EP 0172494 A1 19860226 - Method for manufacturing epoxy resin-embedded windings for transformers.
Title (en)
Method for manufacturing epoxy resin-embedded windings for transformers.
Title (de)
Verfahren zur Herstellung in Giessharz eingebetteter Wicklungen für Transformatoren.
Title (fr)
Procédé pour la fabrication d'enroulements noyés dans de la résine moulable pour transformateurs.
Publication
Application
Priority
DE 3430586 A 19840820
Abstract (en)
1. Method for manufacturing coils, embedded in cast resin, for transformers, - according to which, spools (1), lying one behind another in the axial direction, of the coil are wound each for itself and independently of one another, - according to which, one insulating material mat respectively, serves, in a radial direction, as a brace (2, 3) between an inner casing (5) of the casting mould and the spools (1), as well as between the spools (1) and an outer casing (6) of the casting mould, - according to which, the spools (1) are fixed in an axial direction by frictional contact on the inner brace (2), - according to which, the inner (5) and the outer casing (6) of the casting mould are fixed between mould en walls (10), - according to which, casting with a horizontal mould in an evacuated chamber, follows through a slit (8), parallel to the axis, in the outer casing (6) of the casting mould, and - according to which, the hardening of the cast resin mass follows, at least partly, in the mould with increased temperature and with atmospheric or higher pressure, characterised in that, - the insulating material mats comprise fabric of non-twisted loose glass fibre bundles (15, 16), crossed and impregnated with hardenable artificial resin, - individual threads (17), twisted in themselves, of shrinkable artificial resin are worked into this fabric along zig-zag lines lying substantially in the fabric plane, - the twisted threads (17) in the insulating material mat shrink, during the hardening of the artificial resin mass, introduced through the impregnating, before the insulating materiel mat is brought into the casting mould, and telescope the glass fibre bundles (15, 16) at their intersections, lying in the points of the zig-zag line, to form knotlike swellings, and in that, - these swellings clamp the spools (1) in the casting mould.
Abstract (de)
Zur Herstellung des Gießharzumgusses für derartige Transformatorwicklungen dienen üblicherweise Isolierstoffmatten als Abstandshalter (2, 3) in radialer Richtung zwischen einem inneren Mantel (5) der Gießform und den Spulen (1) sowie zwischen den Spulen (1) und einem äußeren Mantel (6) der Gießform, indem diese Abstandshalter (2, 3) die Spulen (1) durch Kraftschluß fixieren. Erfindungsgemäß bestehen die Isolierstoffmatten aus Gewebe aus unverdrillten, lockeren, mit aushärtbarem Kunstharz getränkten Glasfaserbündeln (15, 16) und sind einzelne, in sich verdrillte Fäden (17) aus schrumpffähigem Kunstharz entlang von im wesentlichen in der Gewebeebene liegenden Zick-Zack-Linien in dieses Gewebe eingearbeitet, so daß die verdrillten Fäden (17) in der Isolierstoffmatte schrumpfen und die Glasfaserbündel zu knotenähnlichen Verdickungen zusammenschieben, die die Spulen (1) in der Gießform einklemmen. Die Verwendung der erfindungsgemäß gestalteten isolierstoffmatten ermöglicht eine besonders wirtschaftliche Herstellung von in Gießharz eingebetteten Transformatorwicklungen für Leistungstransformatoren mit Nennspannungen von 10 kV und mehr sowie bis zu Nennleistungen von mehr als 10 MVA.
IPC 1-7
IPC 8 full level
H01F 41/12 (2006.01)
CPC (source: EP KR)
H01F 41/12 (2013.01 - KR); H01F 41/127 (2013.01 - EP)
Citation (search report)
- EP 0103237 A2 19840321 - TRANSFORMATOREN UNION AG [DE]
- EP 0107802 A2 19840509 - SMIT TRANSFORMATOREN BV [NL]
- EP 0031576 A1 19810708 - FUJI ELECTRIC CO LTD [JP]
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0172494 A1 19860226; EP 0172494 B1 19880713; AT E35746 T1 19880715; BR 8503952 A 19860603; DE 3430586 A1 19860227; DE 3563802 D1 19880818; KR 860002121 A 19860326; KR 920010357 B1 19921127
DOCDB simple family (application)
EP 85109937 A 19850807; AT 85109937 T 19850807; BR 8503952 A 19850819; DE 3430586 A 19840820; DE 3563802 T 19850807; KR 850005978 A 19850820