{"id":38222,"date":"2026-08-13T04:01:53","date_gmt":"2026-08-13T04:01:53","guid":{"rendered":"https:\/\/dinghongtransformer.com\/?p=38222"},"modified":"2026-09-01T06:51:15","modified_gmt":"2026-09-01T06:51:15","slug":"transformer-rfq-checklist","status":"publish","type":"post","link":"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/","title":{"rendered":"Transformer RFQ Checklist: 15 Specifications Buyers Must Provide for an Accurate Quote"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-1961de2f\">A request that says only \u201cPlease quote a 1,000 kVA transformer\u201d is not enough for a reliable technical and commercial proposal.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-01c39566\">Two transformers with the same capacity can have very different prices, dimensions, losses, accessories and delivery schedules. The final design depends on voltage, frequency, vector group, impedance, installation environment, applicable standards and many other project conditions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9b01c7a7\">Missing information usually leads to additional emails, delayed quotations or a proposal based on assumptions. More seriously, an incorrectly specified transformer may not match the local grid, protection system or connected load.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b381bb92\">Use the following transformer RFQ checklist before sending your inquiry to a manufacturer.<\/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\">\u00cdndice de contenidos<\/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=\"Alternar tabla de contenidos\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#Quick_Transformer_RFQ_Checklist\" >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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#1_Transformer_Type_and_Application\" >1. Transformer Type and Application<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#2_Rated_Capacity\" >2. Rated Capacity<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#3_Primary_and_Secondary_Voltage\" >3. Primary and Secondary Voltage<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#4_Frequency_and_Phase\" >4. Frequency and Phase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#5_Vector_Group_and_Neutral_Requirements\" >5. Vector Group and Neutral Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#6_Tap_Changer_Requirements\" >6. Tap Changer Requirements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#7_Short-Circuit_Impedance\" >7. Short-Circuit Impedance<\/a><\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#8_Cooling_Method_and_Temperature-Rise_Limits\" >8. Cooling Method and Temperature-Rise Limits<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#9_Winding_Material\" >9. Winding Material<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#10_Installation_Environment\" >10. Installation Environment<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#11_Applicable_Standards\" >11. Applicable Standards<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#12_Load_Characteristics\" >12. Load Characteristics<\/a><\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#13_Required_Accessories_and_Interfaces\" >13. Required Accessories and Interfaces<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#14_Tests_Documents_and_Witness_Requirements\" >14. Tests, Documents and Witness Requirements<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#15_Quantity_Delivery_and_Commercial_Information\" >15. Quantity, Delivery and Commercial Information<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#The_Most_Common_RFQ_Mistakes\" >The Most Common RFQ Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#Send_a_Complete_Transformer_Inquiry\" >Send a Complete Transformer Inquiry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#FAQ\" >Preguntas frecuentes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#What_is_the_minimum_information_needed_for_a_transformer_quotation\" >What is the minimum information needed for a transformer quotation?<\/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\/es\/blog\/product-insights\/transformer-rfq-checklist\/#Can_I_request_a_quote_if_the_transformer_capacity_is_not_confirmed\" >Can I request a quote if the transformer capacity is not confirmed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#Why_does_the_supplier_need_the_vector_group\" >Why does the supplier need the vector group?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#What_documents_should_I_attach_to_the_RFQ\" >What documents should I attach to the RFQ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#Why_do_quotations_for_the_same_kVA_rating_differ_significantly\" >Why do quotations for the same kVA rating differ significantly?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/dinghongtransformer.com\/es\/blog\/product-insights\/transformer-rfq-checklist\/#Choose_DHDL_for_Your_Transformer_Solutions\" >Elija DHDL para sus soluciones de transformadores<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-wd-title title wd-4f879d4d\"><span class=\"ez-toc-section\" id=\"Quick_Transformer_RFQ_Checklist\"><\/span>Quick Transformer RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fc6f0fc4\">At minimum, provide the following information:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Required information<\/th><th>Ejemplo<\/th><\/tr><tr><td>Transformer type<\/td><td>Oil-immersed distribution transformer<\/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>Frecuencia<\/td><td>50 Hz<\/td><\/tr><tr><td>Fase<\/td><td>Three-phase<\/td><\/tr><tr><td>Vector group<\/td><td>Dyn11<\/td><\/tr><tr><td>Tap range<\/td><td>\u00b12 \u00d7 2,51 TP3T<\/td><\/tr><tr><td>Short-circuit impedance<\/td><td>6%<\/td><\/tr><tr><td>Cooling method<\/td><td>On\u00e1n<\/td><\/tr><tr><td>Winding material<\/td><td>Cobre<\/td><\/tr><tr><td>Instalaci\u00f3n<\/td><td>Al aire libre<\/td><\/tr><tr><td>Applicable standard<\/td><td>IEC or project specification<\/td><\/tr><tr><td>Cantidad<\/td><td>6 units<\/td><\/tr><tr><td>Destino<\/td><td>Manila, Filipinas<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bc5505f4\">This information is enough for an initial quotation in many standard projects. However, buyers should provide the following details when available.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-aa52fc13\"><strong>We have provided some articles related to RFQs<\/strong>\uff1a<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0f568f90\"><a href=\"https:\/\/dinghongtransformer.com\/es\/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\">Lista de verificaci\u00f3n para solicitudes de presupuesto de transformadores: Especificaciones que los compradores deben proporcionar para una cotizaci\u00f3n precisa<\/mark><\/a><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d0e04887\"><a href=\"https:\/\/dinghongtransformer.com\/es\/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<div class=\"wp-block-wd-image wd-block-image wd-ad6671a3\"><img decoding=\"async\" width=\"1672\" height=\"941\" class=\"wp-image-38224 lazyload\" data-src=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2.png\" alt=\"\" data-srcset=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2.png 1672w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-400x225.png 400w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-1300x732.png 1300w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-768x432.png 768w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-1536x864.png 1536w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-430x242.png 430w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-700x394.png 700w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/08\/blog2-150x84.png 150w\" data-sizes=\"(max-width: 1672px) 100vw, 1672px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1672px; --smush-placeholder-aspect-ratio: 1672\/941;\" \/><\/div>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7ded6b05\"><span class=\"ez-toc-section\" id=\"1_Transformer_Type_and_Application\"><\/span>1. Transformer Type and Application<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ee6f7b49\">Start by identifying the required transformer and its actual use.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-16b1064d\">Common types include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/dinghongtransformer.com\/es\/producto\/6-38-5kv-oil-immersed-distribution-transformer\/\" data-type=\"product\" data-id=\"37408\">Oil-immersed distribution transformer<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/dinghongtransformer.com\/es\/categoria-producto\/transformers\/dry-type-transformer\/\" data-type=\"product_cat\" data-id=\"76\">Dry-type transformer<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/dinghongtransformer.com\/es\/blog\/power-transformer-vs-distribution-transformer-what-is-the-difference-2\/\" data-type=\"post\" data-id=\"38215\">Power transformer<\/a><\/li>\n\n\n\n<li>Pole-mounted transformer<\/li>\n\n\n\n<li>Pad-mounted transformer<\/li>\n\n\n\n<li>Furnace or rectifier transformer<\/li>\n\n\n\n<li>Renewable energy step-up transformer<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5b2c8fa0\">The application is equally important. A transformer for a commercial building does not have the same operating profile as one serving motors, furnaces, data centers, solar inverters or EV charging equipment.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cc082396\">Do not write only \u201cfor industrial use.\u201d State the connected load and operating scenario.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6981cb2c\"><span class=\"ez-toc-section\" id=\"2_Rated_Capacity\"><\/span>2. Rated Capacity<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-359fc607\">Provide the required capacity in kVA or MVA.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-052811ac\">If the final size has not been confirmed, send:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Total connected load<\/li>\n\n\n\n<li>Estimated demand load<\/li>\n\n\n\n<li>Factor de potencia<\/li>\n\n\n\n<li>Largest motor or starting load<\/li>\n\n\n\n<li>Expected future expansion<\/li>\n\n\n\n<li>Normal and peak load profiles<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a7d23ddc\">A manufacturer can review these inputs, but the final capacity should also be confirmed by the project\u2019s qualified electrical engineer.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-118c70a2\">A common hidden mistake is selecting capacity from the present load only. Future expansion, motor starting current, harmonics and ambient temperature may affect the appropriate rating.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-af6b8a5c\"><span class=\"ez-toc-section\" id=\"3_Primary_and_Secondary_Voltage\"><\/span>3. Primary and Secondary Voltage<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2904d086\">State both nominal primary and secondary voltage.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-12b07eac\">For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>11\/0.4 kV<\/li>\n\n\n\n<li>33\/0.415 kV<\/li>\n\n\n\n<li>13.2 kV\/240\u2013480 V<\/li>\n\n\n\n<li>110\/35\/10 kV<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2364b0a7\">Do not assume that \u201clow voltage\u201d means the same value in every country. Also clarify whether the requested secondary voltage is the transformer\u2019s no-load rated voltage or the required system voltage under operating conditions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ed9bf513\">If the grid voltage fluctuates significantly, provide the normal operating range.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-beab638b\"><span class=\"ez-toc-section\" id=\"4_Frequency_and_Phase\"><\/span>4. Frequency and Phase<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a47d75ba\">Confirm whether the system uses 50 Hz or 60 Hz and whether it is single-phase or three-phase.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-faa1681e\">Frequency affects the transformer\u2019s electromagnetic design. It should never be left for the supplier to guess based only on the destination country, especially for industrial plants with independent power systems.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-e9f324ba\"><span class=\"ez-toc-section\" id=\"5_Vector_Group_and_Neutral_Requirements\"><\/span>5. Vector Group and Neutral Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1f6ac3e5\">For three-phase transformers, provide the required vector group, such as Dyn11, Yyn0 or another project-specific arrangement.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a69509cf\">The vector group affects phase displacement, grounding, neutral availability and parallel operation. If the new transformer will operate in parallel with an existing unit, provide the existing transformer\u2019s nameplate and test data.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-39ed34f9\">Also clarify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Whether a neutral terminal is required<\/li>\n\n\n\n<li>Expected neutral loading<\/li>\n\n\n\n<li>Grounding method<\/li>\n\n\n\n<li>Whether the neutral must be fully rated<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ee4cd179\">This is frequently missed in RFQs for data centers, nonlinear loads and commercial facilities.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d90462b4\"><span class=\"ez-toc-section\" id=\"6_Tap_Changer_Requirements\"><\/span>6. Tap Changer Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f4382847\">State the required tap range and tap changer type.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-62bf291c\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Off-circuit tap changer: \u00b15%<\/li>\n\n\n\n<li>Off-circuit taps: \u00b12 \u00d7 2.5%<\/li>\n\n\n\n<li>On-load tap changer with a project-defined regulation range<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-363029bf\">If an on-load tap changer is required, include the number of positions, step voltage, control method and any automatic voltage regulation requirement.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-77434fc5\"><span class=\"ez-toc-section\" id=\"7_Short-Circuit_Impedance\"><\/span>7. Short-Circuit Impedance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5ada0615\">Impedance is not a minor nameplate value. It affects fault current, voltage drop, protection coordination and parallel operation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b14d5bb7\">Provide the specified impedance and tolerance if these have already been calculated. For replacement or parallel transformers, send the existing unit\u2019s impedance rather than requesting \u201cstandard impedance.\u201d<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e53d7215\">Changing impedance to reduce the purchase price may create additional costs elsewhere in the electrical system.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-1813830c\"><span class=\"ez-toc-section\" id=\"8_Cooling_Method_and_Temperature-Rise_Limits\"><\/span>8. Cooling Method and Temperature-Rise Limits<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ecdaa62c\">Specify the required cooling method, such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>On\u00e1n<\/li>\n\n\n\n<li>ONAF<\/li>\n\n\n\n<li>OFAF<\/li>\n\n\n\n<li>Air natural cooling<\/li>\n\n\n\n<li>Forced-air cooling<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5a99d274\">Also provide the required temperature-rise limits if stated in the project specification.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-80aa2891\">For transformers with multiple cooling stages, list the capacity available at each stage. For example, the ONAN and ONAF ratings should be clearly separated.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-55e2394b\"><span class=\"ez-toc-section\" id=\"9_Winding_Material\"><\/span>9. Winding Material<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-63ef2536\">Confirm whether the project requires copper or aluminum windings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-15db28a7\">Do not compare quotations based on total price until the conductor material is confirmed. Buyers should also compare:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Guaranteed no-load loss<\/li>\n\n\n\n<li>Guaranteed load loss<\/li>\n\n\n\n<li>Transformer weight<\/li>\n\n\n\n<li>Temperature rise<\/li>\n\n\n\n<li>Short-circuit strength<\/li>\n\n\n\n<li>Total operating cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-79a4b150\">If either material is acceptable, ask the supplier to provide two technically comparable options instead of quoting two designs with different loss targets.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-0e28510f\"><span class=\"ez-toc-section\" id=\"10_Installation_Environment\"><\/span>10. Installation Environment<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8b498250\">Site conditions can change the insulation, cooling and enclosure design. Provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Indoor or outdoor installation<\/li>\n\n\n\n<li>Maximum and minimum ambient temperature<\/li>\n\n\n\n<li>Altitude above sea level<\/li>\n\n\n\n<li>Relative humidity<\/li>\n\n\n\n<li>Dust, salt, sand or corrosive conditions<\/li>\n\n\n\n<li>Seismic requirements<\/li>\n\n\n\n<li>Flood risk<\/li>\n\n\n\n<li>Available ventilation<\/li>\n\n\n\n<li>Required enclosure or IP rating<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-29d97fee\">High altitude and high ambient temperature are often discovered too late. They may require design adjustments and can affect transformer dimensions and cost.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-e71a9845\"><span class=\"ez-toc-section\" id=\"11_Applicable_Standards\"><\/span>11. Applicable Standards<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-29bf26e2\">Identify the required standard system and edition, such as IEC, ANSI\/IEEE, GB or a utility-specific specification.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-419b7561\">Attach the complete technical specification when possible. Do not state only \u201cinternational standard,\u201d because test requirements, insulation levels, efficiency rules and accessories vary between markets.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e043e7bd\">If the project has mandatory local certification or utility approval requirements, mention them at the RFQ stage.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-38d311c5\"><span class=\"ez-toc-section\" id=\"12_Load_Characteristics\"><\/span>12. Load Characteristics<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c9083538\">Describe what the transformer will supply.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c38c0c02\">Important information includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Motor loads and starting method<\/li>\n\n\n\n<li>Variable-frequency drives<\/li>\n\n\n\n<li>Rectifiers or furnaces<\/li>\n\n\n\n<li>Solar or wind inverters<\/li>\n\n\n\n<li>EV chargers<\/li>\n\n\n\n<li>Sistemas UPS<\/li>\n\n\n\n<li>Data center loads<\/li>\n\n\n\n<li>Harmonic spectrum or total harmonic distortion<\/li>\n\n\n\n<li>Frequent overload or cyclic loading<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e15448ef\">A standard distribution transformer may not be suitable for severe harmonics, rapid load changes or repeated impact loads.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-db97d711\"><span class=\"ez-toc-section\" id=\"13_Required_Accessories_and_Interfaces\"><\/span>13. Required Accessories and Interfaces<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5247dfe1\">Accessories can create a large difference between quotations. Specify requirements such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Temperature indicators or controllers<\/li>\n\n\n\n<li>Pressure relief device<\/li>\n\n\n\n<li>Oil level indicator<\/li>\n\n\n\n<li>Buchholz relay<\/li>\n\n\n\n<li>Winding temperature indicator<\/li>\n\n\n\n<li>Fans and control cabinet<\/li>\n\n\n\n<li>Surge arresters<\/li>\n\n\n\n<li>Cable boxes or busbar connections<\/li>\n\n\n\n<li>Current transformers<\/li>\n\n\n\n<li>Monitoring communication<\/li>\n\n\n\n<li>Terminal material and orientation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-755ce080\">Include cable entry direction, terminal position and available installation space. A technically correct transformer can still create site problems if its interfaces do not match the civil and electrical layout.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-21f23b90\"><span class=\"ez-toc-section\" id=\"14_Tests_Documents_and_Witness_Requirements\"><\/span>14. Tests, Documents and Witness Requirements<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e68300c0\">List the required routine, type and special tests. State whether the buyer or a third-party inspector will witness testing.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d7893ee1\">Typical document requirements may include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>General arrangement drawing<\/li>\n\n\n\n<li>Nameplate drawing<\/li>\n\n\n\n<li>Technical data sheet<\/li>\n\n\n\n<li>Test reports<\/li>\n\n\n\n<li>Wiring diagrams<\/li>\n\n\n\n<li>Foundation plan<\/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-5d9a6cc0\"><a href=\"https:\/\/dinghongtransformer.com\/es\/manufacture-capability\/\">DHDL\u2019s manufacturing process<\/a> includes material inspection, winding, vacuum drying, assembly and final testing. Required tests and documents should still be agreed before order confirmation.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-460c97c8\"><span class=\"ez-toc-section\" id=\"15_Quantity_Delivery_and_Commercial_Information\"><\/span>15. Quantity, Delivery and Commercial Information<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-add9a3d2\">An accurate quotation also requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Order quantity<\/li>\n\n\n\n<li>Required delivery date<\/li>\n\n\n\n<li>Destination city and country<\/li>\n\n\n\n<li>Preferred Incoterm<\/li>\n\n\n\n<li>Shipping method<\/li>\n\n\n\n<li>Site unloading limitations<\/li>\n\n\n\n<li>Maximum transport dimensions or weight<\/li>\n\n\n\n<li>Spare parts requirements<\/li>\n\n\n\n<li>Warranty requirement<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3cf85554\">For large power transformers, route restrictions and transport dimensions should be reviewed during design\u2014not after production.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d0573d23\"><span class=\"ez-toc-section\" id=\"The_Most_Common_RFQ_Mistakes\"><\/span>The Most Common RFQ Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-29ef3b63\">Before sending your inquiry, check that you have not:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Requested price using capacity alone<\/li>\n\n\n\n<li>Omitted frequency or phase<\/li>\n\n\n\n<li>Assumed the supplier will select the vector group<\/li>\n\n\n\n<li>Ignored altitude, temperature or harmonics<\/li>\n\n\n\n<li>Compared copper and aluminum designs as if they were identical<\/li>\n\n\n\n<li>Requested parallel operation without existing nameplate data<\/li>\n\n\n\n<li>Forgotten cable entry, terminal orientation or accessories<\/li>\n\n\n\n<li>Asked for \u201cIEC standard\u201d without attaching the project specification<\/li>\n\n\n\n<li>Requested delivery without providing destination and inspection requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4702f895\">These details may look small, but they often determine whether a quotation is useful or merely preliminary.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-e2b97da6\"><span class=\"ez-toc-section\" id=\"Send_a_Complete_Transformer_Inquiry\"><\/span>Send a Complete Transformer Inquiry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b628c44a\">A complete RFQ helps the manufacturer prepare a faster and more technically comparable proposal. It also reduces redesign, commercial variation and installation risk later in the project.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3c7a26bf\">DHDL supplies <a href=\"https:\/\/dinghongtransformer.com\/es\/\">transformers and power distribution equipment<\/a> for utility, industrial, commercial and renewable energy projects, with support for different voltage levels, frequencies, winding materials, standards and operating environments.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-17eeeee5\">When contacting DHDL, send your specification, single-line diagram, load information, quantity, destination and required delivery schedule. If some parameters have not yet been confirmed, identify them clearly instead of leaving them blank.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-68c00b79\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>Preguntas frecuentes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-cfd2c650\"><span class=\"ez-toc-section\" id=\"What_is_the_minimum_information_needed_for_a_transformer_quotation\"><\/span>What is the minimum information needed for a transformer quotation?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-759243c6\">Provide transformer type, capacity, primary and secondary voltage, frequency, phase, quantity, application and destination. More detailed information will produce a more accurate quotation.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-341a80ba\"><span class=\"ez-toc-section\" id=\"Can_I_request_a_quote_if_the_transformer_capacity_is_not_confirmed\"><\/span>Can I request a quote if the transformer capacity is not confirmed?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7bfbac15\">Yes. Provide the connected load, demand factor, power factor, largest motor, load profile and future expansion plan for preliminary review. Final sizing should be confirmed by the project engineer.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-baa2cfb5\"><span class=\"ez-toc-section\" id=\"Why_does_the_supplier_need_the_vector_group\"><\/span>Why does the supplier need the vector group?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0637f39b\">The vector group affects phase displacement, grounding, neutral configuration and parallel operation. An incorrect vector group may prevent the transformer from matching the power system.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-98800dbf\"><span class=\"ez-toc-section\" id=\"What_documents_should_I_attach_to_the_RFQ\"><\/span>What documents should I attach to the RFQ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7a92fc44\">Attach the technical specification, single-line diagram, load schedule, existing transformer nameplate, site conditions and required test or documentation list when available.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-59794d22\"><span class=\"ez-toc-section\" id=\"Why_do_quotations_for_the_same_kVA_rating_differ_significantly\"><\/span>Why do quotations for the same kVA rating differ significantly?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4d260e54\">The designs may use different winding materials, loss levels, insulation requirements, impedance, cooling systems, accessories, standards or test scopes. Compare technical compliance before comparing total price.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-eea74883\"><span class=\"ez-toc-section\" id=\"Choose_DHDL_for_Your_Transformer_Solutions\"><\/span>Choose <a href=\"https:\/\/dinghongtransformer.com\/es\/\">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-1dbc70ec\">DHDL is a professional transformer manufacturer specializing in<a href=\"https:\/\/dinghongtransformer.com\/es\/shop\/\"> dry-type transformers, oil-immersed transformers, power transformers, distribution transformers, and complete power distribution solutions.<\/a><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9bfd8b56\">We support customized transformer designs based on <a href=\"https:\/\/dinghongtransformer.com\/es\/tag\/project\/\">project voltage<\/a>, capacity, frequency, installation environment, and international standards.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bccedc54\">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-7ef9c4c9\"><a href=\"https:\/\/dinghongtransformer.com\/es\/contactenos\/\">Contact DHDL today for professional transformer selection support and a customized quotation.<\/a><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-55c90226\">\ud83d\udcacWeChat\/WhatsApp\uff1a+8613355383777<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dacbc970\">\ud83d\udce9 Email\uff1aservice@dinghongtransformer.com<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83c\udf10<\/strong>web\uff1ahttps:\/\/dinghongtransformer.com\/<\/p>","protected":false},"excerpt":{"rendered":"<p>Use this transformer RFQ checklist to submit capacity, voltage, impedance, cooling, standards and site data for a faster, more accurate quotation.<\/p>","protected":false},"author":1,"featured_media":38225,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71,96,73,70,97],"tags":[],"class_list":["post-38222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-case-studies","category-completed-projects","category-industry-standards","category-product-insights","category-renewable-energy-projects"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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