{"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\/es\/how-to-correctly-select-transformer-capacity\/","title":{"rendered":"C\u00f3mo seleccionar correctamente la capacidad de un transformador"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Elegir el correcto <strong><a href=\"https:\/\/www.ketetransformer.com\/es\/product\/transformer\/\">capacidad del transformador<\/a><\/strong> Es fundamental para garantizar un funcionamiento seguro, una alta eficiencia y una larga vida \u00fatil. Un transformador de capacidad insuficiente puede sobrecargarse y fallar prematuramente, mientras que uno de capacidad excesiva supone una inversi\u00f3n innecesaria y un aumento de los costes de funcionamiento.<\/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\">C\u00e1lculo de la capacidad de un transformador<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Paso 1: Seleccionar la tensi\u00f3n nominal<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lado de alta tensi\u00f3n<\/strong>: Debe coincidir con la tensi\u00f3n de la red el\u00e9ctrica.<\/li>\n\n\n\n<li><strong>Lado de baja tensi\u00f3n<\/strong>: Se suele seleccionar <strong>5% o 10% por encima de la tensi\u00f3n de la red de baja tensi\u00f3n<\/strong>, dependiendo de:\n<ul class=\"wp-block-list\">\n<li>Clase de tensi\u00f3n del transformador<\/li>\n\n\n\n<li>Tensi\u00f3n de impedancia<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Esto garantiza una tensi\u00f3n adecuada en condiciones de carga.<\/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\">Paso 2: Determinar la capacidad nominal<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La capacidad nominal debe seleccionarse en funci\u00f3n de la <strong>carga m\u00e1xima combinada<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Calcula el <strong>carga activa m\u00e1xima (kW)<\/strong>.<\/li>\n\n\n\n<li>Convertir la potencia activa (kW) a <strong>potencia aparente (kVA)<\/strong>.<\/li>\n\n\n\n<li>Si <strong>dos transformadores<\/strong> se utilizan:\n<ul class=\"wp-block-list\">\n<li>Cada transformador se puede seleccionar en <strong>70% de la carga m\u00e1xima combinada<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Si <strong>un transformador<\/strong> se utiliza:\n<ul class=\"wp-block-list\">\n<li>La capacidad deber\u00eda cubrir el <strong>carga total con un margen suficiente<\/strong>.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Se deben tener en cuenta otros par\u00e1metros indicados en la placa de caracter\u00edsticas, de acuerdo con las especificaciones del transformador.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ejemplo de c\u00e1lculo<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Selecciona un <strong>Transformador de 35\/10 kV<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Carga m\u00e1xima: <strong>3 500 kW<\/strong><\/li>\n\n\n\n<li>Factor de potencia: <strong>0.8<\/strong><\/li>\n\n\n\n<li>N\u00famero de transformadores: <strong>2<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C\u00e1lculo de la capacidad:<\/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{3500}{0,8} = 3062 \\text{ kVA}<\/annotation><\/semantics><\/math>S = 0,7 \u00d7 0,83500 = 3062 kVA<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selecci\u00f3n recomendada:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Potencia del transformador: 3150 kVA<\/strong><\/li>\n\n\n\n<li><strong>Relaci\u00f3n de tensi\u00f3n: 35 kV \/ 10,5 kV<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A continuaci\u00f3n, selecciona el modelo de transformador adecuado del cat\u00e1logo de productos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">F\u00f3rmula para calcular la capacidad de un transformador<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Paso 1: Calcular la potencia m\u00e1xima por fase<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suma la potencia de carga de cada fase por separado:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fase A: 10 kW<\/li>\n\n\n\n<li>Fase B: 9 kW<\/li>\n\n\n\n<li>Fase C: 11 kW<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Selecciona el <strong>carga m\u00e1xima de fase<\/strong>: <strong>11 kW<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Notas:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Equipos monof\u00e1sicos: Utiliza el <strong>potencia nominal m\u00e1xima<\/strong> seg\u00fan la placa de caracter\u00edsticas.<\/li>\n\n\n\n<li>Equipos trif\u00e1sicos: Dividir la potencia total entre <strong>3<\/strong> para obtener la potencia por fase.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ejemplo:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ordenadores: 300 W \u00d7 10 unidades<\/li>\n\n\n\n<li>Aires acondicionados: 2 kW \u00d7 4 unidades<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Carga total de la fase 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\">Paso 2: Calcular la potencia trif\u00e1sica total<\/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\">Paso 3: Calcular la potencia de entrada del transformador<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">La mayor\u00eda de los transformadores del mercado tienen un <strong>factor de potencia de aproximadamente 0,8<\/strong>, por lo que este paso es fundamental:<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\u200b = 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\">Paso 4: Calcular la capacidad necesaria del transformador<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Seg\u00fan el <em>Manual de dise\u00f1o de ingenier\u00eda el\u00e9ctrica<\/em>, el factor de carga del transformador se suele seleccionar en <strong>85%<\/strong> para cargas 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>Selecci\u00f3n final:<\/strong><br>Elige un <strong>Transformador de 50 kVA<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Aspectos clave sobre la capacidad nominal de los transformadores<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>La potencia nominal de un transformador es la <strong>potencia aparente m\u00e1xima (kVA)<\/strong> que garantiza un funcionamiento normal en las condiciones especificadas.<\/li>\n\n\n\n<li>Esta potencia aparente es la <strong>carga m\u00e1xima que el transformador puede suministrar de forma segura<\/strong>.<\/li>\n\n\n\n<li>En condiciones de funcionamiento nominal, <strong>La potencia aparente de salida es igual a la potencia nominal<\/strong>.<\/li>\n\n\n\n<li>La potencia aparente de entrada es <strong>ligeramente superior<\/strong> que la capacidad nominal debido a las p\u00e9rdidas.<\/li>\n\n\n\n<li>Dado que la eficiencia del transformador es muy alta, <strong>La potencia aparente de entrada suele estimarse como igual a la potencia nominal.<\/strong>, y esta suposici\u00f3n es aceptable en la pr\u00e1ctica de la ingenier\u00eda.<\/li>\n\n\n\n<li>Mientras el <strong>tensi\u00f3n de salida, corriente, factor de potencia y potencia aparente<\/strong> son iguales o inferiores a la capacidad nominal, el funcionamiento es seguro (en condiciones adecuadas).<\/li>\n\n\n\n<li>La creencia de que los transformadores deben funcionar <strong>por debajo del 90% de la capacidad nominal<\/strong> debido a las p\u00e9rdidas es <strong>incorrecto<\/strong>.<\/li>\n\n\n\n<li>Aplicar un <strong>margen de seguridad<\/strong> durante la selecci\u00f3n de la capacidad en funci\u00f3n de la carga calculada es <strong>correcto y recomendado<\/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. Resumen<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">El c\u00e1lculo de la capacidad de un transformador consiste en <strong>no es complicado<\/strong>, pero hay que prestar atenci\u00f3n a lo siguiente:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Precisi\u00f3n en el c\u00e1lculo de la carga<\/li>\n\n\n\n<li>Consideraciones sobre el factor de potencia<\/li>\n\n\n\n<li>M\u00e1rgenes de seguridad razonables<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Una selecci\u00f3n adecuada de la capacidad del transformador garantiza:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Funcionamiento seguro y estable<\/li>\n\n\n\n<li>Eficiencia \u00f3ptima<\/li>\n\n\n\n<li>Menores p\u00e9rdidas de energ\u00eda<\/li>\n\n\n\n<li>Mayor vida \u00fatil del transformador<\/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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