{"id":1505,"date":"2022-11-27T13:49:04","date_gmt":"2022-11-27T13:49:04","guid":{"rendered":"https:\/\/www.weidmann-group.com\/news\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\/"},"modified":"2026-03-20T00:54:25","modified_gmt":"2026-03-20T00:54:25","slug":"new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard","status":"publish","type":"post","link":"https:\/\/www.weidmann-group.com\/de\/news\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\/","title":{"rendered":"New Study Confirms Belief about Thermal Class of Weidmann Transformerboard"},"content":{"rendered":"\n<p>Do you know the thermal class of Transformerboard* as part of the industry-proven insulation system used in liquid-filled transformers? Maybe you need to think again. For decades, some have considered transformer pressboard to be rated simply to 105 \u00b0C. Some in the industry have even alluded to the necessity of \u2018chemical treatments\u2019 to slow down thermal aging at elevated temperatures, in order to apply it at a higher thermal class.<\/p>\n\n\n\n<p>In a recent study, <a href=\"http:\/\/weidmann-group.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Weidmann<\/a> investigated the thermal aging performance of <a href=\"https:\/\/weidmann-electrical.com\/insulation-technology\/transformerboard\/\" target=\"_blank\" rel=\"noreferrer noopener\">Transformerboard<\/a>, as well as the sealed tube aging test procedure itself. In the 2011 edition of the <a href=\"https:\/\/standards.ieee.org\/ieee\/C57.100\/4903\/\" target=\"_blank\" rel=\"noreferrer noopener\">IEEE C57.100<\/a> standard, a new sealed tube accelerated aging test procedure was introduced to determine the thermal class of solid and liquid insulation systems. The experimental work presented in the article investigated the effects of different test parameters on aging test results and data interpretation. The new findings on the dependence of the aging process on the ratio and type of materials in the system, as well as on the selected aging criteria, provide a better understanding of accelerated aging testing and the interpretation of aging data, along with practical recommendations for improvements to the test procedure.<br><br><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"387\" src=\"https:\/\/weidmann-electrical.com\/wp-content\/uploads\/Board-Aging-Experiment-500x387.png\" alt=\"Board Aging Experiment\"><br><br>In parallel, for the first time, the thermal index (and corresponding thermal class) of Weidmann Transformerboard, as a component of the so-called industry-proven insulation system, together with thermally upgraded kraft paper and mineral oil, was investigated and defined based on the standard industry test. The results confirmed that\u00a0<strong>Transformerboard has a higher thermal class<\/strong>, which challenges the decades-old assumption relating to the thermal class of Transformerboard as used in both\u00a0<a href=\"https:\/\/weidmann-electrical.com\/power-transformers\/\" target=\"_blank\" rel=\"noreferrer noopener\">power<\/a>\u00a0and\u00a0<a href=\"https:\/\/weidmann-electrical.com\/distribution-transformers\/\" target=\"_blank\" rel=\"noreferrer noopener\">distribution transformers<\/a>.<br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Do you know the thermal class of Transformerboard* as part of the industry-proven insulation system used in liquid-filled transformers? Maybe you need to think again. For decades, some have considered transformer pressboard to be rated simply to 105 \u00b0C. Some in the industry have even alluded to the necessity of \u2018chemical treatments\u2019 to slow down [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":1009,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[34,41],"tags":[],"class_list":["post-1505","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-insight-de","category-transformerboard-de"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>New Study Confirms Belief about Thermal Class of Weidmann Transformerboard - Weidmann Group<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.weidmann-group.com\/de\/news\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New Study Confirms Belief about Thermal Class of Weidmann Transformerboard - Weidmann Group\" \/>\n<meta property=\"og:description\" content=\"Do you know the thermal class of Transformerboard* as part of the industry-proven insulation system used in liquid-filled transformers? Maybe you need to think again. For decades, some have considered transformer pressboard to be rated simply to 105 \u00b0C. Some in the industry have even alluded to the necessity of \u2018chemical treatments\u2019 to slow down [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.weidmann-group.com\/de\/news\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\/\" \/>\n<meta property=\"og:site_name\" content=\"Weidmann Group\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-27T13:49:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-20T00:54:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.weidmann-group.com\/wp-content\/uploads\/2025\/04\/Transformerboard-close-up.avif\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"1365\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"greghustler\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"greghustler\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/news\\\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/news\\\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\\\/\"},\"author\":{\"name\":\"greghustler\",\"@id\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/#\\\/schema\\\/person\\\/14c90b49f417ab0f70e7abc391243696\"},\"headline\":\"New Study Confirms Belief about Thermal Class of Weidmann Transformerboard\",\"datePublished\":\"2022-11-27T13:49:04+00:00\",\"dateModified\":\"2026-03-20T00:54:25+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/news\\\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\\\/\"},\"wordCount\":277,\"image\":{\"@id\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/news\\\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.weidmann-group.com\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/Transformerboard-close-up.avif\",\"articleSection\":[\"Industry insight\",\"Transformerboard\"],\"inLanguage\":\"de-DE\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/news\\\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\\\/\",\"url\":\"https:\\\/\\\/www.weidmann-group.com\\\/de\\\/news\\\/new-study-confirms-belief-about-thermal-class-of-weidmann-transformerboard\\\/\",\"name\":\"New Study Confirms Belief about Thermal Class of Weidmann Transformerboard - 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