{"id":22296,"date":"2025-11-22T02:41:18","date_gmt":"2025-11-22T02:41:18","guid":{"rendered":"https:\/\/www.tronkiele.com\/?p=22296"},"modified":"2025-11-22T02:57:05","modified_gmt":"2025-11-22T02:57:05","slug":"oil-immersed-transformer-structure-and-working-principle","status":"publish","type":"post","link":"https:\/\/www.tronkiele.com\/pt\/oil-immersed-transformer-structure-and-working-principle\/","title":{"rendered":"Estrutura e princ\u00edpio de funcionamento do transformador imerso em \u00f3leo: Um guia t\u00e9cnico completo"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"22296\" class=\"elementor elementor-22296\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"wd-negative-gap elementor-element elementor-element-2d311ce2 e-flex e-con-boxed e-con e-parent\" data-id=\"2d311ce2\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-67d61fb0 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"67d61fb0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\"><p><a href=\"\/product-category\/power-transformer\/oil-transformer\/\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0802ff\" class=\"has-inline-color\">Oil-immersed transformers<\/mark><\/a> play an essential role in today\u2019s power transmission and distribution networks. From utility substations and industrial plants to commercial buildings and rural grid systems, these transformers ensure stable voltage conversion, high reliability, and long service life.<\/p><p>This article provides a clear, professional explanation of the <strong>structure<\/strong> and <strong>working principle<\/strong> of oil-immersed transformers, helping engineers, procurement teams, and end-users better understand their performance and applications.<\/p><h2 class=\"wp-block-heading\"><strong>What Is an Oil-Immersed Transformer?<\/strong><\/h2><p>An <strong>oil-immersed transformer<\/strong> (also called oil transformer) is a type of power or <a href=\"\/product-category\/power-transformer\/\"><mark style=\"background-color:rgba(0, 0, 0, 0);color:#0802ff\" class=\"has-inline-color\">distribution transformer<\/mark><\/a> in which the <strong>core and windings are fully submerged in insulating transformer oil<\/strong>. The oil performs two primary functions:<\/p><ol class=\"wp-block-list\"><li><strong>Insulation:<\/strong> Prevents electrical breakdown between components<\/li>\n\n<li><strong>Cooling:<\/strong> Transfers heat from the windings and core to the tank surface<\/li><\/ol><p>These transformers are used across both <strong>power transmission<\/strong> and <strong>distribution networks<\/strong>, commonly classified as:<\/p><ul class=\"wp-block-list\"><li><strong>Oil Immersed Power Transformer<\/strong> \u2013 for high-voltage, high-capacity applications<\/li>\n\n<li><strong>Oil Immersed Distribution Transformer<\/strong> \u2013 for 10kV\/20kV\/35kV to 230\/400V distribution<\/li><\/ul><p>Their ability to handle large loads, overload conditions, and harsh outdoor environments makes them the backbone of global power infrastructure.<\/p><h2 class=\"wp-block-heading\"><strong>Structural Components of Oil-Immersed Transformers<\/strong><\/h2><p>Although designs vary among manufacturers, a standard oil-immersed transformer typically includes the following components:<\/p><h3 class=\"wp-block-heading\"><strong>1. Core (Magnetic Circuit)<\/strong><\/h3><p>The transformer core is the magnetic pathway that guides alternating magnetic flux. It is usually made of:<\/p><ul class=\"wp-block-list\"><li><strong>Cold-rolled grain-oriented silicon steel laminations<\/strong><\/li>\n\n<li>Thickness commonly less than 0.3 mm<\/li>\n\n<li>Low hysteresis and eddy-current losses<\/li><\/ul><p>Two common structural types exist:<\/p><ul class=\"wp-block-list\"><li><strong>Core-type transformer<\/strong> \u2013 windings surround the core limbs<\/li>\n\n<li><strong>Shell-type transformer<\/strong> \u2013 the core surrounds the windings<\/li><\/ul><p>Most power and distribution transformers today use the core-type structure due to better cooling and mechanical strength.<\/p><p>Large-capacity transformers include <strong>oil ducts<\/strong> inside the core so that circulating oil can efficiently remove heat from the magnetic circuit.<\/p><h3 class=\"wp-block-heading\"><strong>2. Windings (Primary &amp; Secondary Coils)<\/strong><\/h3><p>The windings are responsible for voltage conversion through electromagnetic induction. They are typically made of copper or aluminum conductors, insulated with high-temperature materials.<\/p><p>Common winding structures include:<\/p><ul class=\"wp-block-list\"><li><strong>Concentric windings<\/strong><\/li>\n\n<li><strong>Interleaved or disc windings<\/strong><\/li>\n\n<li><strong>Layered windings for HV and LV coils<\/strong><\/li><\/ul><h3 class=\"wp-block-heading\"><strong>Key considerations for windings:<\/strong><\/h3><ul class=\"wp-block-list\"><li>Must withstand short-circuit mechanical forces<\/li>\n\n<li>Must dissipate heat effectively into transformer oil<\/li>\n\n<li>Require robust insulation to prevent inter-turn and phase-to-ground faults<\/li><\/ul><p>Typical winding failures include:<\/p><ul class=\"wp-block-list\"><li>Inter-turn short circuits (due to insulation aging or overload)<\/li>\n\n<li>Phase-to-ground faults (due to moisture, oil degradation, or overvoltage)<\/li>\n\n<li>Deformation caused by short-circuit current forces<\/li><\/ul><p>Oil circulation helps maintain insulation integrity and dissipates heat generated by the I\u00b2R losses.<\/p><h2 class=\"wp-block-heading\"><strong>3. Transformer Oil &amp; Oil Tank<\/strong><\/h2><p>The <strong>oil tank<\/strong> houses the core and windings and is filled with high-grade mineral transformer oil.<br>The tank performs these functions:<\/p><ul class=\"wp-block-list\"><li>Holds the transformer oil<\/li>\n\n<li>Provides a sealed environment to prevent oxidation<\/li>\n\n<li>Supports the radiator fins for heat dissipation<\/li><\/ul><p>Small- and medium-sized oil immersed transformers typically use:<\/p><ul class=\"wp-block-list\"><li><strong>Sealed oil tanks<\/strong> (hermetically sealed)<\/li>\n\n<li><strong>Corrugated tank walls<\/strong> to allow thermal expansion<\/li>\n\n<li><strong>Radiators or cooling fins<\/strong> for enhanced heat dissipation<\/li><\/ul><p>Larger transformers may include <strong>oil conservators (oil expansion tank)<\/strong> to maintain pressure balance and prevent oil-air contact.<\/p><h3 class=\"wp-block-heading\"><strong>4. Tap Changer<\/strong><\/h3><p>The tap changer is used to adjust the transformer&#8217;s output voltage to match grid fluctuations.<\/p><p>Types include:<\/p><ul class=\"wp-block-list\"><li><strong>Off-load tap changer (OLTC)<\/strong> \u2013 adjusted when transformer is de-energized<\/li>\n\n<li><strong>On-load tap changer (LTC\/OLTC)<\/strong> \u2013 adjusts voltage automatically during operation<\/li><\/ul><p>Tap changers ensure stable secondary voltage even with fluctuating primary grid conditions.<\/p><h3 class=\"wp-block-heading\"><strong>5. Bushings<\/strong><\/h3><p>Bushings provide high-voltage insulation for conductors passing through the transformer tank wall.<\/p><p>Types:<\/p><ul class=\"wp-block-list\"><li>Porcelain bushings<\/li>\n\n<li>Composite bushings<\/li>\n\n<li>Oil-filled bushings for high-voltage applications<\/li><\/ul><p>They must withstand high voltage, environmental stresses, and mechanical loads.<\/p><h3 class=\"wp-block-heading\"><strong>6. Protection &amp; Monitoring Devices<\/strong><\/h3><p>Oil-immersed transformers include various protection mechanisms:<\/p><ul class=\"wp-block-list\"><li><strong>Buchholz relay<\/strong> \u2013 detects gas accumulation from internal faults<\/li>\n\n<li><strong>Pressure relief valve<\/strong> \u2013 releases excess internal pressure<\/li>\n\n<li><strong>Temperature sensors\/thermometers<\/strong> \u2013 monitor oil and winding temperature<\/li>\n\n<li><strong>Oil level indicator<\/strong> \u2013 ensures proper oil volume<\/li>\n\n<li><strong>Breather (silica gel)<\/strong> \u2013 keeps moisture out of the conservator system<\/li><\/ul><p>These devices ensure safe, long-term operation.<\/p><h2 class=\"wp-block-heading\"><strong>Working Principle of Oil-Immersed Transformers<\/strong><\/h2><p>Oil-immersed transformers operate based on the principle of <strong>electromagnetic induction<\/strong>.<\/p><p>Let\u2019s break down the process:<\/p><h3 class=\"wp-block-heading\"><strong>1. Voltage Is Applied to the Primary Winding<\/strong><\/h3><p>When AC voltage is applied to the primary coil, an alternating current flows, generating a magnetic field in the iron core.<\/p><h3 class=\"wp-block-heading\"><strong>2. Magnetic Flux Links to the Secondary Winding<\/strong><\/h3><p>The alternating magnetic flux passes through the core and links both primary and secondary windings.<\/p><p>The induced voltage obeys the transformer EMF equation: E=4.44fN\u03a6max\u200b<\/p><p>Where:<\/p><ul class=\"wp-block-list\"><li><strong>E<\/strong> = induced voltage<\/li>\n\n<li><strong>f<\/strong> = frequency<\/li>\n\n<li><strong>N<\/strong> = number of turns<\/li>\n\n<li><strong>\u03a6max<\/strong> = maximum magnetic flux<\/li><\/ul><p>Different turn ratios create different output voltages.<\/p><h3 class=\"wp-block-heading\"><strong>3. Power Transfer Through Magnetic Coupling<\/strong><\/h3><ul class=\"wp-block-list\"><li>When the secondary side is <strong>open-circuit<\/strong>, only magnetizing current flows in the primary winding.<\/li>\n\n<li>When the secondary is <strong>loaded<\/strong>, current flows in the load, generating opposing flux.<\/li>\n\n<li>The primary winding automatically adjusts its current to maintain magnetic flux equilibrium.<\/li><\/ul><p>This dynamic balance enables energy transfer from primary to secondary without direct electrical contact.<\/p><h3 class=\"wp-block-heading\"><strong>4. Oil Cooling &amp; Insulation<\/strong><\/h3><p>Transformer oil continually circulates due to natural convection or forced oil pumps, performing several vital functions:<\/p><ul class=\"wp-block-list\"><li>Transfers heat from windings and core to the tank wall<\/li>\n\n<li>Enhances insulation strength<\/li>\n\n<li>Prevents moisture ingress<\/li>\n\n<li>Reduces oxidation and thermal degradation<\/li><\/ul><p>This oil-based cooling allows oil-immersed transformers to handle much higher capacities than dry-type transformers.<\/p><h2 class=\"wp-block-heading\"><strong>Advantages of Oil-Immersed Transformers<\/strong><\/h2><h3 class=\"wp-block-heading\"><strong>1. Excellent Cooling Capability<\/strong><\/h3><p>Oil provides superior heat dissipation, allowing higher load capacity and longer life.<\/p><h3 class=\"wp-block-heading\"><strong>2. High Electrical Strength<\/strong><\/h3><p>Transformer oil significantly enhances insulation strength between components.<\/p><h3 class=\"wp-block-heading\"><strong>3. Long Service Life<\/strong><\/h3><p>Properly maintained oil-immersed transformers often exceed <strong>25\u201335 years<\/strong> of operation.<\/p><h3 class=\"wp-block-heading\"><strong>4. Suitable for Outdoor Installation<\/strong><\/h3><p>They perform reliably under harsh weather conditions.<\/p><h3 class=\"wp-block-heading\"><strong>5. Strong Overload Handling<\/strong><\/h3><p>Oil cooling enables transformers to withstand temporary overloads without severe insulation damage.<\/p><h2 class=\"wp-block-heading\"><strong>Applications of Oil-Immersed Transformers<\/strong><\/h2><p>Oil-immersed transformers are widely used in:<\/p><ul class=\"wp-block-list\"><li>Utility substations<\/li>\n\n<li>Industrial manufacturing plants<\/li>\n\n<li>Mining operations<\/li>\n\n<li>Rural and urban distribution networks<\/li>\n\n<li>Renewable energy projects<\/li>\n\n<li>Commercial and residential power systems<\/li><\/ul><h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2><p>Oil-immersed transformers remain the preferred choice for global power distribution thanks to their robust structure, high thermal performance, and long-term reliability. Understanding their components and working principles helps users make informed decisions in procurement, operation, and maintenance.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8494d19 elementor-widget elementor-widget-wd_text_block\" data-id=\"8494d19\" data-element_type=\"widget\" data-widget_type=\"wd_text_block.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"wd-text-block reset-last-child text-left\">\n\t\t\t\n\t\t\t<h2>Related Products<\/h2>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2fbaf5e wd-width-100 elementor-widget elementor-widget-wd_products\" data-id=\"2fbaf5e\" data-element_type=\"widget\" data-widget_type=\"wd_products.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"wd-products-element\">\n\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\t<div class=\"products wd-products 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data-source=\"shortcode\" data-columns=\"4\" data-grid-gallery=\"\" style=\"--wd-col-lg:4;--wd-col-md:4;--wd-col-sm:2;--wd-gap-lg:20px;--wd-gap-sm:10px;\">\n\t\t\n\t\t\t\t\t\t\t\t<div class=\"wd-product wd-with-labels wd-hover-base wd-hover-with-fade wd-col product-grid-item product product-no-swatches type-product post-2608 status-publish instock product_cat-oil-transformer product_cat-power-transformer has-post-thumbnail featured taxable shipping-taxable product-type-simple\" data-loop=\"1\" data-id=\"2608\">\n\t\n\t\n<div class=\"product-wrapper\">\n\t<div class=\"content-product-imagin\"><\/div>\n\t<div class=\"product-element-top wd-quick-shop\">\n\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product\/11kv-to-0-4kv-800kva-distribution-step-up-transformers\/\" class=\"product-image-link\">\n\t\t\t<div class=\"product-labels labels-rounded\"><span class=\"featured product-label\">Hot<\/span><\/div><img fetchpriority=\"high\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/11kV-To-0.4kV-800kVA-Distribution-Step-Up-Transformers.webp\" class=\"attachment-large size-large\" alt=\"11kV To 0.4kV 800kVA Distribution Step Up Transformers\" srcset=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/11kV-To-0.4kV-800kVA-Distribution-Step-Up-Transformers.webp 600w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/11kV-To-0.4kV-800kVA-Distribution-Step-Up-Transformers-300x300.webp 300w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/11kV-To-0.4kV-800kVA-Distribution-Step-Up-Transformers-150x150.webp 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t<\/a>\n\n\t\t\n\t\t<div class=\"wrapp-swatches\"><\/div>\n\n\t<\/div>\n\n\t<div class=\"product-element-bottom product-information\">\n\t\t<h3 class=\"wd-entities-title\"><a href=\"https:\/\/www.tronkiele.com\/pt\/product\/11kv-to-0-4kv-800kva-distribution-step-up-transformers\/\">11kV To 0.4kV 800kVA Distribution Step Up Transformers<\/a><\/h3>\t\t\t\t<div class=\"wd-product-cats\">\n\t\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/\" rel=\"tag\">Power Transformer<\/a>, <a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/oil-transformer\/\" rel=\"tag\">Oil Immersed Distribution Transformer<\/a>\t\t<\/div>\n\t\t\t\t<div class=\"product-rating-price\">\n\t\t\t<div class=\"wrapp-product-price\">\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"fade-in-block wd-scroll\">\n\t\t\t<div class=\"hover-content wd-more-desc\">\n\t\t\t\t<div class=\"hover-content-inner wd-more-desc-inner\">\n\t\t\t\t\tMore than 20 years, professional supplier of all types of transformers from 30 kVA up to 2500 kVA. Its technology is at the required standard for most European and American markets, while also looking forward to being your reliable long-term partner in China\t\t\t\t<\/div>\n\t\t\t\t<a href=\"#\" rel=\"nofollow\" class=\"wd-more-desc-btn\" aria-label=\"Read more description\"><span><\/span><\/a>\n\t\t\t<\/div>\n\t\t\t<div class=\" wd-bottom-actions\">\n\t\t\t\t<div class=\"wrap-wishlist-button\"><\/div>\n\t\t\t\t<div class=\"wd-add-btn wd-add-btn-replace\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"wrap-quickview-button\">\t\t<div class=\"quick-view wd-action-btn wd-style-icon wd-quick-view-icon\">\n\t\t\t<a\n\t\t\t\thref=\"https:\/\/www.tronkiele.com\/pt\/product\/11kv-to-0-4kv-800kva-distribution-step-up-transformers\/\"\n\t\t\t\tclass=\"open-quick-view quick-view-button\"\n\t\t\t\trel=\"nofollow\"\n\t\t\t\tdata-id=\"2608\"\n\t\t\t\t>Quick view<\/a>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\n\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<div class=\"wd-product wd-hover-base wd-hover-with-fade wd-col product-grid-item product product-no-swatches type-product post-2601 status-publish last instock product_cat-oil-transformer product_cat-power-transformer has-post-thumbnail taxable shipping-taxable product-type-simple\" data-loop=\"2\" data-id=\"2601\">\n\t\n\t\n<div class=\"product-wrapper\">\n\t<div class=\"content-product-imagin\"><\/div>\n\t<div class=\"product-element-top wd-quick-shop\">\n\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product\/s11-s13-250kva-11kv-3-phase-distribution-power-transformer\/\" class=\"product-image-link\">\n\t\t\t<img decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/S11-S13-250KVA-11kV-Distribution-Power-Transformer.webp\" class=\"attachment-large size-large\" alt=\"S11-S13 250KVA 11kV Distribution Power Transformer\" srcset=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/S11-S13-250KVA-11kV-Distribution-Power-Transformer.webp 600w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/S11-S13-250KVA-11kV-Distribution-Power-Transformer-300x300.webp 300w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/S11-S13-250KVA-11kV-Distribution-Power-Transformer-150x150.webp 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t<\/a>\n\n\t\t\n\t\t<div class=\"wrapp-swatches\"><\/div>\n\n\t<\/div>\n\n\t<div class=\"product-element-bottom product-information\">\n\t\t<h3 class=\"wd-entities-title\"><a href=\"https:\/\/www.tronkiele.com\/pt\/product\/s11-s13-250kva-11kv-3-phase-distribution-power-transformer\/\">S11-S13 250KVA 11kV 3 Phase Distribution Power Transformer<\/a><\/h3>\t\t\t\t<div class=\"wd-product-cats\">\n\t\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/\" rel=\"tag\">Power Transformer<\/a>, <a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/oil-transformer\/\" rel=\"tag\">Oil Immersed Distribution Transformer<\/a>\t\t<\/div>\n\t\t\t\t<div class=\"product-rating-price\">\n\t\t\t<div class=\"wrapp-product-price\">\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"fade-in-block wd-scroll\">\n\t\t\t<div class=\"hover-content wd-more-desc\">\n\t\t\t\t<div class=\"hover-content-inner wd-more-desc-inner\">\n\t\t\t\t\tTRONKI Electric provides a serial of reliable <a href=\"https:\/\/www.zx-ele.com\/category\/transformer\/oil-transformer\/\"><span style=\"color: #0000ff;\">oil-immersed distribution transformers<\/span><\/a> for both industrial and civil use. They are suitable for outdoor and indoor use and work effectively under the temperatures from -25\u00b0C to 40\u00b0C, stepping down high-voltage grid supply (such as 11 kV, 10.5 kV, 10 kV, 6.3 kV, 6 kV) into 400V in safety for home and business usages.\t\t\t\t<\/div>\n\t\t\t\t<a href=\"#\" rel=\"nofollow\" class=\"wd-more-desc-btn\" aria-label=\"Read more description\"><span><\/span><\/a>\n\t\t\t<\/div>\n\t\t\t<div class=\" wd-bottom-actions\">\n\t\t\t\t<div class=\"wrap-wishlist-button\"><\/div>\n\t\t\t\t<div class=\"wd-add-btn wd-add-btn-replace\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"wrap-quickview-button\">\t\t<div class=\"quick-view wd-action-btn wd-style-icon wd-quick-view-icon\">\n\t\t\t<a\n\t\t\t\thref=\"https:\/\/www.tronkiele.com\/pt\/product\/s11-s13-250kva-11kv-3-phase-distribution-power-transformer\/\"\n\t\t\t\tclass=\"open-quick-view quick-view-button\"\n\t\t\t\trel=\"nofollow\"\n\t\t\t\tdata-id=\"2601\"\n\t\t\t\t>Quick view<\/a>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\n\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<div class=\"wd-product wd-with-labels wd-hover-base wd-hover-with-fade wd-col product-grid-item product product-no-swatches type-product post-2597 status-publish first instock product_cat-oil-transformer product_cat-power-transformer has-post-thumbnail featured taxable shipping-taxable product-type-simple\" data-loop=\"3\" data-id=\"2597\">\n\t\n\t\n<div class=\"product-wrapper\">\n\t<div class=\"content-product-imagin\"><\/div>\n\t<div class=\"product-element-top wd-quick-shop\">\n\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product\/sz11-35kv-oil-immersed-substation-ac-transformer\/\" class=\"product-image-link\">\n\t\t\t<div class=\"product-labels labels-rounded\"><span class=\"featured product-label\">Hot<\/span><\/div><img decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/SZ11-35KV-Oil-Immersed-Substation-AC-Transformer.webp\" class=\"attachment-large size-large\" alt=\"SZ11-35KV Oil-Immersed Substation AC Transformer\" srcset=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/SZ11-35KV-Oil-Immersed-Substation-AC-Transformer.webp 600w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/SZ11-35KV-Oil-Immersed-Substation-AC-Transformer-300x300.webp 300w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/SZ11-35KV-Oil-Immersed-Substation-AC-Transformer-150x150.webp 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t<\/a>\n\n\t\t\n\t\t<div class=\"wrapp-swatches\"><\/div>\n\n\t<\/div>\n\n\t<div class=\"product-element-bottom product-information\">\n\t\t<h3 class=\"wd-entities-title\"><a href=\"https:\/\/www.tronkiele.com\/pt\/product\/sz11-35kv-oil-immersed-substation-ac-transformer\/\">SZ11-35KV Oil-Immersed Substation AC Transformer<\/a><\/h3>\t\t\t\t<div class=\"wd-product-cats\">\n\t\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/\" rel=\"tag\">Power Transformer<\/a>, <a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/oil-transformer\/\" rel=\"tag\">Oil Immersed Distribution Transformer<\/a>\t\t<\/div>\n\t\t\t\t<div class=\"product-rating-price\">\n\t\t\t<div class=\"wrapp-product-price\">\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"fade-in-block wd-scroll\">\n\t\t\t<div class=\"hover-content wd-more-desc\">\n\t\t\t\t<div class=\"hover-content-inner wd-more-desc-inner\">\n\t\t\t\t\tThe 800~31500\/35 oil-immersed transformer is used for 35kV AC 50Hz power systems, which can be applied to small and medium-sized substations. It offers reliable and efficient performance, meeting the needs of power transmission and distribution.\t\t\t\t<\/div>\n\t\t\t\t<a href=\"#\" rel=\"nofollow\" class=\"wd-more-desc-btn\" aria-label=\"Read more description\"><span><\/span><\/a>\n\t\t\t<\/div>\n\t\t\t<div class=\" wd-bottom-actions\">\n\t\t\t\t<div class=\"wrap-wishlist-button\"><\/div>\n\t\t\t\t<div class=\"wd-add-btn wd-add-btn-replace\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"wrap-quickview-button\">\t\t<div class=\"quick-view wd-action-btn wd-style-icon wd-quick-view-icon\">\n\t\t\t<a\n\t\t\t\thref=\"https:\/\/www.tronkiele.com\/pt\/product\/sz11-35kv-oil-immersed-substation-ac-transformer\/\"\n\t\t\t\tclass=\"open-quick-view quick-view-button\"\n\t\t\t\trel=\"nofollow\"\n\t\t\t\tdata-id=\"2597\"\n\t\t\t\t>Quick view<\/a>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\n\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n<\/div>\n\t\t\t\t\t\t\t\t<div class=\"wd-product wd-with-labels wd-hover-base wd-hover-with-fade wd-col product-grid-item product product-no-swatches type-product post-2588 status-publish instock product_cat-oil-transformer product_cat-power-transformer has-post-thumbnail featured taxable shipping-taxable product-type-simple\" data-loop=\"4\" data-id=\"2588\">\n\t\n\t\n<div class=\"product-wrapper\">\n\t<div class=\"content-product-imagin\"><\/div>\n\t<div class=\"product-element-top wd-quick-shop\">\n\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product\/630kva-3-phase-distribution-power-grounding-oil-immersed-transformer\/\" class=\"product-image-link\">\n\t\t\t<div class=\"product-labels labels-rounded\"><span class=\"featured product-label\">Hot<\/span><\/div><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"600\" src=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/630kVA-3-Phase-Distribution-Power-Transformer.webp\" class=\"attachment-large size-large\" alt=\"630kVA 3 Phase Distribution Power Transformer\" srcset=\"https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/630kVA-3-Phase-Distribution-Power-Transformer.webp 600w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/630kVA-3-Phase-Distribution-Power-Transformer-300x300.webp 300w, https:\/\/www.tronkiele.com\/wp-content\/uploads\/2024\/11\/630kVA-3-Phase-Distribution-Power-Transformer-150x150.webp 150w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/>\t\t<\/a>\n\n\t\t\n\t\t<div class=\"wrapp-swatches\"><\/div>\n\n\t<\/div>\n\n\t<div class=\"product-element-bottom product-information\">\n\t\t<h3 class=\"wd-entities-title\"><a href=\"https:\/\/www.tronkiele.com\/pt\/product\/630kva-3-phase-distribution-power-grounding-oil-immersed-transformer\/\">630kVA 3 Phase Distribution Power Grounding Oil Immersed  Transformer<\/a><\/h3>\t\t\t\t<div class=\"wd-product-cats\">\n\t\t\t<a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/\" rel=\"tag\">Power Transformer<\/a>, <a href=\"https:\/\/www.tronkiele.com\/pt\/product-category\/power-transformer\/oil-transformer\/\" rel=\"tag\">Oil Immersed Distribution Transformer<\/a>\t\t<\/div>\n\t\t\t\t<div class=\"product-rating-price\">\n\t\t\t<div class=\"wrapp-product-price\">\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"fade-in-block wd-scroll\">\n\t\t\t<div class=\"hover-content wd-more-desc\">\n\t\t\t\t<div class=\"hover-content-inner wd-more-desc-inner\">\n\t\t\t\t\tScope of Supply Product: Oil-immersed Power Transformer Rated Power: Up to 200 MVA Primary Voltage: Up to 230 kV\t\t\t\t<\/div>\n\t\t\t\t<a href=\"#\" rel=\"nofollow\" class=\"wd-more-desc-btn\" aria-label=\"Read more description\"><span><\/span><\/a>\n\t\t\t<\/div>\n\t\t\t<div class=\" wd-bottom-actions\">\n\t\t\t\t<div class=\"wrap-wishlist-button\"><\/div>\n\t\t\t\t<div class=\"wd-add-btn wd-add-btn-replace\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"wrap-quickview-button\">\t\t<div class=\"quick-view wd-action-btn wd-style-icon wd-quick-view-icon\">\n\t\t\t<a\n\t\t\t\thref=\"https:\/\/www.tronkiele.com\/pt\/product\/630kva-3-phase-distribution-power-grounding-oil-immersed-transformer\/\"\n\t\t\t\tclass=\"open-quick-view quick-view-button\"\n\t\t\t\trel=\"nofollow\"\n\t\t\t\tdata-id=\"2588\"\n\t\t\t\t>Quick view<\/a>\n\t\t<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\n\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t<\/div>\n<\/div>\n<\/div>\n\t\t\n\t\t\t\t<\/div>\n\t\n\t\t\n\t\t\n\t\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Oil-immersed transformers play an essential role in today\u2019s power transmission and distribution networks. From utility substations and industrial plants to<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[93],"tags":[],"class_list":["post-22296","post","type-post","status-publish","format-standard","hentry","category-transformer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Oil-Immersed Transformer Structure and Working Principle: A Complete Technical Guide - PINE-ZHENGXI<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tronkiele.com\/pt\/oil-immersed-transformer-structure-and-working-principle\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oil-Immersed Transformer Structure and Working Principle: A Complete Technical Guide - PINE-ZHENGXI\" \/>\n<meta property=\"og:description\" content=\"Oil-immersed transformers play an essential role in today\u2019s power transmission and distribution networks. 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