EP0397373A3 - Improvements in safety insulated transformers - Google Patents

Improvements in safety insulated transformers Download PDF

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Publication number
EP0397373A3
EP0397373A3 EP19900304740 EP90304740A EP0397373A3 EP 0397373 A3 EP0397373 A3 EP 0397373A3 EP 19900304740 EP19900304740 EP 19900304740 EP 90304740 A EP90304740 A EP 90304740A EP 0397373 A3 EP0397373 A3 EP 0397373A3
Authority
EP
European Patent Office
Prior art keywords
safety
layers
insulation
coil
insulating material
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Withdrawn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
EP19900304740
Other languages
German (de)
French (fr)
Other versions
EP0397373A2 (en
Inventor
Joseph Ho
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.)
Astec International Ltd
Original Assignee
Astec International Ltd
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 Astec International Ltd filed Critical Astec International Ltd
Publication of EP0397373A2 publication Critical patent/EP0397373A2/en
Publication of EP0397373A3 publication Critical patent/EP0397373A3/en
Withdrawn legal-status Critical Current

Links

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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Transformer Cooling (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

A safety insulated transformer where there are at least three layers of safety approved insulating material between any parts of the wires forming first and second windings. The first winding is wrapped torroidally with a strip of safety approved insulating material, the successive layers of that wrapping overlapping to form at least two of the required layers of safety approved insulating material, and either overlapping to form all three required layers or at least one of the wires having a coating of safety approved insulation. Preferably the ends of the wire of the first winding have end insulation comprising coiled overlapped layers of safety insulation, and a layer of additional safety insulation material of at least two superimposed thicknesses makes a minimum of one and one half turns transversely of the coil of the first winding around the coil in the region or regions where the ends leave the coil.
EP19900304740 1989-05-11 1990-05-01 Improvements in safety insulated transformers Withdrawn EP0397373A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898910825A GB8910825D0 (en) 1989-05-11 1989-05-11 Improvements in safety insulated transformers
GB8910825 1989-05-11

Publications (2)

Publication Number Publication Date
EP0397373A2 EP0397373A2 (en) 1990-11-14
EP0397373A3 true EP0397373A3 (en) 1991-12-18

Family

ID=10656569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900304740 Withdrawn EP0397373A3 (en) 1989-05-11 1990-05-01 Improvements in safety insulated transformers

Country Status (2)

Country Link
EP (1) EP0397373A3 (en)
GB (1) GB8910825D0 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9226925D0 (en) * 1992-12-24 1993-02-17 Anglia Electronic Tech Ltd Transformer winding

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039549A1 (en) * 1980-10-20 1982-05-19 Siemens AG, 1000 Berlin und 8000 München Small size electrical transformer - has spiral insulator between primary and secondary coils to simplify manufacture
DE3107059A1 (en) * 1981-02-25 1982-09-09 Siemens AG, 1000 Berlin und 8000 München Electrical transformer
DE8536791U1 (en) * 1985-12-18 1986-06-19 Siemens AG, 1000 Berlin und 8000 München Embossing machine for an insulating film for the layer winding of a transformer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55118614A (en) * 1979-03-06 1980-09-11 Toshiba Corp Multiplex winding coil
JPS57188817A (en) * 1981-05-15 1982-11-19 Mitsubishi Electric Corp Insulating taping method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039549A1 (en) * 1980-10-20 1982-05-19 Siemens AG, 1000 Berlin und 8000 München Small size electrical transformer - has spiral insulator between primary and secondary coils to simplify manufacture
DE3107059A1 (en) * 1981-02-25 1982-09-09 Siemens AG, 1000 Berlin und 8000 München Electrical transformer
DE8536791U1 (en) * 1985-12-18 1986-06-19 Siemens AG, 1000 Berlin und 8000 München Embossing machine for an insulating film for the layer winding of a transformer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 170 (E-35)(652) 22 November 1980 & JP-A-55 118 614 ( TOKYO SHIBAURA ) 11 September 1980 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 36 (E-158)(1181) 15 February 1983 & JP-A-57 188 817 ( MITSUBISHI ) 19 November 1982 *

Also Published As

Publication number Publication date
EP0397373A2 (en) 1990-11-14
GB8910825D0 (en) 1989-06-28

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