant
conductor
conducting part
insulating part
flow channel
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.)
Withdrawn
Application number
EP00660014A
Other languages
German (de)
English (en)
Other versions
EP1026703A3 (fr
Inventor
Erkki Miettinen
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 Industry Oy
Original Assignee
ABB Industry Oy
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 Industry Oy filed Critical ABB Industry Oy
Publication of EP1026703A2 publication Critical patent/EP1026703A2/fr
Publication of EP1026703A3 publication Critical patent/EP1026703A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
    • H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
    • H01B7/423—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid

Definitions

  • the present invention relates to a liquid cooled conductor according to the preamble of claim 1 and a method for using liquid to cool a conductor, according to the preamble of claim 6.
  • One common cooling method is to manufacture the conductor used in the windings from a hollow material, such as copper piping, inside which the liquid used for cooling flows, transferring the waste heat away from where it arises. Water is usually used as the coolant.
  • the water used as the coolant is in direct contact with the charged winding material, so that the impure water electrolyses and begins to conduct electricity.
  • other electrically conductive components in the cooling circuit such as pipes, pumps, and heat exchangers, which are in contact with the cooling water, also become charged.
  • the electrical conductivity of the cooling water is also detrimental in applications, in which the winding is divided into several parts with different potentials, which differences in potential prevent the same cooling water from being used throughout.
  • the invention is intended to eliminate the defects of the state of the art disclosed above and for this purpose create an entirely new type of liquid cooled conductor.
  • the invention is based on placing an insulating pipe or similar made from a non-conducting material, inside which the coolant flows, inside the hollow conductor used in the winding.
  • the insulating pipe prevents the coolant from coming into electrical contact with the charged conductor.
  • the pipe is pressed tightly onto the inner surface of the conductor, so that the thermal resistance caused between the conductor and the coolant is quite small and thermal transmission is scarcely weakened.
  • the conductor according to the invention is characterized by what is stated in the characterizing section of claim 1.
  • cooling method according to the invention is characterized by what is stated in the characterizing section of claim 6.
  • the invention offers significant benefits.
  • coolant can be insulated from an electrically charged conductor, when the coolant need not be as pure as in non-insulated embodiments, considerably reducing the treatment costs of the coolant. Even normal tap water can be used as the coolant.
  • the number of possible alternative coolants also increases.
  • the invention is also a suitable in solutions, in which the windings are divided into several separate parts, with differing potentials. Because the coolant is electrically insulated from the conductor in the winding, the same coolant can be used in all the parts of the winding, despite their different potentials. The charge is no longer transferred to any other parts of the cooling circuit by the coolant. Electro-chemical corrosion in the conductor and elsewhere in the cooling circuit also decreases.
  • the solution according to the invention can also simplify the cooling circuit, as there is no need to use equipment to purify the coolant and measure its electrical conductivity.
  • a conductor according to the invention is also simple and economical to manufacture.
  • the conductor according to the drawing includes a conducting part 1, along which the electrical current travels.
  • Insulating part 2 with a coolant flow channel 3 inside it, is set against the inner surface of conducting part 1.
  • Insulating part 2 may be, for example, a thin-walled pipe, and is intended to create electrical insulation between conducting part 1 and the coolant.
  • Insulating part 2 may be manufactured from, for example, plastic, such as polyethylene, or some other suitable material, which does not conduct electricity.
  • the material of conducting part 1 may be, for example, copper piping.
  • the conductor can be manufactured by, for example, pushing insulating part 2 into conducting part 1, prior to the final stage of drawing conducting part 1. In the final drawing stage, copper conducting part 1 narrows so much, that it grips insulating part 2 tightly.
  • the boundary surface between conducting part 1 and insulating part 2 is unbroken, so that the boundary surface's thermal resistance, that hampers heat transfer, is small.
  • Increasing the pressure of the coolant flowing in flow channel 3 of insulating part 2 will press insulating part 2 more tightly against conducting part 1, further reducing the thermal resistance of the boundary surface between them.
  • Insulating part 2 is extended so far beyond the ends of conducting part 1, that the rest of the cooling circuit can be connected to insulating part 2, without touching conducting part 1. If necessary, the sections of insulating part 2 protruding from conducting part 1 can be reinforced to increase their resistance to pressure.
  • the conductor according to the invention is used primarily in low-voltage applications, with a maximum voltage of 1000 V.
  • a sufficient thickness for insulating part 2 is about 0.5 mm. Insulating part 2 can also be thicker, whereupon the temperature gradient over it will be correspondingly greater.
  • conducting part 1 is manufactured from copper piping with an outer diameter of 10 mm and a wall thickness of 1 mm, giving it a cross-sectional area of about 28 mm 2 .
  • Insulating part 2 is manufactured from plastic piping, with a wall thickness of 0.5 mm and a specific thermal conductivity of 0.25 W/m*K.
  • the current flowing through conducting part 1 is 500 A rms , so that the total heat loss in conducting part 1 is about 155 W/m. Thus, the heat flux through insulating part 2 will be 7 kW/m 2 . If the total length of the conducting part is 6.8 m, the total heat loss will be 1054 W. If the cooling water heats up by 10°C as it flows through the conductor, a cooling water flow of 0.025 dm 3 /s will be needed for the waste heat created to be transferred away from the conductor. The flow velocity of the water in flow channel 3 of insulating part 2 is about 0.65 m/s, so that there is little risk of erosive cavitation arising in insulating part 2.
  • a conductor according to the invention can also be used in embodiments other than the windings of transformers and inductors.
  • Conducting part 1 can also be manufactured from electrically conductive materials other than copper, for example, from aluminium. Points of discontinuity, such as folds or grooves, which increase the turbulence in the coolant, can also be made in the surface of coolant flow channel 3 of insulating part 2.
  • coolant flow channels 3 can also be placed in insulating part 2.
  • the cross-section of flow channel 3 can, if necessary, be given a shape other than a circle, such as an oval or a polygon.

Landscapes

  • Insulated Conductors (AREA)
  • Installation Of Bus-Bars (AREA)
  • Windings For Motors And Generators (AREA)
  • Transformer Cooling (AREA)
EP00660014A 1999-02-03 2000-01-27 Conducteur refroidi par liquide Withdrawn EP1026703A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI990209A FI990209A (fi) 1999-02-03 1999-02-03 Nestejäähdytetty johdin
FI990209 1999-02-03

Publications (2)

Publication Number Publication Date
EP1026703A2 true EP1026703A2 (fr) 2000-08-09
EP1026703A3 EP1026703A3 (fr) 2001-02-21

Family

ID=8553605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00660014A Withdrawn EP1026703A3 (fr) 1999-02-03 2000-01-27 Conducteur refroidi par liquide

Country Status (2)

Country Link
EP (1) EP1026703A3 (fr)
FI (1) FI990209A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7592546B2 (en) 2002-11-05 2009-09-22 Volvo Lastvagnar Ab Cable duct for a vehicle
WO2021001093A1 (fr) * 2019-07-01 2021-01-07 Phoenix Contact E-Mobility Gmbh Élément connecteur de charge refroidi de manière active
WO2023111355A1 (fr) * 2021-12-17 2023-06-22 Hydro Extruded Solutions As Câble haute tension et procédé de fabrication du câble

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903355A (en) * 1973-05-29 1975-09-02 Felten & Guilleaume Kabelwerk Cooling arrangement for electrical transmission system
US5591937A (en) * 1994-12-02 1997-01-07 Hughes Aircraft Company High power, high frequency transmission cable breach detection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903355A (en) * 1973-05-29 1975-09-02 Felten & Guilleaume Kabelwerk Cooling arrangement for electrical transmission system
US5591937A (en) * 1994-12-02 1997-01-07 Hughes Aircraft Company High power, high frequency transmission cable breach detection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7592546B2 (en) 2002-11-05 2009-09-22 Volvo Lastvagnar Ab Cable duct for a vehicle
WO2021001093A1 (fr) * 2019-07-01 2021-01-07 Phoenix Contact E-Mobility Gmbh Élément connecteur de charge refroidi de manière active
WO2023111355A1 (fr) * 2021-12-17 2023-06-22 Hydro Extruded Solutions As Câble haute tension et procédé de fabrication du câble

Also Published As

Publication number Publication date
FI990209A0 (fi) 1999-02-03
FI990209A (fi) 2000-08-04
EP1026703A3 (fr) 2001-02-21

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