{"id":2349,"date":"2026-08-12T15:00:00","date_gmt":"2026-08-12T07:00:00","guid":{"rendered":"https:\/\/lbajiele.com\/news\/35kv-oil-immersed-power-transformer-specification-inputs-substations\/"},"modified":"2026-08-12T15:00:00","modified_gmt":"2026-08-12T07:00:00","slug":"35kv-oil-immersed-power-transformer-specification-inputs-substations","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/vi\/blog\/35kv-oil-immersed-power-transformer-specification-inputs-substations\/","title":{"rendered":"M\u00e1y bi\u1ebfn \u00e1p ng\u00e2m d\u1ea7u 35kV: Th\u00f4ng s\u1ed1 \u0111\u1ea7u v\u00e0o cho k\u1ef9 thu\u1eadt tr\u1ea1m bi\u1ebfn \u00e1p"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>A 35kV oil immersed power transformer<\/strong> needs a substation specification before it needs a price comparison. The voltage ratio, capacity basis, vector group, tap requirement, loss basis, impedance target and drawing interfaces define what each supplier is being asked to offer.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Treat a public product table as a reference for available fields. The agreed specification and selected drawings, rather than a catalog row alone, determine the final transformer.<\/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=\"35kV oil immersed transformer for substation specification planning\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/35kv-oil-immersed-power-transformer-specification-inputs-substations-summary.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-define-the-35kv-substation-duty-before-comparing-hardware\">Part 1. Define the 35kV substation duty before comparing hardware<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-build-an-electrical-baseline-that-quotations-can-share\">Part 2. Build an electrical baseline that quotations can share<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-record-ratio-vector-group-and-tap-decisions-together\">Part 3. Record ratio, vector group and tap decisions together<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-compare-loss-and-impedance-on-their-stated-basis\">Part 4. Compare loss and impedance on their stated basis<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-turn-the-substation-interface-into-drawing-and-rfq-inputs\">Part 5. Turn the substation interface into drawing and RFQ inputs<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-use-the-35kv-oil-immersed-series-as-a-catalog-review-point\">Part 6. Use the 35kV oil-immersed series as a catalog review point<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-7-stop-incomplete-specification-assumptions-before-award\">Part 7. Stop incomplete specification assumptions before award<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-define-the-35kv-substation-duty-before-comparing-hardware\">Part 1. Define the 35kV substation duty before comparing hardware<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">The 35kV designation describes one part of the electrical interface, not a complete purchase definition. IEC 60076-1 treats ratings and technical requirements as specification inputs, so the incoming system, outgoing distribution, capacity basis and operating role should be visible before a proposal is assessed (<a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5998\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1<\/a>).<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Start with the single-line diagram and the required transformation duty. This establishes the context for a voltage ratio, winding connection and tap decision.<\/p>\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\">Substation decision<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Buyer should provide<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Review purpose<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Electrical duty<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Single-line diagram and load description<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Defines the transformer role<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Voltage ratio<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required high- and low-voltage values<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Aligns the transformer with both systems<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">C\u01a1 s\u1edf n\u0103ng l\u1ef1c<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required rated capacity and load basis<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Shows what the rating must serve<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Connection requirement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Vector group and grounding information<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Supports system interface coordination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">Use the <a href=\"https:\/\/lbajiele.com\/vi\/transformer\/\">Transformer category<\/a> for product-family context after the project duty is defined.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-build-an-electrical-baseline-that-quotations-can-share\">Part 2. Build an electrical baseline that quotations can share<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">An RFQ becomes comparable when every bidder receives the same electrical baseline. Without it, capacity or price may be compared across different voltage, vector, tap, loss or impedance assumptions.<\/p>\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\">Specification field<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Buyer should provide<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Quotation review use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Voltage ratio<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required high- and low-voltage values<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Confirms system compatibility<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Vector group<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required winding connection<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Makes a connection deviation visible<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Tap requirement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required operating range and tap approach<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Frames the regulating decision<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Loss basis<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Required comparison condition<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Avoids unmatched loss claims<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Impedance<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Project target or study requirement<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Keeps system coordination explicit<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">The <a href=\"https:\/\/lbajiele.com\/vi\/blog\/630kva-oil-immersed-power-transformer-specifications-selection-guide\/\">630KVA oil immersed transformer selection guide<\/a> gives a capacity-specific perspective. A 35kV substation specification still needs its own ratio, tap and drawing interfaces.<\/p>\n<blockquote>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Important:<\/strong> A public vector-group, loss or impedance field is not proof that a proposed transformer matches the substation. The project specification must identify the required values before offers are compared (<a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5998\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1<\/a>).<\/p>\n<\/blockquote>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-record-ratio-vector-group-and-tap-decisions-together\">Part 3. Record ratio, vector group and tap decisions together<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Ratio, vector group and tap information describe connected parts of the transformer interface. The LBAJI 35kV product page publishes catalog fields for rated voltage and connection group, while its product description says that changing the tapping voltage requires the power supply to be cut off for the described switch arrangement (<a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/35kv-oil-immersed-power-transformer\/\">35kV oil-immersed power transformer<\/a>).<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">The inquiry should therefore state the required ratio, vector group and tap requirement together. Do not infer a particular operating or regulating arrangement from a catalog series name.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-compare-loss-and-impedance-on-their-stated-basis\">Part 4. Compare loss and impedance on their stated basis<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Loss and impedance values help normalize a technical comparison only when their stated basis is matched. The product page displays these as catalog fields across S11-*\/35 rows, which makes them useful prompts for the quotation form rather than a substitute for the project design.<\/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=\"Oil immersed transformer for substation interface review\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/35kv-oil-immersed-power-transformer-specification-inputs-substations-interface-review.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\">Catalog or bid field<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Comparison use<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Required boundary<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">No-load and load loss<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Compare values on the stated basis<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Confirm the proposed construction and reference condition<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Impedance<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Compare to the project target<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Confirm the system study requirement<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Connection group<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Check against the requested interface<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Confirm the approved electrical design<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-turn-the-substation-interface-into-drawing-and-rfq-inputs\">Part 5. Turn the substation interface into drawing and RFQ inputs<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">The electrical data must connect to a physical substation arrangement. Request a general arrangement drawing that identifies terminals, equipment interfaces, relevant dimensions and the selected accessory scope.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Send the following with the quotation request:<\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">single-line diagram and required voltage ratio;<\/li>\n<li style=\"margin:0 0 8px\">rated capacity basis, vector group and tap requirement;<\/li>\n<li style=\"margin:0 0 8px\">stated loss basis and impedance target;<\/li>\n<li style=\"margin:0 0 8px\">terminal orientation, cable approach and substation interface information;<\/li>\n<li style=\"margin:0 0 8px\">required general arrangement, datasheet and test-document list; and<\/li>\n<li style=\"margin:0 0 8px\">a clear record of any proposal departure.<\/li>\n<\/ul>\n<p style=\"margin:0 0 16px;line-height:1.7\">The LBAJI product page explicitly notes that dimensions and weight are reference values subject to product drawings. That boundary is why a catalog row should not release a civil layout or terminal arrangement.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-use-the-35kv-oil-immersed-series-as-a-catalog-review-point\">Part 6. Use the 35kV oil-immersed series as a catalog review point<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">For a defined 35kV oil-immersed transformer requirement, the <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/35kv-oil-immersed-power-transformer\/\">35kV oil-immersed power transformer<\/a> page provides a first-party catalog point for reviewing series fields.<\/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=\"35kV oil immersed power transformer for product review\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/35kv-oil-immersed-power-transformer-specification-inputs-substations-product-review.webp\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">It is not a final recommendation when ratio, vector group, tap requirement, impedance, terminals, drawings, protection interfaces or project approvals are unresolved. An on-load tap product is not automatically the alternative simply because a tap function has been mentioned; the required regulating duty must be defined first.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Send the specification inputs and drawing list through <a href=\"https:\/\/lbajiele.com\/vi\/contact-us\/\">Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i<\/a> for a configuration-specific review.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-7-stop-incomplete-specification-assumptions-before-award\">Part 7. Stop incomplete specification assumptions before award<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Do not treat a 35kV label as proof of system compatibility. The IEEE C57.12.00 listing identifies general requirements for liquid-immersed distribution, power and regulating transformers, but the applicable project standard and the offered unit still require an agreed specification (<a href=\"https:\/\/standards.ieee.org\/standard\/C57_12_00-2015.html\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00 standard listing<\/a>).<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">For a larger capacity procurement angle, consult the <a href=\"https:\/\/lbajiele.com\/vi\/blog\/2000kva-oil-immersed-power-specifications-rfq-guide\/\">2000KVA oil immersed transformer RFQ guide<\/a>. Keep its capacity comparison separate from the 35kV substation interface review.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"faqs\">C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3 style=\"margin:28px 0 12px\">What should a 35kV transformer specification state first?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">State the required voltage ratio, capacity basis, vector group, tap requirement, loss basis, impedance target and substation interfaces. Those inputs define what quotations are meant to represent.<\/p>\n<h3 style=\"margin:28px 0 12px\">Why should the vector group be recorded in the specification?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">The vector group identifies the required winding connection arrangement. Recording it prevents a proposal from being treated as equivalent when its connection interface differs from the project requirement.<\/p>\n<h3 style=\"margin:28px 0 12px\">Should a tap arrangement be identified early?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Yes. State the required operating range and tap requirement in the inquiry so bidders respond to the same regulating need. Do not infer the final arrangement from a series name alone.<\/p>\n<h3 style=\"margin:28px 0 12px\">How should loss and impedance values be compared?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Compare them only when each proposal states the same required basis and the values are checked against the project electrical requirements. A public catalog field is a prompt for confirmation, not an approval.<\/p>\n<h3 style=\"margin:28px 0 12px\">Can catalog dimensions set the substation layout?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">No. The product page treats dimensions and weight as references subject to product drawings. The final layout needs the issued drawing, terminals, cable approach, interfaces and access arrangements.<\/p>\n<h3 style=\"margin:28px 0 12px\">What should be sent for a quotation review?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Send the single-line diagram, voltage ratio, capacity basis, vector group, tap requirement, loss basis, impedance target, terminal arrangement and required drawings and documents.<\/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\/5998\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1 publication record for power transformers<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/standard\/C57_12_00-2015.html\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00 standard listing for liquid-immersed transformers<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A 35kV oil immersed power transformer needs a substation specification before it needs a price comparison. The voltage ratio, capacity basis, vector group, tap requirement, loss basis, impedance target and drawing interfaces define what each supplier is being asked to offer. Treat a public product table as a reference for available fields. The agreed specification [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2345,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31],"tags":[],"class_list":["post-2349","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/comments?post=2349"}],"version-history":[{"count":0,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2349\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media\/2345"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media?parent=2349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/categories?post=2349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/tags?post=2349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}