{"id":10898,"date":"2026-08-29T23:43:09","date_gmt":"2026-08-29T15:43:09","guid":{"rendered":"https:\/\/q8bbzjnpm5.wpdns.site\/?p=10898"},"modified":"2026-08-29T23:43:09","modified_gmt":"2026-08-29T15:43:09","slug":"scientific-methods-for-selecting-transformers-based-on-the-power-of-electrical-equipment","status":"publish","type":"post","link":"https:\/\/subian-electric.com\/ru\/news\/scientific-methods-for-selecting-transformers-based-on-the-power-of-electrical-equipment\/","title":{"rendered":"\u041d\u0430\u0443\u0447\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0432\u044b\u0431\u043e\u0440\u0430 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u043e\u0432 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438 \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e 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\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.<br \/>\n\u041f\u0443\u0441\u043a\u043e\u0432\u043e\u0439 \u0442\u043e\u043a \u0438\u0433\u043d\u043e\u0440\u0438\u0440\u0443\u0435\u0442\u0441\u044f. \u0411\u043e\u043b\u044c\u0448\u0438\u0435 \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0434\u0432\u0438\u0433\u0430\u0442\u0435\u043b\u0438 \u043c\u043e\u0433\u0443\u0442 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u044f\u0442\u044c \u0434\u043e \u0448\u0435\u0441\u0442\u0438 \u0440\u0430\u0437 \u0431\u043e\u043b\u044c\u0448\u0435 \u0441\u0432\u043e\u0435\u0433\u043e \u043d\u043e\u0440\u043c\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u043e\u043a\u0430 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435. \u042d\u0442\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435 \u043c\u043e\u0436\u0435\u0442 \u0443\u043f\u0430\u0441\u0442\u044c, \u0438 \u0440\u0435\u043b\u0435 \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u0442\u0441\u044f.<\/p>\n<p>\u0410\u043a\u0430\u0434\u0435\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u043e\u0434\u0445\u043e\u0434 \u2014 \u044d\u0442\u043e \u043c\u0435\u0442\u043e\u0434 \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0432\u0441\u0435\u0445 \u044d\u0444\u0444\u0435\u043a\u0442\u043e\u0432 \u0438 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f \u043e\u043a\u043e\u043d\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0435 \u0438\u043d\u0442\u0443\u0438\u0446\u0438\u0435\u0439, \u0430 \u0444\u0438\u0437\u0438\u043a\u043e\u0439.<\/p>\n<h2 id=\"power-conversion\">\u041e\u0442 \u043a\u0412\u0442 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u043a \u043a\u0412\u0410 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430<\/h2>\n<p>\u041e\u0441\u043d\u043e\u0432\u043d\u043e\u0435 \u0443\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435: \u043a\u0412\u0410 = \u043a\u0412\u0442 \u00f7 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438. \u0412 \u0441\u043b\u0443\u0447\u0430\u044f\u0445, \u043a\u043e\u0433\u0434\u0430 \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u044b \u0442\u0440\u0435\u0445\u0444\u0430\u0437\u043d\u044b\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u0438 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435, \u043c\u043e\u0436\u043d\u043e \u0442\u0430\u043a\u0436\u0435 \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u043a\u0412\u0410, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435 \u043a\u0412\u0410 = (\u221a3 \u00d7 V \u00d7 I) \u00f7 1000. \u041d\u0430 \u0442\u0430\u0431\u043b\u0438\u0447\u043a\u0435 \u043c\u0430\u0448\u0438\u043d\u044b \u0435\u0441\u0442\u044c \u0432\u0441\u044f \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f: \u043d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0435 \u043a\u0412\u0442, \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435, \u0442\u043e\u043a \u043f\u043e\u043b\u043d\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0438 \u0438\u043d\u043e\u0433\u0434\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438. \u0412\u044b \u0432\u0441\u0435\u0433\u0434\u0430 \u0434\u043e\u043b\u0436\u043d\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u0412\u0410 \u043e\u0442 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u043d\u043e\u0439 \u0448\u0438\u043d\u044b \u0432\u043c\u0435\u0441\u0442\u043e \u043a\u0412\u0410 \u0434\u043b\u044f \u043a\u0412\u0410 \u043d\u0430 \u043a\u043b\u0435\u043c\u043c\u0430\u0445 \u0434\u0432\u0438\u0433\u0430\u0442\u0435\u043b\u044f, \u0442\u0430\u043a \u043a\u0430\u043a \u044d\u0442\u043e \u0443\u0447\u0442\u0435\u0442 \u043b\u044e\u0431\u044b\u0435 \u043f\u043e\u0442\u0435\u0440\u0438 \u043f\u043e \u043b\u0438\u043d\u0438\u044f\u043c (\u043f\u043e\u0442\u0435\u0440\u0438 2-5% \u043d\u0430 \u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u0440\u0430\u0441\u0441\u0442\u043e\u044f\u043d\u0438\u044f\u0445).<\/p>\n<p>\u0414\u043b\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043e\u043a, \u0433\u0434\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u044c \u043c\u043e\u0442\u043e\u0440\u0430 \u0432 \u043b\u043e\u0448\u0430\u0434\u0438\u043d\u044b\u0445 \u0441\u0438\u043b\u0430\u0445, \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u044c \u0440\u0430\u0441\u0447\u0435\u0442\u044b, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043f\u0440\u0435\u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u0435 1 \u043b.\u0441. \u2248 0.746 \u043a\u0412\u0442 \u0438 \u0434\u0435\u043b\u0438\u0442\u044c \u0447\u0438\u0441\u043b\u043e \u043d\u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u043c\u043e\u0442\u043e\u0440\u0430 (\u043e\u0431\u044b\u0447\u043d\u043e \u043c\u0435\u0436\u0434\u0443 0.90 \u0438 0.95). \u0412 \u044d\u0442\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 100 \u043b.\u0441. \u043c\u043e\u0442\u043e\u0440 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u044f\u0435\u0442 100 \u00d7 0.746 \u00f7 0.93 \u00f7 0.85, \u0447\u0442\u043e \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 94 \u043a\u0412\u0410 \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0438 \u0432 \u043f\u044f\u0442\u044c-\u0432\u043e\u0441\u0435\u043c\u044c \u0440\u0430\u0437 \u0431\u043e\u043b\u044c\u0448\u0435 \u043f\u0440\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0435.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0422\u0438\u043f \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f<\/th>\n<th>\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438<\/th>\n<th>\u0422\u0438\u043f\u0438\u0447\u043d\u043e\u0435 \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u0438\u0435<\/th>\n<th>\u043a\u0412\u0410 \u043d\u0430 100 \u043a\u0412\u0442 \u043d\u043e\u043c\u0438\u043d\u0430\u043b\u0430<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0418\u043d\u0434\u0443\u043a\u0446\u0438\u043e\u043d\u043d\u044b\u0435 \u043c\u043e\u0442\u043e\u0440\u044b (\u043e\u0431\u0449\u0438\u0435)<\/td>\n<td>0.80\u20130.88<\/td>\n<td>0.70\u20130.85<\/td>\n<td>114\u2013125<\/td>\n<\/tr>\n<tr>\n<td>\u041c\u043e\u0442\u043e\u0440\u044b \u0441 \u043f\u0440\u0438\u0432\u043e\u0434\u043e\u043c VFD<\/td>\n<td>95 (\u0432\u0445\u043e\u0434)<\/td>\n<td>0.70\u20130.80<\/td>\n<td>105<\/td>\n<\/tr>\n<tr>\n<td>\u0420\u0435\u0437\u0438\u0441\u0442\u0438\u0432\u043d\u044b\u0439 \u043e\u0431\u043e\u0433\u0440\u0435\u0432 \/ \u043f\u0435\u0447\u0438<\/td>\n<td>1.00<\/td>\n<td>0.60\u20130.80<\/td>\n<td>100<\/td>\n<\/tr>\n<tr>\n<td>LED \u043e\u0441\u0432\u0435\u0449\u0435\u043d\u0438\u0435<\/td>\n<td>0.95\u20130.99<\/td>\n<td>0.80\u20130.90<\/td>\n<td>101\u2013105<\/td>\n<\/tr>\n<tr>\n<td>\u0421\u0432\u0430\u0440\u043e\u0447\u043d\u044b\u0435 \u043c\u0430\u0448\u0438\u043d\u044b<\/td>\n<td>0.45\u20130.70<\/td>\n<td>0.30\u20130.50<\/td>\n<td>143\u2013222<\/td>\n<\/tr>\n<tr>\n<td>\u041a\u043e\u043c\u043f\u0440\u0435\u0441\u0441\u043e\u0440\u044b (\u0432\u0438\u043d\u0442\u043e\u0432\u044b\u0435)<\/td>\n<td>0.82\u20130.90<\/td>\n<td>0.60\u20130.80<\/td>\n<td>111\u2013122<\/td>\n<\/tr>\n<tr>\n<td>\u041e\u0445\u043b\u0430\u0434\u0438\u0442\u0435\u043b\u0438 HVAC<\/td>\n<td>0.80\u20130.88<\/td>\n<td>0.70\u20130.90<\/td>\n<td>114\u2013125<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u041e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0441\u0432\u0430\u0440\u043e\u0447\u043d\u044b\u0439 \u0440\u044f\u0434: \u043d\u0438\u0437\u043a\u0438\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438 \u0438 \u043e\u0447\u0435\u043d\u044c \u043d\u0438\u0437\u043a\u043e\u0435 \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u0438\u0435 \u043e\u0437\u043d\u0430\u0447\u0430\u044e\u0442, \u0447\u0442\u043e \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440 \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043d \u043d\u0430 \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u043a\u0412\u0410 \u043d\u0430 \u043a\u0412\u0442, \u0434\u0430\u0436\u0435 \u0435\u0441\u043b\u0438 \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0435 \u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435 \u043d\u0435\u0432\u0435\u043b\u0438\u043a\u043e. \u0412\u043e\u0442 \u043f\u043e\u0447\u0435\u043c\u0443 \u043e\u0431\u0449\u0438\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u0430 \u043d\u0435 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0442 \u2014 \u043d\u0430\u0443\u0447\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0432\u0441\u0435\u0433\u0434\u0430 \u043e\u0441\u043d\u043e\u0432\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430 \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0430\u0445 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u044f.<\/p>\n<h2 id=\"demand-factors\">\u0424\u0430\u043a\u0442\u043e\u0440\u044b \u0441\u043f\u0440\u043e\u0441\u0430, \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u0438\u044f \u0438 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f<\/h2>\n<p>\u0424\u0430\u043a\u0442\u043e\u0440\u044b \u0441\u043f\u0440\u043e\u0441\u0430, \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u0438\u044f \u0438 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u043e\u0431\u044a\u044f\u0441\u043d\u044f\u044e\u0442 \u043e\u0434\u043d\u0443 \u0438 \u0442\u0443 \u0436\u0435 \u0432\u0437\u0430\u0438\u043c\u043e\u0441\u0432\u044f\u0437\u044c \u043c\u0435\u0436\u0434\u0443 \u0442\u0435\u043c, \u043a\u0430\u043a \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438 \u0434\u0435\u0439\u0441\u0442\u0432\u0443\u044e\u0442 \u043d\u0430 \u0448\u0438\u043d\u0430\u0445 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430.<\/p>\n<p>\u041a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0441\u043f\u0440\u043e\u0441\u0430 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043f\u0440\u043e\u0441, \u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u043d\u0443\u044e \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0443 \u0434\u043b\u044f \u0433\u0440\u0443\u043f\u043f\u044b, \u0438 \u043e\u0431\u044b\u0447\u043d\u043e \u043c\u0435\u043d\u044c\u0448\u0435 \u0435\u0434\u0438\u043d\u0438\u0446\u044b, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0430, \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0438\u043b\u043e, \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0438\u0436\u0435 \u043f\u043e\u043b\u043d\u043e\u0439 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u0438.<\/p>\n<p>\u041a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u0438\u044f \u0438\u0437\u0432\u0435\u0441\u0442\u0435\u043d \u043a\u0430\u043a \u043e\u0431\u0449\u0438\u0439 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043f\u0440\u043e\u0441, \u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043e\u0432\u043f\u0430\u0434\u0430\u044e\u0449\u0438\u0439 \u0441\u043f\u0440\u043e\u0441, \u0438 \u043e\u0431\u044b\u0447\u043d\u043e \u0431\u043e\u043b\u044c\u0448\u0435 \u0435\u0434\u0438\u043d\u0438\u0446\u044b.<\/p>\n<p>\u041a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u043f\u043e\u0445\u043e\u0436 \u043d\u0430 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0440\u0430\u0437\u043d\u043e\u043e\u0431\u0440\u0430\u0437\u0438\u044f, \u0442\u0430\u043a \u043a\u0430\u043a \u043e\u043d \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442 \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438, \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0435\u0439 \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u043e, \u0438 \u043e\u0431\u044b\u0447\u043d\u043e \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d\u0435 \u043e\u0442 0.5 \u0434\u043e 0.9.<\/p>\n<p>\u0418\u043d\u0436\u0435\u043d\u0435\u0440\u044b \u043e\u0431\u044b\u0447\u043d\u043e \u043a\u043e\u043c\u0431\u0438\u043d\u0438\u0440\u0443\u044e\u0442 \u043e\u0434\u0438\u043d \u0438\u0437 \u044d\u0442\u0438\u0445 \u0444\u0430\u043a\u0442\u043e\u0440\u043e\u0432 \u0441 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e\u043c \u043a\u0412\u0410, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u044d\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u044f\u0441\u043d\u043e\u043c\u0443 \u043f\u0440\u0438\u043c\u0435\u0440\u0443 \u0442\u043e\u0433\u043e, \u043a\u0430\u043a \u043d\u0430\u0439\u0442\u0438 \u043e\u0431\u0449\u0443\u044e \u0441\u0443\u043c\u043c\u0443 \u043f\u0440\u043e\u0435\u043a\u0442\u043d\u043e\u0433\u043e \u0441\u043f\u0440\u043e\u0441\u0430 \u0432 \u0442\u0435\u0440\u043c\u0438\u043d\u0430\u0445 \u044d\u043a\u043e\u043d\u043e\u043c\u0438\u0438 \u043d\u0430 \u043f\u043e\u0442\u0435\u0440\u044f\u0445 \u0438 \u043f\u043e\u043a\u0443\u043f\u043a\u0435 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430.<br \/>\n\u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u043d\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0435 500 \u043a\u0412\u0410 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442\u0430 \u0441\u043f\u0440\u043e\u0441\u0430 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 0.9, \u0430 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442\u0430 \u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u2014 0.8, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u043f\u0440\u043e\u0435\u043a\u0442\u043d\u044b\u0439 \u0441\u043f\u0440\u043e\u0441 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 500 x 0.9 x 0.8 = 360 \u043a\u0412\u0410.<\/p>\n<h2 id=\"starting-current\">\u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u043c\u043e\u0442\u043e\u0440\u0430<\/h2>\n<p>\u0421\u0442\u0430\u0440\u0442\u043e\u0432\u044b\u0439 \u0442\u043e\u043a \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0437\u0432\u0435\u0441\u0442\u0435\u043d \u043a\u0430\u043a \u0442\u0438\u0445\u0438\u0439 \u0443\u0431\u0438\u0439\u0446\u0430, \u043a\u043e\u0433\u0434\u0430 \u0440\u0435\u0447\u044c \u0438\u0434\u0435\u0442 \u043e \u043c\u0430\u043b\u044b\u0445 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430\u0445. \u0414\u043b\u044f \u043c\u043e\u0442\u043e\u0440\u0430 \u043c\u043e\u0449\u043d\u043e\u0441\u0442\u044c\u044e 150 \u043a\u0412\u0442 \u043f\u0440\u044f\u043c\u043e\u0439 \u043f\u0443\u0441\u043a \u0442\u0440\u0435\u0431\u0443\u0435\u0442 \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u043e\u0433\u043e \u0442\u043e\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0432 5-7 \u0440\u0430\u0437 \u0431\u043e\u043b\u044c\u0448\u0435 \u0442\u043e\u043a\u0430 \u043f\u043e\u043b\u043d\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438, \u0438 \u0434\u043b\u0438\u0442\u0441\u044f \u043e\u0442 3 \u0434\u043e 10 \u0441\u0435\u043a\u0443\u043d\u0434. \u042d\u0442\u043e \u0434\u043e\u043b\u0436\u043d\u043e \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442\u044c, \u043f\u043e\u043a\u0430 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u044b\u0439 \u043a\u0412\u0410 \u0438 \u043e\u0441\u0442\u0430\u043b\u044c\u043d\u0443\u044e \u0447\u0430\u0441\u0442\u044c \u0441\u0432\u043e\u0435\u0433\u043e \u0442\u043e\u043a\u0430 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438, \u0432 \u0434\u043e\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a \u043f\u043e\u043f\u044b\u0442\u043a\u0430\u043c \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0438\u0442\u044c \u043f\u0440\u043e\u0432\u0430\u043b\u044b \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u044f \u043d\u0430 \u043a\u043b\u0435\u043c\u043c\u0430\u0445 \u043c\u043e\u0442\u043e\u0440\u0430 \u0434\u043e \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 10 \u0434\u043e 15%, \u0447\u0442\u043e\u0431\u044b \u043a\u043e\u043d\u0442\u0430\u043a\u0442\u043e\u0440 \u043d\u0435 \u043e\u0442\u043a\u043b\u044e\u0447\u0438\u043b\u0441\u044f.<\/p>\n<p>\u041e\u0434\u043d\u043e \u0438\u0437 \u0442\u0440\u0435\u0445 \u0440\u0435\u0448\u0435\u043d\u0438\u0439, \u043e\u0431\u0441\u0443\u0436\u0434\u0430\u0435\u043c\u044b\u0445 \u0437\u0434\u0435\u0441\u044c, \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0440\u0435\u0448\u0438\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c. \u041c\u044f\u0433\u043a\u0438\u0435 \u0441\u0442\u0430\u0440\u0442\u0435\u0440\u044b \u043f\u043e\u043c\u043e\u0433\u0430\u044e\u0442 \u0441\u043d\u0438\u0437\u0438\u0442\u044c \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u044b\u0435 \u0442\u043e\u043a\u0438 \u0434\u043e 2-3 \u0440\u0430\u0437 \u0431\u043e\u043b\u044c\u0448\u0435 \u0442\u043e\u043a\u0430 \u043f\u043e\u043b\u043d\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438. VFD \u0443\u043c\u0435\u043d\u044c\u0448\u0430\u044e\u0442 \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u044b\u0439 \u0442\u043e\u043a \u0434\u043e \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e 1.2-1.5 \u0440\u0430\u0437. \u0417\u0432\u0435\u0437\u0434\u043d\u043e-\u0442\u0440\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u044b\u0439 \u043f\u0443\u0441\u043a \u0441\u043d\u0438\u0436\u0430\u0435\u0442 \u0435\u0433\u043e \u0434\u043e 33% \u043f\u0440\u044f\u043c\u043e\u0433\u043e \u043f\u0443\u0441\u043a\u0430, \u043d\u043e \u044d\u0442\u043e\u0442 \u043c\u0435\u0442\u043e\u0434 \u0438\u043c\u0435\u0435\u0442 \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u043d\u044b\u0439 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442. \u0427\u0430\u0441\u0442\u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440 \u043d\u0430 \u043e\u0434\u043d\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435, \u0435\u0441\u043b\u0438 \u043c\u043e\u0436\u043d\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u044b\u0439 \u0442\u043e\u043a. \u0415\u0441\u043b\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u0435\u043d \u0438 \u0435\u0441\u043b\u0438 \u0432 \u0443\u0447\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u0438 \u0435\u0441\u0442\u044c \u0431\u043e\u043b\u044c\u0448\u0438\u0435 \u043c\u043e\u0442\u043e\u0440\u044b \u0441 \u0444\u0438\u043a\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c\u044e, \u0442\u043e \u0440\u0430\u0437\u043c\u0435\u0440 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430 \u0434\u043e\u043b\u0436\u0435\u043d \u043e\u0441\u043d\u043e\u0432\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u043d\u0430 \u0441\u0442\u0430\u0440\u0442\u043e\u0432\u043e\u043c \u0442\u043e\u043a\u0435, \u0430 \u043d\u0435 \u043d\u0430 \u043a\u0430\u043a\u043e\u0439-\u043b\u0438\u0431\u043e \u0440\u0430\u0431\u043e\u0447\u0435\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0435.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u041c\u0435\u0442\u043e\u0434 \u0437\u0430\u043f\u0443\u0441\u043a\u0430<\/th>\n<th>\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0439 \u043f\u0443\u0441\u043a\u043e\u0432\u043e\u0439 \u0442\u043e\u043a (% \u043e\u0442 \u043f\u043e\u043b\u043d\u043e\u0439 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u0438)<\/th>\n<th>\u0412\u043b\u0438\u044f\u043d\u0438\u0435 \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0442\u043e\u0440\u0430<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Direct-on-line (DOL)<\/td>\n<td>500\u2013700%<\/td>\n<td>Significant \u2014 may add one rating step<\/td>\n<\/tr>\n<tr>\n<td>Star-delta<\/td>\n<td>~170\u2013230%<\/td>\n<td>\u0423\u043c\u0435\u0440\u0435\u043d\u043d\u043e\u0435<\/td>\n<\/tr>\n<tr>\n<td>Soft starter<\/td>\n<td>200\u2013300%<\/td>\n<td>\u0423\u043c\u0435\u0440\u0435\u043d\u043d\u043e\u0435<\/td>\n<\/tr>\n<tr>\n<td>VFD<\/td>\n<td>120\u2013150%<\/td>\n<td>Minimal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The engineering rule of thumb: if the largest motor exceeds 25% of the transformer rating, verify the starting scenario explicitly with a voltage-drop calculation. If it exceeds 50%, expect to either bump the rating or change the starting method \u2014 the arithmetic is in IEC 60076-7 and IEEE C57.12.00 guidance on cyclic and short-time loading.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10901\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/How-to-size-a-transformer-scientifically.webp\" alt=\"\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"worked-examples\">Worked Examples Across Industries<\/h2>\n<p>Example A &#8211; Textiles Mill. Connected load = 12 looms (15 kW each (PF = 0.83)) + 3 compressors (30 kW each (PF = 0.85)) + 40 kW lighting (PF = 0.95) + 20 kW HVAC. Running kVA = 12 * 18.1 + 3 * 35.3 + 42 + 21 = ~ 345 kVA. Demand factor = 0.9 and coincidence (CF) = 0.8 -&gt; 345 * 0.9 * 0.8 = 248 kVA. With a growth of 15%, the power rating required = 285 kVA or standard rating of 315 kVA. Largest single load is 35 kVA (about 11% of the rating) thus no restrictions start-up.<\/p>\n<p>Example B &#8211; Food Processing Plant. Cooling compressor (100 kW) (6\u00d7 start\/ PF = 0.85), machinery (60 kW), CIP pump (30 kW) and lighting (25 kW). Running kVA = 118 + 71 + 35 + 26 = 250 kVA and coincidence factor (CF) = 0.75 -&gt; the power required = 188 kVA. During start-up, the cooling compressor momentarily has a power demand of about 6 x 118 = 708 kVA for 5 seconds. Design condition: 188 + (708 &#8211; 118) = ~ 778 kVA momentarily. 315 kVA unit could not withstand that, the practical solution is 630 kVA unit and\/or soft starting.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0421\u0446\u0435\u043d\u0430\u0440\u0438\u0439<\/th>\n<th>Naive kW Sum<\/th>\n<th>Scientific kVA Result<\/th>\n<th>Difference<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Textile mill (Example A)<\/td>\n<td>270 kVA<\/td>\n<td>315 \u043a\u0412\u0410<\/td>\n<td>+17%<\/td>\n<\/tr>\n<tr>\n<td>Food plant (Example B)<\/td>\n<td>250 \u043a\u0412\u0410<\/td>\n<td>630 \u043a\u0412\u0410<\/td>\n<td>+152%<\/td>\n<\/tr>\n<tr>\n<td>Warehouse lighting + HVAC<\/td>\n<td>150 kVA<\/td>\n<td>160 kVA<\/td>\n<td>+7%<\/td>\n<\/tr>\n<tr>\n<td>Machine shop with 50 kW lathes<\/td>\n<td>300 kVA<\/td>\n<td>400 \u043a\u0412\u0410<\/td>\n<td>+33%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The pattern is clear: the more motors and the larger the largest motor, the bigger the gap between naive and scientific sizing. The scientific method is not about inflating every number \u2014 it is about finding the true constraint, which is sometimes capacity and sometimes starting current.<\/p>\n<h2 id=\"standard-ratings\">Standard Ratings and the Sizing Table<\/h2>\n<p>After computing design demand, select the next standard IEC 60076-1 rating. Standard kVA values include 25, 50, 100, 160, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, and 3150. Custom ratings exist but cost 15\u201330% more and lengthen lead time because cores and tanks are non-standard.<\/p>\n<table>\n<thead>\n<tr>\n<th>Equipment Connected (kVA, diversified)<\/th>\n<th>Add Growth (15%)<\/th>\n<th>\u0420\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0443\u0435\u043c\u044b\u0439 \u043d\u043e\u043c\u0438\u043d\u0430\u043b<\/th>\n<th>\u0422\u0438\u043f\u0438\u0447\u043d\u044b\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0446\u0435\u043d<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Up to 85<\/td>\n<td>98<\/td>\n<td>100<\/td>\n<td>$2,500\u2013$6,000<\/td>\n<\/tr>\n<tr>\n<td>86\u2013135<\/td>\n<td>155<\/td>\n<td>160<\/td>\n<td>$3,500\u2013$8,000<\/td>\n<\/tr>\n<tr>\n<td>136\u2013215<\/td>\n<td>247<\/td>\n<td>250<\/td>\n<td>$4,500\u2013$11,000<\/td>\n<\/tr>\n<tr>\n<td>216\u2013270<\/td>\n<td>310<\/td>\n<td>315<\/td>\n<td>$6,000\u2013$13,000<\/td>\n<\/tr>\n<tr>\n<td>271\u2013430<\/td>\n<td>495<\/td>\n<td>500<\/td>\n<td>$8,000\u2013$16,000<\/td>\n<\/tr>\n<tr>\n<td>431\u2013545<\/td>\n<td>627<\/td>\n<td>630<\/td>\n<td>$10,000\u2013$20,000<\/td>\n<\/tr>\n<tr>\n<td>546\u2013870<\/td>\n<td>1,000<\/td>\n<td>1,000<\/td>\n<td>$15,000\u2013$32,000<\/td>\n<\/tr>\n<tr>\n<td>871\u20131,090<\/td>\n<td>1,254<\/td>\n<td>1,250<\/td>\n<td>$20,000\u2013$40,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Prices are indicative FOB China for oil-immersed units and vary by specification, brand, and region. The cost of stepping up one rating \u2014 say from 500 to 630 kVA \u2014 is typically 15\u201325% of the unit price, while an undersized transformer&#8217;s failure costs 100% plus downtime. The headroom is cheap.<\/p>\n<h2>Supporting Specifications: Voltage, Losses, Enclosure<\/h2>\n<p>Once kVA is established, the rest of the parameters are determined scientifically instead of with arbitrary guesswork. From the customer\u2019s system design, voltage ratio is determined: the primary voltage is either 11, 22, 33, or 35 kV (i.e. the voltage at which electricity enters customer\u2019s premises), and secondary voltage equals either 400, 415, or 480 V (utilization voltage). Vector group is based on the earthing system pattern and should be Dyn11 for grounded star low-voltage use, and normally Yd11 (from where the voltage is increased, low-voltage current less than 5% in the former system) or Yd1 for the respective high-voltage case. Impedance (uk%) is used to obtain fault coordination: 4% (for smaller distribution transformers), from 5% to 6% (for power rating 630-1250 kVA), and higher than that for power rating over 1250 kVA or as it is required by grid codes.<\/p>\n<p>Losses are the dominant cost over a period of 30 years. It would be crucial to state guaranteed no-load losses and guaranteed load losses in accordance with IEC 60076-1 standards and compare the total costs of ownership against competitors. Thus, for instance, a transformer of 1,000 kVA with amorphous core that saves 600 W of no-load losses saves quite an amount of electricity (almost $2,000 in 15 years at rate of 0.1 USD per one kWh) that makes it reasonable to pay for the difference. Further, enclosure should be chosen according to the conditions of environment (IP rating): IP54 for oil-immersed in the open air, IP21 to IP44 for dry type indoors, and IP56 for washdown applications.<\/p>\n<h2 id=\"brands-prices\">Brands and Price Ranges by Rating<\/h2>\n<p>Brand choice is the commercial layer on top of the technical calculation. For the same scientific specification, prices diverge by a factor of two to three depending on brand positioning and documentation quality.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0411\u0440\u0435\u043d\u0434<\/th>\n<th>\u041f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c<\/th>\n<th>250 kVA Price<\/th>\n<th>630 kVA Price<\/th>\n<th>1,250 kVA Price<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ABB<\/td>\n<td>Global service, full range<\/td>\n<td>$12,000\u2013$20,000<\/td>\n<td>$22,000\u2013$38,000<\/td>\n<td>$38,000\u2013$60,000<\/td>\n<\/tr>\n<tr>\n<td>\u0421\u0438\u043c\u0435\u043d\u0441<\/td>\n<td>Efficiency, digital monitoring<\/td>\n<td>1\u0422\u041f4\u042212,000\u20131\u0422\u041f4\u042222,000<\/td>\n<td>$24,000\u2013$40,000<\/td>\n<td>$40,000\u2013$65,000<\/td>\n<\/tr>\n<tr>\n<td>Schneider Electric<\/td>\n<td>Dry-type and LV integration<\/td>\n<td>$11,000\u2013$18,000<\/td>\n<td>$20,000\u2013$34,000<\/td>\n<td>$35,000\u2013$55,000<\/td>\n<\/tr>\n<tr>\n<td>Hitachi Energy<\/td>\n<td>Grid assets, power transformers<\/td>\n<td>$12,000\u2013$21,000<\/td>\n<td>$23,000\u2013$38,000<\/td>\n<td>$39,000\u2013$62,000<\/td>\n<\/tr>\n<tr>\n<td>\u0418\u0442\u043e\u043d<\/td>\n<td>North America compliance<\/td>\n<td>$10,000\u2013$17,000<\/td>\n<td>$18,000\u2013$32,000<\/td>\n<td>$32,000\u2013$52,000<\/td>\n<\/tr>\n<tr>\n<td>CG Power \/ TBEA<\/td>\n<td>Volume pricing<\/td>\n<td>$7,000\u2013$12,000<\/td>\n<td>$13,000\u2013$22,000<\/td>\n<td>$24,000\u2013$40,000<\/td>\n<\/tr>\n<tr>\n<td>Jiangsu Subian Electric Power<\/td>\n<td>IEC 60076, test reports, copper<\/td>\n<td>$6,000\u2013$11,000<\/td>\n<td>$11,000\u2013$20,000<\/td>\n<td>$20,000\u2013$36,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The global companies talked about above achieved their status through years of work and contribution for the energy sector and other critical areas. However, the same approach will not work for industrial plants, warehouses, and renewable energy installations, where you are already protected by scientific specifications. Jiangsu Subian Electric Power produces IEC 60076-certified transformers in the range of 10 kVA to 100 MVA and provides copper-wound transformers as a standard product, and all the items come with a report proving that the losses and parameters you needed for the transformer correspond to the item delivered. In the case of transformers where the calculations show some specific rating, it is easy to assess the level of work done by suppliers. Rather than asking customers to trust what is written in brochures, Subian shares proofs of its claims.<\/p>\n<h2 id=\"selection-formula\">The Complete Selection Formula and Checklist<\/h2>\n<p>In summary, the calculation for sizing transformers based on the equipment-power selection formula is:<\/p>\n<p>The design kVA set = Sum (load_kVA \u00d7 demand factor) \u00d7 coincidence factor \u00d7 (1 + growth margin)<\/p>\n<p>and then the two criteria of achievable loads: sustained load \u2264 rating (oil\/dry) in 80\u201390%, and starting transient takes place within the short-duration capability limit of the unit as per IEC 60076-7. The checklist will consist of the following operations:<\/p>\n<p>Compile the list of machines with kW, PF, and full load current parameters.<br \/>\nConvert to kVA per apparatus and classify by feeder.<br \/>\nApply demand and coincidence packages per group.<br \/>\nVerify the maximum starting demand of the motor against the rating.<br \/>\nAdd 10\u201320% margin of growth and round to a standard rating.<br \/>\nSpecify voltage, vector group, impedance, losses, and enclosure.<br \/>\nCompare bidders based on their performances and TCO requirements.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10900\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Load-Types-Starting-current-Buyer-checklist.webp\" alt=\"\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"faq\">\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n<h3>How do I size a transformer from the equipment&#8217;s kW rating?<\/h3>\n<p>The kW of each load should be divided by its power factor so that you may convert it to kVA, sum them up to get the total, and then you must apply the demand factor (around 0.9 for most machines) and the coincidence factor (between 0.7 and 0.85), make sure to account for about 10-20 percent growth in total and round it to the next standard rating. For instance, 180 kW at PF of 0.85 equals to 212 kVA, applying coincidence of 0.85 and 15 percent growth, we get the design demand of approximately 207 kVA which implies that we have to use a 250 kVA machine.<\/p>\n<h3>What is the rule of thumb for transformer sizing from load?<\/h3>\n<p>A common first-pass rule is that the transformer should be rated 1.2\u20131.5\u00d7 the expected maximum kW demand, depending on power factor and future growth. It is a screening tool only. The scientific method always wins where motors are large, power factors are low, or harmonics are present \u2014 use the formula above, not the rule, for the final decision.<\/p>\n<h3>Why is the transformer rating bigger than the sum of my equipment?<\/h3>\n<p>Three reasons: power factor (kVA &gt; kW), starting current (a 100 kW motor can demand 600+ kVA for seconds), and future growth (which you always add). If your equipment runs at 0.8 PF with a large DOL motor, a rating 25\u201360% above the naive kW sum is normal \u2014 the food-plant example in this guide needed 152% more.<\/p>\n<h3>Can I oversize a transformer for future expansion?<\/h3>\n<p>Yes, and it is usually wise \u2014 but only within reason. A 10\u201320% margin costs 15\u201325% more per step up and slightly raises no-load losses, which run 24\/7. Oversizing beyond about 40% wastes capital and energy unless you are certain the load will arrive within 2\u20133 years. The scientific answer: match the margin to the actual expansion plan.<\/p>\n<h3>How much does it cost to upgrade the transformer rating one step?<\/h3>\n<p>Moving from 500 to 630 kVA typically adds $2,000\u2013$4,000 (about 15\u201325%) for the unit itself; moving from 1,000 to 1,250 kVA adds $4,000\u2013$8,000. Against that, an undersized transformer that fails in service costs $8,000\u2013$30,000 in replacement plus production downtime. The upgrade premium is the cheapest insurance in the project.<\/p>\n<h2 id=\"references\">\u0421\u0441\u044b\u043b\u043a\u0438<\/h2>\n<ul>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/200\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1: Power Transformers \u2014 General<\/a> \u2014 the standard for ratings, tolerances, and routine testing.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/57088\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-7: Loading Guide for Oil-Immersed Power Transformers<\/a> \u2014 short-time and cyclic loading limits for starting transients.<\/li>\n<li><a href=\"https:\/\/standards.ieee.org\/ieee\/C57.12.00\/6735\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00: General Requirements for Liquid-Immersed Transformers<\/a> \u2014 North American rating and testing framework.<\/li>\n<li><a href=\"https:\/\/www.electrical4u.com\/transformer-sizing\/\" rel=\"nofollow noopener\" target=\"_blank\">Electrical4U \u2014 Transformer Sizing<\/a> \u2014 worked sizing examples and demand-factor guidance.<\/li>\n<li><a href=\"https:\/\/www.eaton.com\/us\/en-us\/products\/transformers\/transformer-consultant.html\" rel=\"nofollow noopener\" target=\"_blank\">Eaton \u2014 Transformer Consultant<\/a> \u2014 engineering tools for kVA calculation and selection.<\/li>\n<li><a href=\"https:\/\/www.fluke.com\/en-us\/learn\/blog\/power-quality\/power-factor\" rel=\"nofollow noopener\" target=\"_blank\">Fluke \u2014 Understanding Power Factor<\/a> \u2014 a practical reference for power factor and demand measurement.<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Demand_factor\" rel=\"nofollow noopener\" target=\"_blank\">Wikipedia \u2014 Demand Factor<\/a> \u2014 definition and application of demand, diversity, and coincidence factors.<\/li>\n<\/ul>\n<h2 id=\"conclusion\">\u0417\u0430\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0435<\/h2>\n<p>Scientific transformer selection based on equipment power is simply the discipline of converting kW to kVA with the right power factor, accounting for demand and coincidence, respecting motor starting transients, and adding an honest growth margin. The arithmetic is not hard \u2014 but skipping any term produces a unit that either fails under starting load or wastes capital on idle capacity. The food-plant example proved the cost of shortcuts: a naive 250 kVA estimate versus a correct 630 kVA.<\/p>\n<ul>\n<li>Always convert kW to kVA using the real power factor \u2014 never sum kW directly.<\/li>\n<li>Apply demand and coincidence factors, and check the largest motor&#8217;s starting demand.<\/li>\n<li>Add 10\u201320% growth and round up to a standard IEC 60076 rating.<\/li>\n<li>Demand factory test reports so the specified losses and impedance are verified.<\/li>\n<\/ul>\n<p>When your equipment-power calculation is done and the rating is set, <a href=\"https:\/\/subian-electric.com\/ru\/\">Jiangsu Subian Electric Power<\/a> will quote an IEC 60076-certified transformer from 10 kVA to 100 MVA against your spec \u2014 with the factory test report attached so the number on the nameplate is the number you sized for.<\/p>","protected":false},"excerpt":{"rendered":"<p>A textile factory in Vietnam was about to put into operation twelve weaving machines with 15 kW ratting each. The conclusion of the owner was pretty simple: twelve machines multiplied by 15 kW gives 180 kW, consequently, a 200 kVA transformer is needed. At that point, the electrical contractor cancelled the order. In reality, each [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":10899,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[77],"tags":[],"class_list":["post-10898","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/posts\/10898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/comments?post=10898"}],"version-history":[{"count":2,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/posts\/10898\/revisions"}],"predecessor-version":[{"id":11007,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/posts\/10898\/revisions\/11007"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/media\/10899"}],"wp:attachment":[{"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/media?parent=10898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/categories?post=10898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subian-electric.com\/ru\/wp-json\/wp\/v2\/tags?post=10898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}