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    • 40. 发明授权
    • Method for impregnating and embedding electrical windings
    • 浸渍和嵌入电绕组的方法
    • US4576768A
    • 1986-03-18
    • US624983
    • 1984-06-27
    • Helmut MarkertWolfgang RoglerWolfgang BendelFriedrich Alber
    • Helmut MarkertWolfgang RoglerWolfgang BendelFriedrich Alber
    • H01F41/12H02K15/12B29C35/02
    • H01F41/127
    • The invention relates to a method for impregnating and embedding electrical windings, especially coils of transformers, by means of an impregnating or casting resin based upon polyepoxide-polyisocyanate mixtures in the presence of a reaction accelerator latent at the processing conditions, which employs conditions that prevent the formation of gas and shrinkage voids in the cast in winding. To this end, the resin including, if applicable, additives, is dried at reduced pressure and while stirring at temperatures of up to 110.degree. C. and the winding is cast-in with the dried resin at reduced pressure and at temperature of up to 110.degree. C.; then the reduced pressure is removed and the winding is exposed to overpressure. Subsequently, generating by an elevated temperature in the electrical winding by Joule heat in the conductor, the cross-linking reaction of the resin is started and is controlled as a function of the reaction heat, until the winding is removed from the mold and post-hardened.
    • 本发明涉及一种用于在处理条件下在反应促进剂潜在的存在下,通过基于聚环氧化物 - 多异氰酸酯混合物的浸渍或浇注树脂来浸渍和嵌入电绕组,特别是变压器线圈的方法,该方法采用防止 在绕组中形成气体和收缩空隙。 为此,包括(如果适用的话)添加剂的树脂在减压下干燥并在高达110℃的温度下搅拌的同时,将干燥的树脂在减压和最高达 110℃。 然后去除减压,并将绕组暴露于过压。 随后,通过在导体中的焦耳热在电绕组中产生高温,树脂的交联反应开始并作为反应热的函数被控制,直到绕组从模具中除去, 硬化