{"id":38577,"date":"2026-09-01T06:05:50","date_gmt":"2026-09-01T06:05:50","guid":{"rendered":"https:\/\/dinghongtransformer.com\/?p=38577"},"modified":"2026-09-01T06:48:08","modified_gmt":"2026-09-01T06:48:08","slug":"transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote","status":"publish","type":"post","link":"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/","title":{"rendered":"Transformer RFQ Checklist: Specifications Buyers Must Provide for an Accurate Quote"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-b3bbfbab\"><strong>\u201cPlease quote a 1,000 kVA transformer.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-43272dcb\">It looks like a clear inquiry, but for a transformer manufacturer, this information is far from enough to prepare an accurate technical and commercial quotation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c6981c0a\">Two transformers with the same 1,000 kVA rating can have very different voltage ratios, vector groups, impedance, winding materials, losses, cooling methods, accessories, insulation requirements and installation conditions. These differences directly affect transformer design, manufacturing cost, dimensions and delivery.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-77712495\">For EPC contractors, utilities, industrial buyers and distributors, a complete <strong>transformer RFQ (Request for Quotation)<\/strong> can reduce repeated technical clarification and make quotations from different transformer suppliers easier to compare.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2221fe2a\">The basic principle is simple:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e4559881\"><strong>Complete Specifications \u2192 Accurate Engineering \u2192 Comparable Quotation \u2192 Fewer Revisions<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a78a4a5d\">So, what information should you send when requesting a transformer quotation?<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#1Quick_Transformer_RFQ_Checklist\" >1.Quick Transformer RFQ Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#2_Load_Characteristics_The_Specification_Buyers_Often_Miss\" >2. Load Characteristics: The Specification Buyers Often Miss<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#3_Voltage_Vector_Group_Impedance_and_Tap_Changer\" >3. Voltage, Vector Group, Impedance, and Tap Changer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#4_Site_Conditions_Matter_More_Than_%E2%80%9CIndoor_or_Outdoor%E2%80%9D\" >4. Site Conditions Matter More Than \u201cIndoor or Outdoor\u201d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#5_Winding_Material_Cooling_and_Accessories\" >5. Winding Material, Cooling, and Accessories<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Copper_or_Aluminum_Windings\" >Copper or Aluminum Windings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Cooling_Method\" >Cooling Method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Transformer_Accessories\" >Transformer Accessories<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#6_Standards_Testing_and_Documentation\" >6. Standards, Testing, and Documentation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#7_Real_Project_Scenario_33%E2%80%93385_kV_Wind_Power_Transformer\" >7. Real Project Scenario: 33\u201338.5 kV Wind Power Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#8_The_Hidden_Cost_of_an_Incomplete_Transformer_RFQ\" >8. The Hidden Cost of an Incomplete Transformer RFQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Copy-and-Use_Transformer_RFQ_Checklist\" >Copy-and-Use Transformer RFQ Checklist<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Recommended_RFQ_Attachments\" >Recommended RFQ Attachments<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Need_a_Transformer_Quote\" >Need a Transformer Quote?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#Choose_DHDL_for_Your_Transformer_Solutions\" >Choose DHDL for Your Transformer Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#1_What_information_is_required_for_a_transformer_RFQ\" >1. What information is required for a transformer RFQ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#2_Why_is_transformer_capacity_alone_not_enough_for_a_quotation\" >2. Why is transformer capacity alone not enough for a quotation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#3_What_documents_should_I_attach_to_a_transformer_RFQ\" >3. What documents should I attach to a transformer RFQ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#4_Should_site_temperature_and_altitude_be_included_in_the_RFQ\" >4. Should site temperature and altitude be included in the RFQ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/#5_How_should_buyers_compare_transformer_quotations\" >5. How should buyers compare transformer quotations?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-wd-title title wd-12fc9ff7\"><span class=\"ez-toc-section\" id=\"1Quick_Transformer_RFQ_Checklist\"><\/span>1.Quick Transformer RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-33dacb5e\">If you need a preliminary quotation quickly, provide at least the following information:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Required Specification<\/th><th>Example<\/th><\/tr><\/thead><tbody><tr><td>Transformer Type<\/td><td><a href=\"https:\/\/dinghongtransformer.com\/fr\/produit\/6-38-5kv-oil-immersed-distribution-transformer\/\" data-type=\"product\" data-id=\"37408\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Oil-Immersed Distribution Transformer<\/mark><\/a><\/td><\/tr><tr><td>Rated Capacity<\/td><td>1,000 kVA<\/td><\/tr><tr><td>Primary Voltage<\/td><td>11 kV<\/td><\/tr><tr><td>Secondary Voltage<\/td><td>0.4 kV<\/td><\/tr><tr><td>Phase<\/td><td>Three Phase<\/td><\/tr><tr><td>Fr\u00e9quence<\/td><td>50 Hz<\/td><\/tr><tr><td>Vector Group<\/td><td>Dyn11<\/td><\/tr><tr><td>Tap Range<\/td><td>\u00b12 \u00d7 2.5%<\/td><\/tr><tr><td>Short-Circuit Impedance<\/td><td>6%<\/td><\/tr><tr><td>Cooling Method<\/td><td>ONAN<\/td><\/tr><tr><td>Winding Material<\/td><td>Copper<\/td><\/tr><tr><td>Installation<\/td><td>Outdoor<\/td><\/tr><tr><td>Standard<\/td><td>IEC \/ Project Specification<\/td><\/tr><tr><td>Quantity<\/td><td>6 Units<\/td><\/tr><tr><td>Destination<\/td><td>Manila, Philippines<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2ac1168c\">These parameters give the manufacturer a starting point for transformer selection and design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, <strong>capacity and voltage are only the beginning<\/strong>. Some of the most important RFQ information is often hidden in the actual operating conditions.<\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-b1586daf\"><img decoding=\"async\" width=\"405\" height=\"398\" class=\"wp-image-37236 lazyload\" data-src=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/06\/\u4e3b\u56fe\uff096-20KV-2.png\" alt=\"\" data-srcset=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/06\/\u4e3b\u56fe\uff096-20KV-2.png 405w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/06\/\u4e3b\u56fe\uff096-20KV-2-305x300.png 305w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/06\/\u4e3b\u56fe\uff096-20KV-2-150x147.png 150w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/06\/\u4e3b\u56fe\uff096-20KV-2-80x80.png 80w\" data-sizes=\"(max-width: 405px) 100vw, 405px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 405px; --smush-placeholder-aspect-ratio: 405\/398;\" \/><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Load_Characteristics_The_Specification_Buyers_Often_Miss\"><\/span>2. Load Characteristics: The Specification Buyers Often Miss<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-70c90c51\">One of the most common transformer RFQ mistakes is simply writing:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0159ec66\"><strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/industrial-commercial-facilities-solution\/\" data-type=\"page\" data-id=\"38503\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Application: Industrial<\/mark><\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ff715e7d\">That does not tell the transformer manufacturer enough about the actual electrical load.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8c8f1740\">A transformer supplying ordinary commercial building loads may operate very differently from one supplying<strong> <mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/case-studies\/transformer-neutral-loading-why-neutral-current-matters-in-three-phase-systems\/\" data-type=\"post\" data-id=\"38541\">large motors<\/a><\/mark><\/strong>, <strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">variable frequency drives<\/mark><\/strong>,<a href=\"https:\/\/dinghongtransformer.com\/fr\/ev-charging-station-solution\/\" data-type=\"page\" data-id=\"38522\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\"> EV charging equipment<\/mark><\/a>, <strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/utility-power-distribution-solution\/\" data-type=\"page\" data-id=\"38530\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">UPS systems<\/mark><\/a><\/strong>, <strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-to-select-the-right-transformer-for-a-solar-farm-dinghong-transformer\/\" data-type=\"post\" data-id=\"37857\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">solar inverters<\/mark><\/a><\/strong>, or <strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/produit\/electric-furnace-transformer-for-steel-metallurgy\/\" data-type=\"product\" data-id=\"37447\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">electric furnaces<\/mark><\/a><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-22456bbd\">A better description would be:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-862d7041\"><strong>Application: Steel processing plant supplying large motors, VFDs, and auxiliary production equipment.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7803a905\">For special loads, buyers should provide information such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connected load<\/li>\n\n\n\n<li>Maximum demand<\/li>\n\n\n\n<li>Power factor<\/li>\n\n\n\n<li>Largest motor capacity<\/li>\n\n\n\n<li>Motor starting method<\/li>\n\n\n\n<li>Normal operating load<\/li>\n\n\n\n<li>Peak load<\/li>\n\n\n\n<li>Harmonic characteristics<\/li>\n\n\n\n<li>Future expansion requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9c3dd050\">For renewable energy projects, inverter or turbine output characteristics are also important.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ae9e3159\">For example, saying <strong>\u201cWe need a transformer for a 5 MW wind turbine\u201d<\/strong> does not automatically mean a 5,000 kVA transformer should be selected.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-47b4adaa\">The engineering team may still need to evaluate output current, reactive power, harmonics, overload conditions, and grid requirements.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dec89545\"><strong>RFQ Tip:<\/strong> If the transformer supplies VFDs, rectifiers, UPS systems, EV chargers, or other nonlinear loads, tell the manufacturer during the quotation stage rather than after the transformer has already been designed.<\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-ee9ccfed\"><img decoding=\"async\" width=\"1536\" height=\"1024\" class=\"wp-image-38584 lazyload\" data-src=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers.png\" alt=\"\" data-srcset=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers.png 1536w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers-400x267.png 400w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers-1200x800.png 1200w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers-768x512.png 768w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers-430x287.png 430w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers-700x467.png 700w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/Industrial-Applications-of-Transformers-150x100.png 150w\" data-sizes=\"(max-width: 1536px) 100vw, 1536px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1536px; --smush-placeholder-aspect-ratio: 1536\/1024;\" \/><\/div>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-5e6283b6\"><span class=\"ez-toc-section\" id=\"3_Voltage_Vector_Group_Impedance_and_Tap_Changer\"><\/span>3. Voltage, Vector Group, Impedance, and Tap Changer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a4c07b7d\">Instead of writing only <strong>\u201c<a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/types-of-electronic-transformers-and-their-applications-2\/\" data-type=\"post\" data-id=\"38163\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">35 kV transformer<\/mark><\/a>,\u201d<\/strong> provide the complete voltage ratio.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b2fd0949\">Typical examples include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Application<\/th><th>Example Voltage<\/th><\/tr><\/thead><tbody><tr><td>Distribution<\/td><td>11 \/ 0.4 kV<\/td><\/tr><tr><td>Industrial<\/td><td>10 \/ 0.4 kV<\/td><\/tr><tr><td>Renewable Energy<\/td><td>35 \/ 0.69 kV<\/td><\/tr><tr><td>Commercial<\/td><td>33 \/ 0.415 kV<\/td><\/tr><tr><td>High-Voltage Project<\/td><td>110 \/ 35 \/ 10 kV<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fa6a4657\">For medium- and high-voltage projects, buyers should also confirm the required <strong>vector group, short-circuit impedance, and tap range<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c2a0eff0\">A typical specification might be:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-93259fa6\"><strong>33\/0.69 kV \u00b7 Dyn11 \u00b7 6.5% Impedance \u00b7 \u00b12 \u00d7 2.5% Taps<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-452b5003\">Vector group influences:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Phase displacement<\/li>\n\n\n\n<li>Grounding<\/li>\n\n\n\n<li>Neutral configuration<\/li>\n\n\n\n<li>Harmonic behavior<\/li>\n\n\n\n<li>Parallel operation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-997bce1b\">Short-circuit impedance affects:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fault current<\/li>\n\n\n\n<li>Voltage drop<\/li>\n\n\n\n<li>Protection coordination<\/li>\n\n\n\n<li>Parallel operation<\/li>\n\n\n\n<li>Downstream equipment selection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-86fea77c\">Tap settings are used to accommodate voltage variation within the electrical network.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-18e85015\">If voltage adjustment is required, specify whether the transformer needs an <strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/case-studies\/on-load-vs-off-circuit-tap-changer\/\" data-type=\"post\" data-id=\"38492\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Off-Circuit Tap Changer (OCTC)<\/mark><\/a><\/strong> or an <strong>On-Load Tap Changer (OLTC)<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dcf236ad\">If a new transformer will operate in parallel with existing equipment, provide the existing transformer&#8217;s nameplate and available test data.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4e86f1f2\">Do not rely only on capacity and voltage when selecting a transformer for parallel operation.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7c8e9beb\"><span class=\"ez-toc-section\" id=\"4_Site_Conditions_Matter_More_Than_%E2%80%9CIndoor_or_Outdoor%E2%80%9D\"><\/span>4. Site Conditions Matter More Than \u201cIndoor or Outdoor\u201d<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3b5f47f3\">Installation environment is another frequently overlooked part of a <strong>transformer technical specification<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-de79ff29\">Writing only <strong>\u201cInstallation: Outdoor\u201d<\/strong> is often insufficient.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-081bb679\">The transformer manufacturer needs to understand the actual environment in which the equipment will operate.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-56bda26b\">Typical site information should include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Site Condition<\/th><th>Example<\/th><\/tr><\/thead><tbody><tr><td>Installation<\/td><td>Outdoor<\/td><\/tr><tr><td>Maximum Temperature<\/td><td>+45\u00b0C<\/td><\/tr><tr><td>Minimum Temperature<\/td><td>-10\u00b0C<\/td><\/tr><tr><td>Altitude<\/td><td>1,500 m<\/td><\/tr><tr><td>Relative Humidity<\/td><td>95%<\/td><\/tr><tr><td>Environment<\/td><td>Coastal<\/td><\/tr><tr><td>Pollution<\/td><td>Salt \/ High Humidity<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9709c123\">These conditions can influence insulation design, cooling performance, temperature rise, enclosure design, corrosion protection, and material selection.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e32b3cc5\">A transformer installed in a hot and humid coastal region may require different engineering considerations from the same-capacity transformer installed in a dry inland industrial area.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-65e14e06\">High-altitude installations may also require additional thermal and insulation review.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c7957a69\">A useful rule for international transformer procurement is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e4068fe8\"><strong>Country name alone is not an engineering specification.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fe9384eb\">Always provide actual site conditions whenever possible.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-82bf6b3d\"><span class=\"ez-toc-section\" id=\"5_Winding_Material_Cooling_and_Accessories\"><\/span>5. Winding Material, Cooling, and Accessories<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-011339ea\">Construction requirements can create significant differences between transformer quotations.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-b7666fa9\"><span class=\"ez-toc-section\" id=\"Copper_or_Aluminum_Windings\"><\/span><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/copper-vs-aluminum-transformer-windings-which-performs-better\/\" data-type=\"post\" data-id=\"37768\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Copper or Aluminum Windings<\/mark><\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f218245e\">State whether the project requires <strong>Copper (Cu)<\/strong> or <strong>Aluminum (Al)<\/strong> windings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-06f32801\">If both materials are acceptable, ask the manufacturer to provide technically comparable alternatives.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-33410b25\">Do not compare two transformer quotations only by final price if one supplier is offering copper windings and another is offering aluminum.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7ff467fe\">Instead, compare:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Winding material<\/li>\n\n\n\n<li>No-load loss<\/li>\n\n\n\n<li>Load loss<\/li>\n\n\n\n<li>Temperature rise<\/li>\n\n\n\n<li>Efficiency<\/li>\n\n\n\n<li>Dimensions<\/li>\n\n\n\n<li>Weight<\/li>\n\n\n\n<li>Short-circuit performance<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-4b10b35f\"><span class=\"ez-toc-section\" id=\"Cooling_Method\"><\/span>Cooling Method<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1e1367a5\">Common transformer cooling methods include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Transformer Type<\/th><th>Typical Cooling<\/th><\/tr><\/thead><tbody><tr><td>Oil-Immersed Distribution Transformer<\/td><td>ONAN<\/td><\/tr><tr><td>Larger Oil-Immersed Transformer<\/td><td>ONAN \/ ONAF<\/td><\/tr><tr><td>Transformateur de type sec<\/td><td>AN<\/td><\/tr><tr><td>Forced-Air Dry-Type Transformer<\/td><td>AF<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4cdd000d\">Cooling requirements become particularly important for high ambient temperatures, continuous heavy loads, and restricted installation spaces.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-576a9075\"><span class=\"ez-toc-section\" id=\"Transformer_Accessories\"><\/span>Transformer Accessories<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b004f94d\">Depending on the transformer type and project requirements, buyers may need to specify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Buchholz relay<\/li>\n\n\n\n<li>Pressure relief device<\/li>\n\n\n\n<li>Oil level indicator<\/li>\n\n\n\n<li>Oil temperature indicator<\/li>\n\n\n\n<li>Winding temperature indicator<\/li>\n\n\n\n<li>Cooling fans<\/li>\n\n\n\n<li>Surge arresters<\/li>\n\n\n\n<li>Cable boxes<\/li>\n\n\n\n<li>Current transformers<\/li>\n\n\n\n<li>Monitoring devices<\/li>\n\n\n\n<li>Communication interfaces<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-172c1362\">One detail buyers frequently overlook is <strong>cable entry and terminal arrangement<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ee77be85\">A transformer may be electrically correct but still create installation problems if its HV\/LV terminals or cable boxes do not match the electrical room or substation layout.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-e8a7aea4\"><span class=\"ez-toc-section\" id=\"6_Standards_Testing_and_Documentation\"><\/span>6. Standards, Testing, and Documentation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7bacca52\">Do not simply write <strong>\u201cInternational Standard\u201d<\/strong> in the RFQ.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8b19e2ed\">Specify the applicable requirement, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CEI<\/li>\n\n\n\n<li>ANSI\/IEEE<\/li>\n\n\n\n<li>GB<\/li>\n\n\n\n<li>Utility-specific standard<\/li>\n\n\n\n<li>Project technical specification<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e22b537c\">The required standard may influence transformer insulation, testing, accessories, nameplate information, and technical documentation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-89c32910\">Testing requirements should also be agreed during the RFQ stage rather than after production.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6e8a54ea\">Typical transformer tests may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Winding resistance test<\/li>\n\n\n\n<li>Voltage ratio test<\/li>\n\n\n\n<li>Vector group verification<\/li>\n\n\n\n<li>No-load loss test<\/li>\n\n\n\n<li>Load loss test<\/li>\n\n\n\n<li>Short-circuit impedance test<\/li>\n\n\n\n<li>Insulation resistance test<\/li>\n\n\n\n<li>Withstand voltage test<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5c3bebb4\">Depending on transformer type and project requirements, additional testing may also be required.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f7ef9605\">Buyers should specify the technical documents required for project approval.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d8bbd44f\">Common documents include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>General Arrangement Drawing<\/li>\n\n\n\n<li>Technical Datasheet<\/li>\n\n\n\n<li>Nameplate Drawing<\/li>\n\n\n\n<li>Wiring Diagram<\/li>\n\n\n\n<li>Foundation Drawing<\/li>\n\n\n\n<li>Routine Test Reports<\/li>\n\n\n\n<li>Type Test Reports when required<\/li>\n\n\n\n<li>Packing List<\/li>\n\n\n\n<li>Operation and Maintenance Manual<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-aa9bb5c1\">For EPC projects, documentation requirements should be confirmed early because drawing and document approval can affect the manufacturing schedule.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-3eb1c281\"><span class=\"ez-toc-section\" id=\"7_Real_Project_Scenario_33%E2%80%93385_kV_Wind_Power_Transformer\"><\/span>7. Real Project Scenario: <a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/how-to-select-a-33-38-5kv-dry-type-transformer-for-a-wind-power-project\/\" data-type=\"post\" data-id=\"37596\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">33\u201338.5 kV Wind Power Transformer<\/mark><\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8505d9e7\">Consider a wind power project using a <strong>33\u201338.5 kV collection system<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dc1c1c72\">The buyer initially sends:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-500aa90b\"><strong>\u201cPlease quote a transformer for a 5 MW wind turbine.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-482b2ef2\">From a procurement perspective, this may appear sufficient.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a111710f\">From an engineering perspective, several important questions remain.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d283d3b6\">The transformer manufacturer may still need to know:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turbine output voltage<\/li>\n\n\n\n<li>Maximum output current<\/li>\n\n\n\n<li>Required HV voltage<\/li>\n\n\n\n<li>System frequency<\/li>\n\n\n\n<li>Required vector group<\/li>\n\n\n\n<li>Short-circuit impedance<\/li>\n\n\n\n<li>Harmonic characteristics<\/li>\n\n\n\n<li>Tap range<\/li>\n\n\n\n<li>Project altitude<\/li>\n\n\n\n<li>Maximum and minimum ambient temperature<\/li>\n\n\n\n<li>Installation environment<\/li>\n\n\n\n<li>Grid standard<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-faaf7987\">A more useful RFQ might include:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Parameter<\/th><th>Project Requirement<\/th><\/tr><\/thead><tbody><tr><td>Application<\/td><td>Wind Turbine Step-Up<\/td><\/tr><tr><td>Capacity<\/td><td>Confirmed by Load Data<\/td><\/tr><tr><td>HV Voltage<\/td><td>33 \/ 38.5 kV Class<\/td><\/tr><tr><td>LV Voltage<\/td><td>Turbine Output Voltage<\/td><\/tr><tr><td>Fr\u00e9quence<\/td><td>50 Hz<\/td><\/tr><tr><td>Vector Group<\/td><td>Project Specific<\/td><\/tr><tr><td>Installation<\/td><td>Outdoor \/ Nacelle \/ Project Specific<\/td><\/tr><tr><td>Environment<\/td><td>Based on Project Site Conditions<\/td><\/tr><tr><td>Standard<\/td><td>IEC \/ Project Specification<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b26e14bf\">The lesson is straightforward:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fd036a14\"><strong>Do not select a transformer based on MW or kVA alone.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c854d6fd\">Actual operating conditions should be considered before the final transformer design is confirmed.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-07821c4a\"><span class=\"ez-toc-section\" id=\"8_The_Hidden_Cost_of_an_Incomplete_Transformer_RFQ\"><\/span>8. The Hidden Cost of an Incomplete Transformer RFQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dd798427\">The lowest transformer quotation is not necessarily the lowest project cost.<\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-f4af2f62\"><img decoding=\"async\" width=\"1536\" height=\"1024\" class=\"wp-image-38585 lazyload\" data-src=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1.png\" alt=\"\" data-srcset=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1.png 1536w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1-400x267.png 400w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1-1200x800.png 1200w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1-768x512.png 768w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1-430x287.png 430w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1-700x467.png 700w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/09\/transformer-RFQ-checklist1.1-150x100.png 150w\" data-sizes=\"(max-width: 1536px) 100vw, 1536px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1536px; --smush-placeholder-aspect-ratio: 1536\/1024;\" \/><\/div>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3286acf7\">Supplier A may offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aluminum winding<\/li>\n\n\n\n<li>Standard losses<\/li>\n\n\n\n<li>Basic accessories<\/li>\n\n\n\n<li>Standard ambient design<\/li>\n\n\n\n<li>Routine testing only<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3c368c5f\">Supplier B may offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Copper winding<\/li>\n\n\n\n<li>Guaranteed losses<\/li>\n\n\n\n<li>High-temperature design<\/li>\n\n\n\n<li>Additional protection<\/li>\n\n\n\n<li>Project-specific testing<\/li>\n\n\n\n<li>More complete technical documentation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4f69ee98\">These two quotations are not technically equivalent.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7d1c450d\">A better transformer quotation comparison should consider:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9809e53f\"><strong>Technical Compliance + Purchase Price + Energy Losses + Accessories + Testing + Delivery<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-29bf90be\">This is especially important for EPC, industrial, renewable energy, and utility projects where a small purchasing saving can later be outweighed by redesign, installation changes, additional testing, or higher operating losses.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-de2e02ad\"><strong>We have provided some articles related to RFQs\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e62b528d\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/transformer-rfq-checklist-specifications-buyers-must-provide-for-an-accurate-quote\/\" data-type=\"post\" data-id=\"38577\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Transformer RFQ Checklist: Specifications Buyers Must Provide for an Accurate Quote<\/mark><\/a><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a187ca7b\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/product-insights\/transformer-rfq-checklist\/\" data-type=\"post\" data-id=\"38222\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Transformer RFQ Checklist: 15 Specifications Buyers Must Provide for an Accurate Quote<\/mark><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-4921b3ba\"><span class=\"ez-toc-section\" id=\"Copy-and-Use_Transformer_RFQ_Checklist\"><\/span>Copy-and-Use Transformer RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e66847e5\">Before sending your next transformer inquiry, complete as much of this information as possible:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>RFQ Item<\/th><th>Buyer Input<\/th><\/tr><\/thead><tbody><tr><td>Transformer Type<\/td><td>__________<\/td><\/tr><tr><td>Application<\/td><td>__________<\/td><\/tr><tr><td>Rated Capacity<\/td><td>_____ kVA \/ MVA<\/td><\/tr><tr><td>HV \/ LV Voltage<\/td><td>_____ \/ _____ kV<\/td><\/tr><tr><td>Frequency \/ Phase<\/td><td>__________<\/td><\/tr><tr><td>Vector Group<\/td><td>__________<\/td><\/tr><tr><td>Short-Circuit Impedance<\/td><td>_____ %<\/td><\/tr><tr><td>Tap Range \/ Tap Changer<\/td><td>__________<\/td><\/tr><tr><td>Winding Material<\/td><td>Copper \/ Aluminum<\/td><\/tr><tr><td>Cooling Method<\/td><td>__________<\/td><\/tr><tr><td>Maximum \/ Minimum Temperature<\/td><td>__________<\/td><\/tr><tr><td>Altitude<\/td><td>_____ m<\/td><\/tr><tr><td>Installation<\/td><td>Indoor \/ Outdoor<\/td><\/tr><tr><td>Applicable Standard<\/td><td>__________<\/td><\/tr><tr><td>Load Characteristics<\/td><td>__________<\/td><\/tr><tr><td>Required Accessories<\/td><td>__________<\/td><\/tr><tr><td>Required Tests<\/td><td>__________<\/td><\/tr><tr><td>Quantity<\/td><td>_____ Units<\/td><\/tr><tr><td>Destination<\/td><td>__________<\/td><\/tr><tr><td>Required Delivery<\/td><td>__________<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-44cfc5fb\"><span class=\"ez-toc-section\" id=\"Recommended_RFQ_Attachments\"><\/span>Recommended RFQ Attachments<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b9618b81\">Whenever available, attach:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Single-Line Diagram (SLD)<\/li>\n\n\n\n<li>Technical specification<\/li>\n\n\n\n<li>Load schedule<\/li>\n\n\n\n<li>Site-condition information<\/li>\n\n\n\n<li>Site layout or transformer room layout<\/li>\n\n\n\n<li>Required test and documentation list<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-82e392e7\">For transformer replacement or parallel-operation projects, also provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Existing transformer nameplate<\/li>\n\n\n\n<li>Existing transformer technical data<\/li>\n\n\n\n<li>Available factory or site test reports<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e98c606b\">These documents often answer technical questions faster than several rounds of email clarification.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-9085cc30\"><span class=\"ez-toc-section\" id=\"Need_a_Transformer_Quote\"><\/span>Need a Transformer Quote?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2f7857e1\">DHDL provides transformer and power distribution solutions for industrial facilities, utilities, renewable energy projects, and infrastructure applications.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ed5a6633\">When requesting a quotation, send your <strong>capacity, voltage ratio, SLD, load information, site conditions, applicable standard, quantity, and destination<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-938b3b89\">A complete RFQ allows the engineering team to prepare a more accurate technical proposal, identify project-specific requirements earlier, and reduce unnecessary revisions before production.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-9-16 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"DHDL Global Transformer Projects #automobile #drytypetransformer #electricalequipment #dhdl\" width=\"422\" height=\"750\" data-src=\"https:\/\/www.youtube.com\/embed\/fiuH0uxrlGo?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\" data-load-mode=\"0\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4e3ada59\"><strong>DHDL \u2014 Customized Transformer Solutions for Industrial, Utility, and Renewable Energy Projects.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-1aed4569\"><span class=\"ez-toc-section\" id=\"Choose_DHDL_for_Your_Transformer_Solutions\"><\/span>Choose <a href=\"https:\/\/dinghongtransformer.com\/fr\/\">DHDL for Your Transformer Solutions<\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a0093ea7\">DHDL is a professional transformer manufacturer specializing in<a href=\"https:\/\/dinghongtransformer.com\/fr\/shop\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\"> dry-type transformers, oil-immersed transformers, power transformers, distribution transformers, and complete power distribution solutions.<\/mark><\/a><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-aa0d460e\">We support customized transformer designs based on <a href=\"https:\/\/dinghongtransformer.com\/fr\/tag\/project\/\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">project voltage<\/mark><\/strong><\/a>, capacity, frequency, installation environment, and international standards.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c478f7e8\">Whether for industrial facilities, renewable energy projects, data centers, utilities, or infrastructure applications, DHDL delivers reliable, efficient, and customized power solutions worldwide.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-83e18224\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/contactez-nous\/\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">Contact DHDL today for professional transformer selection support and a customized quotation.<\/mark><\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ce31f967\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-bf3a282e\"><span class=\"ez-toc-section\" id=\"1_What_information_is_required_for_a_transformer_RFQ\"><\/span>1. What information is required for a transformer RFQ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7245273c\">At minimum, provide transformer type, application, rated capacity, primary and secondary voltage, frequency, phase, quantity, and destination.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-65229c58\">For a more accurate quotation, also provide vector group, impedance, winding material, site conditions, applicable standards, accessories, and testing requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-e6c87acb\"><span class=\"ez-toc-section\" id=\"2_Why_is_transformer_capacity_alone_not_enough_for_a_quotation\"><\/span>2. Why is transformer capacity alone not enough for a quotation?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4937bc9e\">Transformers with the same kVA rating can have different voltage ratios, vector groups, impedance, winding materials, cooling systems, losses, accessories, and installation requirements.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c861f6c2\">These differences directly affect transformer engineering and quotation price.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-6e5d052a\"><span class=\"ez-toc-section\" id=\"3_What_documents_should_I_attach_to_a_transformer_RFQ\"><\/span>3. What documents should I attach to a transformer RFQ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-117bf334\">The most useful documents include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Single-Line Diagram (SLD)<\/li>\n\n\n\n<li>Technical specification<\/li>\n\n\n\n<li>Load schedule<\/li>\n\n\n\n<li>Site-condition information<\/li>\n\n\n\n<li>Site or electrical-room layout<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c3450847\">For replacement or parallel-operation projects, also provide the existing transformer nameplate and available test data.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-73463328\"><span class=\"ez-toc-section\" id=\"4_Should_site_temperature_and_altitude_be_included_in_the_RFQ\"><\/span>4. Should site temperature and altitude be included in the RFQ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f5bcf27a\">Yes.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0d34c395\">High ambient temperature, altitude, humidity, salt, dust, and other environmental factors can affect transformer cooling, insulation, enclosure design, and corrosion protection.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-235dff9a\"><span class=\"ez-toc-section\" id=\"5_How_should_buyers_compare_transformer_quotations\"><\/span>5. How should buyers compare transformer quotations?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2a9556d3\">Do not compare transformer quotations by purchase price alone.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-18ac9dec\">Compare:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Technical compliance<\/li>\n\n\n\n<li>Winding material<\/li>\n\n\n\n<li>Guaranteed losses<\/li>\n\n\n\n<li>Short-circuit impedance<\/li>\n\n\n\n<li>Cooling method<\/li>\n\n\n\n<li>Accessoires<\/li>\n\n\n\n<li>Testing<\/li>\n\n\n\n<li>Applicable standards<\/li>\n\n\n\n<li>Documentation<\/li>\n\n\n\n<li>Delivery schedule<\/li>\n\n\n\n<li>Final price<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f7826965\">This makes it easier to determine whether different transformer quotations are technically comparable before selecting a supplier.<\/p>","protected":false},"excerpt":{"rendered":"<p>Use this transformer RFQ checklist to prepare an accurate quotation. Learn the key specifications buyers should provide, including kVA, voltage, vector group, impedance, winding, site conditions, testing, and delivery requirements.<\/p>","protected":false},"author":1,"featured_media":38587,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,71,102,73],"tags":[],"class_list":["post-38577","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-case-studies","category-charging-energy-storage","category-industry-standards"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Transformer RFQ Checklist: Specifications Buyers Must Provide for an Accurate Quote - Dinghongtransformer<\/title>\n<meta name=\"description\" content=\"Use this transformer RFQ checklist to prepare an accurate quotation. 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