{"id":2129,"date":"2026-07-29T09:00:00","date_gmt":"2026-07-29T01:00:00","guid":{"rendered":"https:\/\/lbajiele.com\/?p=2129"},"modified":"2026-07-21T11:38:51","modified_gmt":"2026-07-21T03:38:51","slug":"factory-acceptance-testing-power-transformers-importer-witness-checklist","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/vi\/blog\/factory-acceptance-testing-power-transformers-importer-witness-checklist\/","title":{"rendered":"Ki\u1ec3m tra nghi\u1ec7m thu t\u1ea1i nh\u00e0 m\u00e1y \u0111\u1ed1i v\u1edbi m\u00e1y bi\u1ebfn \u00e1p l\u1ef1c: Danh m\u1ee5c ki\u1ec3m ch\u1ee9ng d\u00e0nh cho nh\u00e0 nh\u1eadp kh\u1ea9u"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Transformer factory acceptance testing<\/strong> is the last moment problems are the factory&#8217;s to fix at the factory&#8217;s cost\u2014after shipment, every issue becomes a negotiation.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Importers who witness FAT with a structured checklist consistently receive better-documented units. This guide covers the tests to witness, the logistics, and the release criteria.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Write witness rights into the purchase contract; they are difficult to add later.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Factory acceptance testing overview for power transformer importers\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/04\/Transformer_case2.webp\" \/><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\">M\u1ee5c l\u1ee5c<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"#part-1-what-fat-covers-and-why-witnessing-matters\">Part 1. What FAT covers and why witnessing matters<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-routine-tests-to-witness\">Part 2. Routine tests to witness<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-type-and-special-tests\">Part 3. Type and special tests<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-witness-logistics\">Part 4. Witness logistics<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-documentation-and-release\">Part 5. Documentation and release<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-product-recommendation-and-fit-boundary\">Ph\u1ea7n 6. \u0110\u1ec1 xu\u1ea5t s\u1ea3n ph\u1ea9m v\u00e0 Ranh gi\u1edbi ph\u00f9 h\u1ee3p<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-7-common-fat-mistakes\">Part 7. Common FAT mistakes<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#faq\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#references\">T\u00e0i li\u1ec7u tham kh\u1ea3o<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-what-fat-covers-and-why-witnessing-matters\">Part 1. What FAT covers and why witnessing matters<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Factory acceptance testing bundles the routine tests performed on every unit with any contracted type or special tests, executed before shipment release.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Witnessing\u2014on site or remote\u2014verifies the tests happen on your unit, with calibrated equipment, against the agreed acceptance criteria.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">\u0110\u1ec3 c\u00f3 ng\u1eef c\u1ea3nh li\u00ean quan, h\u00e3y xem <a href=\"https:\/\/lbajiele.com\/vi\/blog\/2000kva-oil-immersed-power-specifications-rfq-guide\/\">Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt m\u00e1y bi\u1ebfn \u00e1p ng\u00e2m d\u1ea7u 2000KVA v\u00e0 h\u01b0\u1edbng d\u1eabn y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ)<\/a>.<br \/>\n\u0110\u1ec3 c\u00f3 ng\u1eef c\u1ea3nh li\u00ean quan, h\u00e3y xem <a href=\"https:\/\/lbajiele.com\/vi\/blog\/800kva-oil-immersed-specifications-rfq-checklist\/\">Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt m\u00e1y bi\u1ebfn \u00e1p ng\u00e2m d\u1ea7u 800KVA v\u00e0 danh\u0647\u0645 ki\u1ec3m tra y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ)<\/a>.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-routine-tests-to-witness\">Part 2. Routine tests to witness<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Six routine tests carry most of the acceptance weight.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Routine test witnessing for power transformers at the factory\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/04\/Transformer_case1.webp\" \/><\/figure>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Ki\u1ec3m tra<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">What it proves<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0110i\u1ec7n tr\u1edf cu\u1ed9n d\u00e2y<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Joint quality and conductor integrity<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Ratio and vector group check<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Nameplate ratings and connection correctness<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">No-load loss and current<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Core quality at rated excitation<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Load loss and impedance<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Guaranteed losses and short-circuit impedance at reference temperature<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Applied and induced voltage tests<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Insulation withstand between and within windings<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0110i\u1ec7n tr\u1edf c\u00e1ch \u0111i\u1ec7n<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Dryness and assembly quality<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">IEC 60076-1 and IEEE C57.12.90 define the methods and tolerances; name the edition in the contract so acceptance criteria stay unambiguous.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-type-and-special-tests\">Part 3. Type and special tests<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Type tests\u2014temperature rise, lightning impulse, short-circuit withstand\u2014prove the design family rather than each unit.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Accept existing type test reports on identical designs where schedule matters; require witnessed repeats only when the design is new or the project demands it.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Special tests such as sound level measurement belong in the contract explicitly, with acceptance values.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-witness-logistics\">Part 4. Witness logistics<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Agree notice periods, hold points, and re-test rules before production starts\u2014chasing them during testing wastes leverage.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Remote witnessing works when the factory provides live instrument views and signed raw data; state the format in the contract.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">One competent witness carrying the test plan beats a delegation without it.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-documentation-and-release\">Part 5. Documentation and release<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Release shipment against a document set: signed test reports with raw data, nameplate photo, calibration references, and closure of any non-conformities.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Check report values against guaranteed figures\u2014losses and short-circuit impedance carry commercial tolerances that affect price adjustments.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Document acceptance comes first; shipment release follows it, never the reverse.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-product-recommendation-and-fit-boundary\">Ph\u1ea7n 6. \u0110\u1ec1 xu\u1ea5t s\u1ea3n ph\u1ea9m v\u00e0 Ranh gi\u1edbi ph\u00f9 h\u1ee3p<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>G\u1ee3i \u00fd s\u1ea3n ph\u1ea9m:<\/strong> Test scope and acceptance criteria are series-level topics\u2014settle them during selection. Start at the <a href=\"https:\/\/lbajiele.com\/vi\/transformer\/\">danh m\u1ee5c s\u1ea3n ph\u1ea9m m\u00e1y bi\u1ebfn \u00e1p<\/a>, sau \u0111\u00f3 xem l\u1ea1i <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/s-m-oil-immersed-power-transformer\/\">D\u00f2ng m\u00e1y bi\u1ebfn \u00e1p ng\u00e2m d\u1ea7u S\u25a1-M<\/a> v\u00e0 <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/scb-resin-insulation-dry-transformer-series\/\">D\u00f2ng m\u00e1y bi\u1ebfn \u00e1p kh\u00f4 c\u00e1ch \u0111i\u1ec7n nh\u1ef1a SC(B)<\/a> tr\u00e1i v\u1edbi th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Transformer series for factory acceptance test planning\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/04\/S20-M-OIL-IMMERSED-POWER-TRANSFORMER-2.webp\" \/><\/figure>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Ph\u00f9 h\u1ee3p h\u01a1n<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Kh\u00f4ng ph\u00f9 h\u1ee3p n\u1ebfu kh\u00f4ng nghi\u00ean c\u1ee9u th\u00eam<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Contracts naming tests, standards, and editions<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Assuming FAT is included without written scope<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Importers with witness rights in the purchase order<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Requesting witnessing after production ends<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Teams checking reports against guaranteed figures<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Filing unread test reports at handover<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">G\u1eedi c\u00f4ng su\u1ea5t \u0111\u1ecbnh m\u1ee9c kVA v\u00e0 t\u1ed5 h\u1ee3p \u0111i\u1ec7n \u00e1p, nh\u00f3m \u0111\u1ea5u d\u00e2y v\u00e0 d\u1ea3i \u0111i\u1ec1u \u00e1p, t\u1ed5n th\u1ea5t kh\u00f4ng t\u1ea3i v\u00e0 t\u1ed5n th\u1ea5t c\u00f3 t\u1ea3i, ph\u01b0\u01a1ng ph\u00e1p l\u00e0m m\u00e1t v\u00e0 v\u1ecf b\u1ea3o v\u1ec7, c\u00f9ng v\u1edbi \u0111i\u1ec7n \u00e1p ng\u1eafn m\u1ea1ch m\u1ee5c ti\u00eau th\u00f4ng qua <a href=\"https:\/\/lbajiele.com\/vi\/contact-us\/\">Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i<\/a> \u0111\u1ec3 x\u00e1c nh\u1eadn d\u00e0nh ri\u00eang cho m\u00f4 h\u00ecnh.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-7-common-fat-mistakes\">Part 7. Common FAT mistakes<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">Signing contracts without witness rights or notice periods.<\/li>\n<li style=\"margin:0 0 8px\">Accepting summary sheets without raw measurement data.<\/li>\n<li style=\"margin:0 0 8px\">Ignoring the reference temperature when checking loss guarantees.<\/li>\n<li style=\"margin:0 0 8px\">Treating type test reports from a different design as equivalent evidence.<\/li>\n<li style=\"margin:0 0 8px\">Skipping calibration record checks on the test equipment.<\/li>\n<li style=\"margin:0 0 8px\">Releasing shipment before non-conformities are closed in writing.<\/li>\n<\/ul>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"faq\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3 style=\"margin:28px 0 12px\">What is factory acceptance testing for transformers?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">The routine, type, and special tests executed at the factory before shipment release, checked against contracted acceptance criteria.<\/p>\n<h3 style=\"margin:28px 0 12px\">Which routine tests should importers witness?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Ratio and vector group, winding resistance, no-load and load loss with impedance, applied and induced voltage, and insulation resistance.<\/p>\n<h3 style=\"margin:28px 0 12px\">What is the difference between routine and type tests?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Routine tests run on every unit; type tests prove the design family once\u2014temperature rise, impulse, and short-circuit withstand.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can factory acceptance testing be witnessed remotely?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Yes\u2014with live instrument views, signed raw data, and a contract clause defining the remote format and hold points.<\/p>\n<h3 style=\"margin:28px 0 12px\">What documents follow a passed FAT?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Signed test reports with raw data, calibration references, nameplate records, and written closure of any non-conformities.<\/p>\n<h3 style=\"margin:28px 0 12px\">What happens if a test result misses its limit during FAT?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">The factory investigates, corrects, and re-tests under the agreed re-test rules; shipment release waits for closure.<\/p>\n<h3 style=\"margin:28px 0 12px\">How much notice should the factory give before FAT?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Contracts commonly set one to two weeks of notice; fix the period explicitly so travel and remote setup stay plannable.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"references\">T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/588\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1: M\u00e1y bi\u1ebfn l\u1ef1c \u2014 Y\u00eau c\u1ea7u chung<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/ieee\/C57.12.90\/5133\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.90: Quy tr\u00ecnh th\u1eed nghi\u1ec7m m\u00e1y bi\u1ebfn \u00e1p ng\u00e2m ch\u1ea5t l\u1ecfng<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/ieee\/C57.12.00\/6788\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00: Y\u00eau c\u1ea7u chung \u0111\u1ed1i v\u1edbi m\u00e1y bi\u1ebfn \u00e1p ng\u00e2m ch\u1ea5t l\u1ecfng<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Transformer factory acceptance testing is the last moment problems are the factory&#8217;s to fix at the factory&#8217;s cost\u2014after shipment, every issue becomes a negotiation. Importers who witness FAT with a structured checklist consistently receive better-documented units. This guide covers the tests to witness, the logistics, and the release criteria. Write witness rights into the purchase [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1552,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31],"tags":[],"class_list":["post-2129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/comments?post=2129"}],"version-history":[{"count":1,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2129\/revisions"}],"predecessor-version":[{"id":2142,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2129\/revisions\/2142"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media\/1552"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media?parent=2129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/categories?post=2129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/tags?post=2129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}