EP2154698B1 - Verfahren zum Herstellen eines rissfesten Gießharztransformators und rissfester Gießharztransformator - Google Patents

Verfahren zum Herstellen eines rissfesten Gießharztransformators und rissfester Gießharztransformator Download PDF

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Publication number
EP2154698B1
EP2154698B1 EP09161058.4A EP09161058A EP2154698B1 EP 2154698 B1 EP2154698 B1 EP 2154698B1 EP 09161058 A EP09161058 A EP 09161058A EP 2154698 B1 EP2154698 B1 EP 2154698B1
Authority
EP
European Patent Office
Prior art keywords
resin
cast
added
liquid
filler
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.)
Active
Application number
EP09161058.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2154698A3 (de
EP2154698A2 (de
Inventor
Christoph Scheuer
Fritz Sorg
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.)
Siemens AG
Hexion GmbH
Original Assignee
Siemens AG
Momentive Specialty Chemicals GmbH
Siemens 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 Siemens AG, Momentive Specialty Chemicals GmbH, Siemens Corp filed Critical Siemens AG
Priority to PL09161058T priority Critical patent/PL2154698T3/pl
Publication of EP2154698A2 publication Critical patent/EP2154698A2/de
Publication of EP2154698A3 publication Critical patent/EP2154698A3/de
Application granted granted Critical
Publication of EP2154698B1 publication Critical patent/EP2154698B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
    • 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
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the invention relates to a method for producing a crack-resistant cast-resin transformer, wherein a casting resin for electrical insulation of a winding body of the cast-resin transformer is used. Furthermore, the invention relates to a cast-resin transformer with an existing of cast resin electrical insulation of a winding body of the cast resin transformer.
  • casting resins in particular epoxy resins
  • electrical insulation of electrical components in particular high-voltage transformers
  • casting resins have the advantage that casting resins on the one hand have high electrical strengths and on the other hand are mechanically very stable in the cured state.
  • the problem with the use of casting resins is that the casting resin is liquid and thus difficult to process only in the heated state.
  • the DE 44 32 188 A1 an epoxy resin molding compound, which in addition to a phosphorus-modified epoxy resin further additives and inorganic fillers.
  • the epoxy resin molding composition is technically simpler and thus cheaper to produce and should have a lower water absorption and higher thermal shock resistance compared to known epoxy molding compounds.
  • a potting compound in particular for producing molded parts with embedded therein inserts, consisting of a base component and at least one additive, wherein the base component is a casting resin and the base component at least two additives, in particular quartz powder and a mineral fiber material having.
  • a problem with the casting resin transformers produced hitherto in the state of the art is that they have a high electrical output Load or, in the case of a cold shock test prescribed in accordance with standard IEC600 76 - 11, cracks, especially at the material transitions.
  • the risk of cracking is greater, the faster the curing of the casting resin during manufacture takes place. For this reason, very long curing times have hitherto been chosen in the prior art, so that a virtually uniform cooling of all components of the entire cast-resin transformer is ensured.
  • the curing process until removal of the final casting mold from the cast-resin transformer therefore takes in part more than 30 hours.
  • Object of the present invention is therefore to shorten the curing process during the production of a cast-resin transformer.
  • a toughening modifier of up to 20 phr is added to the liquid casting resin in comparison with the base component of the casting resin.
  • the term phr parts per hundred resin
  • phr parts per hundred resin
  • an accelerator is added in such a concentration that results in a gel time of less than 15 minutes at 140 ° C, wherein the enriched with these two components liquid casting resin for casting of the winding body and the thus-cast winding body for curing one linear or stepped rising temperature profile is exposed.
  • An example of this is the following temperature profile, in which within 4 hours, the composite liquid casting resin is continuously increased from a temperature of 80 ° C to 100 ° C. Subsequently, the temperature is continuously increased to 130 ° C and then finally cured for several hours at this temperature. An otherwise slow cooling in the cooling area for reducing the internal thermal stresses (annealing) is not necessary according to the present method.
  • Toughness modifiers are known for improving the temperature resistance of casting resins (for example DE 601 04 449 T2 ).
  • the use of cure accelerators for example DE 42 06 733 C2 ), the polymerization or polyaddition accelerates conversion to a crosslinked composite matrix of the thermosetting molding resin.
  • the sole or non-coordinated addition of accelerators to a liquid casting resin leads just to a rapid curing with high mechanical stresses, which forms in case of frequent temperature changes of the cast resin transformer during operation, the cracks to be avoided.
  • the crack resistance of the casting resin can be increased in such a way that mechanical stresses just do not arise during the curing process and thus at the same time the curing times can be reduced.
  • the combination of the toughness modifier with adjusted accelerator concentrations and a co-ordinated curing process reduces or eliminates the cracking of a cast resin transformer thus produced.
  • liquid casting resin as an accelerator in particular a tertiary amine and / or a quaternary ammonium compound is added.
  • the temperature profile is controlled during the curing process of the liquid casting resin by means of a temperature distribution in a furnace surrounding the winding body.
  • a filler is added to the liquid casting resin, in particular a mineral quartz powder.
  • a filler is added to the liquid casting resin, in order in addition to increase the composite matrix of the hardening casting resin by the glass short fibers to reinforce.
  • a toughening modifier of up to 20 phr is added to the casting resin of the cast-resin transformer.
  • a filler is advantageously added to the casting resin, wherein, based on the weight percent of the filler of up to 5 percent by weight glass short fibers are added to the casting resin.
  • the filler is a mineral filler, in particular an amorphous quartz powder.
  • the accelerator is in particular a tert. Amine and / or a quaternary ammonium compound and the toughness modifier, a copolymer, in particular an acrylonitrile or a silicone rubber.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulating Of Coils (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP09161058.4A 2008-05-27 2009-05-26 Verfahren zum Herstellen eines rissfesten Gießharztransformators und rissfester Gießharztransformator Active EP2154698B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09161058T PL2154698T3 (pl) 2008-05-27 2009-05-26 Sposób wytwarzania odpornego na pękanie transformatora zalewanego żywicą i odporny na pękanie transformator zalewany żywicą

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008025541A DE102008025541A1 (de) 2008-05-27 2008-05-27 Verfahren zum Herstellen eines rissfestem Gießharztransformators und rissfester Gießharztransformator

Publications (3)

Publication Number Publication Date
EP2154698A2 EP2154698A2 (de) 2010-02-17
EP2154698A3 EP2154698A3 (de) 2012-08-29
EP2154698B1 true EP2154698B1 (de) 2013-11-06

Family

ID=40942443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09161058.4A Active EP2154698B1 (de) 2008-05-27 2009-05-26 Verfahren zum Herstellen eines rissfesten Gießharztransformators und rissfester Gießharztransformator

Country Status (5)

Country Link
EP (1) EP2154698B1 (pl)
DE (1) DE102008025541A1 (pl)
ES (1) ES2442442T3 (pl)
PL (1) PL2154698T3 (pl)
PT (1) PT2154698E (pl)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1100113B (de) * 1955-08-23 1961-02-23 Westinghouse Electric Corp Isolierstoff fuer elektrotechnische Zwecke
US4665111A (en) * 1984-10-12 1987-05-12 Siemens Aktiengesellschaft Casting compound for electrical and electronic components and modules
JP2524011B2 (ja) * 1991-05-23 1996-08-14 株式会社日立製作所 高圧コイル注型用熱硬化性樹脂組成物、該組成物で注型、硬化してなるモ―ルドコイル、パネル
DE4206733C2 (de) 1992-03-04 1998-09-03 Bakelite Ag Gießharz und seine Verwendung zur Herstellung von Elektrovergußmassen
DE4343121A1 (de) 1993-12-17 1995-06-22 Abb Patent Gmbh Verfahren zur Herstellung einer Gießkeramik
DE4432188A1 (de) 1994-09-09 1996-03-14 Siemens Ag Epoxidharzformmassen zur Umhüllung von elektronischen Bauelementen
DE19648134A1 (de) * 1996-11-21 1998-05-28 Beck & Co Ag Dr Verfahren zur Tränkung von Bauteilen
US6198373B1 (en) * 1997-08-19 2001-03-06 Taiyo Yuden Co., Ltd. Wire wound electronic component
PL363757A1 (pl) 2000-11-29 2004-11-29 Vantico Ag Układ napełnionej żywicy epoksydowej o wysokich wartościach wytrzymałości mechanicznej
DE10224587A1 (de) 2002-06-04 2003-12-18 Abb Patent Gmbh Vergußmasse
DE10252435A1 (de) * 2002-11-12 2004-05-27 Abb Technology Ag Verfahren und Anordnung zur Aushärtung von Spulen
DE102004054527B4 (de) * 2004-11-05 2006-10-12 Siemens Ag Verfahren zur Herstellung einer von einer Isolierung freizuhaltenden Stelle eines isolierten Leiters und Trennmittel

Also Published As

Publication number Publication date
EP2154698A3 (de) 2012-08-29
PT2154698E (pt) 2013-11-22
ES2442442T3 (es) 2014-02-11
EP2154698A2 (de) 2010-02-17
PL2154698T3 (pl) 2014-04-30
DE102008025541A1 (de) 2009-12-17

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