{"id":838,"date":"2019-01-18T01:43:12","date_gmt":"2019-01-18T01:43:12","guid":{"rendered":"http:\/\/johnbrear-plantintegrity.com\/?page_id=838"},"modified":"2019-01-18T01:45:22","modified_gmt":"2019-01-18T01:45:22","slug":"mechanical-reliability-of-a-transformer","status":"publish","type":"page","link":"https:\/\/johnbrear-plantintegrity.com\/?page_id=838","title":{"rendered":"Mechanical reliability of a transformer"},"content":{"rendered":"<figure id=\"attachment_839\" aria-describedby=\"caption-attachment-839\" style=\"width: 375px\" class=\"wp-caption alignright\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/LUL-train.jpg\" alt=\"\" width=\"375\" height=\"311\" class=\"size-full wp-image-839\" srcset=\"https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/LUL-train.jpg 375w, https:\/\/johnbrear-plantintegrity.com\/wp-content\/uploads\/2019\/01\/LUL-train-300x249.jpg 300w\" sizes=\"(max-width: 375px) 100vw, 375px\" \/><figcaption id=\"caption-attachment-839\" class=\"wp-caption-text\">Underground train<\/figcaption><\/figure>\r\n<p><strong>Item:<\/strong><\/p>\r\n<ul>\r\n    <li>Wall mounting brackets for heavy (40 Kg and 60Kg) transformers located within the train tunnels of a metropolitan underground railway system<\/li>\r\n<\/ul>\r\n<p><strong>Problem:<\/strong><\/p>\r\n<ul>\r\n    <li>Failures of the bracket at installation causes concern over the long term reliability and raises safety issues<\/li>\r\n<\/ul>\r\n<p><strong>Objective: <\/strong><\/p>\r\n<ul>\r\n    <li>To establish the root cause of the initial failures<\/li>\r\n    <li>To propose redesign in the event that the root cause is found to be the design \/ installation of the bracket<\/li>\r\n<\/ul>\r\n<p><strong>Approach: <\/strong><\/p>\r\n<ul>\r\n    <li>Establish manufacturing processes and all loading conditions<\/li>\r\n    <li>Establish all orientations in which the transformers can be located<\/li>\r\n    <li>Determine the operating stresses from installation and normal operation<\/li>\r\n    <li>Metallographic examination of the weld<\/li>\r\n<\/ul>\r\n<p><br \/>\r\n<strong>Conclusions:<\/strong><\/p>\r\n<ul>\r\n    <li>Stress analysis concludes that all stresses are well below the limits imposed by good design practice<\/li>\r\n    <li>Examination of weld show that it is of poor quality and the root cause of the failure<\/li>\r\n<\/ul>\r\n<p><strong>Benefits:<\/strong><\/p>\r\n<ul>\r\n    <li>Identification of the source of the cause of the failures<\/li>\r\n    <li>Existing design acceptable, new design not required<\/li>\r\n    <li>Inadequate quality procedures for welding identified as reason for poor welds<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Item: Wall mounting brackets for heavy (40 Kg and 60Kg) transformers located within the train tunnels of a metropolitan underground railway system Problem: Failures of the bracket at installation causes concern over the long term reliability and raises safety issues Objective: To establish the root cause of the initial failures To propose redesign in the &hellip; <a href=\"https:\/\/johnbrear-plantintegrity.com\/?page_id=838\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Mechanical reliability of a transformer<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":173,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-838","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=838"}],"version-history":[{"count":2,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/838\/revisions"}],"predecessor-version":[{"id":842,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/838\/revisions\/842"}],"up":[{"embeddable":true,"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=\/wp\/v2\/pages\/173"}],"wp:attachment":[{"href":"https:\/\/johnbrear-plantintegrity.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}