{"id":6049,"date":"2026-01-12T08:57:23","date_gmt":"2026-01-12T08:57:23","guid":{"rendered":"https:\/\/www.ketetransformer.com\/?p=6049"},"modified":"2026-01-12T08:59:31","modified_gmt":"2026-01-12T08:59:31","slug":"how-to-correctly-select-transformer-capacity","status":"publish","type":"post","link":"https:\/\/www.ketetransformer.com\/fr\/how-to-correctly-select-transformer-capacity\/","title":{"rendered":"Comment choisir correctement la puissance d'un transformateur"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Choisir le bon <strong><a href=\"https:\/\/www.ketetransformer.com\/fr\/product\/transformer\/\">capacit\u00e9 du transformateur<\/a><\/strong> est essentiel pour garantir un fonctionnement s\u00fbr, un rendement \u00e9lev\u00e9 et une longue dur\u00e9e de vie. Un transformateur sous-dimensionn\u00e9 risque de subir une surcharge et de tomber en panne pr\u00e9matur\u00e9ment, tandis qu\u2019un transformateur surdimensionn\u00e9 entra\u00eene des co\u00fbts d\u2019investissement et d\u2019exploitation inutiles.<\/p>\n\n\n\n<div data-wp-context=\"{ &quot;autoclose&quot;: false, &quot;accordionItems&quot;: [] }\" data-wp-interactive=\"core\/accordion\" role=\"group\" class=\"wp-block-accordion is-layout-flow wp-block-accordion-is-layout-flow\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Calcul de la capacit\u00e9 d'un transformateur<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9tape 1 : S\u00e9lectionnez la tension nominale<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>C\u00f4t\u00e9 haute tension<\/strong>: Doit correspondre \u00e0 la tension du r\u00e9seau.<\/li>\n\n\n\n<li><strong>C\u00f4t\u00e9 basse tension<\/strong>: G\u00e9n\u00e9ralement s\u00e9lectionn\u00e9 <strong>5% ou 10% de plus que la tension du r\u00e9seau basse tension<\/strong>, en fonction de :\n<ul class=\"wp-block-list\">\n<li>Classe de tension du transformateur<\/li>\n\n\n\n<li>Tension d'imp\u00e9dance<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Cela garantit une tension suffisante en conditions de charge.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.ketetransformer.com\/wp-content\/uploads\/2026\/01\/Transformer-capacity-1024x683.webp\" alt=\"\" class=\"wp-image-6050\" srcset=\"https:\/\/www.ketetransformer.com\/wp-content\/uploads\/2026\/01\/Transformer-capacity-1024x683.webp 1024w, https:\/\/www.ketetransformer.com\/wp-content\/uploads\/2026\/01\/Transformer-capacity-300x200.webp 300w, https:\/\/www.ketetransformer.com\/wp-content\/uploads\/2026\/01\/Transformer-capacity-768x512.webp 768w, https:\/\/www.ketetransformer.com\/wp-content\/uploads\/2026\/01\/Transformer-capacity-600x400.webp 600w, https:\/\/www.ketetransformer.com\/wp-content\/uploads\/2026\/01\/Transformer-capacity.webp 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9tape 2 : D\u00e9terminer la capacit\u00e9 nominale<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La capacit\u00e9 nominale doit \u00eatre choisie en fonction de la <strong>charge combin\u00e9e maximale<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Calculez le <strong>charge active maximale (kW)<\/strong>.<\/li>\n\n\n\n<li>Convertir la puissance active (kW) en <strong>puissance apparente (kVA)<\/strong>.<\/li>\n\n\n\n<li>Si <strong>deux transformateurs<\/strong> sont utilis\u00e9s :\n<ul class=\"wp-block-list\">\n<li>Chaque transformateur peut \u00eatre s\u00e9lectionn\u00e9 \u00e0 l'adresse <strong>70% de la charge combin\u00e9e maximale<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Si <strong>un transformateur<\/strong> est utilis\u00e9 :\n<ul class=\"wp-block-list\">\n<li>La capacit\u00e9 devrait couvrir les <strong>charge totale avec une marge suffisante<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Les autres param\u00e8tres indiqu\u00e9s sur la plaque signal\u00e9tique doivent \u00eatre pris en compte conform\u00e9ment aux sp\u00e9cifications techniques du transformateur.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Exemple de calcul<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e9lectionnez un <strong>Transformateur 35\/10 kV<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Charge maximale : <strong>3 500 kW<\/strong><\/li>\n\n\n\n<li>Facteur de puissance : <strong>0.8<\/strong><\/li>\n\n\n\n<li>Nombre de transformateurs : <strong>2<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Calcul de la capacit\u00e9 :<\/strong><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mi>S<\/mi><mo>=<\/mo><mn>0.7<\/mn><mo>\u00d7<\/mo><mfrac><mn>3500<\/mn><mn>0.8<\/mn><\/mfrac><mo>=<\/mo><mn>3062<\/mn><mtext>&nbsp;kVA<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">S = 0,7 \u00d7 \\frac{3 500}{0,8} = 3 062 \\text{ kVA}<\/annotation><\/semantics><\/math>S = 0,7 \u00d7 0,83500 = 3 062 kVA<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e9lection recommand\u00e9e :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Puissance du transformateur : 3 150 kVA<\/strong><\/li>\n\n\n\n<li><strong>Rapport de tension : 35 kV \/ 10,5 kV<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e9lectionnez ensuite le mod\u00e8le de transformateur appropri\u00e9 dans le catalogue de produits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Formule de calcul de la capacit\u00e9 d'un transformateur<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9tape 1 : Calculer la puissance maximale par phase<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Calculez la puissance de charge de chaque phase s\u00e9par\u00e9ment :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Phase A : 10 kW<\/li>\n\n\n\n<li>Phase B : 9 kW<\/li>\n\n\n\n<li>Phase C : 11 kW<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">S\u00e9lectionnez le <strong>charge de phase maximale<\/strong>: <strong>11 kW<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Remarques :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00c9quipements monophas\u00e9s : utilisez le <strong>puissance nominale maximale<\/strong> d'apr\u00e8s la plaque signal\u00e9tique.<\/li>\n\n\n\n<li>\u00c9quipements triphas\u00e9s : divisez la puissance totale par <strong>3<\/strong> pour obtenir la puissance par phase.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exemple :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ordinateurs : 300 W \u00d7 10 unit\u00e9s<\/li>\n\n\n\n<li>Climatiseurs : 2 kW \u00d7 4 unit\u00e9s<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Charge totale de la phase C :<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mo stretchy=\"false\">(<\/mo><mn>0.3<\/mn><mo>\u00d7<\/mo><mn>10<\/mn><mo stretchy=\"false\">)<\/mo><mo>+<\/mo><mo stretchy=\"false\">(<\/mo><mn>2<\/mn><mo>\u00d7<\/mo><mn>4<\/mn><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mn>11<\/mn><mtext>&nbsp;kW<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">(0,3 \u00d7 10) + (2 \u00d7 4) = 11 \\text{ kW}<\/annotation><\/semantics><\/math>(0,3 \u00d7 10) + (2 \u00d7 4) = 11 kW<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9tape 2 : Calculer la puissance triphas\u00e9e totale<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mn>11<\/mn><mtext>&nbsp;kW<\/mtext><mo>\u00d7<\/mo><mn>3<\/mn><mo>=<\/mo><mn>33<\/mn><mtext>&nbsp;kW<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">11 \\text{ kW} \\times 3 = 33 \\text{ kW}<\/annotation><\/semantics><\/math>11 kW \u00d7 3 = 33 kW<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9tape 3 : Calculer la puissance d'entr\u00e9e du transformateur<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La plupart des transformateurs disponibles sur le march\u00e9 sont \u00e9quip\u00e9s d'un <strong>facteur de puissance d'environ 0,8<\/strong>, c'est pourquoi cette \u00e9tape est cruciale :<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mfrac><mn>33<\/mn><mn>0.8<\/mn><\/mfrac><mo>=<\/mo><mn>41.25<\/mn><mtext>&nbsp;kW<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">\\frac{33}{0,8} = 41,25 \\text{ kW}<\/annotation><\/semantics><\/math>0,833 = 41,25 kW<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9tape 4 : Calculer la puissance nominale requise du transformateur<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Selon le <em>Manuel de conception en g\u00e9nie \u00e9lectrique<\/em>, le facteur de charge du transformateur est g\u00e9n\u00e9ralement fix\u00e9 \u00e0 <strong>85%<\/strong> pour des charges constantes :<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mfrac><mn>41.25<\/mn><mn>0.85<\/mn><\/mfrac><mo>=<\/mo><mn>48.53<\/mn><mtext>&nbsp;kVA<\/mtext><\/mrow><annotation encoding=\"application\/x-tex\">\\frac{41,25}{0,85} = 48,53 \\text{ kVA}<\/annotation><\/semantics><\/math>0,8541,25\u200b = 48,53 kVA<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>S\u00e9lection finale :<\/strong><br>Choisissez un <strong>Transformateur de 50 kVA<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Points cl\u00e9s concernant la puissance nominale des transformateurs<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>La puissance nominale d'un transformateur correspond \u00e0 la <strong>puissance apparente maximale (kVA)<\/strong> qui garantit un fonctionnement normal dans les conditions sp\u00e9cifi\u00e9es.<\/li>\n\n\n\n<li>Cette puissance apparente est la <strong>charge maximale que le transformateur peut fournir en toute s\u00e9curit\u00e9<\/strong>.<\/li>\n\n\n\n<li>En fonctionnement nominal, <strong>la puissance apparente de sortie est \u00e9gale \u00e0 la puissance nominale<\/strong>.<\/li>\n\n\n\n<li>La puissance apparente absorb\u00e9e est de <strong>l\u00e9g\u00e8rement plus \u00e9lev\u00e9<\/strong> sup\u00e9rieure \u00e0 la capacit\u00e9 nominale en raison des pertes.<\/li>\n\n\n\n<li>\u00c9tant donn\u00e9 que le rendement des transformateurs est tr\u00e8s \u00e9lev\u00e9, <strong>La puissance apparente d'entr\u00e9e est souvent estim\u00e9e comme \u00e9tant \u00e9gale \u00e0 la puissance nominale.<\/strong>, et cette hypoth\u00e8se est acceptable dans la pratique de l'ing\u00e9nierie.<\/li>\n\n\n\n<li>Tant que le <strong>tension de sortie, courant, facteur de puissance et puissance apparente<\/strong> sont \u00e9gales ou inf\u00e9rieures \u00e0 la capacit\u00e9 nominale, le fonctionnement est s\u00fbr (dans des conditions normales).<\/li>\n\n\n\n<li>L'id\u00e9e selon laquelle les transformateurs doivent fonctionner <strong>inf\u00e9rieure \u00e0 90% de la capacit\u00e9 nominale<\/strong> en raison des pertes, c'est <strong>incorrect<\/strong>.<\/li>\n\n\n\n<li>Appliquer un <strong>marge de s\u00e9curit\u00e9<\/strong> lors du choix de la capacit\u00e9 en fonction de la charge calcul\u00e9e, c'est <strong>correct et recommand\u00e9<\/strong>.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. R\u00e9sum\u00e9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le calcul de la puissance d'un transformateur consiste \u00e0 <strong>pas compliqu\u00e9<\/strong>, mais il convient de pr\u00eater attention aux points suivants :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pr\u00e9cision du calcul de charge<\/li>\n\n\n\n<li>Prise en compte du facteur de puissance<\/li>\n\n\n\n<li>Marges de s\u00e9curit\u00e9 raisonnables<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Le choix d'une puissance de transformateur adapt\u00e9e garantit :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fonctionnement s\u00fbr et stable<\/li>\n\n\n\n<li>Rendement optimal<\/li>\n\n\n\n<li>R\u00e9duction des pertes d'\u00e9nergie<\/li>\n\n\n\n<li>Dur\u00e9e de vie prolong\u00e9e des transformateurs<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Selecting the correct transformer capacity is critical to ensure safe operation, high efficiency, and long service life. An undersized transformer may overload and fail prematurely, while an oversized transformer increases unnecessary investment and operating costs. Transformer Capacity Calculation Step 1: Select Rated Voltage This ensures adequate voltage under load conditions. Step 2: Determine Rated Capacity 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