EP0082360A1 - Kühlvorrichtung für elektrischen Transformator - Google Patents

Kühlvorrichtung für elektrischen Transformator Download PDF

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Publication number
EP0082360A1
EP0082360A1 EP19820111078 EP82111078A EP0082360A1 EP 0082360 A1 EP0082360 A1 EP 0082360A1 EP 19820111078 EP19820111078 EP 19820111078 EP 82111078 A EP82111078 A EP 82111078A EP 0082360 A1 EP0082360 A1 EP 0082360A1
Authority
EP
European Patent Office
Prior art keywords
cooling
air
cooling device
cooling means
tubing
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Withdrawn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
EP19820111078
Other languages
English (en)
French (fr)
Inventor
Minoru Kimura
Teruo Ina
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0082360A1 publication Critical patent/EP0082360A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/20—Cooling by special gases or non-ambient air
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling

Definitions

  • This invention relates to a cooling device for an electric transformer, and, more particularly, it is concerned with a cooling device for an electric transformer which performs cooling of such transformer by natural convection of air.
  • this type of the cooling device for the electric transformer is so constructed, as shown in Figure 1, that both ends of each of a multitude of cooling tubes 1, 1, ... juxtaposed in parallel at predetermined space intervals among them are connected with two tubes 2, 2 disposed in the direction perpendicular to these cooling tubes, one end of these tubes 2, 2 being closed and the other end thereof being connected with the main body 3 of the transformer.
  • a forced circulation device 4 for a cooling medium is further connected to the base part of one of the tubes 2, 2 to cause the cooling medium to flow through the tubes as shown by arrow marks in solid line, while air flows in natural convection outside the cooling tubes 1, 1 bib in the direction of arrow marks in dotted line.
  • the cooling device of the above-described construction since the heat transfer rate between air and the cooling tubes 1, 1, Vietnamese is very small in comparison with the heat transfer rate between the cooling medium and the cooling tubes, the dimension of the cooling device is governed by a heat transfer area for obtaining a required quantity of heat passage between air and the cooling tubes 1, 1, ; Accordingly, in the above-described conventional construction of the cooling device, a broader heat transfer area had to be secured for passage of heat between air and the cooling tubes.
  • the height of the cooling tube is increased to secure the required heat transfer area
  • acquisition of the required heat transfer area has been done mainly by increasing the number of cooling tubes with the consequent problem of a larger installation area having been required.
  • the present invention taking note of the above-described points of problem in the conventional cooling device, has been made with a view to improving such disadvantage inherent in the known device.
  • a cooling device for an electric transformer which comprises: a) a cooling means disposed in the horizontal direction and through which cooling medium passes ; b) first and second headers provided at an inlet side and an outlet side of said cooling means; c) first tubing to lead the cooling medium which has cooled the transformer to said first header ; d) second tubing to lead the cooling medium in said cooling means into said transformer through said second header; and e) a duct to lead air to the upper part of said cooling means after completion of the heat-exchange between said cooling medium in said cooling means and air.
  • Figure 2 is a plan view illustrating one embodiment of the cooling device according to the present invention
  • Figure 3 shows a front view of the same
  • Figure 4 shows a perspective view of the cooling device of Figure 2 as viewed along a line A-A' in Figure 2.
  • reference numeral 1, 1, ?? designates cooling tubes, in the interior of which an insulated gas as a cooling medium flows, while air flows between adjacent tubes in the natural convection. Both ends of these cooling tubes 1, 1, .... are connected with headers 5, 5 for coupling the gas pipes 2, 2.
  • a frusto-conical gas discharging duct 7 having an opening 6 at its top end
  • legs 8, 8 which support the entire cooling device at a position floated from the floor surface so that air may flow thereinto from the bottom part thereof as shown by arrow marks in dotted lines, climb up inside the air discharging duct 7, and be discharged from the top end of the opening 6.
  • a reference numeral 3 designates a main body of the electric transformer, and 4 refers to a forced circulation device.
  • Figure 5 shows the cooling device not equipped with the gas discharging duct 7 and a passage route of air in its natural convection
  • Figure 6 shows a temperature distribution of air in correspondence to height of the cooling device shown in Figure 5, the temperature changing in the direction of an arrow mark.
  • a portion a in Figure 6 indicates that air climbs up through the space gap between adjacent cooling tubes 1, 1, Vietnamese and its temperature changes from ⁇ 1 to ⁇ 2 .
  • Portions b and c in the same drawing indicate a route, through which the heated air is diffused from the opening portion, cooled again to the temperature O 1 , and reaches an inlet at the lower part of the cooling device.
  • a pressure to cause the air to flow into the space gap between the adjacent cooling tubes at the inlet part for the air at the lower part of the cooling device is developed by a difference in the density of air between the upper exit part of the device and the lower inlet part thereof, and is represented by the following equation.
  • H R represents a height of the cooling tube 1 as shown in Figure 5.
  • Figure 7 illustrates the cooling device provided with the gas discharging duct 7, and a passage route for air in its natural convection.
  • Figure 8 shows a temperature distribution of air in correspondence to the height of the cooling device shown in Figure 7.
  • a portion a indicates that the air rises through the space gap between the adjacent cooling tubes 1, 1, ...., and the temperature changes from ⁇ 1 to ⁇ 2 .
  • a portion d indicates that the air at the temperature On rises upwards in the gas discharging duct 7.
  • the portions b and c illustrate the passage route, through which heated air is diffused from the opening portion 6 and cooled again to the temperature ⁇ 1 to reach the inlet port at the lower part of the cooling device.
  • a pressure to cause the air to flow into the inlet port at the lower part of the device is developed by a difference in the density of air between the upper part of the gas discharging duct 7 and the lower inlet part of the cooling device, and is represented by the following equation.
  • H T represents a height of the gas discharging duct 7 as shown in Figure 7.
  • the other symbols are the same as in the equation (1).
  • the present invention is able to improve the heat transfer rate between air and the cooling tubes by the provision of the gas discharging duct at the air exit port atop the arrangement of the cooling tubes, so that the area for installation of the cooling device can be effectively decreased for the improved heat transfer rate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
EP19820111078 1981-12-09 1982-12-01 Kühlvorrichtung für elektrischen Transformator Withdrawn EP0082360A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP199665/81 1981-12-09
JP19966581A JPS58100408A (ja) 1981-12-09 1981-12-09 変圧器の冷却装置

Publications (1)

Publication Number Publication Date
EP0082360A1 true EP0082360A1 (de) 1983-06-29

Family

ID=16411586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820111078 Withdrawn EP0082360A1 (de) 1981-12-09 1982-12-01 Kühlvorrichtung für elektrischen Transformator

Country Status (2)

Country Link
EP (1) EP0082360A1 (de)
JP (1) JPS58100408A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500390A1 (de) * 1991-02-22 1992-08-26 Kabushiki Kaisha Toshiba Gasisoliertes, elektrisches Gerät
EP0551554A1 (de) * 1992-01-17 1993-07-21 Mitsubishi Denki Kabushiki Kaisha Kühleinrichtung für den Bordtransformator einer elektrischen Lokomotive
CN112614655A (zh) * 2020-12-03 2021-04-06 安徽晶飞科技有限公司 一种变压器用降温装置及其工作方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT101584B (de) * 1924-10-13 1925-11-10 Nordon Freres Fa Umlaufkühlvorrichtung für elekrische Maschinen, insbesondere für Behälter von Öltransformatoren.
US1711364A (en) * 1925-09-22 1929-04-30 Roothaan Jan Oil-cooled transformer
CH150095A (de) * 1929-09-25 1931-10-15 Siemens Ag Luftgekühlter Fahrzeugtransformator.
GB391556A (en) * 1932-01-27 1933-05-04 Serck Radiators Ltd Improvements in tubular apparatus for exchanging heat between fluids, applicable to electrical transformer tanks
CH607261A5 (de) * 1975-05-12 1978-11-30 Gec South Africa Pty

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT101584B (de) * 1924-10-13 1925-11-10 Nordon Freres Fa Umlaufkühlvorrichtung für elekrische Maschinen, insbesondere für Behälter von Öltransformatoren.
US1711364A (en) * 1925-09-22 1929-04-30 Roothaan Jan Oil-cooled transformer
CH150095A (de) * 1929-09-25 1931-10-15 Siemens Ag Luftgekühlter Fahrzeugtransformator.
GB391556A (en) * 1932-01-27 1933-05-04 Serck Radiators Ltd Improvements in tubular apparatus for exchanging heat between fluids, applicable to electrical transformer tanks
CH607261A5 (de) * 1975-05-12 1978-11-30 Gec South Africa Pty

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500390A1 (de) * 1991-02-22 1992-08-26 Kabushiki Kaisha Toshiba Gasisoliertes, elektrisches Gerät
US5252778A (en) * 1991-02-22 1993-10-12 Kabushiki Kaisha Toshiba Gas-insulated electric apparatus
EP0551554A1 (de) * 1992-01-17 1993-07-21 Mitsubishi Denki Kabushiki Kaisha Kühleinrichtung für den Bordtransformator einer elektrischen Lokomotive
CN112614655A (zh) * 2020-12-03 2021-04-06 安徽晶飞科技有限公司 一种变压器用降温装置及其工作方法

Also Published As

Publication number Publication date
JPS58100408A (ja) 1983-06-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE LI SE

17P Request for examination filed

Effective date: 19830707

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19850910

RIN1 Information on inventor provided before grant (corrected)

Inventor name: INA, TERUO

Inventor name: KIMURA, MINORU