{"id":37687,"date":"2026-07-20T10:38:54","date_gmt":"2026-07-20T10:38:54","guid":{"rendered":"https:\/\/dinghongtransformer.com\/?p=37687"},"modified":"2026-07-21T02:49:08","modified_gmt":"2026-07-21T02:49:08","slug":"how-does-a-transformer-work","status":"publish","type":"post","link":"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/","title":{"rendered":"Comment fonctionne un transformateur ? Un guide pratique que tout acheteur d'\u00e9quipement \u00e9lectrique devrait lire"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-da38b71b\">Whether electricity is transmitted across a national grid or distributed inside a factory, data center, hospital, or renewable energy project, transformers play a critical role in ensuring safe and efficient power delivery.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fb38d133\">Although transformers are widely used, many buyers still believe they simply &#8220;increase or decrease voltage.&#8221; In reality, transformer performance depends on electromagnetic induction, winding design, insulation, cooling methods, and operating conditions. Understanding these fundamentals can help engineers, EPC contractors, and procurement teams choose the right transformer and avoid costly specification errors.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#1_What_Is_a_Transformer\" >1. What Is a Transformer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#2_The_Basic_Working_Principle\" >2. The Basic Working Principle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#3_Why_Transformers_Only_Work_with_AC\" >3. Why Transformers Only Work with AC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#4_Main_Components_of_a_Transformer\" >4. Main Components of a Transformer<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Magnetic_Core\" >Magnetic Core<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Primary_Winding\" >Primary Winding<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Secondary_Winding\" >Secondary Winding<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Insulation_System\" >Insulation System<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Cooling_System\" >Cooling System<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#5_Step-Up_vs_Step-Down_Transformers\" >5. Step-Up vs Step-Down Transformers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#6_Dry-Type_vs_Oil-Immersed_Transformers\" >6. Dry-Type vs Oil-Immersed Transformers<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Dry-Type_Transformers\" >Dry-Type Transformers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Oil-Immersed_Transformers\" >Oil-Immersed Transformers<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#7_Hidden_Facts_Buyers_Often_Overlook\" >7. Hidden Facts Buyers Often Overlook<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Capacity_Is_Not_the_Only_Selection_Factor\" >Capacity Is Not the Only Selection Factor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Lower_Purchase_Price_Does_Not_Mean_Lower_Lifetime_Cost\" >Lower Purchase Price Does Not Mean Lower Lifetime Cost<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Installation_Environment_Matters\" >Installation Environment Matters<\/a><\/li><\/ul><\/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\/fr\/blog\/how-does-a-transformer-work\/#8_Why_Factory_Testing_Is_Important\" >8. Why Factory Testing Is Important<\/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\/fr\/blog\/how-does-a-transformer-work\/#Choosing_the_Right_Transformer\" >Choosing the Right Transformer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#1_How_does_a_transformer_work\" >1. How does a transformer work?<\/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\/fr\/blog\/how-does-a-transformer-work\/#2_Why_do_transformers_only_work_with_AC\" >2. Why do transformers only work with AC?<\/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\/fr\/blog\/how-does-a-transformer-work\/#3_What_is_the_difference_between_a_step-up_and_step-down_transformer\" >3. What is the difference between a step-up and step-down transformer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#4_What_is_the_difference_between_dry-type_and_oil-immersed_transformers\" >4. What is the difference between dry-type and oil-immersed transformers?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#5_What_information_is_needed_when_selecting_a_transformer\" >5. What information is needed when selecting a transformer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/how-does-a-transformer-work\/#6_Why_is_transformer_efficiency_important\" >6. Why is transformer efficiency important?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-wd-title title wd-b6daddb8\"><span class=\"ez-toc-section\" id=\"1_What_Is_a_Transformer\"><\/span>1. <a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/inudustry-trends\/electrical-transformer-how-does-it-work-a-practical-guide-for-power-project-buyers\/\" data-type=\"post\" data-id=\"37663\">What Is a Transformer<\/a>?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d077e002\">A transformer is a static electrical device that transfers alternating current (AC) electrical energy from one circuit to another through electromagnetic induction. It changes voltage levels while maintaining the same operating frequency.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-523cd52d\">Transformers are commonly used in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utility substations<\/li>\n\n\n\n<li>Industrial plants<\/li>\n\n\n\n<li>Commercial buildings<\/li>\n\n\n\n<li>Renewable energy projects<\/li>\n\n\n\n<li>Data centers<\/li>\n\n\n\n<li>Mining operations<\/li>\n\n\n\n<li>Rail transportation<\/li>\n\n\n\n<li>Wind and solar power systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1b9ef2bd\">Without transformers, long-distance power transmission would be highly inefficient because low-voltage electricity requires much higher current, resulting in significant power losses.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-455bc8dc\"><span class=\"ez-toc-section\" id=\"2_The_Basic_Working_Principle\"><\/span>2. The Basic Working Principle<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-19401458\">A transformer works according to <strong>Faraday&#8217;s Law of Electromagnetic Induction<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-efa8a472\">When alternating current flows through the primary winding, it creates a continuously changing magnetic field inside the laminated steel core.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2897d6ca\">This changing magnetic flux links the secondary winding and induces a voltage.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-87b84e45\">Because the magnetic field changes continuously, electrical energy is transferred without a direct electrical connection between the two windings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6310c3ce\">The output voltage depends primarily on the turns ratio between the primary and secondary windings.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>More secondary turns = Higher output voltage (Step-Up Transformer)<\/li>\n\n\n\n<li>Fewer secondary turns = Lower output voltage (Step-Down Transformer)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ddab61b2\">Although voltage changes, frequency remains the same.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ae9e363c\">This simple principle has been used in power systems for more than a century and remains the foundation of modern electrical transmission.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d3d6ebbf\"><span class=\"ez-toc-section\" id=\"3_Why_Transformers_Only_Work_with_AC\"><\/span>3. Why Transformers Only Work with AC<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c60728bc\">One of the most misunderstood topics is why transformers require alternating current.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bc7f73f9\">Alternating current continuously changes direction, producing a varying magnetic field inside the transformer core.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-25921e27\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/produit\/dc-ev-charging-pile\/\" data-type=\"product\" data-id=\"37501\">Direct current (DC)<\/a>, however, becomes constant after energization. Without a changing magnetic field, the secondary winding cannot continuously generate voltage.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8863b146\">Applying DC to a conventional <a href=\"https:\/\/dinghongtransformer.com\/fr\/produit\/ac-ev-charging-pile\/\" data-type=\"product\" data-id=\"37497\">AC transformer<\/a> can quickly cause excessive current, overheating, insulation failure, and permanent damage.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-80af3efb\">This is why standard power transformers are designed specifically for AC systems operating at frequencies such as 50Hz or 60Hz.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-0fdfd00e\"><span class=\"ez-toc-section\" id=\"4_Main_Components_of_a_Transformer\"><\/span>4. Main Components of a Transformer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7d443857\">Although transformer designs vary, most units contain the following key components:<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-4ac65c2e\"><span class=\"ez-toc-section\" id=\"Magnetic_Core\"><\/span>Magnetic Core<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-95793d4f\">The laminated steel core provides a low-resistance path for magnetic flux and helps improve efficiency while reducing eddy current losses.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-6d922f41\"><span class=\"ez-toc-section\" id=\"Primary_Winding\"><\/span>Primary Winding<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-eaedde9b\">Receives electrical energy from the incoming power supply.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-8ab946f3\"><span class=\"ez-toc-section\" id=\"Secondary_Winding\"><\/span>Secondary Winding<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ad11c326\">Supplies electrical energy to the connected load after voltage transformation.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-e5d26874\"><span class=\"ez-toc-section\" id=\"Insulation_System\"><\/span>Insulation System<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-76d5ea4e\">High-quality insulation prevents electrical breakdown between windings and ensures long-term reliability.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-3092d8fb\"><span class=\"ez-toc-section\" id=\"Cooling_System\"><\/span>Cooling System<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-763f8c21\">Depending on transformer type, cooling may use natural air, forced air, insulating oil, radiators, cooling fans, or other methods.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-1f9cbe5e\"><span class=\"ez-toc-section\" id=\"5_Step-Up_vs_Step-Down_Transformers\"><\/span>5. Step-Up vs Step-Down Transformers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-71678d70\">A <strong>step-up transformer<\/strong> increases voltage and reduces current.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d6e75f5d\">Typical applications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Power plants<\/li>\n\n\n\n<li>Wind farms<\/li>\n\n\n\n<li>Solar power stations<\/li>\n\n\n\n<li>Generator step-up substations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-68021924\">Higher transmission voltage reduces line losses over long distances.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-37a7a320\">A <strong>step-down transformer<\/strong> decreases voltage for safe distribution.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d7480ba3\">Typical applications include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Industrial factories<\/li>\n\n\n\n<li>Commercial buildings<\/li>\n\n\n\n<li>Residential power systems<\/li>\n\n\n\n<li>Data centers<\/li>\n\n\n\n<li>Manufacturing facilities<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c3965338\">For example, electricity generated by a wind turbine may be increased to 33kV or 38.5kV before entering the collection network, then reduced again before supplying end users.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-f0acb96e\"><span class=\"ez-toc-section\" id=\"6_Dry-Type_vs_Oil-Immersed_Transformers\"><\/span>6. Dry-Type vs Oil-Immersed Transformers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2c2467e0\">The working principle is identical, but the insulation and cooling methods differ.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-e1634d5b\"><span class=\"ez-toc-section\" id=\"Dry-Type_Transformers\"><\/span><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/how-to-select-a-33-38-5kv-dry-type-transformer-for-a-wind-power-project-7-critical-factors-beyond-capacity\/\" data-type=\"post\" data-id=\"37596\">Dry-Type Transformers<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-35afe984\">Dry-type transformers use solid insulation materials such as cast resin instead of insulating oil.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-02274b03\">Advantages include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No oil leakage<\/li>\n\n\n\n<li>Reduced fire risk<\/li>\n\n\n\n<li>Low maintenance<\/li>\n\n\n\n<li>Suitable for indoor installation<\/li>\n\n\n\n<li>Ideal for hospitals, airports, metro stations, schools, commercial buildings, and data centers<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-0059ba17\"><span class=\"ez-toc-section\" id=\"Oil-Immersed_Transformers\"><\/span><a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/product-insights\/dry-type-transformer-vs-oil-immersed-transformer-7-key-differences-buyers-should-know\/\" data-type=\"post\" data-id=\"37591\">Oil-Immersed Transformers<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-59552aef\">Oil-immersed transformers use insulating oil for both electrical insulation and heat dissipation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-138af3d2\">Advantages include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Excellent cooling performance<\/li>\n\n\n\n<li>Higher power capacity<\/li>\n\n\n\n<li>Lower initial equipment cost<\/li>\n\n\n\n<li>Suitable for outdoor substations and utility networks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a9d0cba1\"><strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/\">DHDL manufactures<\/a><\/strong> both dry-type and oil-immersed transformers, covering distribution transformers, power transformers, ultra-high-voltage transformers, compact substations, and customized solutions for industrial and renewable energy applications.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a6377b49\"><\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-e2fd5746\"><img decoding=\"async\" width=\"622\" height=\"416\" class=\"wp-image-37356 lazyload\" data-src=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/DHDL-refining-furnace-transformer-for-Inner-Mongolia-special-steel-project.png\" alt=\"\" data-srcset=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/DHDL-refining-furnace-transformer-for-Inner-Mongolia-special-steel-project.png 622w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/DHDL-refining-furnace-transformer-for-Inner-Mongolia-special-steel-project-400x268.png 400w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/DHDL-refining-furnace-transformer-for-Inner-Mongolia-special-steel-project-430x288.png 430w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/DHDL-refining-furnace-transformer-for-Inner-Mongolia-special-steel-project-150x100.png 150w\" data-sizes=\"(max-width: 622px) 100vw, 622px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 622px; --smush-placeholder-aspect-ratio: 622\/416;\" \/><\/div>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ae738d71\"><span class=\"ez-toc-section\" id=\"7_Hidden_Facts_Buyers_Often_Overlook\"><\/span>7. Hidden Facts Buyers Often Overlook<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-e1b56a37\"><span class=\"ez-toc-section\" id=\"Capacity_Is_Not_the_Only_Selection_Factor\"><\/span>Capacity Is Not the Only Selection Factor<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-48df512d\">Many buyers request only the transformer capacity.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-db091312\">However, a complete quotation also requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Primary voltage<\/li>\n\n\n\n<li>Secondary voltage<\/li>\n\n\n\n<li>Fr\u00e9quence<\/li>\n\n\n\n<li>Vector group<\/li>\n\n\n\n<li>Short-circuit impedance<\/li>\n\n\n\n<li>Cooling method<\/li>\n\n\n\n<li>Installation environment<\/li>\n\n\n\n<li>Applicable standards<\/li>\n\n\n\n<li>Altitude<\/li>\n\n\n\n<li>Ambient temperature<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e22e12ff\">Without these details, quotations may not accurately reflect project requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f90a4dda\"><span class=\"ez-toc-section\" id=\"Lower_Purchase_Price_Does_Not_Mean_Lower_Lifetime_Cost\"><\/span>Lower Purchase Price Does Not Mean Lower Lifetime Cost<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a34e471e\">A transformer operates continuously for many years.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ee8a40c1\">Even small differences in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No-load loss<\/li>\n\n\n\n<li>Load loss<\/li>\n\n\n\n<li>Cooling efficiency<\/li>\n\n\n\n<li>Maintenance requirements<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b8739d7d\">can significantly affect the total operating cost over its service life.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-8cbe8175\"><span class=\"ez-toc-section\" id=\"Installation_Environment_Matters\"><\/span>Installation Environment Matters<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5825d75c\">A transformer designed for an indoor factory may not perform well in a coastal wind farm or desert environment.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2ff46bbc\">High humidity, dust, salt spray, vibration, and high altitude all influence transformer design, insulation coordination, enclosure protection, and cooling performance.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-a9862a2e\"><span class=\"ez-toc-section\" id=\"8_Why_Factory_Testing_Is_Important\"><\/span>8. Why Factory Testing Is Important<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c29b5dd0\">Before shipment, transformers should undergo comprehensive routine testing to verify electrical performance.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c9e670d7\">Typical factory tests include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Turns ratio verification<\/li>\n\n\n\n<li>Winding resistance measurement<\/li>\n\n\n\n<li>Insulation resistance test<\/li>\n\n\n\n<li>No-load loss test<\/li>\n\n\n\n<li>Load loss test<\/li>\n\n\n\n<li>Impedance measurement<\/li>\n\n\n\n<li>Applied voltage test<\/li>\n\n\n\n<li>Induced voltage test<\/li>\n\n\n\n<li>Partial discharge test (where required)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-11350f2f\">Reliable manufacturers also perform strict quality control throughout core assembly, winding production, insulation drying, final assembly, and factory acceptance testing.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d7919c45\"><span class=\"ez-toc-section\" id=\"Choosing_the_Right_Transformer\"><\/span>Choosing the Right Transformer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-372e157f\">When selecting a transformer, buyers should consider more than voltage and capacity.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-41bf1dd3\">Important questions include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Indoor or outdoor installation?<\/li>\n\n\n\n<li>Dry-type or oil-immersed?<\/li>\n\n\n\n<li>Natural cooling or forced cooling?<\/li>\n\n\n\n<li>IEC or ANSI standard?<\/li>\n\n\n\n<li>Copper or aluminum windings?<\/li>\n\n\n\n<li>Future capacity expansion?<\/li>\n\n\n\n<li>Renewable energy application?<\/li>\n\n\n\n<li>Harmonic loads?<\/li>\n\n\n\n<li>High-altitude installation?<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-61e48dd8\">Providing complete project information helps manufacturers recommend the most suitable transformer while reducing project delays and unexpected costs.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-da80d827\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4011894c\">A transformer works by transferring electrical energy between two windings through electromagnetic induction. While the principle is straightforward, selecting the right transformer requires careful consideration of voltage, capacity, cooling, insulation, losses, environmental conditions, and industry standards.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d2deaae6\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/\"><strong>DHDL provides customized transformer<\/strong><\/a> solutions for power utilities, industrial facilities, renewable energy projects, infrastructure, and commercial buildings. Whether you need a dry-type transformer, oil-immersed transformer, power transformer, or complete substation solution, our engineering team can recommend the right configuration based on your project requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d7df07ed\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ab450b15\"><span class=\"ez-toc-section\" id=\"1_How_does_a_transformer_work\"><\/span>1. How does a transformer work?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9c2bf99d\">A transformer transfers electrical energy through electromagnetic induction. Alternating current in the primary winding creates a changing magnetic field, which induces voltage in the secondary winding.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-1b20bf42\"><span class=\"ez-toc-section\" id=\"2_Why_do_transformers_only_work_with_AC\"><\/span>2. Why do transformers only work with AC?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-197b9a2b\">Transformers require a changing magnetic field to induce voltage. AC continuously changes direction, while DC does not, making standard transformers unsuitable for direct DC operation.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-b1182f15\"><span class=\"ez-toc-section\" id=\"3_What_is_the_difference_between_a_step-up_and_step-down_transformer\"><\/span>3. What is the difference between a step-up and step-down transformer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-226d3ed6\">A step-up transformer increases voltage for efficient power transmission, while a step-down transformer reduces voltage for safe power distribution to equipment and buildings.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-c47a632b\"><span class=\"ez-toc-section\" id=\"4_What_is_the_difference_between_dry-type_and_oil-immersed_transformers\"><\/span>4. What is the difference between <a href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/product-insights\/dry-type-transformer-vs-oil-immersed-transformer-7-key-differences-buyers-should-know\/\" data-type=\"post\" data-id=\"37591\">dry-type and oil-immersed<\/a> transformers?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1846a75d\">Dry-type transformers use solid insulation and air cooling, making them ideal for indoor installations. Oil-immersed transformers use insulating oil for cooling and are commonly used in outdoor utility and industrial applications.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-fb6c4c19\"><span class=\"ez-toc-section\" id=\"5_What_information_is_needed_when_selecting_a_transformer\"><\/span>5. What information is needed when selecting a transformer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cbe9733b\">Key information includes capacity, primary and secondary voltage, frequency, vector group, impedance, cooling method, installation environment, altitude, applicable standards, and project application.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-a2434b0d\"><span class=\"ez-toc-section\" id=\"6_Why_is_transformer_efficiency_important\"><\/span>6. Why is transformer efficiency important?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-199e7384\">Higher-efficiency transformers reduce no-load and load losses, lowering energy consumption and operating costs throughout the transformer&#8217;s service life.<\/p>\n\n\n\n<div class=\"wp-block-wd-image wd-block-image wd-d98fa96a\"><img decoding=\"async\" width=\"1125\" height=\"627\" class=\"wp-image-37648 lazyload\" data-src=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385.jpg\" alt=\"\" data-srcset=\"https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385.jpg 1125w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385-400x223.jpg 400w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385-768x428.jpg 768w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385-430x240.jpg 430w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385-700x390.jpg 700w, https:\/\/dinghongtransformer.com\/wp-content\/uploads\/2026\/07\/\u6d4b\u8bd5\u5927\u5385-150x84.jpg 150w\" data-sizes=\"(max-width: 1125px) 100vw, 1125px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1125px; --smush-placeholder-aspect-ratio: 1125\/627;\" \/><\/div>","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez le fonctionnement d'un transformateur, notamment l'induction \u00e9lectromagn\u00e9tique, les composants du transformateur, les transformateurs \u00e9l\u00e9vateurs et abaisseurs, les conceptions de type sec ou immerg\u00e9es dans l'huile, ainsi que des conseils pratiques de s\u00e9lection pour les projets industriels et d'\u00e9nergies renouvelables.<\/p>","protected":false},"author":1,"featured_media":37688,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,71,102,73],"tags":[107,105,106,112],"class_list":["post-37687","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-case-studies","category-charging-energy-storage","category-industry-standards","tag-dhdl","tag-dry-type-transformer","tag-oil-immersed-transformer","tag-power-transformer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Does a Transformer Work? 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