{"id":2155,"date":"2026-03-13T08:48:55","date_gmt":"2026-03-13T08:48:55","guid":{"rendered":"https:\/\/yawei-powertransformer.com\/?p=2155"},"modified":"2026-03-13T08:55:44","modified_gmt":"2026-03-13T08:55:44","slug":"how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems","status":"publish","type":"post","link":"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/","title":{"rendered":"Comment calculer la taille d'un transformateur (kVA) : Guide complet pour les syst\u00e8mes d'alimentation industriels et commerciaux"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 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 des mati\u00e8res<\/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' ><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Introduction\" >Introduction<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#What_Is_Transformer_kVA_Rating\" >Qu'est-ce que le kVA nominal d'un transformateur ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Power_Formula\" >Formule de puissance<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Basic_Transformer_Sizing_Formula\" >Formule de base pour le dimensionnement des transformateurs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><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:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Single-Phase_Transformer_Formula\" >Formule de transformateur monophas\u00e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Three-Phase_Transformer_Formula\" >Formule du transformateur triphas\u00e9<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Example_Industrial_Transformer_Sizing_Calculation\" >Exemple : Calcul du dimensionnement d'un transformateur industriel<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Industrial_Facility_Load\" >Charge des installations industrielles<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Transformer_Capacity_Calculation\" >Calcul de la capacit\u00e9 des transformateurs<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Standard_Transformer_Sizes_Used_in_Industry\" >Tailles standard des transformateurs utilis\u00e9s dans l'industrie<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Transformer_Oversizing_vs_Undersizing\" >Surdimensionnement et sous-dimensionnement des transformateurs<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Undersized_Transformer_Risks\" >Risques li\u00e9s aux transformateurs sous-dimensionn\u00e9s<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Oversized_Transformer_Problems\" >Probl\u00e8mes li\u00e9s aux transformateurs surdimensionn\u00e9s<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Factors_That_Affect_Transformer_Capacity_Selection\" >Facteurs influen\u00e7ant le choix de la capacit\u00e9 des transformateurs<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#1_Load_Type\" >1. Type de charge<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#2_Future_Expansion\" >2. Expansion future<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#3_Ambient_Temperature\" >3. Temp\u00e9rature ambiante<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#4_Harmonic_Loads\" >4. Charges harmoniques<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#5_Duty_Cycle\" >5. Cycle de travail<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Choosing_the_Right_Transformer_Type\" >Choisir le bon type de transformateur<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Pad-Mounted_Transformers\" >Transformateurs sur socle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Pole-Mounted_Transformers\" >Transformateurs sur poteau<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Substation_Transformers\" >Transformateurs de sous-stations<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Typical_Transformer_Voltage_Combinations\" >Combinaisons typiques de tensions de transformateur<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Best_Practices_for_Transformer_Selection\" >Meilleures pratiques pour la s\u00e9lection des transformateurs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/yawei-powertransformer.com\/fr\/how-to-calculate-transformer-size-kva-complete-guide-for-industrial-and-commercial-power-systems\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 data-section-id=\"13ax1s5\" data-start=\"192\" data-end=\"207\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"209\" data-end=\"510\">Le choix de la bonne taille de transformateur est l'une des d\u00e9cisions les plus importantes dans la conception d'un syst\u00e8me d'alimentation \u00e9lectrique. Un transformateur sous-dimensionn\u00e9 peut entra\u00eener une surchauffe, des chutes de tension et des pannes d'\u00e9quipement, tandis qu'un transformateur surdimensionn\u00e9 peut entra\u00eener des co\u00fbts d'investissement inutiles et des pertes \u00e0 vide plus \u00e9lev\u00e9es.<\/p>\n<p data-start=\"512\" data-end=\"701\">Pour les ing\u00e9nieurs, les entrepreneurs et les gestionnaires d'installations industrielles, comprendre <strong data-start=\"588\" data-end=\"635\">comment calculer la capacit\u00e9 du transformateur (kVA)<\/strong> est essentielle pour assurer une distribution fiable et efficace de l'\u00e9lectricit\u00e9.<\/p>\n<p data-start=\"703\" data-end=\"878\">Dans ce guide, nous expliquons les <strong data-start=\"733\" data-end=\"829\">formule de dimensionnement des transformateurs, m\u00e9thodes de calcul, exemples r\u00e9els et consid\u00e9rations pratiques<\/strong> utilis\u00e9s dans les syst\u00e8mes d'alimentation industriels et commerciaux.<\/p>\n<hr data-start=\"880\" data-end=\"883\" \/>\n<h1 data-section-id=\"1kf66y1\" data-start=\"885\" data-end=\"918\"><span class=\"ez-toc-section\" id=\"What_Is_Transformer_kVA_Rating\"><\/span>Qu'est-ce que le kVA nominal d'un transformateur ?<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"920\" data-end=\"1017\">La capacit\u00e9 d'un transformateur est g\u00e9n\u00e9ralement exprim\u00e9e en <strong data-start=\"976\" data-end=\"1001\">kVA (kilovolt-amp\u00e8re)<\/strong> au lieu de kW.<\/p>\n<p data-start=\"1019\" data-end=\"1096\">En effet, les transformateurs fournissent <strong data-start=\"1056\" data-end=\"1074\">puissance apparente<\/strong>, qui comprend les deux :<\/p>\n<ul data-start=\"1098\" data-end=\"1239\">\n<li data-section-id=\"6ele9r\" data-start=\"1098\" data-end=\"1158\">\n<p data-start=\"1100\" data-end=\"1158\"><strong data-start=\"1100\" data-end=\"1121\">Puissance active (kW)<\/strong> - la puissance r\u00e9elle utilis\u00e9e par l'\u00e9quipement<\/p>\n<\/li>\n<li data-section-id=\"1vx48s4\" data-start=\"1159\" data-end=\"1239\">\n<p data-start=\"1161\" data-end=\"1239\"><strong data-start=\"1161\" data-end=\"1186\">Puissance r\u00e9active (kVAR)<\/strong> - la puissance requise par les charges inductives telles que les moteurs<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1241\" data-end=\"1314\">La relation entre eux est d\u00e9termin\u00e9e par le <strong data-start=\"1292\" data-end=\"1313\">facteur de puissance (PF)<\/strong>.<\/p>\n<h3 data-section-id=\"1utk5tj\" data-start=\"1316\" data-end=\"1333\"><span class=\"ez-toc-section\" id=\"Power_Formula\"><\/span>Formule de puissance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1335\" data-end=\"1358\">kVA = kW \u00f7 Facteur de puissance<\/p>\n<p data-start=\"1360\" data-end=\"1372\">Par exemple :<\/p>\n<ul data-start=\"1374\" data-end=\"1414\">\n<li data-section-id=\"h728ke\" data-start=\"1374\" data-end=\"1391\">\n<p data-start=\"1376\" data-end=\"1391\">Charge = 100 kW<\/p>\n<\/li>\n<li data-section-id=\"9ij535\" data-start=\"1392\" data-end=\"1414\">\n<p data-start=\"1394\" data-end=\"1414\">Facteur de puissance = 0,8<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1416\" data-end=\"1442\">Taille du transformateur requise :<\/p>\n<p data-start=\"1444\" data-end=\"1473\"><strong data-start=\"1444\" data-end=\"1473\">kVA = 100 \u00f7 0,8 = 125 kVA<\/strong><\/p>\n<p data-start=\"1475\" data-end=\"1575\">Dans la pratique, les ing\u00e9nieurs choisissent g\u00e9n\u00e9ralement le <strong data-start=\"1517\" data-end=\"1553\">puissance du transformateur standard suivant<\/strong>, tels que <a href=\"https:\/\/yawei-powertransformer.com\/fr\/manufacturer\/150-kva-single-phase-pole-mounted-transformer-13-8-kv-to-120-240-v-onan-telephone-power-distribution-transformer\/\"><strong data-start=\"1563\" data-end=\"1574\">150 kVA<\/strong><\/a>.<\/p>\n<hr data-start=\"1577\" data-end=\"1580\" \/>\n<h1 data-section-id=\"hxvu6h\" data-start=\"1582\" data-end=\"1616\"><span class=\"ez-toc-section\" id=\"Basic_Transformer_Sizing_Formula\"><\/span>Formule de base pour le dimensionnement des transformateurs<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"1618\" data-end=\"1692\">La capacit\u00e9 du transformateur peut \u00e9galement \u00eatre calcul\u00e9e \u00e0 partir de la tension et du courant.<\/p>\n<h3 data-section-id=\"ominnv\" data-start=\"1694\" data-end=\"1730\"><span class=\"ez-toc-section\" id=\"Single-Phase_Transformer_Formula\"><\/span>Formule de transformateur monophas\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1732\" data-end=\"1764\">kVA = (Tension \u00d7 Courant) \u00f7 1000<\/p>\n<p data-start=\"1766\" data-end=\"1774\">Exemple :<\/p>\n<p data-start=\"1776\" data-end=\"1809\">Tension = 240 V<br data-start=\"1791\" data-end=\"1794\" \/>Courant = 100 A<\/p>\n<p data-start=\"1811\" data-end=\"1854\">kVA = (240 \u00d7 100) \u00f7 1000<br data-start=\"1835\" data-end=\"1838\" \/>kVA = <strong data-start=\"1844\" data-end=\"1854\">24 kVA<\/strong><\/p>\n<hr data-start=\"1856\" data-end=\"1859\" \/>\n<h3 data-section-id=\"dpvchr\" data-start=\"1861\" data-end=\"1896\"><span class=\"ez-toc-section\" id=\"Three-Phase_Transformer_Formula\"><\/span>Formule du transformateur triphas\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1898\" data-end=\"1965\">Pour les syst\u00e8mes industriels, les transformateurs triphas\u00e9s sont couramment utilis\u00e9s.<\/p>\n<p data-start=\"1967\" data-end=\"2004\">kVA = (\u221a3 \u00d7 Tension \u00d7 Courant) \u00f7 1000<\/p>\n<p data-start=\"2006\" data-end=\"2014\">Exemple :<\/p>\n<p data-start=\"2016\" data-end=\"2049\">Tension = 480 V<br data-start=\"2031\" data-end=\"2034\" \/>Courant = 120 A<\/p>\n<p data-start=\"2051\" data-end=\"2104\">kVA = (1,732 \u00d7 480 \u00d7 120) \u00f7 1000<br data-start=\"2083\" data-end=\"2086\" \/>kVA \u2248 <strong data-start=\"2092\" data-end=\"2104\">99,8 kVA<\/strong><\/p>\n<p data-start=\"2106\" data-end=\"2171\">Par cons\u00e9quent, un <strong data-start=\"2119\" data-end=\"2142\">Transformateur 100 kVA<\/strong> serait g\u00e9n\u00e9ralement s\u00e9lectionn\u00e9e.<\/p>\n<hr data-start=\"2173\" data-end=\"2176\" \/>\n<h1 data-section-id=\"1lrad0h\" data-start=\"2178\" data-end=\"2230\"><span class=\"ez-toc-section\" id=\"Example_Industrial_Transformer_Sizing_Calculation\"><\/span>Exemple : Calcul du dimensionnement d'un transformateur industriel<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"2232\" data-end=\"2266\">Prenons un exemple concret.<\/p>\n<h3 data-section-id=\"ixwew2\" data-start=\"2268\" data-end=\"2296\"><span class=\"ez-toc-section\" id=\"Industrial_Facility_Load\"><\/span>Charge des installations industrielles<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2298\" data-end=\"2319\">Charge totale connect\u00e9e :<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr style=\"height: 25.00pt;\">\n<th class=\"et2\" style=\"height: 25pt; width: 60.1942%;\" width=\"148\" height=\"33\">Equipement<\/th>\n<th class=\"et2\" style=\"width: 39.6117%;\" width=\"96\">Puissance<\/th>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 60.1942%;\" width=\"148\" height=\"33\">Moteurs<\/td>\n<td class=\"et3\" style=\"width: 39.6117%;\" width=\"96\">80 kW<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 60.1942%;\" width=\"148\" height=\"33\">Eclairage<\/td>\n<td class=\"et3\" style=\"width: 39.6117%;\" width=\"96\">20 kW<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 60.1942%;\" width=\"148\" height=\"33\">CVC<\/td>\n<td class=\"et3\" style=\"width: 39.6117%;\" width=\"96\">40 kW<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 60.1942%;\" width=\"148\" height=\"33\">Equipement<\/td>\n<td class=\"et3\" style=\"width: 39.6117%;\" width=\"96\">30 kW<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-start=\"2444\" data-end=\"2455\">Charge totale :<\/p>\n<p data-start=\"2457\" data-end=\"2467\"><strong data-start=\"2457\" data-end=\"2467\">170 kW<\/strong><\/p>\n<p data-start=\"2469\" data-end=\"2497\">Supposons un facteur de puissance moyen :<\/p>\n<p data-start=\"2499\" data-end=\"2511\"><strong data-start=\"2499\" data-end=\"2511\">PF = 0,9<\/strong><\/p>\n<h3 data-section-id=\"e1ifi8\" data-start=\"2513\" data-end=\"2549\"><span class=\"ez-toc-section\" id=\"Transformer_Capacity_Calculation\"><\/span>Calcul de la capacit\u00e9 des transformateurs<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2551\" data-end=\"2588\">kVA = 170 \u00f7 0,9<br data-start=\"2566\" data-end=\"2569\" \/>kVA = <strong data-start=\"2575\" data-end=\"2588\">188,9 kVA<\/strong><\/p>\n<p data-start=\"2590\" data-end=\"2641\">Les ing\u00e9nieurs ajoutent g\u00e9n\u00e9ralement un <strong data-start=\"2616\" data-end=\"2640\">20-25% marge de s\u00e9curit\u00e9<\/strong>.<\/p>\n<p data-start=\"2643\" data-end=\"2672\">Taille de transformateur recommand\u00e9e :<\/p>\n<p data-start=\"2674\" data-end=\"2685\"><strong data-start=\"2674\" data-end=\"2685\">250 kVA<\/strong><\/p>\n<p data-start=\"2687\" data-end=\"2708\">Cela permet d'avoir de la place pour :<\/p>\n<ul data-start=\"2710\" data-end=\"2779\">\n<li data-section-id=\"n1w2em\" data-start=\"2710\" data-end=\"2730\">\n<p data-start=\"2712\" data-end=\"2730\">fluctuation de la charge<\/p>\n<\/li>\n<li data-section-id=\"18pevce\" data-start=\"2731\" data-end=\"2760\">\n<p data-start=\"2733\" data-end=\"2760\">courant de d\u00e9marrage de l'\u00e9quipement<\/p>\n<\/li>\n<li data-section-id=\"163ytjo\" data-start=\"2761\" data-end=\"2779\">\n<p data-start=\"2763\" data-end=\"2779\">expansion future<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"2781\" data-end=\"2784\" \/>\n<h1 data-section-id=\"e4dlca\" data-start=\"2786\" data-end=\"2831\"><span class=\"ez-toc-section\" id=\"Standard_Transformer_Sizes_Used_in_Industry\"><\/span>Tailles standard des transformateurs utilis\u00e9s dans l'industrie<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"2833\" data-end=\"2889\">La plupart des fabricants fournissent des valeurs nominales standard pour les transformateurs.<\/p>\n<p data-start=\"2891\" data-end=\"2938\">Les tailles typiques des transformateurs de distribution sont les suivantes<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr style=\"height: 25.00pt;\">\n<th class=\"et2\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Application<\/th>\n<th class=\"et2\" style=\"width: 51.068%;\" width=\"284\">Taille typique du transformateur<\/th>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Petit b\u00e2timent commercial<\/td>\n<td class=\"et3\" style=\"width: 51.068%;\" width=\"284\">45 - 75 kVA<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Magasin de d\u00e9tail<\/td>\n<td class=\"et3\" style=\"width: 51.068%;\" width=\"284\">75 - 150 kVA<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Installation commerciale moyenne<\/td>\n<td class=\"et3\" style=\"width: 51.068%;\" width=\"284\">150 - 300 kVA<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Usine industrielle<\/td>\n<td class=\"et3\" style=\"width: 51.068%;\" width=\"284\">300 - 1000 kVA<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et3\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Grands syst\u00e8mes industriels<\/td>\n<td class=\"et3\" style=\"width: 51.068%;\" width=\"284\">1000 kVA - 5000 kVA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-start=\"3239\" data-end=\"3327\">Le choix de l'indice correct garantit <strong data-start=\"3275\" data-end=\"3326\">un fonctionnement efficace et une dur\u00e9e de vie plus longue du transformateur<\/strong>.<\/p>\n<hr data-start=\"3329\" data-end=\"3332\" \/>\n<h1 data-section-id=\"94r7b2\" data-start=\"3334\" data-end=\"3373\"><span class=\"ez-toc-section\" id=\"Transformer_Oversizing_vs_Undersizing\"><\/span>Surdimensionnement et sous-dimensionnement des transformateurs<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2 data-section-id=\"1ez2hmv\" data-start=\"3375\" data-end=\"3406\"><span class=\"ez-toc-section\" id=\"Undersized_Transformer_Risks\"><\/span>Risques li\u00e9s aux transformateurs sous-dimensionn\u00e9s<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"3408\" data-end=\"3449\">Si la capacit\u00e9 du transformateur est trop faible :<\/p>\n<ul data-start=\"3451\" data-end=\"3564\">\n<li data-section-id=\"15wft32\" data-start=\"3451\" data-end=\"3464\">\n<p data-start=\"3453\" data-end=\"3464\">surchauffe<\/p>\n<\/li>\n<li data-section-id=\"at34lw\" data-start=\"3465\" data-end=\"3489\">\n<p data-start=\"3467\" data-end=\"3489\">d\u00e9gradation de l'isolation<\/p>\n<\/li>\n<li data-section-id=\"7rgmbn\" data-start=\"3490\" data-end=\"3504\">\n<p data-start=\"3492\" data-end=\"3504\">chute de tension<\/p>\n<\/li>\n<li data-section-id=\"rf2ay4\" data-start=\"3505\" data-end=\"3533\">\n<p data-start=\"3507\" data-end=\"3533\">la r\u00e9duction de la dur\u00e9e de vie des \u00e9quipements<\/p>\n<\/li>\n<li data-section-id=\"16cg0vi\" data-start=\"3534\" data-end=\"3564\">\n<p data-start=\"3536\" data-end=\"3564\">d\u00e9faillance possible du transformateur<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3566\" data-end=\"3632\">Il s'agit d'un probl\u00e8me courant dans les installations industrielles en expansion rapide.<\/p>\n<hr data-start=\"3634\" data-end=\"3637\" \/>\n<h2 data-section-id=\"gd3ga1\" data-start=\"3639\" data-end=\"3672\"><span class=\"ez-toc-section\" id=\"Oversized_Transformer_Problems\"><\/span>Probl\u00e8mes li\u00e9s aux transformateurs surdimensionn\u00e9s<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"3674\" data-end=\"3708\">Le surdimensionnement pr\u00e9sente \u00e9galement des inconv\u00e9nients :<\/p>\n<ul data-start=\"3710\" data-end=\"3793\">\n<li data-section-id=\"j0kjht\" data-start=\"3710\" data-end=\"3732\">\n<p data-start=\"3712\" data-end=\"3732\">co\u00fbt d'achat plus \u00e9lev\u00e9<\/p>\n<\/li>\n<li data-section-id=\"1ds5k53\" data-start=\"3733\" data-end=\"3759\">\n<p data-start=\"3735\" data-end=\"3759\">augmentation des pertes \u00e0 vide<\/p>\n<\/li>\n<li data-section-id=\"dn369u\" data-start=\"3760\" data-end=\"3793\">\n<p data-start=\"3762\" data-end=\"3793\">une efficacit\u00e9 moindre \u00e0 faible charge<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3795\" data-end=\"3917\">Par cons\u00e9quent, la meilleure pratique consiste \u00e0 choisir un transformateur <strong data-start=\"3851\" data-end=\"3916\">proche de la charge calcul\u00e9e avec une marge d'expansion raisonnable<\/strong>.<\/p>\n<hr data-start=\"3919\" data-end=\"3922\" \/>\n<h1 data-section-id=\"1q0obql\" data-start=\"3924\" data-end=\"3976\"><span class=\"ez-toc-section\" id=\"Factors_That_Affect_Transformer_Capacity_Selection\"><\/span>Facteurs influen\u00e7ant le choix de la capacit\u00e9 des transformateurs<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"3978\" data-end=\"4045\">Plusieurs facteurs doivent \u00eatre pris en compte lors du choix de la taille du transformateur.<\/p>\n<h2 data-section-id=\"b9ep0k\" data-start=\"4047\" data-end=\"4062\"><span class=\"ez-toc-section\" id=\"1_Load_Type\"><\/span>1. Type de charge<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4064\" data-end=\"4099\">Des charges diff\u00e9rentes se comportent diff\u00e9remment.<\/p>\n<p data-start=\"4101\" data-end=\"4110\">Exemples :<\/p>\n<ul data-start=\"4112\" data-end=\"4183\">\n<li data-section-id=\"159d4y8\" data-start=\"4112\" data-end=\"4120\">\n<p data-start=\"4114\" data-end=\"4120\">moteurs<\/p>\n<\/li>\n<li data-section-id=\"ufvye0\" data-start=\"4121\" data-end=\"4140\">\n<p data-start=\"4123\" data-end=\"4140\">mat\u00e9riel de soudage<\/p>\n<\/li>\n<li data-section-id=\"1tr1blu\" data-start=\"4141\" data-end=\"4155\">\n<p data-start=\"4143\" data-end=\"4155\">Syst\u00e8mes CVC<\/p>\n<\/li>\n<li data-section-id=\"1d8lsid\" data-start=\"4156\" data-end=\"4183\">\n<p data-start=\"4158\" data-end=\"4183\">variateurs de fr\u00e9quence<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4185\" data-end=\"4279\">Les charges de moteur n\u00e9cessitent souvent <strong data-start=\"4211\" data-end=\"4238\">courant de d\u00e9marrage plus \u00e9lev\u00e9<\/strong>, qui doit \u00eatre pris en compte lors du dimensionnement.<\/p>\n<hr data-start=\"4281\" data-end=\"4284\" \/>\n<h2 data-section-id=\"hhaged\" data-start=\"4286\" data-end=\"4308\"><span class=\"ez-toc-section\" id=\"2_Future_Expansion\"><\/span>2. Expansion future<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4310\" data-end=\"4355\">Les installations industrielles s'agrandissent souvent au fil du temps.<\/p>\n<p data-start=\"4357\" data-end=\"4444\">Les ing\u00e9nieurs r\u00e9servent g\u00e9n\u00e9ralement <strong data-start=\"4385\" data-end=\"4415\">20-30% capacit\u00e9 suppl\u00e9mentaire<\/strong> pour soutenir les \u00e9quipements futurs.<\/p>\n<hr data-start=\"4446\" data-end=\"4449\" \/>\n<h2 data-section-id=\"7kb964\" data-start=\"4451\" data-end=\"4476\"><span class=\"ez-toc-section\" id=\"3_Ambient_Temperature\"><\/span>3. Temp\u00e9rature ambiante<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4478\" data-end=\"4542\">Une temp\u00e9rature ambiante \u00e9lev\u00e9e r\u00e9duit l'efficacit\u00e9 du refroidissement du transformateur.<\/p>\n<p data-start=\"4544\" data-end=\"4651\">Les transformateurs ext\u00e9rieurs fonctionnant dans des climats chauds peuvent avoir besoin de <strong data-start=\"4603\" data-end=\"4650\">une capacit\u00e9 plus \u00e9lev\u00e9e ou des m\u00e9thodes de refroidissement am\u00e9lior\u00e9es<\/strong>.<\/p>\n<hr data-start=\"4653\" data-end=\"4656\" \/>\n<h2 data-section-id=\"fmb4nr\" data-start=\"4658\" data-end=\"4678\"><span class=\"ez-toc-section\" id=\"4_Harmonic_Loads\"><\/span>4. Charges harmoniques<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4680\" data-end=\"4726\">Les installations modernes utilisent de nombreux appareils \u00e9lectroniques :<\/p>\n<ul data-start=\"4728\" data-end=\"4769\">\n<li data-section-id=\"nu7ld4\" data-start=\"4728\" data-end=\"4741\">\n<p data-start=\"4730\" data-end=\"4741\">Syst\u00e8mes UPS<\/p>\n<\/li>\n<li data-section-id=\"16uiqbk\" data-start=\"4742\" data-end=\"4756\">\n<p data-start=\"4744\" data-end=\"4756\">centres de donn\u00e9es<\/p>\n<\/li>\n<li data-section-id=\"2cbyf7\" data-start=\"4757\" data-end=\"4769\">\n<p data-start=\"4759\" data-end=\"4769\">Entra\u00eenements VFD<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"4771\" data-end=\"4848\">Ceux-ci cr\u00e9ent <strong data-start=\"4784\" data-end=\"4807\">distorsion harmonique<\/strong>, ce qui peut augmenter l'\u00e9chauffement du transformateur.<\/p>\n<p data-start=\"4850\" data-end=\"4928\">Dans ce cas, <strong data-start=\"4865\" data-end=\"4889\">Transformateurs class\u00e9s K<\/strong> ou une capacit\u00e9 sup\u00e9rieure peut \u00eatre recommand\u00e9e.<\/p>\n<hr data-start=\"4930\" data-end=\"4933\" \/>\n<h2 data-section-id=\"19teo0i\" data-start=\"4935\" data-end=\"4951\"><span class=\"ez-toc-section\" id=\"5_Duty_Cycle\"><\/span>5. Cycle de travail<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4953\" data-end=\"5046\">Les charges continues n\u00e9cessitent un dimensionnement plus prudent du transformateur par rapport aux charges intermittentes.<\/p>\n<p data-start=\"5048\" data-end=\"5060\">Par exemple :<\/p>\n<ul data-start=\"5062\" data-end=\"5124\">\n<li data-section-id=\"1syq8jk\" data-start=\"5062\" data-end=\"5078\">\n<p data-start=\"5064\" data-end=\"5078\">centres de donn\u00e9es<\/p>\n<\/li>\n<li data-section-id=\"ta3igl\" data-start=\"5079\" data-end=\"5102\">\n<p data-start=\"5081\" data-end=\"5102\">lignes de fabrication<\/p>\n<\/li>\n<li data-section-id=\"sjfnj8\" data-start=\"5103\" data-end=\"5124\">\n<p data-start=\"5105\" data-end=\"5124\">op\u00e9rations mini\u00e8res<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5126\" data-end=\"5168\">Ces applications fonctionnent souvent <strong data-start=\"5159\" data-end=\"5167\">24\/7<\/strong>.<\/p>\n<hr data-start=\"5170\" data-end=\"5173\" \/>\n<h1 data-section-id=\"yeakkk\" data-start=\"5175\" data-end=\"5212\"><span class=\"ez-toc-section\" id=\"Choosing_the_Right_Transformer_Type\"><\/span>Choisir le bon type de transformateur<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"5214\" data-end=\"5314\">Apr\u00e8s avoir d\u00e9termin\u00e9 la capacit\u00e9 du transformateur, l'\u00e9tape suivante consiste \u00e0 choisir le type de transformateur appropri\u00e9.<\/p>\n<p data-start=\"5316\" data-end=\"5339\">Les options les plus courantes sont les suivantes :<\/p>\n<h3 data-section-id=\"1eoswsa\" data-start=\"5341\" data-end=\"5369\"><span class=\"ez-toc-section\" id=\"Pad-Mounted_Transformers\"><\/span><a href=\"https:\/\/yawei-powertransformer.com\/fr\/Wholesale\/pad-mounted-transformers\/\">Transformateurs sur socle<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5371\" data-end=\"5379\">Utilis\u00e9 dans :<\/p>\n<ul data-start=\"5381\" data-end=\"5449\">\n<li data-section-id=\"h4ppm9\" data-start=\"5381\" data-end=\"5403\">\n<p data-start=\"5383\" data-end=\"5403\">b\u00e2timents commerciaux<\/p>\n<\/li>\n<li data-section-id=\"1urpppc\" data-start=\"5404\" data-end=\"5430\">\n<p data-start=\"5406\" data-end=\"5430\">distribution r\u00e9sidentielle<\/p>\n<\/li>\n<li data-section-id=\"55i7ys\" data-start=\"5431\" data-end=\"5449\">\n<p data-start=\"5433\" data-end=\"5449\">parcs industriels<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5451\" data-end=\"5462\">Avantages :<\/p>\n<ul data-start=\"5464\" data-end=\"5526\">\n<li data-section-id=\"ggvmv\" data-start=\"5464\" data-end=\"5491\">\n<p data-start=\"5466\" data-end=\"5491\">installation au niveau du sol<\/p>\n<\/li>\n<li data-section-id=\"u862n1\" data-start=\"5492\" data-end=\"5508\">\n<p data-start=\"5494\" data-end=\"5508\">conception compacte<\/p>\n<\/li>\n<li data-section-id=\"1vjmu16\" data-start=\"5509\" data-end=\"5526\">\n<p data-start=\"5511\" data-end=\"5526\">am\u00e9lioration de la s\u00e9curit\u00e9<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"5528\" data-end=\"5531\" \/>\n<h3 data-section-id=\"6b5mah\" data-start=\"5533\" data-end=\"5562\"><span class=\"ez-toc-section\" id=\"Pole-Mounted_Transformers\"><\/span><a href=\"https:\/\/yawei-powertransformer.com\/fr\/wholesale\/transformateurs-sur-poteau\/\">Transformateurs sur poteau<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5564\" data-end=\"5574\">Commun dans :<\/p>\n<ul data-start=\"5576\" data-end=\"5625\">\n<li data-section-id=\"1cflf2t\" data-start=\"5576\" data-end=\"5602\">\n<p data-start=\"5578\" data-end=\"5602\">distribution d'\u00e9lectricit\u00e9 en milieu rural<\/p>\n<\/li>\n<li data-section-id=\"d90kuk\" data-start=\"5603\" data-end=\"5625\">\n<p data-start=\"5605\" data-end=\"5625\">lignes \u00e9lectriques a\u00e9riennes<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5627\" data-end=\"5638\">Avantages :<\/p>\n<ul data-start=\"5640\" data-end=\"5687\">\n<li data-section-id=\"d9muqz\" data-start=\"5640\" data-end=\"5663\">\n<p data-start=\"5642\" data-end=\"5663\">faible co\u00fbt d'installation<\/p>\n<\/li>\n<li data-section-id=\"mncdep\" data-start=\"5664\" data-end=\"5687\">\n<p data-start=\"5666\" data-end=\"5687\">une infrastructure simple<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"5689\" data-end=\"5692\" \/>\n<h3 data-section-id=\"16f7cg\" data-start=\"5694\" data-end=\"5721\"><span class=\"ez-toc-section\" id=\"Substation_Transformers\"><\/span><a href=\"https:\/\/yawei-powertransformer.com\/fr\/Wholesale\/substation-transformers\/\">Transformateurs de sous-stations<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5723\" data-end=\"5731\">Utilis\u00e9 dans :<\/p>\n<ul data-start=\"5733\" data-end=\"5799\">\n<li data-section-id=\"8ki7ph\" data-start=\"5733\" data-end=\"5754\">\n<p data-start=\"5735\" data-end=\"5754\">sous-stations de services publics<\/p>\n<\/li>\n<li data-section-id=\"x1cecj\" data-start=\"5755\" data-end=\"5769\">\n<p data-start=\"5757\" data-end=\"5769\">centrales \u00e9lectriques<\/p>\n<\/li>\n<li data-section-id=\"hpldn5\" data-start=\"5770\" data-end=\"5799\">\n<p data-start=\"5772\" data-end=\"5799\">grandes installations industrielles<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"5801\" data-end=\"5812\">Avantages :<\/p>\n<ul data-start=\"5814\" data-end=\"5855\">\n<li data-section-id=\"1nrfg4y\" data-start=\"5814\" data-end=\"5829\">\n<p data-start=\"5816\" data-end=\"5829\">grande capacit\u00e9<\/p>\n<\/li>\n<li data-section-id=\"1syx66s\" data-start=\"5830\" data-end=\"5855\">\n<p data-start=\"5832\" data-end=\"5855\">capacit\u00e9 de haute tension<\/p>\n<\/li>\n<\/ul>\n<hr data-start=\"5857\" data-end=\"5860\" \/>\n<h1 data-section-id=\"1fuhl2n\" data-start=\"5862\" data-end=\"5904\"><span class=\"ez-toc-section\" id=\"Typical_Transformer_Voltage_Combinations\"><\/span>Combinaisons typiques de tensions de transformateur<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"5906\" data-end=\"5977\">Les transformateurs industriels utilisent souvent les configurations de tension suivantes :<\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr style=\"height: 25.00pt;\">\n<th class=\"et3\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">Tension primaire<\/th>\n<th class=\"et3\" style=\"width: 51.068%;\" width=\"284\">Tension secondaire<\/th>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et4\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">13,8 kV<\/td>\n<td class=\"et4\" style=\"width: 51.068%;\" width=\"284\">480V<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et4\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">33 kV<\/td>\n<td class=\"et4\" style=\"width: 51.068%;\" width=\"284\">400V<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et4\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">34,5 kV<\/td>\n<td class=\"et4\" style=\"width: 51.068%;\" width=\"284\">480V<\/td>\n<\/tr>\n<tr style=\"height: 25.00pt;\">\n<td class=\"et4\" style=\"height: 25pt; width: 48.7379%;\" width=\"272\" height=\"33\">11 kV<\/td>\n<td class=\"et4\" style=\"width: 51.068%;\" width=\"284\">415V<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-start=\"6131\" data-end=\"6207\">La configuration exacte d\u00e9pend de la <strong data-start=\"6170\" data-end=\"6206\">conception de syst\u00e8mes de distribution d'\u00e9nergie<\/strong>.<\/p>\n<hr data-start=\"6209\" data-end=\"6212\" \/>\n<h1 data-section-id=\"jbbfny\" data-start=\"6214\" data-end=\"6256\"><span class=\"ez-toc-section\" id=\"Best_Practices_for_Transformer_Selection\"><\/span>Meilleures pratiques pour la s\u00e9lection des transformateurs<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"6258\" data-end=\"6308\">Les ing\u00e9nieurs \u00e9lectriciens suivent g\u00e9n\u00e9ralement les \u00e9tapes suivantes :<\/p>\n<ol data-start=\"6310\" data-end=\"6545\">\n<li data-section-id=\"7w09hh\" data-start=\"6310\" data-end=\"6345\">\n<p data-start=\"6313\" data-end=\"6345\">Calculer la charge totale connect\u00e9e<\/p>\n<\/li>\n<li data-section-id=\"om61f\" data-start=\"6346\" data-end=\"6375\">\n<p data-start=\"6349\" data-end=\"6375\">D\u00e9terminer la tension du syst\u00e8me<\/p>\n<\/li>\n<li data-section-id=\"140nz31\" data-start=\"6376\" data-end=\"6412\">\n<p data-start=\"6379\" data-end=\"6412\">Calculer la capacit\u00e9 en kVA requise<\/p>\n<\/li>\n<li data-section-id=\"d7v4m6\" data-start=\"6413\" data-end=\"6449\">\n<p data-start=\"6416\" data-end=\"6449\">Ajouter une marge de s\u00e9curit\u00e9 pour l'expansion<\/p>\n<\/li>\n<li data-section-id=\"1abqkeq\" data-start=\"6450\" data-end=\"6490\">\n<p data-start=\"6453\" data-end=\"6490\">S\u00e9lectionner le type de transformateur appropri\u00e9<\/p>\n<\/li>\n<li data-section-id=\"17s1z5\" data-start=\"6491\" data-end=\"6545\">\n<p data-start=\"6494\" data-end=\"6545\">Confirmer l'environnement d'installation (int\u00e9rieur \/ ext\u00e9rieur)<\/p>\n<\/li>\n<\/ol>\n<p data-start=\"6547\" data-end=\"6635\">Le respect de ces \u00e9tapes permet de garantir <strong data-start=\"6582\" data-end=\"6634\">une distribution d'\u00e9lectricit\u00e9 s\u00fbre, fiable et efficace<\/strong>.<\/p>\n<hr data-start=\"6637\" data-end=\"6640\" \/>\n<h1 data-section-id=\"fsb6xx\" data-start=\"6642\" data-end=\"6654\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p data-start=\"6656\" data-end=\"6866\">Le dimensionnement correct des transformateurs est essentiel pour assurer la fiabilit\u00e9 des performances des syst\u00e8mes \u00e9lectriques. Le choix d'une capacit\u00e9 de transformation appropri\u00e9e permet d'\u00e9viter les surchauffes, de r\u00e9duire les pertes et d'assurer une stabilit\u00e9 op\u00e9rationnelle \u00e0 long terme.<\/p>\n<p data-start=\"6868\" data-end=\"7073\">En utilisant la bonne <strong data-start=\"6888\" data-end=\"6916\">Formules de calcul des kVA<\/strong>, En \u00e9valuant les caract\u00e9ristiques de la charge et en envisageant une expansion future, les ing\u00e9nieurs peuvent s\u00e9lectionner le transformateur optimal pour les applications industrielles et commerciales.<\/p>\n<p data-start=\"7075\" data-end=\"7243\">En tant que professionnel <strong data-start=\"7093\" data-end=\"7127\"><a href=\"https:\/\/yawei-powertransformer.com\/fr\/Wholesale\/hv-power-transformers\/\">transformateur de puissance<\/a> fabricant<\/strong>, Yawei Transformer fournit des solutions de transformation personnalis\u00e9es pour des projets industriels et de services publics \u00e0 l'\u00e9chelle mondiale, notamment :<\/p>\n<ul data-start=\"7245\" data-end=\"7361\">\n<li data-section-id=\"q5hba2\" data-start=\"7245\" data-end=\"7274\">\n<p data-start=\"7247\" data-end=\"7274\">transformateurs de distribution<\/p>\n<\/li>\n<li data-section-id=\"bcegqc\" data-start=\"7275\" data-end=\"7303\">\n<p data-start=\"7277\" data-end=\"7303\">transformateurs sur socle<\/p>\n<\/li>\n<li data-section-id=\"yj4ljr\" data-start=\"7304\" data-end=\"7333\">\n<p data-start=\"7306\" data-end=\"7333\">transformateurs mont\u00e9s sur poteaux<\/p>\n<\/li>\n<li data-section-id=\"mrs9ge\" data-start=\"7334\" data-end=\"7361\">\n<p data-start=\"7336\" data-end=\"7361\">transformateurs de sous-station<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"7363\" data-end=\"7538\">Si vous avez besoin d'aide pour s\u00e9lectionner la capacit\u00e9 de transformateur adapt\u00e9e \u00e0 votre projet, notre \u00e9quipe d'ing\u00e9nieurs est pr\u00eate \u00e0 vous aider. <strong data-start=\"7491\" data-end=\"7537\">assistance technique et solutions personnalis\u00e9es<\/strong>.<\/p>\n\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f280-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"280\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/fr\/wp-json\/wp\/v2\/posts\/2155#wpcf7-f280-o1\" method=\"post\" class=\"wpcf7-form init\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\" data-trp-original-action=\"\/fr\/wp-json\/wp\/v2\/posts\/2155#wpcf7-f280-o1\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"280\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.1.4\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f280-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" 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An undersized transformer may lead to overheating, voltage drops, and equipment failure, while an oversized transformer can result in unnecessary investment costs and higher no-load losses. For engineers, contractors, and industrial facility managers, understanding how to calculate [&#8230;]\n","protected":false},"author":3,"featured_media":2156,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[353,350,319,354,351,315,355,349,352,348],"class_list":["post-2155","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-electrical-transformer-guide","tag-how-to-size-a-transformer","tag-industrial-power-transformer","tag-power-distribution-transformer","tag-three-phase-transformer-sizing","tag-transformer-capacity-calculation","tag-transformer-engineering-basics","tag-transformer-kva-calculation","tag-transformer-load-calculation","tag-transformer-size-calculation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Calculate Transformer Size (kVA) for Industrial &amp; Commercial Power Systems | Transformer Capacity Guide \u2013 Yawei Transformer<\/title>\n<meta name=\"description\" content=\"Learn how to calculate transformer size (kVA) for industrial and commercial power systems. 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This complete guide explains transformer capacity formulas, sizing methods, and practical engineering examples for selecting the right distribution transformer. 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