{"id":2169,"date":"2026-08-07T09:00:00","date_gmt":"2026-08-07T01:00:00","guid":{"rendered":"https:\/\/lbajiele.com\/news\/transformer-efficiency-class-load-factor-procurement-guide\/"},"modified":"2026-08-08T16:27:13","modified_gmt":"2026-08-08T08:27:13","slug":"transformer-efficiency-class-load-factor-procurement-guide","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/id\/blog\/transformer-efficiency-class-load-factor-procurement-guide\/","title":{"rendered":"Panduan Pengadaan Kelas Efisiensi dan Faktor Beban Trafo"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Transformer efficiency class<\/strong> decisions look simple on a brochure and expensive when the load factor was wrong.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Buyers who compare stickers instead of declared losses and duty hours often overpay\u2014or under-spec\u2014relative to real operating cost. This guide shows how to put load factor into the RFQ, how to compare bids fairly, and which claims to reject.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Freeze the evaluation method before freezing the purchase order.<\/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 efficiency class planning overview for procurement teams\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/07\/160kva-oil-immersed-distribution-specifications-applications-body.webp\" \/><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 id=\"contents\" style=\"margin:42px 0 14px;scroll-margin-top:96px\">Contents<\/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-when-efficiency-class-becomes-a-procurement-decision\">Part 1. When efficiency class becomes a procurement decision<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-rfq-data-that-make-efficiency-bids-comparable\">Part 2. RFQ data that make efficiency bids comparable<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-load-factor-hours-and-which-loss-dominates\">Part 3. Load factor, hours, and which loss dominates<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-capitalization-rules-versus-sticker-rankings\">Part 4. Capitalization rules versus sticker rankings<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-documents-and-tests-to-request-before-award\">Part 5. Documents and tests to request before award<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-shortlist-series-after-the-evaluation-rules-are-written\">Part 6. Shortlist series after the evaluation rules are written<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-7-efficiency-procurement-mistakes-that-distort-awards\">Part 7. Efficiency-procurement mistakes that distort awards<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-when-efficiency-class-becomes-a-procurement-decision\">Part 1. When efficiency class becomes a procurement decision<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Efficiency class enters the buy when energy cost, carbon reporting, or tender rules weight losses.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Without a load factor, a higher class can look better on paper and worse in service.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">For related sizing and thermal notes, see the <a href=\"https:\/\/lbajiele.com\/id\/blog\/how-to-size-a-distribution-transformer-kva-calculation-guide\/\">distribution transformer kVA calculation guide<\/a> dan <a href=\"https:\/\/lbajiele.com\/id\/blog\/transformer-temperature-rise-class-what-to-specify-in-procurement\/\">temperature rise class guide<\/a>.<\/p>\n<blockquote>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Important:<\/strong> Rank efficiency only after the RFQ locks load factor, operating hours, and the loss-evaluation formula (<a href=\"https:\/\/standards.ieee.org\/ieee\/C57.91\/1025\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.91<\/a>).<\/p>\n<\/blockquote>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-rfq-data-that-make-efficiency-bids-comparable\">Part 2. RFQ data that make efficiency bids comparable<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Ask every supplier to quote against the same evaluation package.<\/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=\"Load-factor and loss evaluation inputs for transformer quotations\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/07\/160kva-oil-immersed-distribution-specifications-applications-cover.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\">RFQ item<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Why it matters<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Send with quote<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Rated kVA and voltage combination<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Sizing basis for losses<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">No-load and load losses<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Core of efficiency ranking<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Declared efficiency class \/ method<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Makes labels comparable<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Cooling method and enclosure<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Thermal package with losses<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Short-circuit impedance<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Protection still applies<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Vector group and tap range<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Electrical package confirmation<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Yes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">State load factor, annual hours, and the capitalization formula.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-load-factor-hours-and-which-loss-dominates\">Part 3. Load factor, hours, and which loss dominates<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">No-load loss accumulates whenever the unit is energized; load loss scales with current.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Low load factor sites often care more about no-load loss; heavily loaded feeders weight load loss harder.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Write the assumed profile so suppliers do not invent different stories.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-capitalization-rules-versus-sticker-rankings\">Part 4. Capitalization rules versus sticker rankings<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">A sticker class is not a substitute for a shared loss-evaluation spreadsheet.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">If tenders require a specific method, paste that method into the RFQ unchanged.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Reject bids that omit the loss basis or mix test and catalog figures.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-documents-and-tests-to-request-before-award\">Part 5. Documents and tests to request before award<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Request loss figures on a named basis, temperature rise class, and any efficiency declaration format required by the tender.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Confirm impedance and ratings on the same package used for protection studies.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Keep evaluation sheets in the controlled project file.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-shortlist-series-after-the-evaluation-rules-are-written\">Part 6. Shortlist series after the evaluation rules are written<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Product recommendation:<\/strong> After evaluation rules are written, open the <a href=\"https:\/\/lbajiele.com\/id\/transformer\/\">transformer product category<\/a> and screen the <a href=\"https:\/\/lbajiele.com\/id\/produk\/s-m-oil-immersed-power-transformer\/\">S\u25a1-M oil-immersed power transformer series<\/a> dan <a href=\"https:\/\/lbajiele.com\/id\/produk\/scb-resin-insulation-dry-transformer-series\/\">SC(B) resin insulated dry transformer series<\/a> against the approved duty profile.<\/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 product lines for efficiency-aware purchasing\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/07\/160kva-oil-immersed-distribution-specifications-applications-product.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\">Better fit<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Needs more study<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Load factor and hours in the RFQ<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Ranking on purchase price alone<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Shared loss-evaluation method<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Mixing catalog and test bases<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Cooling class fixed with losses<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Late class changes after award<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">Submit ratings and duty notes through <a href=\"https:\/\/lbajiele.com\/id\/contact-us\/\">Hubungi Kami<\/a> for catalog confirmation.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-7-efficiency-procurement-mistakes-that-distort-awards\">Part 7. Efficiency-procurement mistakes that distort awards<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">Ranking efficiency stickers without load factor.<\/li>\n<li style=\"margin:0 0 8px\">Omitting annual hours from the RFQ.<\/li>\n<li style=\"margin:0 0 8px\">Comparing losses on different temperature bases.<\/li>\n<li style=\"margin:0 0 8px\">Ignoring cooling class when losses change.<\/li>\n<li style=\"margin:0 0 8px\">Awarding on first cost only under energy-weighted tenders.<\/li>\n<li style=\"margin:0 0 8px\">Changing evaluation rules after bids are opened.<\/li>\n<\/ul>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"faq\">FAQ<\/h2>\n<h3 style=\"margin:28px 0 12px\">Is a higher efficiency class always better?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Only against a stated load factor and evaluation method; otherwise the premium may not match operating cost.<\/p>\n<h3 style=\"margin:28px 0 12px\">What load factor should I put in the RFQ?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Use the expected annual profile for the feeder\u2014not a generic marketing default\u2014and keep it identical across bidders.<\/p>\n<h3 style=\"margin:28px 0 12px\">Do no-load and load losses both matter?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Yes; which one dominates depends on energized hours versus loading intensity.<\/p>\n<h3 style=\"margin:28px 0 12px\">Which electrical data still belong with efficiency quotes?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Keep kVA\/voltage, vector\/tap data, declared losses, cooling\/enclosure, and impedance on one shared bid sheet.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can catalog loss figures be used for award?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Only when the RFQ allows catalog basis; otherwise require the tender\u2019s declared test or guarantee basis.<\/p>\n<h3 style=\"margin:28px 0 12px\">How do cooling methods affect efficiency comparisons?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Cooling stages change losses and thermal limits; compare bids on the same cooling definition.<\/p>\n<h3 style=\"margin:28px 0 12px\">What should buyers send suppliers?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Send load factor, hours, evaluation formula, ratings needs, and required documents with the RFQ.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"references\">References<\/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 general requirements<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/ieee\/C57.91\/1025\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.91 loading guide overview<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/ieee\/C57.12.00\/1020\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00 general requirements overview<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Transformer efficiency class decisions look simple on a brochure and expensive when the load factor was wrong. Buyers who compare stickers instead of declared losses and duty hours often overpay\u2014or under-spec\u2014relative to real operating cost. This guide shows how to put load factor into the RFQ, how to compare bids fairly, and which claims to [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2052,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31],"tags":[],"class_list":["post-2169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/posts\/2169","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/comments?post=2169"}],"version-history":[{"count":1,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/posts\/2169\/revisions"}],"predecessor-version":[{"id":2171,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/posts\/2169\/revisions\/2171"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/media\/2052"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/media?parent=2169"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/categories?post=2169"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/id\/wp-json\/wp\/v2\/tags?post=2169"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}