{"id":10969,"date":"2026-08-29T23:43:05","date_gmt":"2026-08-29T15:43:05","guid":{"rendered":"https:\/\/q8bbzjnpm5.wpdns.site\/?p=10969"},"modified":"2026-08-29T23:43:05","modified_gmt":"2026-08-29T15:43:05","slug":"the-function-of-transformers-powering-your-world-safely-and-efficiently","status":"publish","type":"post","link":"https:\/\/subian-electric.com\/ko\/news\/the-function-of-transformers-powering-your-world-safely-and-efficiently\/","title":{"rendered":"\ubcc0\uc555\uae30\uc758 \uae30\ub2a5: \uadc0\ud558\uc758 \uc138\uacc4\uc5d0 \uc548\uc804\ud558\uace0 \ud6a8\uc728\uc801\uc73c\ub85c \uc804\ub825\uc744 \uacf5\uae09\ud558\uae30"},"content":{"rendered":"<p>\uc1fc\ud551\ubab0\uc774\ub098 \ub370\uc774\ud130 \uc13c\ud130\uc5d0 \uc788\uace0 \ucf00\uc774\ube14\uc5d0\uc11c \uba87 \ud53c\ud2b8 \ub5a8\uc5b4\uc838 \uc788\ub2e4\uba74, \uac74\ubb3c\uc744 \uc11c\ube44\uc2a4\ud558\ub294 \ud328\ub4dc \uc7a5\ucc29 \uc7a5\ube44\uc640 11 kV\ub97c 400 kV\ub85c \ubcc0\ud658\ud558\ub294 \uac74\uc2dd \ubcc0\uc555\uae30\ub77c\ub294 \ub450 \uac00\uc9c0 \uc8fc\uc694 \uc720\ud615\uc758 \ubcc0\uc555\uae30\ub97c \uc9c0\ub098\uce58\uac8c \ub420 \uac83\uc774\uba70, \uc774\ub97c \uc778\uc2dd\ud558\uc9c0 \ubabb\ud560 \uac83\uc785\ub2c8\ub2e4. \uc804\uae30\ub85c \uc791\ub3d9\ud558\ub294 \ubaa8\ub4e0 \uac83\uc740 \ubcc0\uc555\uae30\uc5d0 \uc758\uc874\ud558\uc5ec \uc804\uc555\uc744 \ubcc0\ud658\ud558\ub294 \uac00\uc7a5 \uc911\uc694\ud55c \uae30\ub2a5 \uc911 \ud558\ub098\ub97c \uc218\ud589\ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n<p>\uc774 \uae30\uc0ac\uc5d0\uc11c\ub294 \ubcc0\uc555\uae30\uc758 \uc791\ub3d9 \uc6d0\ub9ac\ub97c \uac04\ub2e8\ud558\uace0 \uba85\ud655\ud558\uac8c \uc124\uba85\ud558\uba70, \uc804\uc555 \ubcc0\ud658, \uc808\uc5f0, \uc784\ud53c\ub358\uc2a4 \ub9e4\uce6d \ubc0f \uc870\uc815\uacfc \uac19\uc740 \uacfc\uc815\uc5d0 \ub300\ud55c \uc801\uc808\ud55c \uc218\uce58\ub97c \uc81c\uacf5\ud558\uc5ec \ubcc0\uc555\uae30\uc5d0 \ub300\ud55c \uc9c0\uc2dd\uc774 \ub2e4\uc591\ud55c \uc0b0\uc5c5\uc758 \uc804\uae30\uc801 \uc694\uad6c\ub97c \uc720\uc9c0\ud558\ub294 \ub370 \ub3c4\uc6c0\uc774 \ub420 \uc218 \uc788\uc74c\uc744 \ubcf4\uc5ec\uc904 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10971\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/From-Power-Plant-to-End-Use.webp\" alt=\"\" width=\"1440\" height=\"1080\" \/><\/p>\n<h2 id=\"definition\">\ubcc0\uc555\uae30\ub780 \ubb34\uc5c7\uc774\uba70 \uc2e4\uc81c\ub85c \ubb34\uc5c7\uc744 \ud558\ub294\uac00?<\/h2>\n<p>\ubcc0\uc555\uae30\ub294 \uacf5\uc720\ub41c \uc790\uae30 \ucf54\uc5b4 \uc8fc\uc704\uc5d0 \ubc30\uce58\ub41c \ud2b9\uc815 \uc218\uc758 \ucf54\uc77c(\uc885\uc885 \uad8c\uc120\uc774\ub77c\uace0 \ud568)\ub85c \uad6c\uc131\ub41c \uc815\uc801 \uc7a5\uce58\uc785\ub2c8\ub2e4. \ubcf8\uc9c8\uc801\uc73c\ub85c \ubcc0\uc555\uae30\uc758 \uc8fc\uc694 \ubaa9\uc801\uc740 \uad50\ub958(AC)\uc758 \uc5d0\ub108\uc9c0\ub97c \ud55c \ud68c\ub85c\uc5d0\uc11c \ub2e4\ub978 \ud68c\ub85c\ub85c \uc804\uc1a1\ud558\uba74\uc11c \uc804\uc555\uacfc \uc804\ub958 \uc218\uc900\uc744 \ubcc0\uacbd\ud558\uace0 \uc8fc\ud30c\uc218\ub294 \ub3d9\uc77c\ud558\uac8c \uc720\uc9c0\ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \ub530\ub77c\uc11c \ubcc0\uc555\uae30\ub294 \uc791\ub3d9 \uc911\uc5d0 \uc774\ub3d9 \ubd80\ud488\uc774 \uc5c6\uae30 \ub54c\ubb38\uc5d0 \ub9e4\uc6b0 \uc2e0\ub8b0\ud560 \uc218 \uc788\ub294 \uc804\uae30 \uc7a5\uce58\uc785\ub2c8\ub2e4.<\/p>\n<p>\ubcc0\uc555\uae30\uc758 \uc774\ub984\uc740 \uc804\uc555\uc744 \ubcc0\ud658\ud558\ub294 \uc791\ub3d9\uc5d0\uc11c \uc720\ub798\ud569\ub2c8\ub2e4. \uc77c\ubc18\uc801\uc73c\ub85c \uc2b9\uc555\ud615 \ubcc0\uc555\uae30\ub294 \ud6a8\uc728\uc801\uc778 \uc7a5\uac70\ub9ac \uc804\ub825 \uacf5\uae09\uc744 \uc704\ud574 \uc804\uc555\uc744 \uc99d\uac00\uc2dc\ud0a4\uace0, \uac15\uc555\ud615 \ubcc0\uc555\uae30\ub294 \uc804\uc555\uc744 \uac10\uc18c\uc2dc\ud0a4\ub294 \ub370 \ub3c4\uc6c0\uc744 \uc90d\ub2c8\ub2e4. \uadf8\ub7ec\ub098 \uc804\uc555\uc744 \ubcc0\uacbd\ud558\ub294 \uac83\uc740 \ubcc0\uc555\uae30\uac00 \ud560 \uc218 \uc788\ub294 \uc77c\uc758 \uc791\uc740 \ubd80\ubd84\uc77c \ubfd0\uc785\ub2c8\ub2e4. \ubcc0\uc555\uae30\ub294 \ud68c\ub85c \uc808\uc5f0\uae30, \uc784\ud53c\ub358\uc2a4 \ub9e4\uce6d \uc7a5\uce58, DC \ucc28\ub2e8\uae30, \uacf5\uae09 \uc81c\uc5b4 \ubc29\ubc95 \ub4f1\uc73c\ub85c\ub3c4 \uc791\uc6a9\ud569\ub2c8\ub2e4.<\/p>\n<h2 id=\"how\">\ubcc0\uc555\uae30\uc758 \uc791\ub3d9 \uc6d0\ub9ac: \ud55c \ub2e4\uc774\uc5b4\uadf8\ub7a8\uc758 \uac00\uce58\uac00 \uc788\ub294 \ub2e8\uc5b4\ub4e4<\/h2>\n<p>\uadf8 \ub4a4\uc5d0 \uc788\ub294 \uc791\ub3d9 \uc6d0\ub9ac\ub294 \ud328\ub7ec\ub370\uc774\uc758 \uc720\ub3c4 \ubc95\uce59\uc785\ub2c8\ub2e4. 1\ucc28 \uad8c\uc120\uc758 \uc804\ub958\ub294 \uc801\uce35 \uac15\ucca0 \ucf54\uc5b4\ub97c \ud1b5\uacfc\ud558\ub294 \ubcc0\ud654\ud558\ub294 \uc790\uae30\uc7a5\uc744 \uc0dd\uc131\ud569\ub2c8\ub2e4. \ubcc0\ud654\ud558\ub294 \uc790\uae30\uc7a5\uc740 2\ucc28 \ucf54\uc77c\uc5d0 \uc804\ub958\ub97c \uc720\ub3c4\ud569\ub2c8\ub2e4. 2\ucc28 \uc804\uc555\uacfc 1\ucc28 \uc804\uc555\uc758 \ube44\uc728\uc740 \uad8c\uc120 \ube44\uc728\uc5d0 \ub530\ub77c \uacb0\uc815\ub429\ub2c8\ub2e4:<\/p>\n<p>V1 \/ V2 = N1 \/ N2, \uc774\uc0c1\uc801\uc73c\ub85c\ub294 V1 \u00d7 I1 = V2 \u00d7 I2\uc785\ub2c8\ub2e4.<\/p>\n<p>\uc804\ub958\ub294 1\ucc28 \ud68c\ub85c\ub97c \ud1b5\ud574\ub9cc \ud750\ub974\uae30 \ub54c\ubb38\uc5d0(\uc720\ub3c4\ub97c \ud1b5\ud574 \uc5f0\uacb0\uc774 \uc874\uc7ac\ud558\uc9c0\ub9cc 2\ucc28 \ud68c\ub85c\ub294 \uc9c1\uc811 \uc804\uae30\uac00 \uacf5\uae09\ub418\uc9c0 \uc54a\uc74c), \ubcc0\uc555\uae30\ub294 \ub450 \ud68c\ub85c\ub97c \uc808\uc5f0 \uc0c1\ud0dc\ub85c \uc720\uc9c0\ud569\ub2c8\ub2e4. \uc2e4\uc81c\ub85c 11\/0.4 kV\uc5d0\uc11c 100 kVA \uc815\uaca9\uc758 \ubc30\uc804 \ubcc0\uc555\uae30\ub294 \uc804\uccb4 \ubd80\ud558\uc5d0\uc11c 1\ucc28\uc5d0\uc11c \uc57d 9 A\ub97c \uc6b4\ubc18\ud558\uba70, 2\ucc28\uc758 \ubd80\ud558\ub294 \uc57d 144 A\uac00 \ub420 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<h2 id=\"functions\">\ubcc0\uc555\uae30\uc758 \uc5ec\uc12f \uac00\uc9c0 \uae30\ub2a5<\/h2>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"6\">\n<caption>\ubcc0\uc555\uae30\uc758 \uc5ec\uc12f \uac00\uc9c0 \uae30\ub2a5<\/caption>\n<tbody>\n<tr>\n<th>\uae30\ub2a5<\/th>\n<th>\uadf8\uac83\uc774 \ud558\ub294 \uc77c<\/th>\n<th>\uc2e4\uc81c \uc0ac\ub840<\/th>\n<\/tr>\n<tr>\n<td>\uc804\uc555 \ubcc0\ud658<\/td>\n<td>\uad8c\uc120 \ube44\uc728\uc744 \ud1b5\ud574 \uc804\uc555 \uc218\uc900 \ubcc0\uacbd<\/td>\n<td>\uac74\ubb3c \uacf5\uae09\uc744 \uc704\ud55c 11 kV \u2192 400 V<\/td>\n<\/tr>\n<tr>\n<td>\uc804\uae30 \uc808\uc5f0<\/td>\n<td>\ud68c\ub85c\ub97c \ubd84\ub9ac; \uc9c1\uc811 \uc804\ub3c4\uccb4 \uacbd\ub85c \uc5c6\uc74c<\/td>\n<td>\uc758\ub8cc \uc601\uc0c1 \uc2a4\uc704\ud2b8\ub97c \uba54\uc778 \uacb0\ud568\uc73c\ub85c\ubd80\ud130 \uc808\uc5f0<\/td>\n<\/tr>\n<tr>\n<td>\uc784\ud53c\ub358\uc2a4 \ub9e4\uce6d<\/td>\n<td>\uc18c\uc2a4\uc640 \ubd80\ud558 \uac04\uc758 \uc804\ub825 \uc804\uc1a1 \ucd5c\uc801\ud654<\/td>\n<td>\uc570\ud504 \ucd9c\ub825\uc744 \uc2a4\ud53c\ucee4\uc5d0 \ub9de\ucd94\uae30(\uc624\ub514\uc624 \ubcc0\uc555\uae30)<\/td>\n<\/tr>\n<tr>\n<td>\uc804\uc555 \uc870\uc815<\/td>\n<td>\ud0ed \uccb4\uc778\uc800\ub97c \ud1b5\ud574 \ucd9c\ub825\uc744 \ud55c\uacc4 \ub0b4\uc5d0\uc11c \uc720\uc9c0<\/td>\n<td>OLTC\uac00 \u00b12%\uc5d0\uc11c 20 kV \ubc84\uc2a4\ub97c \uc720\uc9c0<\/td>\n<\/tr>\n<tr>\n<td>DC \ucc28\ub2e8<\/td>\n<td>AC\ub294 \ud1b5\uacfc\uc2dc\ud0a4\uace0, DC\ub294 \ucc28\ub2e8<\/td>\n<td>\ubc30\uc804 \ucf54\uc5b4\uac00 \ud3ec\ud654\ub418\ub294 \uac83\uc744 \ubc29\uc9c0\ud558\ub294 \uc720\ud574 DC<\/td>\n<\/tr>\n<tr>\n<td>\uc2e0\ud638 \uacb0\ud569<\/td>\n<td>\ub808\ubca8\uc744 \ubd84\ub9ac\ud558\uba74\uc11c \uc2e0\ud638\ub97c \uc804\uc1a1<\/td>\n<td>\ubcf4\ud638 \ub9b4\ub808\uc774\uc5d0 \uc804\uc6d0\uc744 \uacf5\uae09\ud558\ub294 \uacc4\uce21 \ubcc0\uc555\uae30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\ub300\ubd80\ubd84\uc758 \uc0ac\ub78c\ub4e4\uc740 \uccab \ubc88\uc9f8 \uc904\ub9cc \uc0dd\uac01\ud558\uc9c0\ub9cc, \uaca9\ub9ac, \uc870\uc815 \ubc0f DC \ucc28\ub2e8\uc774 \ubc14\ub85c \uadf8\ub9ac\ub4dc \uc7a5\uc560 \ub3d9\uc548 \ubbfc\uac10\ud55c \uc7a5\ube44\ub97c \uc0b4\ub9ac\ub294 \uc694\uc18c\uc785\ub2c8\ub2e4.<\/p>\n<h2 id=\"journey\">\ubcc0\uc555\uae30\uc758 \uc5ec\uc815: \ubc1c\uc804\uc18c\uc5d0\uc11c \ub2f9\uc2e0\uc758 \uc9d1\uae4c\uc9c0<\/h2>\n<p>\ub2f9\uc2e0\uc758 \uc9d1\uc5d0\uc11c\uc758 \uc870\uba85 \uacfc\uc815\uc740 \uc218\ub9ce\uc740 \ubcc0\uc555\uae30\ub85c \uad6c\uc131\ub418\uc5b4 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \ubaa9\uc801\uc744 \uc704\ud574 \uc0ac\uc6a9\ub418\ub294 \ubcc0\uc555\uae30 \uccb4\uc778\uc744 \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4:<br \/>\nGSU \ubcc0\uc555\uae30 \u2013 \ubc1c\uc804\uae30 \ucd9c\ub825 \uc804\uc555 18 kV\uac00 220\u2013765 kV \uc218\uc900\uc73c\ub85c \uc0c1\uc2b9\ud569\ub2c8\ub2e4.<br \/>\n\uc1a1\uc804 \ub2e8\uacc4 \ubcc0\uc555\uae30 \u2013 400 kV\uc758 \uc804\uc555\uc744 \uc9c0\uc5ed \ubcc0\uc804\uc18c\uc5d0\uc11c 110 kV \uc218\uc900\uc73c\ub85c \ub0ae\ucda5\ub2c8\ub2e4.<br \/>\n\ud558\uc704 \uc1a1\uc804 \ubcc0\uc555\uae30 \u2013 110 kV \uc785\ub825\uc744 20\/11 kV\ub85c \uc904\uc785\ub2c8\ub2e4.<br \/>\n\ubc30\uc804 \ubcc0\uc555\uae30 \u2013 \ub2f9\uc2e0\uc758 \uc9d1 \ubc16\uc5d0 \uc788\ub294 \uae30\ub465 \ub610\ub294 \ud328\ub4dc \uc7a5\ucc29 \ubcc0\uc555\uae30\ub85c \ub3c4\ub2ec\ud558\ub294 11 kV\uc758 \uc804\uc555\uc744 400\/230 V\ub85c \uc904\uc785\ub2c8\ub2e4.<br \/>\n\uc7a5\uce58 \uc218\uc900 \ubcc0\uc555\uae30 \u2013 \ucda9\uc804\uae30 \ubc0f \uae30\ud0c0 \uc804\uc6d0 \uacf5\uae09 \uc7a5\uce58\uac00 \ub2e4\uc591\ud55c \uc804\uae30 \uae30\uae30\uc758 \uc791\ub3d9\uc5d0 \ud544\uc694\ud55c 5\u201348 V\ub85c \uc804\uc555\uc744 \ub354 \ub0ae\ucda5\ub2c8\ub2e4.<br \/>\n\uc774\ub807\uac8c \ud558\uba74 \ubc1c\uc804\uc18c\uc640 \ud734\ub300\ud3f0 \ucda9\uc804\uae30 \uc0ac\uc774\uc5d0 4-6\uac1c\uc758 \ubcc0\uc555\uae30\uac00 \uc788\ub2e4\ub294 \uac83\uc744 \uc27d\uac8c \uc774\ud574\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h2 id=\"types\">\ubcc0\uc555\uae30 \uc720\ud615 \ubc0f \uadf8 \uae30\ub2a5<\/h2>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"6\">\n<caption>\ubcc0\uc555\uae30 \uc720\ud615 \ubc0f \uc8fc\uc694 \uae30\ub2a5<\/caption>\n<tbody>\n<tr>\n<th>\uc720\ud615<\/th>\n<th>\uc804\uc555 \ubc94\uc704<\/th>\n<th>\uae30\ub2a5 \ucd08\uc810<\/th>\n<th>\uc77c\ubc18\uc801\uc778 \uc6a9\ub3c4<\/th>\n<\/tr>\n<tr>\n<td>\uc804\ub825 \ubcc0\uc555\uae30<\/td>\n<td>33\u2013765 kV<\/td>\n<td>\ub300\ub7c9 \uc804\uc1a1, \uc870\uc815<\/td>\n<td>\ubcc0\uc804\uc18c, \ubc1c\uc804\uc18c<\/td>\n<\/tr>\n<tr>\n<td>\ubc30\uc804 \ubcc0\uc555\uae30<\/td>\n<td>4\u201335 kV<\/td>\n<td>Final step-down, efficiency<\/td>\n<td>Pole\/pad mounts, buildings<\/td>\n<\/tr>\n<tr>\n<td>Dry-type \/ cast resin<\/td>\n<td>Up to 35 kV<\/td>\n<td>Fire safety, indoor duty<\/td>\n<td>High-rises, hospitals, marine<\/td>\n<\/tr>\n<tr>\n<td>\uc808\uc5f0 \ubcc0\uc555\uae30<\/td>\n<td>Any<\/td>\n<td>Galvanic separation, noise<\/td>\n<td>Medical, labs, data centers<\/td>\n<\/tr>\n<tr>\n<td>\uc790\ub3d9 \ubcc0\uc555\uae30<\/td>\n<td>HV grid<\/td>\n<td>Economical coupling<\/td>\n<td>220\/110 kV interconnections<\/td>\n<\/tr>\n<tr>\n<td>\uacc4\uce21 \ubcc0\uc555\uae30<\/td>\n<td>Any<\/td>\n<td>Measurement &amp; protection scaling<\/td>\n<td>Relays, meters, monitoring<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Note the overlap: a &#8220;power transformer&#8221; and a &#8220;distribution transformer&#8221; perform the same fundamental function but are engineered for different duty cycles \u2014 one for continuous high load, one for variable partial load. That single difference drives most of the specification decisions.<\/p>\n<h2 id=\"efficiency\">Efficiency, Losses &amp; Energy Bills<\/h2>\n<p>Transformer efficiency is high but not free. Losses split into no-load (iron) losses, which run 24 hours a day whenever the unit is energized, and load (copper) losses, which grow with the square of current. Typical values:<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"6\">\n<caption>Transformer Efficiency &amp; Loss Data by Rating<\/caption>\n<tbody>\n<tr>\n<th>\ub4f1\uae09<\/th>\n<th>\ubb34\ubd80\ud558 \uc190\uc2e4<\/th>\n<th>\ubd80\ud558 \uc190\uc2e4<\/th>\n<th>Efficiency @ Full Load<\/th>\n<\/tr>\n<tr>\n<td>100 kVA<\/td>\n<td>\u2248180 W<\/td>\n<td>\u22481,500 W<\/td>\n<td>\u224898.3%<\/td>\n<\/tr>\n<tr>\n<td>1 MVA<\/td>\n<td>\u22481,150 W<\/td>\n<td>\u224810,500 W<\/td>\n<td>\u224898.8%<\/td>\n<\/tr>\n<tr>\n<td>10 MVA<\/td>\n<td>\u22488 kW<\/td>\n<td>\u224855 kW<\/td>\n<td>\u224899.3%<\/td>\n<\/tr>\n<tr>\n<td>100 MVA<\/td>\n<td>\u224845 kW<\/td>\n<td>\u2248320 kW<\/td>\n<td>\u224899.6%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Since transformers operate continuously, the costs caused by losses are important. The distribution transformer with a 1 MVA capacity having losses of approximately 1.5% can waste around 10\u201315 MWh of electrical energy during the year, which can cost several thousands of dollars per year at usual prices for commercial electricity. Operators should keep in mind that in case there are thousands of units in the fleet, the standards of efficiency (e.g., China\u2019s GB 20052 and the EU\u2019s Regulation 548\/2014) will have an economic significance for the country.<\/p>\n<h2 id=\"safety\">Safety Functions: Isolation, Earthing &amp; Protection<\/h2>\n<p>Transformers are used for safety-critical tasks that include:<\/p>\n<p>Galvanic Isolation: There is no conductive connection between the primary and secondary windings so that any fault occurring at the load side cannot return back into the supply circuit.<br \/>\nFault Limitation: Impedance of a transformer (typically between 5 and 10%) limits short circuit current that prevents damage to switchgear and protection devices in subsequent sections of the electric circuit.<br \/>\nNeutral Earthing: The type and configuration of the transformer winding defines the neutral earthing scheme that provides information regarding the touch voltage and the way the transformer is protected.<br \/>\nFire Safety: Dry type and ester filled transformers are considered safer than oil-filled equipment as NFPA 70 and IEC 60076-11 standards promote their indoor applications because of their lower fire hazard in buildings.<br \/>\nReliable Separation of Voltages: Oil insulated bushings and other insulation designs of the transformers interrupt any access to the hazardous voltage zones.<\/p>\n<p>This list provides information regarding reasons why regulations classified the installation of transformers as an engineering activity that requires knowledge of such aspects as distance requirements, oil containment, etc.<\/p>\n<h2 id=\"specs\">Transformer Specifications &amp; Ratings Table<\/h2>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"6\">\n<caption>Key Specifications for a Typical Distribution Transformer<\/caption>\n<tbody>\n<tr>\n<th>\ub9e4\uac1c\ubcc0\uc218<\/th>\n<th>Typical Value (1 MVA, 11\/0.4 kV)<\/th>\n<\/tr>\n<tr>\n<td>\uc815\uaca9 \uc804\ub825<\/td>\n<td>1,000 kVA<\/td>\n<\/tr>\n<tr>\n<td>\uc804\uc555 \ube44\uc728<\/td>\n<td>11,000 \/ 400 V<\/td>\n<\/tr>\n<tr>\n<td>\ubca1\ud130 \uadf8\ub8f9<\/td>\n<td>Dyn11<\/td>\n<\/tr>\n<tr>\n<td>\uc784\ud53c\ub358\uc2a4 \uc804\uc555<\/td>\n<td>6%<\/td>\n<\/tr>\n<tr>\n<td>\ub0c9\uac01<\/td>\n<td>ONAN<\/td>\n<\/tr>\n<tr>\n<td>\uc808\uc5f0 \uc218\uc900<\/td>\n<td>75 kV BIL primary<\/td>\n<\/tr>\n<tr>\n<td>\ubb34\ubd80\ud558 \uc190\uc2e4<\/td>\n<td>\u22481,150 W<\/td>\n<\/tr>\n<tr>\n<td>\ubd80\ud558 \uc190\uc2e4<\/td>\n<td>\u224810,500 W<\/td>\n<\/tr>\n<tr>\n<td>\ud45c\uc900<\/td>\n<td>IEC 60076-1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These ten numbers define the entire functional contract of the device. When buyers compare transformers, they are comparing these numbers \u2014 and the guarantees behind them.<\/p>\n<h2 id=\"applications\">Applications Across Buildings, Industry &amp; Infrastructure<\/h2>\n<ul>\n<li>Commercial entities &#8212; 11 kilovolt feeds transformed to 400 and 230 volts.<br \/>\nHealthcare facilities &#8212; isolation transformers used to protect sensitive medical devices.<br \/>\nData centers &#8212; medium-voltage system and uninterruptible power supplies distribution and step-down units installed.<br \/>\nManufacturing sites &#8212; transformers are used to step down voltage from 33 kilovolts to 11 kilovolts.<br \/>\nWind and solar renewable energy &#8212; substations are reversely used to transform renewables output from low to grid voltage.<br \/>\nRailway operational work &#8212; substation transformers transmitting energy in 25 kV voltage.<\/li>\n<\/ul>\n<h2 id=\"prices\">Realistic Prices &amp; Top Brands<\/h2>\n<p>Transformers are priced by rating, specification, and brand. Planning-level ranges (FOB, oil-immersed, standard losses):<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"6\">\n<caption>Transformer Prices &amp; Brand Comparison<\/caption>\n<tbody>\n<tr>\n<th>Brand \/ Type<\/th>\n<th>1 MVA<\/th>\n<th>20 MVA \/ 110 kV<\/th>\n<\/tr>\n<tr>\n<td>Hitachi Energy \/ Siemens<\/td>\n<td>$35,000\u2013$70,000<\/td>\n<td>$430,000\u2013$700,000<\/td>\n<\/tr>\n<tr>\n<td>\uc288\ub098\uc774\ub354 \uc77c\ub809\ud2b8\ub9ad<\/td>\n<td>$30,000\u2013$55,000<\/td>\n<td>$280,000\u2013$450,000<\/td>\n<\/tr>\n<tr>\n<td>TBEA (China)<\/td>\n<td>$18,000\u2013$35,000<\/td>\n<td>$180,000\u2013$320,000<\/td>\n<\/tr>\n<tr>\n<td>Jiangsu Subian Electric Power (China)<\/td>\n<td>$16,000\u2013$30,000<\/td>\n<td>$160,000\u2013$300,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Prices vary with specification, loss level, and region. For projects that need the full function set \u2014 transformation, isolation, regulation, and safety \u2014 without a European brand premium, <strong>\uc7a5\uc464 \uc218\ube44\uc548 \uc804\ub825<\/strong> manufactures distribution and power transformers from 50 kVA to 220 kV class, oil-immersed and dry-type, with IEC 60076 type-test reports, OEM\/ODM customization, and factory-direct pricing typically 30%\u201350% below Western equivalents. Their engineers specify the vector group, taps, and protection interface to match your installation exactly.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10970\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/6-Core-Functions-of-a-Transformer.webp\" alt=\"\" width=\"1440\" height=\"1080\" \/><\/p>\n<h2 id=\"faq\">\uc790\uc8fc \ubb3b\ub294 \uc9c8\ubb38<\/h2>\n<h3>What is the main function of a transformer in a home?<\/h3>\n<p>An electric pole or pad-mounted transformer reduces the distribution voltage from around 11 kV to 400 \/ 230 V. In addition to this reduction, the transformer provides isolation (which keeps any faults from the supply side away from the home circuit), and current scaling (which allows the device to supply approximately 144 A over 400 V at a rating of 100 kVA instead of approximately 9 A at 11 kV). After the discrete transformer, the charger reduces the voltage yet again to 5-48 V DC.<\/p>\n<h3>Why does a transformer have no moving parts?<\/h3>\n<p>Because its function is electromagnetic, not mechanical: alternating current in the primary creates a changing magnetic flux in the core, which induces voltage in the secondary. There is nothing to rotate or reciprocate, which is why transformers routinely last 30\u201340 years with maintenance limited to oil testing, gasket replacement, and tap changer servicing.<\/p>\n<h3>How efficient are transformers in real operation?<\/h3>\n<p>Distribution transformers run at about 98%\u201399% and large power transformers at 99.0%\u201399.7% at full load. Efficiency peaks at partial load (typically 40%\u201375% of rating), which is why engineers size transformers so normal load sits in that band. Losses are continuous, so efficiency and loss guarantees dominate long-term operating cost.<\/p>\n<h3>What is the difference between a step-up and a step-down transformer?<\/h3>\n<p>Functionally identical physics, opposite direction: a step-up transformer has more turns on the secondary (V2 &gt; V1) and is used at power plants to raise voltage for transmission; a step-down has more turns on the primary (V2 &lt; V1) and feeds distribution and end users. The same physical transformer can even be used in both roles depending on which winding is the supply side.<\/p>\n<h3>How much does a transformer cost for a building or factory?<\/h3>\n<p>A 100 kVA unit costs about $1,500\u2013$8,000, a 1 MVA unit $18,000\u2013$45,000 (oil) or $28,000\u2013$70,000 (dry-type), and a 20 MVA \/ 110 kV power transformer $160,000\u2013$700,000 depending on brand and specification. Always request quotes on identical specifications, and factor in installation, protection, and testing costs, which can add 20%\u201340% to the equipment price.<\/p>\n<h2 id=\"references\">\ucc38\uace0 \ubb38\ud5cc<\/h2>\n<ul>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/639\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-1: \uc804\ub825 \ubcc0\uc555\uae30 \u2014 \uc77c\ubc18<\/a> \u2014 The international standard for ratings, tolerances, and tests.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/649\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-11: Dry-Type Transformers<\/a> \u2014 Requirements specific to dry-type and cast-resin transformers.<\/li>\n<li><a href=\"https:\/\/ieeexplore.ieee.org\/document\/5307241\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.12.00: \uc561\uccb4 \uce68\uc9c0 \ubcc0\uc555\uae30\uc5d0 \ub300\ud55c \uc77c\ubc18 \uc694\uad6c \uc0ac\ud56d<\/a> \u2014 North American companion standard.<\/li>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70: National Electrical Code<\/a> \u2014 Installation and safety requirements for transformers in buildings.<\/li>\n<li><a href=\"https:\/\/www.epa.gov\/sustainable-energy\/transformer-efficiency\" rel=\"nofollow noopener\" target=\"_blank\">US EPA: Transformer Efficiency<\/a> \u2014 Why transformer efficiency matters for energy and climate policy.<\/li>\n<li><a href=\"https:\/\/www.siemens-energy.com\/global\/en\/offerings\/transformers.html\" rel=\"nofollow noopener\" target=\"_blank\">Siemens Energy Transformers<\/a> \u2014 Benchmark reference for modern transformer engineering.<\/li>\n<\/ul>\n<h2 id=\"conclusion\">\uacb0\ub860<\/h2>\n<p>The function of transformers is the quiet backbone of modern life: voltage transformation, isolation, impedance matching, regulation, DC blocking, and signal coupling, all delivered with no moving parts and efficiencies above 98%. From the GSU at a power plant to the pad-mount unit outside your building, every stage of the electrical chain depends on this device.<\/p>\n<ul>\n<li>Transformers change voltage by turns ratio while isolating circuits and limiting faults.<\/li>\n<li>Efficiency of 98%\u201399.7% still costs money at scale \u2014 loss guarantees matter.<\/li>\n<li>Safety functions (isolation, earthing, impedance) are engineered, not optional.<\/li>\n<li>Budget $1.5k\u2013$8k for 100 kVA, $18k\u2013$45k for 1 MVA, $160k\u2013$700k for 20 MVA class.<\/li>\n<\/ul>\n<p>If you are specifying a transformer for a building, factory, or utility project, <a href=\"https:\/\/subian-electric.com\/ko\/\">\uc7a5\uc464 \uc218\ube44\uc548 \uc804\ub825<\/a> supplies distribution and power transformers from 50 kVA to 220 kV class with IEC 60076 certification and engineering support for every step of your project.<\/p>","protected":false},"excerpt":{"rendered":"<p>If you are at a shopping mall or data center, a few feet away from the cabling, you will pass by two major types of transformers \u2014 the pad mounted equipment servicing the building and the dry type transformers converting 11 kV to 400 kV \u2014 and won\u2019t even realize. Everything that runs on electricity [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":10972,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[77],"tags":[],"class_list":["post-10969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/posts\/10969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/comments?post=10969"}],"version-history":[{"count":2,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/posts\/10969\/revisions"}],"predecessor-version":[{"id":11018,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/posts\/10969\/revisions\/11018"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/media\/10972"}],"wp:attachment":[{"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/media?parent=10969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/categories?post=10969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subian-electric.com\/ko\/wp-json\/wp\/v2\/tags?post=10969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}