{"id":590,"date":"2025-03-24T06:43:37","date_gmt":"2025-03-24T06:43:37","guid":{"rendered":"https:\/\/pineele.com\/?p=590"},"modified":"2025-04-08T03:18:33","modified_gmt":"2025-04-08T03:18:33","slug":"220-33-kv-transformer-specification-complete-technical-guide","status":"publish","type":"post","link":"https:\/\/pineele.com\/de\/220-33-kv-transformer-specification-complete-technical-guide","title":{"rendered":"220\/33 kV Transformer Specification: Complete Technical Guide"},"content":{"rendered":"<h2 class=\"wp-block-heading\"> Introduction to 220\/33 kV Power Transformer<\/h2>\n\n\n\n<p>A <strong>220\/33 kV transformer<\/strong> is a high-voltage step-down power transformer used in transmission substations to reduce voltage from 220 kV to 33 kV for further distribution. These <a href=\"https:\/\/pineele.com\/de\/1000-kva-substation-complete-design-layout-guide\/\">transformers<\/a> are critical in grid substations, industrial plants, and renewable energy interconnection facilities.<\/p>\n\n\n\n<p>At PINEELE, we design and manufacture advanced <strong>220\/33 kV power <a href=\"https:\/\/pineele.com\/de\/1000-kva-substation-complete-design-layout-guide\/\" rel=\"nofollow\" title=\"transformers\" target=\"_blank\">transformers guide<\/a><\/strong> with high efficiency, superior insulation, and compliance with IEC, ANSI, and GB standards.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"828\" height=\"558\" src=\"https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798407.webp\" alt=\"220\/33 kV Transformer Specification\" class=\"wp-image-591\" srcset=\"https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798407.webp 828w, https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798407-300x202.webp 300w, https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798407-768x518.webp 768w\" sizes=\"(max-width: 828px) 100vw, 828px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"> Standard Electrical Specifications<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Parameter<\/th><th>Typical Value \/ Description<\/th><\/tr><tr><td>Rated Power<\/td><td>25 MVA, 31.5 MVA, 40 MVA, 63 MVA, etc.<\/td><\/tr><tr><td>Primary Voltage<\/td><td>220 kV<\/td><\/tr><tr><td>Secondary Voltage<\/td><td>33 kV<\/td><\/tr><tr><td>Frequency<\/td><td>50 Hz or 60 Hz<\/td><\/tr><tr><td>Number of Phases<\/td><td>3-phase<\/td><\/tr><tr><td>Vector Group<\/td><td>YNd11 \/ YNyn0 \/ YNd1<\/td><\/tr><tr><td>Tap Changer<\/td><td>OLTC \u00b110% in 16 steps or OCTC \u00b15%<\/td><\/tr><tr><td>Insulation Class (HV\/LV)<\/td><td>A\/B\/F\/H (depends on design)<\/td><\/tr><tr><td>Cooling Type<\/td><td>ONAN \/ ONAF \/ OFAF \/ OFWF<\/td><\/tr><tr><td>Impedance<\/td><td>8\u201312% (based on capacity &amp; design)<\/td><\/tr><tr><td>Temperature Rise<\/td><td>55\u00b0C \/ 65\u00b0C<\/td><\/tr><tr><td>Standard<\/td><td>IEC 60076 \/ ANSI C57 \/ GB 6451<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"> Construction Features<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>Core<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cold-rolled grain-oriented silicon steel<\/li>\n\n\n\n<li>Low loss, laminated and clamped<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Windings<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Copper conductor (Paper or Nomex insulated)<\/li>\n\n\n\n<li>Helical or disc type winding<\/li>\n\n\n\n<li>LV: layer windings; HV: disc windings<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>Tank &amp; Conservator<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hermetically sealed or conservator tank<\/li>\n\n\n\n<li>Mild steel or stainless steel<\/li>\n\n\n\n<li>Radiator panels or external oil coolers<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>Bushing and Terminals<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Porcelain or polymer bushings<\/li>\n\n\n\n<li>HV: 220 kV class; LV: 36\u201340.5 kV class<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>Cooling System<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ONAN for natural cooling<\/li>\n\n\n\n<li>ONAF or OFAF for higher loads with fans or pumps<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"674\" height=\"593\" src=\"https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798498.webp\" alt=\"220\/33 kV Transformer Specification\" class=\"wp-image-592\" srcset=\"https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798498.webp 674w, https:\/\/pineele.com\/wp-content\/uploads\/2025\/03\/snap_1742798498-300x264.webp 300w\" sizes=\"(max-width: 674px) 100vw, 674px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"> Dimensional Specifications<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Capacity (MVA)<\/td><td>L x W x H (m)<\/td><td>Weight (tons)<\/td><\/tr><tr><td>25 MVA<\/td><td>4.2 x 2.6 x 3.4<\/td><td>~28 tons<\/td><\/tr><tr><td>31.5 MVA<\/td><td>4.5 x 2.8 x 3.6<\/td><td>~32 tons<\/td><\/tr><tr><td>40 MVA<\/td><td>4.8 x 3.0 x 3.8<\/td><td>~36 tons<\/td><\/tr><tr><td>63 MVA<\/td><td>5.2 x 3.2 x 4.0<\/td><td>~45 tons<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Dimensions vary by cooling type and protection accessories.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\"> Protection and Monitoring<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Buchholz Relay (Gas detection)<\/li>\n\n\n\n<li>WTI \/ OTI (Winding &amp; Oil Temp Indicators)<\/li>\n\n\n\n<li>PRD (Pressure Relief Device)<\/li>\n\n\n\n<li>Oil Level Indicator (Magnetic or float type)<\/li>\n\n\n\n<li>On-load Tap Changer Controller (OLTC motor drive)<\/li>\n\n\n\n<li>Bushing CTs and LV metering<\/li>\n\n\n\n<li>Digital Monitoring (optional IoT sensors, SCADA compatible)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"> Cooling Methods Explained<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Cooling Type<\/td><td>Description<\/td><td>Anwendungen<\/td><\/tr><tr><td>ONAN<\/td><td>Oil Natural Air Natural<\/td><td>Up to 31.5 MVA<\/td><\/tr><tr><td>ONAF<\/td><td>Oil Natural Air Forced (fans)<\/td><td>31.5\u201363 MVA<\/td><\/tr><tr><td>OFAF<\/td><td>Oil Forced Air Forced (fans &amp; pumps)<\/td><td>Large stations or peak loads<\/td><\/tr><tr><td>OFWF<\/td><td>Oil Forced Water Forced<\/td><td>High-capacity industrial use<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"> Accessories and Optional Features<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Radiators (bolt-on or corrugated)<\/li>\n\n\n\n<li>Oil filtration valves<\/li>\n\n\n\n<li>Drain valve with sampling point<\/li>\n\n\n\n<li>Nitrogen injection system (optional)<\/li>\n\n\n\n<li>OLTC panel with local\/remote operation<\/li>\n\n\n\n<li>Arcing horns, disconnecting links<\/li>\n\n\n\n<li>Smart transformer integration (IoT-ready)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"> Installation Considerations<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Foundation pad based on weight and seismic load<\/li>\n\n\n\n<li>HV and LV cable trench alignment<\/li>\n\n\n\n<li>Minimum clearance: 3.5m HV side, 2.5m LV side<\/li>\n\n\n\n<li>Earthing system design (&lt; 1\u03a9 resistance target)<\/li>\n\n\n\n<li>Oil containment pit for environmental safety<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"> Applications of 220\/33 kV Transformers<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transmission &amp; Distribution (T&amp;D) substations<\/li>\n\n\n\n<li>Renewable energy step-down systems (wind, solar farms)<\/li>\n\n\n\n<li>Large industrial power networks<\/li>\n\n\n\n<li>Utility grid substations<\/li>\n\n\n\n<li>Smart city infrastructure<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"> Why Choose PINEELE?<\/h2>\n\n\n\n<p>PINEELE is a trusted supplier of <strong>high-voltage transformers<\/strong> with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In-house design and testing labs<\/li>\n\n\n\n<li>Compliance with IEC, GB, and ANSI standards<\/li>\n\n\n\n<li>Short lead time and global logistics<\/li>\n\n\n\n<li>SCADA and IoT-ready smart options<\/li>\n\n\n\n<li>Customized designs up to 100 MVA \/ 220 kV<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udce7 Email: <a href=\"mailto:pine@zhengxi1983.com\">pine@zhengxi1983.com<\/a><br>\ud83d\udcde Phone: +86-18968823915<br>\ud83d\udcac WhatsApp <a href=\"https:\/\/wa.me\/8618058868393\">Support Available<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"> Frequently Asked Questions (FAQs)<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1744082246448\"><strong class=\"schema-faq-question\">Q1: What is the oil capacity of a 220\/33 kV transformer?<\/strong> <p class=\"schema-faq-answer\"><strong>A:<\/strong> For a 40 MVA unit, oil volume is typically 6,000\u20139,000 liters, depending on the cooling system.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1744082252874\"><strong class=\"schema-faq-question\">Q2: How long does manufacturing take?<\/strong> <p class=\"schema-faq-answer\"><strong>A:<\/strong> Standard lead time is 10\u201316 weeks, depending on custom features and testing requirements.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1744082262889\"><strong class=\"schema-faq-question\">Q3: Can this <a class=\"zinc-link\" href=\"https:\/\/pineele.com\/de\/220-33-kv-transformer-specification-complete-technical-guide\" title=\"transformer\" target=\"_blank\">transformer guide<\/a> be used for solar grid tie applications?<\/strong> <p class=\"schema-faq-answer\"><strong>A:<\/strong> Yes, PINEELE offers solar-compatible units with advanced protection and remote monitoring.<\/p> <\/div> <\/div>\n\n\n\n<p>Die <strong>220\/33 kV power transformer<\/strong> is a cornerstone in modern power infrastructure, serving as the vital link between high-<a href=\"https:\/\/pineele.com\/de\/220-33-kv-transformer-specification-complete-technical-guide\" rel=\"nofollow\" title=\"voltage\" target=\"_blank\">voltage solutions<\/a> transmission and medium-voltage distribution. With advanced insulation, protection, and smart integration options, PINEELE transformers ensure reliable, efficient, and future-ready power conversion.<\/p>\n\n\n\n<p><em>\u201cEmpowering Grids, Enabling Growth \u2014 Engineered by PINEELE.\u201d<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Introduction to 220\/33 kV Power Transformer A 220\/33 kV transformer is a high-voltage step-down power transformer used in transmission substations to reduce voltage from 220 kV to 33 kV for further distribution. These transformers are critical in grid substations, industrial plants, and renewable energy interconnection facilities. At PINEELE, we design and manufacture advanced 220\/33 kV [&hellip;]<\/p>","protected":false},"author":1,"featured_media":591,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[26],"tags":[],"class_list":["post-590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>220\/33 kV Transformer Specification: Complete Technical Guide - PINEELE<\/title>\n<meta name=\"description\" content=\"A 220\/33 kV transformer is a high-voltage step-down power transformer used in transmission substations to reduce voltage from 220 kV to 33 kV for further distribution.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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