{"id":37663,"date":"2026-07-17T03:44:40","date_gmt":"2026-07-17T03:44:40","guid":{"rendered":"https:\/\/dinghongtransformer.com\/?p=37663"},"modified":"2026-07-21T02:50:05","modified_gmt":"2026-07-21T02:50:05","slug":"electrical-transformer","status":"publish","type":"post","link":"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/","title":{"rendered":"Transformateur \u00e9lectrique : comment \u00e7a marche ? Un guide pratique pour les acheteurs de projets \u00e9nerg\u00e9tiques"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-f95d6a4d\">An electrical transformer is one of the most important devices in a power system. It allows electricity to be transmitted at high voltage, distributed through substations, and reduced to a usable voltage for factories, buildings, data centers, renewable energy projects, and residential networks.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-28686a78\">Although transformers are available in many sizes and designs, their basic operating principle is surprisingly simple: they transfer alternating-current electrical energy between circuits through electromagnetic induction, normally changing the voltage without changing the frequency.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-aab4b514\">Understanding how a transformer works helps buyers select the correct capacity, voltage ratio, winding material, cooling method, and protection design\u2014and avoid costly specification mistakes.<\/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\/industry-standards\/electrical-transformer\/#1_What_Are_the_Main_Parts_of_a_Transformer\" >1. What Are the Main Parts of 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\/industry-standards\/electrical-transformer\/#2_How_Does_an_Electrical_Transformer_Work\" >2. How Does an Electrical Transformer Work?<\/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\/industry-standards\/electrical-transformer\/#3_Why_Is_Alternating_Current_Required\" >3. Why Is Alternating Current Required?<\/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\/industry-standards\/electrical-transformer\/#4_Step-Up_vs_Step-Down_Transformers\" >4. 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-5\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#5_Dry-Type_and_Oil-Immersed_Transformers\" >5. Dry-Type and Oil-Immersed Transformers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#6_Hidden_Transformer_Facts_Buyers_Should_Know\" >6. Hidden Transformer Facts Buyers Should Know<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#61_Rated_capacity_is_normally_expressed_in_kVA_not_kW\" >6.1 Rated capacity is normally expressed in kVA, not kW<\/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\/industry-standards\/electrical-transformer\/#62_A_transformer_still_consumes_power_without_a_load\" >6.2 A transformer still consumes power without a load<\/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\/industry-standards\/electrical-transformer\/#63_Two_transformers_with_the_same_kVA_are_not_necessarily_equivalent\" >6.3 Two transformers with the same kVA are not necessarily equivalent<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#65_Transformer_humming_is_not_automatically_a_fault\" >6.5 Transformer humming is not automatically a fault<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#66_Installation_conditions_affect_actual_performance\" >6.6 Installation conditions affect actual performance<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#7_What_Information_Should_Buyers_Provide\" >7. What Information Should Buyers Provide?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#8_Why_Factory_Testing_Matters\" >8. Why Factory Testing Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#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-16\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#1_What_is_the_basic_working_principle_of_a_transformer\" >1. What is the basic working principle of a transformer?<\/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\/industry-standards\/electrical-transformer\/#2_Does_a_transformer_change_frequency\" >2. Does a transformer change frequency?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#3_Can_a_transformer_operate_with_DC_power\" >3. Can a transformer operate with DC power?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#4_What_is_the_difference_between_a_step-up_and_step-down_transformer\" >4. 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-20\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#5_Why_are_transformer_ratings_expressed_in_kVA\" >5. Why are transformer ratings expressed in kVA?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/dinghongtransformer.com\/fr\/blog\/industry-standards\/electrical-transformer\/#6_What_details_are_needed_for_a_transformer_quotation\" >6. What details are needed for a transformer quotation?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-wd-title title wd-51a83757\"><span class=\"ez-toc-section\" id=\"1_What_Are_the_Main_Parts_of_a_Transformer\"><\/span>1. What Are the Main Parts of a Transformer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6075c4ef\">A basic transformer contains three essential components:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-89b5bdc8\"><strong>Primary winding:<\/strong> Connected to the incoming AC power supply.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b72aa8f5\"><strong>Secondary winding:<\/strong> Connected to the equipment, distribution network, or load.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f7774f6d\"><strong>Magnetic core:<\/strong> Provides a controlled path for magnetic flux between the windings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7bf9acea\">The primary and secondary windings are electrically insulated from each other. They do not normally transfer power through a direct metal connection. Instead, energy passes through the changing magnetic field inside the core.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8bff1b36\">In practical power transformers, additional components may include insulation materials, bushings, tap changers, cooling fans, radiators, oil tanks, temperature sensors, protective relays, enclosures, and monitoring devices.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-b0dc9618\"><span class=\"ez-toc-section\" id=\"2_How_Does_an_Electrical_Transformer_Work\"><\/span>2. How Does an Electrical Transformer Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3399f239\">When an alternating voltage is applied to the primary winding, an alternating current flows through the coil. This current creates a changing magnetic flux in the transformer core.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-429f2fbe\">The magnetic flux passes through the secondary winding and induces an alternating voltage across it. This process is called mutual electromagnetic induction.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1a210c23\">The output voltage depends mainly on the ratio between the number of turns in the primary and secondary windings:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-21eb71da\"><strong>Primary voltage \u00f7 secondary voltage \u2248 primary turns \u00f7 secondary turns<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3d901527\">For example, when the secondary winding has more turns than the primary winding, the output voltage increases. This is a <strong>step-up transformer<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-20756c0e\">When the secondary winding has fewer turns, the output voltage decreases. This is a <strong>step-down transformer<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-84eef7ab\">In an ideal transformer, raising the voltage reduces the current, while lowering the voltage increases the current. The transformer changes the voltage-current combination, but it does not create additional electrical power.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-87d489b6\">Real transformers always have some losses, which is why buyers must check no-load loss, load loss, temperature rise, and efficiency\u2014not only rated capacity.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6f86f8b7\"><span class=\"ez-toc-section\" id=\"3_Why_Is_Alternating_Current_Required\"><\/span>3. Why Is Alternating Current Required?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c017ad13\">A conventional transformer requires a changing magnetic field. Alternating current continuously changes direction and magnitude, producing the magnetic variation needed to induce voltage in the secondary winding.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b4b910a5\">Direct current remains steady after switching and does not continuously produce the changing flux required for normal transformer action. Applying DC directly to a conventional AC transformer can cause excessive current, overheating, insulation damage, and winding failure.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-adabe80b\">This is one of the most important transformer facts that is often missing from basic purchasing guides: <strong>a transformer does not simply \u201creduce electricity.\u201d It depends on frequency, waveform, magnetic flux, and winding design.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0b350f47\">A transformer designed for 50Hz should therefore not automatically be used in a different-frequency system without technical confirmation. Frequency affects core flux, losses, temperature rise, noise, and physical design.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-b817446f\"><span class=\"ez-toc-section\" id=\"4_Step-Up_vs_Step-Down_Transformers\"><\/span>4. 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-6ecc8ab5\">Step-up transformers are commonly installed near generators, solar farms, wind turbines, and power plants. They increase voltage before electricity enters a transmission or collection network.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d05f1a53\">Higher voltage allows the same amount of power to be transmitted with lower current. Lower current helps reduce conductor losses and may reduce the required cable size.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-762dfe8e\">Step-down transformers are used closer to the final load. They convert transmission or medium-voltage electricity into levels suitable for industrial machines, commercial buildings, lighting systems, charging stations, and other equipment.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3ea4f05b\">A wind power project, for example, may use a transformer to increase turbine output voltage to 33kV or 38.5kV. An industrial facility may use another transformer to reduce 10kV or 11kV power to 0.4kV for low-voltage equipment.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-11f84dbc\"><span class=\"ez-toc-section\" id=\"5_Dry-Type_and_Oil-Immersed_Transformers\"><\/span>5. <a href=\"https:\/\/dinghongtransformer.com\/fr\/produit\/66kv-high-voltage-oil-immersed-power-transformer\/\" data-type=\"product\" data-id=\"37438\">Dry-Type and Oil-Immersed Transformers<\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-02c43f69\">The electromagnetic principle is similar, but the insulation and cooling methods are different.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f23a1a48\">A <strong><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 transformer<\/a><\/strong> uses solid insulation materials, commonly cast resin or impregnated insulation, and is cooled by natural or forced air. It has no insulating-oil leakage risk and is often selected for hospitals, schools, airports, metro systems, data centers, industrial buildings, and indoor power rooms.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e86edfeb\">The supplied DHDL product information includes 6\u201322kV dry-type distribution transformers and 33\u201338.5kV cast-resin dry-type transformers for commercial, industrial, renewable-energy, and critical-infrastructure applications.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f4b6e5cd\">An <strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/produit\/6-38-5kv-oil-immersed-distribution-transformer\/\" data-type=\"product\" data-id=\"37408\">oil-immersed transformer<\/a><\/strong> places the core and windings inside insulating liquid. The oil provides electrical insulation and transfers heat to the transformer tank and radiators. This design is widely used in outdoor substations, industrial parks, utility networks, rural distribution, and higher-capacity power projects.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-193aa950\"><strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/\">DHDL\u2019s product portfolio includes dry-type<\/a><\/strong>, distribution, ultra-high-voltage, and special transformers, together with switchgear and prefabricated-substation solutions for utility, industrial, data-center, and renewable-energy projects.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-f1f5f026\"><span class=\"ez-toc-section\" id=\"6_Hidden_Transformer_Facts_Buyers_Should_Know\"><\/span>6. Hidden Transformer Facts Buyers Should Know<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f0f109a4\"><span class=\"ez-toc-section\" id=\"61_Rated_capacity_is_normally_expressed_in_kVA_not_kW\"><\/span>6.1 Rated capacity is normally expressed in kVA, not kW<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-991459ef\">Transformer capacity is based on voltage and current. The usable active power in kW also depends on the load power factor. A 1000kVA transformer does not always supply 1000kW of usable active power.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-cd13a515\"><span class=\"ez-toc-section\" id=\"62_A_transformer_still_consumes_power_without_a_load\"><\/span>6.2 A transformer still consumes power without a load<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1c041bdc\">When the secondary side is disconnected, the energized transformer still draws magnetizing current and produces core losses. This is called no-load loss.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d6444ac2\">For transformers that remain energized continuously, even a small no-load-loss difference can create a significant lifecycle electricity cost.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-33a24940\"><span class=\"ez-toc-section\" id=\"63_Two_transformers_with_the_same_kVA_are_not_necessarily_equivalent\"><\/span>6.3 Two transformers with the same kVA are not necessarily equivalent<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-af6ecb3d\">Two 1000kVA transformers may have different:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Primary and secondary voltages<\/li>\n\n\n\n<li>Short-circuit impedance<\/li>\n\n\n\n<li>Vector groups<\/li>\n\n\n\n<li>Winding materials<\/li>\n\n\n\n<li>Loss values<\/li>\n\n\n\n<li>Temperature-rise limits<\/li>\n\n\n\n<li>Insulation levels<\/li>\n\n\n\n<li>Enclosure ratings<\/li>\n\n\n\n<li>Applicable standards<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4a39c712\">Comparing only capacity and price can lead to the wrong purchasing decision.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-92afcf52\"><span class=\"ez-toc-section\" id=\"65_Transformer_humming_is_not_automatically_a_fault\"><\/span>6.5 Transformer humming is not automatically a fault<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a7d08f51\">A transformer commonly produces a low-frequency operating sound caused mainly by magnetic activity in the core. However, unusual increases in noise may indicate loose components, overvoltage, harmonics, mechanical vibration, poor installation, or abnormal loading.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-2d6b51a2\"><span class=\"ez-toc-section\" id=\"66_Installation_conditions_affect_actual_performance\"><\/span>6.6 Installation conditions affect actual performance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-22d61519\">High altitude, high ambient temperature, restricted ventilation, humidity, dust, salt spray, and corrosive environments may require capacity correction or a customized design.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2bc1c267\"><strong><a href=\"https:\/\/dinghongtransformer.com\/fr\/\">DHDL<\/a><\/strong> states that its equipment can be adapted for IEC, ANSI, 50Hz or 60Hz requirements, copper or aluminum windings, and environmental conditions including high temperature, humidity, dust, corrosion, and outdoor installation.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-d4ab0621\"><span class=\"ez-toc-section\" id=\"7_What_Information_Should_Buyers_Provide\"><\/span>7. What Information Should Buyers Provide?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4056dc38\">A useful transformer inquiry should include more than a requested capacity.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-437753e9\">Provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rated capacity in kVA or MVA<\/li>\n\n\n\n<li>Primary and secondary voltage<\/li>\n\n\n\n<li>Fr\u00e9quence<\/li>\n\n\n\n<li>Phase configuration<\/li>\n\n\n\n<li>Vector group<\/li>\n\n\n\n<li>Short-circuit impedance<\/li>\n\n\n\n<li>Tap range<\/li>\n\n\n\n<li>Copper or aluminum winding<\/li>\n\n\n\n<li>Indoor or outdoor installation<\/li>\n\n\n\n<li>Ambient temperature and altitude<\/li>\n\n\n\n<li>Required IP protection level<\/li>\n\n\n\n<li>Dry-type or oil-immersed design<\/li>\n\n\n\n<li>IEC, ANSI\/IEEE, or project-specific standard<\/li>\n\n\n\n<li>Quantity and delivery destination<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9f69f495\">For renewable-energy or converter-connected loads, harmonic data and overload requirements may also be necessary.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-74401acb\"><span class=\"ez-toc-section\" id=\"8_Why_Factory_Testing_Matters\"><\/span>8. Why Factory Testing Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-463c6bb9\">A transformer can look correct externally while still having internal problems related to winding resistance, insulation, voltage ratio, losses, or assembly quality.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1999b9df\">Important routine tests typically include voltage-ratio testing, winding DC-resistance measurement, insulation testing, withstand-voltage testing, no-load-loss testing, load-loss testing, and impedance verification.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-675294bd\">DHDL describes process controls covering core materials, winding, vacuum drying, assembly, insulation, loss control, and routine factory testing, with technical files and test reports available for project delivery.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-5b40a382\"><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-33078f0b\">An electrical transformer works by using alternating current in the primary winding to create a changing magnetic field. This magnetic field induces voltage in the secondary winding, allowing the transformer to increase or decrease voltage while maintaining the same frequency.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-67bc88f4\">However, correct transformer selection requires more than understanding the basic working principle. Capacity, voltage ratio, impedance, vector group, losses, insulation, cooling, installation conditions, and local standards all affect long-term reliability.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3e8e9e8a\"><a href=\"https:\/\/dinghongtransformer.com\/fr\/\">DHDL manufactures transformers <\/a>and integrated power-distribution equipment for industrial, utility, renewable-energy, data-center, and infrastructure projects. To receive an accurate proposal, buyers should provide the complete electrical specification, installation environment, required standard, quantity, and destination country.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-3d80d7b2\"><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-d6f42e1a\"><span class=\"ez-toc-section\" id=\"1_What_is_the_basic_working_principle_of_a_transformer\"><\/span>1. What is the basic working principle of a transformer?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-61a1d1fc\">A transformer works through electromagnetic induction. Alternating current in the primary winding creates changing magnetic flux, which induces voltage in the secondary winding.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-34ad6b1b\"><span class=\"ez-toc-section\" id=\"2_Does_a_transformer_change_frequency\"><\/span>2. Does a transformer change frequency?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e5201051\">No. A conventional transformer changes voltage and current levels but normally keeps the output frequency the same as the input frequency.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-b11dcb77\"><span class=\"ez-toc-section\" id=\"3_Can_a_transformer_operate_with_DC_power\"><\/span>3. Can a transformer operate with DC power?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d9840d53\">A conventional AC transformer cannot operate normally with steady DC power because DC does not continuously create changing magnetic flux. Direct DC connection may cause overheating and winding damage.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f58ecd10\"><span class=\"ez-toc-section\" id=\"4_What_is_the_difference_between_a_step-up_and_step-down_transformer\"><\/span>4. 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-6732f5d6\">A step-up transformer increases the secondary voltage, while a step-down transformer reduces it. The voltage change is determined mainly by the winding-turn ratio.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f1ceed58\"><span class=\"ez-toc-section\" id=\"5_Why_are_transformer_ratings_expressed_in_kVA\"><\/span>5. Why are transformer ratings expressed in kVA?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-35bca812\">Transformer heating depends mainly on voltage and current, while the load power factor determines active power in kW. Therefore, transformers are normally rated in kVA or MVA.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-d0040926\"><span class=\"ez-toc-section\" id=\"6_What_details_are_needed_for_a_transformer_quotation\"><\/span>6. What details are needed for a transformer quotation?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ee6c6b0c\">Provide capacity, high and low voltage, frequency, vector group, impedance, tap range, winding material, installation conditions, applicable standard, quantity, and destination country.<\/p>","protected":false},"excerpt":{"rendered":"<p>Apprenez le fonctionnement d'un transformateur \u00e9lectrique, y compris l'induction \u00e9lectromagn\u00e9tique, les rapports de tension, les pertes, les m\u00e9thodes de refroidissement, les types de transformateurs et des conseils pratiques de s\u00e9lection.<\/p>","protected":false},"author":1,"featured_media":37665,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[98,73,72],"tags":[107,105,106],"class_list":["post-37663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industrial-power-projects","category-industry-standards","category-inudustry-trends","tag-dhdl","tag-dry-type-transformer","tag-oil-immersed-transformer"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Electrical Transformer: How Does It Work? 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