{"id":2376,"date":"2026-08-14T04:31:00","date_gmt":"2026-08-14T04:31:00","guid":{"rendered":"https:\/\/lbajiele.com\/news\/oltc-vs-off-circuit-tap-changer-procurement-decision-guide\/"},"modified":"2026-08-14T05:41:14","modified_gmt":"2026-08-14T05:41:14","slug":"oltc-vs-off-circuit-tap-changer-procurement-decision-guide","status":"publish","type":"post","link":"https:\/\/lbajiele.com\/vi\/blog\/oltc-vs-off-circuit-tap-changer-procurement-decision-guide\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn quy\u1ebft \u0111\u1ecbnh mua s\u1eafm: B\u1ed9 \u0111\u1ed5i n\u1eafp d\u01b0\u1edbi t\u1ea3i (OLTC) so v\u1edbi B\u1ed9 \u0111\u1ed5i n\u1eafp kh\u00f4ng t\u1ea3i"},"content":{"rendered":"<div class=\"b2b-article\">\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>OLTC so v\u1edbi b\u1ed9 \u0111\u1ed5i n\u1ea5c kh\u00f4ng t\u1ea3i<\/strong> so s\u00e1nh hai c\u1eeda s\u1ed5 v\u1eadn h\u00e0nh \u0111\u1ec3 thay \u0111\u1ed5i t\u1ef7 s\u1ed1 m\u00e1y bi\u1ebfn \u00e1p. N\u1ebfu d\u1ef1 \u00e1n c\u1ea7n \u0111i\u1ec1u ki\u1ec7n ch\u1ec9nh s\u1eeda khi \u0111ang mang \u0111i\u1ec7n, h\u00e3y n\u00eau r\u00f5 ch\u1ebf \u0111\u1ed9 v\u1eadn h\u00e0nh \u0111\u00f3 v\u00e0 c\u00e1c giao di\u1ec7n \u0111i\u1ec1u khi\u1ec3n c\u1ee7a n\u00f3; n\u1ebfu vi\u1ec7c ch\u1ec9nh s\u1eeda ch\u1ec9 c\u00f3 th\u1ec3 di\u1ec5n ra trong th\u1eddi gian c\u1eaft \u0111i\u1ec7n theo k\u1ebf ho\u1ea1ch, h\u00e3y n\u00eau r\u00f5 \u0111i\u1ec1u \u0111\u00f3 thay th\u1ebf.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">Kh\u00f4ng c\u00f3 s\u1ef1 s\u1eafp x\u1ebfp n\u00e0o l\u00e0 \u01b0u vi\u1ec7t m\u1ed9t c\u00e1ch ph\u1ed5 qu\u00e1t. H\u00e0nh vi \u0111i\u1ec7n \u00e1p y\u00eau c\u1ea7u, c\u1eeda s\u1ed5 ho\u1ea1t \u0111\u1ed9ng, giao di\u1ec7n \u0111i\u1ec7n v\u00e0 c\u00e1c b\u1ea3n v\u1ebd \u0111\u00e3 ch\u1ecdn quy\u1ebft \u0111\u1ecbnh y\u00eau c\u1ea7u ph\u00f9 h\u1ee3p.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"Oil immersed transformer options for tap changer decision planning\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/oltc-off-circuit-decision-01.webp\" \/><\/figure>\n<nav class=\"b2b-toc\" style=\"background:#f5f8fa;padding:16px 20px;border-radius:8px;margin:0 0 24px\">\n<h2 id=\"contents\" style=\"margin:42px 0 14px;scroll-margin-top:96px\">M\u1ee5c l\u1ee5c<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"#part-1-what-is-the-core-procurement-decision\">Ph\u1ea7n 1. Quy\u1ebft \u0111\u1ecbnh mua s\u1eafm c\u1ed1t l\u00f5i l\u00e0 g\u00ec?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-2-how-do-the-operating-windows-differ\">Ph\u1ea7n 2. C\u00e1c kho\u1ea3ng th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-3-which-project-inputs-define-the-choice\">Ph\u1ea7n 3. Nh\u1eefng \u0111\u1ea7u v\u00e0o d\u1ef1 \u00e1n n\u00e0o quy\u1ebft \u0111\u1ecbnh s\u1ef1 l\u1ef1a ch\u1ecdn n\u00e0y?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-4-how-should-offers-be-compared\">Ph\u1ea7n 4. C\u00e1c \u01b0u \u0111\u00e3i n\u00ean \u0111\u01b0\u1ee3c so s\u00e1nh nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-5-where-are-the-fit-boundaries\">Ph\u1ea7n 5. C\u00e1c ranh gi\u1edbi v\u1eeba v\u1eb7n \u1edf \u0111\u00e2u?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-6-what-should-the-rfq-include\">Ph\u1ea7n 6. RFQ n\u00ean bao g\u1ed3m nh\u1eefng g\u00ec?<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"#part-7-how-should-the-sfz11-catalog-page-be-used\">Ph\u1ea7n 7. N\u00ean s\u1eed d\u1ee5ng trang danh m\u1ee5c SFZ11 nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li>\n<\/ul>\n<\/nav>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-1-what-is-the-core-procurement-decision\">Ph\u1ea7n 1. Quy\u1ebft \u0111\u1ecbnh mua s\u1eafm c\u1ed1t l\u00f5i l\u00e0 g\u00ec?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Quy\u1ebft \u0111\u1ecbnh n\u00e0y li\u00ean quan \u0111\u1ebfn ph\u1ea1m vi v\u1eadn h\u00e0nh cho ph\u00e9p \u0111\u1ed1i v\u1edbi vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh t\u1ef7 s\u1ed1. Ti\u00eau chu\u1ea9n IEC 60214-1 cung c\u1ea5p m\u1ed9t \u1ea5n ph\u1ea9m chuy\u00ean d\u1ee5ng cho c\u00e1c y\u00eau c\u1ea7u v\u1ec1 hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 \u0111i\u1ec1u \u00e1p, v\u00ec v\u1eady ng\u01b0\u1eddi mua n\u00ean m\u00f4 t\u1ea3 ch\u1ee9c n\u0103ng d\u1ef1 \u0111\u1ecbnh thay v\u00ec d\u1ef1a v\u00e0o m\u1ed9t nh\u00e3n ng\u1eafn g\u1ecdn (<a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5999\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60214-1<\/a>).<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">B\u1eaft \u0111\u1ea7u v\u1edbi s\u1ef1 bi\u1ebfn \u0111\u1ed9ng \u0111i\u1ec7n \u00e1p h\u1ec7 th\u1ed1ng v\u00e0 k\u1ebft qu\u1ea3 y\u00eau c\u1ea7u ph\u00eda t\u1ea3i. Sau \u0111\u00f3, x\u00e1c \u0111\u1ecbnh xem s\u1ef1 thay \u0111\u1ed5i ph\u1ea3i di\u1ec5n ra khi \u0111ang c\u00f3 \u0111i\u1ec7n hay c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00ean k\u1ebf ho\u1ea1ch trong kho\u1ea3ng th\u1eddi gian m\u1ea5t \u0111i\u1ec7n.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-2-how-do-the-operating-windows-differ\">Ph\u1ea7n 2. C\u00e1c kho\u1ea3ng th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Y\u00eau c\u1ea7u OLTC l\u00e0 cho nhi\u1ec7m v\u1ee5 thay \u0111\u1ed5i t\u1ef7 s\u1ed1 trong khi m\u00e1y bi\u1ebfn \u00e1p v\u1eabn \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n theo c\u00e1c \u0111i\u1ec1u ki\u1ec7n x\u00e1c \u0111\u1ecbnh. Y\u00eau c\u1ea7u n\u1ea5c ph\u00e2n \u00e1p phi \u0111i\u1ec7n \u00e1p l\u00e0 cho vi\u1ec7c thay \u0111\u1ed5i c\u00e0i \u0111\u1eb7t khi m\u00e1y bi\u1ebfn \u00e1p \u0111\u01b0\u1ee3c ng\u1eaft \u0111i\u1ec7n. S\u1ef1 ph\u00e2n bi\u1ec7t v\u1ec1 v\u1eadn h\u00e0nh \u0111\u00f3 n\u00ean xu\u1ea5t hi\u1ec7n trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt v\u00e0 b\u1ea3n so s\u00e1nh gi\u00e1 d\u1ef1 th\u1ea7u.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">\u0110i\u1ec3m quy\u1ebft \u0111\u1ecbnh<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Y\u00eau c\u1ea7u OLTC<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Y\u00eau c\u1ea7u \u0111i\u1ec1u ch\u1ec9nh v\u00f2i khi ng\u1eaft \u0111i\u1ec7n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Thay \u0111\u1ed5i c\u1eeda s\u1ed5<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">B\u1eaft bu\u1ed9c trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh c\u00f3 \u0111i\u1ec7n<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0110\u01b0\u1ee3c l\u00ean k\u1ebf ho\u1ea1ch khi kh\u00f4ng c\u00f3 \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0110\u1ea7u v\u00e0o d\u1ef1 \u00e1n<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Ph\u1ea1m vi \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p v\u00e0 \u0111i\u1ec1u khi\u1ec3n<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">C\u00e0i \u0111\u1eb7t c\u1ed1 \u0111\u1ecbnh b\u1eaft bu\u1ed9c v\u00e0 ranh gi\u1edbi ng\u1eebng ho\u1ea1t \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Xem x\u00e9t h\u1ed3 s\u01a1 d\u1ef1 th\u1ea7u<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">H\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n, c\u1ea3nh b\u00e1o v\u00e0 giao di\u1ec7n ph\u1ea3i d\u1ec5 nh\u00ecn th\u1ea5y<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Qu\u00e1 tr\u00ecnh b\u1ed1 tr\u00ed v\u00e0 c\u00e0i \u0111\u1eb7t c\u00f4ng t\u1eafc ph\u1ea3i nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Kh\u1edbp ranh gi\u1edbi<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Kh\u00f4ng suy lu\u1eadn t\u1eeb t\u00ean chu\u1ed7i<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0110\u1eebng cho r\u1eb1ng n\u00f3 gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c nhu c\u1ea7u \u0111i\u1ec1u ti\u1ebft khi c\u00f3 \u0111i\u1ec7n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote>\n<p style=\"margin:0 0 16px;line-height:1.7\"><strong>Quan tr\u1ecdng:<\/strong> C\u1ee5m t\u1eeb \u201cb\u1ed9 \u0111i\u1ec1u \u00e1p\u201d \u0111\u1ee9ng m\u1ed9t m\u00ecnh kh\u00f4ng x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c ch\u1ebf \u0111\u1ed9 v\u1eadn h\u00e0nh. Y\u00eau c\u1ea7u h\u1ecfi h\u00e0ng ph\u1ea3i n\u00eau r\u00f5 vi\u1ec7c thay \u0111\u1ed5i t\u1ef7 s\u1ed1 bi\u1ebfn \u00e1p l\u00e0 c\u1ea7n thi\u1ebft trong khi c\u00f3 \u0111i\u1ec7n hay ch\u1ec9 sau khi m\u00e1y bi\u1ebfn \u00e1p \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eaft \u0111i\u1ec7n (<a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5999\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60214-1<\/a>).<\/p>\n<\/blockquote>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-3-which-project-inputs-define-the-choice\">Ph\u1ea7n 3. Nh\u1eefng \u0111\u1ea7u v\u00e0o d\u1ef1 \u00e1n n\u00e0o quy\u1ebft \u0111\u1ecbnh s\u1ef1 l\u1ef1a ch\u1ecdn n\u00e0y?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">H\u00e3y \u0111\u01b0a th\u00f4ng tin v\u1ec1 bi\u00ean \u0111\u1ed9 bi\u1ebfn \u0111\u1ed9ng \u0111i\u1ec7n \u00e1p, d\u1ea3i \u0111i\u1ec7n \u00e1p y\u00eau c\u1ea7u ph\u00eda t\u1ea3i, dung l\u01b0\u1ee3ng c\u01a1 s\u1edf, t\u1ef7 l\u1ec7 bi\u1ebfn \u0111\u1ed5i, nh\u00f3m \u0111\u1ea5u n\u1ed1i, d\u1ea3i \u0111i\u1ec1u \u00e1p v\u00e0 d\u1ea3i v\u1eadn h\u00e0nh v\u00e0o c\u00f9ng m\u1ed9t y\u00eau c\u1ea7u. Th\u00eam quy\u1ec1n s\u1edf h\u1eefu qu\u1ea3n l\u00fd d\u1ef1 \u00e1n, c\u00e1c giao di\u1ec7n b\u1ea3o v\u1ec7 v\u00e0 b\u1ea5t k\u1ef3 \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh song song n\u00e0o khi c\u00f3 li\u00ean quan.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"SFZ11 transformer for control and operating-duty review\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/oltc-off-circuit-decision-02.webp\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">The <a href=\"https:\/\/lbajiele.com\/vi\/blog\/sfz11-35kv-on-load-tap-transformer-planning-guide-voltage-regulation\/\">H\u01b0\u1edbng d\u1eabn l\u1eadp k\u1ebf ho\u1ea1ch \u0111i\u1ec1u \u00e1p SFZ11<\/a> \u0111i s\u00e2u h\u01a1n v\u00e0o quy\u1ebft \u0111\u1ecbnh quy \u0111\u1ecbnh tr\u01b0\u1edbc \u0111\u00f3. S\u1eed d\u1ee5ng <a href=\"https:\/\/lbajiele.com\/vi\/blog\/parallel-operation-of-transformers-planning-inputs-boundaries\/\">h\u01b0\u1edbng d\u1eabn l\u1eadp k\u1ebf ho\u1ea1ch v\u1eadn h\u00e0nh song song<\/a> khi c\u00f3 nhi\u1ec1u h\u01a1n m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p c\u00f3 th\u1ec3 d\u00f9ng chung m\u1ed9t thanh c\u00e1i.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-4-how-should-offers-be-compared\">Ph\u1ea7n 4. C\u00e1c \u01b0u \u0111\u00e3i n\u00ean \u0111\u01b0\u1ee3c so s\u00e1nh nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">So s\u00e1nh c\u00e1c gi\u00e1 th\u1ea7u v\u1edbi m\u1ed9t y\u00eau c\u1ea7u tr\u01b0\u1edbc khi \u0111\u00e1nh gi\u00e1 gi\u00e1 ho\u1eb7c danh m\u1ee5c. M\u1ed9t y\u00eau c\u1ea7u \u0111\u1ec3 ng\u1ecf th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng c\u00f3 th\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c c\u00e1c lo\u1ea1i \u0111\u1ec1 xu\u1ea5t kh\u00e1c nhau v\u1ed1n kh\u00f4ng th\u1ec3 so s\u00e1nh \u0111\u01b0\u1ee3c v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt.<\/p>\n<table style=\"width:100%;border-collapse:collapse\">\n<thead>\n<tr>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">Tr\u01b0\u1eddng gi\u00e1 th\u1ea7u<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">C\u1ea7n c\u00f3 c\u01a1 s\u1edf chung<\/th>\n<th style=\"border:1px solid #d9e1e8;padding:9px 12px;background:#f5f8fa;text-align:left\">H\u00e0nh \u0111\u1ed9ng c\u1ee7a ng\u01b0\u1eddi mua<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Nh\u1ea5n nhi\u1ec7m v\u1ee5 v\u00e0 ph\u1ea1m vi<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">C\u00f9ng d\u1ea3i \u0111i\u1ec7n \u00e1p bi\u1ebfn thi\u00ean v\u00e0 d\u1ea3i ho\u1ea1t \u0111\u1ed9ng<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Ki\u1ec3m tra v\u1edbi m\u1ee5c ti\u00eau c\u1ee7a h\u1ec7 th\u1ed1ng<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">\u0110i\u1ec1u khi\u1ec3n v\u00e0 c\u1ea3nh b\u00e1o<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Y\u00eau c\u1ea7u v\u1ec1 c\u00f9ng quy\u1ec1n s\u1edf h\u1eefu v\u00e0 giao di\u1ec7n<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Li\u1ec7t k\u00ea c\u00e1c ph\u1ea7n bao g\u1ed3m v\u00e0 kh\u00f4ng bao g\u1ed3m<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Suy hao v\u00e0 tr\u1edf kh\u00e1ng<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">C\u00f9ng c\u1ea5u h\u00ecnh v\u00e0 c\u01a1 s\u1edf \u0111\u00e3 n\u00eau<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">So s\u00e1nh t\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">B\u1ea3n v\u1ebd v\u00e0 \u0111\u1ea7u c\u1ef1c<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">C\u00f9ng b\u1ed1 c\u1ee5c \u0111\u00e3 ch\u1ecdn<\/td>\n<td style=\"border:1px solid #d9e1e8;padding:9px 12px\">Xem l\u1ea1i c\u00e1c chuy\u1ebfn kh\u1edfi h\u00e0nh tr\u01b0\u1edbc khi th\u01b0\u1edfng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:0 0 16px;line-height:1.7\">The <a href=\"https:\/\/lbajiele.com\/vi\/blog\/35kv-oil-immersed-power-transformer-specification-inputs-substations\/\">H\u01b0\u1edbng d\u1eabn th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt 35kV<\/a> cung c\u1ea5p th\u00eam c\u00e1c ki\u1ec3m tra v\u1ec1 t\u1ef7 l\u1ec7, nh\u00f3m v\u00e9c-t\u01a1, tr\u1edf kh\u00e1ng v\u00e0 b\u1ea3n v\u1ebd.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-5-where-are-the-fit-boundaries\">Ph\u1ea7n 5. C\u00e1c ranh gi\u1edbi v\u1eeba v\u1eb7n \u1edf \u0111\u00e2u?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Kh\u00f4ng ch\u1ecdn m\u1eb7c \u0111\u1ecbnh c\u1ea5u h\u00ecnh n\u00e0o c\u1ea3. C\u1ea5u h\u00ecnh OLTC l\u00e0 kh\u00f4ng h\u1ee3p l\u00fd khi kh\u00f4ng c\u00f3 nhi\u1ec7m v\u1ee5 \u0111i\u1ec1u ch\u1ec9nh d\u01b0\u1edbi \u0111i\u1ec7n \u00e1p. C\u1ea5u h\u00ecnh ng\u1eaft \u0111i\u1ec7n l\u00e0 kh\u00f4ng \u0111\u1ee7 khi d\u1ef1 \u00e1n \u0111\u00e3 x\u00e1c \u0111\u1ecbnh r\u00f5 nhu c\u1ea7u thay \u0111\u1ed5i t\u1ef7 s\u1ed1 trong l\u00fac c\u00f3 \u0111i\u1ec7n.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">C\u1ee7a IEEE <a href=\"https:\/\/standards.ieee.org\/standard\/C57_131-2012.html\" rel=\"nofollow noopener\" target=\"_blank\">Danh s\u00e1ch C57.131<\/a> l\u00e0 m\u1ed9t t\u00e0i li\u1ec7u tham kh\u1ea3o c\u00e1c y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p d\u01b0\u1edbi t\u1ea3i, kh\u00f4ng ph\u1ea3i l\u00e0 b\u1eb1ng ch\u1ee9ng cho th\u1ea5y m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c b\u1ed1 tr\u00ed tr\u1ea1m c\u1ee5 th\u1ec3 n\u00e0o \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t. D\u1ef1 \u00e1n ph\u1ea3i thi\u1ebft l\u1eadp c\u00e1c y\u00eau c\u1ea7u b\u1ea3o v\u1ec7, \u0111i\u1ec1u khi\u1ec3n v\u00e0 nghi\u1ec7m thu cu\u1ed1i c\u00f9ng.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-6-what-should-the-rfq-include\">Ph\u1ea7n 6. RFQ n\u00ean bao g\u1ed3m nh\u1eefng g\u00ec?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">Ng\u01b0\u1eddi mua c\u1ea7n cung c\u1ea5p:<\/p>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\">s\u01a1 \u0111\u1ed3 \u0111\u01a1n tuy\u1ebfn, t\u1ec9 s\u1ed1 \u0111\u1ecbnh m\u1ee9c v\u00e0 bi\u1ebfn \u0111\u1ed9ng \u0111i\u1ec7n \u00e1p d\u1ef1 ki\u1ebfn;<\/li>\n<li style=\"margin:0 0 8px\">d\u1ea3i \u0111i\u1ec7n \u00e1p ph\u00eda t\u1ea3i y\u00eau c\u1ea7u v\u00e0 c\u01a1 s\u1edf c\u00f4ng su\u1ea5t;<\/li>\n<li style=\"margin:0 0 8px\">t\u1ed5 n\u1ed1i d\u00e2y, y\u00eau c\u1ea7u n\u1ed1i \u0111\u1ea5t v\u00e0 tr\u1edf kh\u00e1ng;<\/li>\n<li style=\"margin:0 0 8px\">li\u1ec7u c\u00f3 b\u1eaft bu\u1ed9c ph\u1ea3i thay \u0111\u1ed5i t\u1ef7 s\u1ed1 khi \u0111ang c\u00f3 \u0111i\u1ec7n hay kh\u00f4ng;<\/li>\n<li style=\"margin:0 0 8px\">kho\u1ea3ng \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p, c\u00e1c giao di\u1ec7n \u0111i\u1ec1u khi\u1ec3n, c\u1ea3nh b\u00e1o, b\u1ea3o v\u1ec7 v\u00e0 truy\u1ec1n th\u00f4ng \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u; v\u00e0<\/li>\n<li style=\"margin:0 0 8px\">c\u01a1 s\u1edf t\u1ed5n th\u1ea5t, c\u00e1c \u0111\u1ea7u c\u1ef1c, b\u1ea3n v\u1ebd v\u00e0 t\u00e0i li\u1ec7u y\u00eau c\u1ea7u.<\/li>\n<\/ul>\n<p style=\"margin:0 0 16px;line-height:1.7\">Y\u00eau c\u1ea7u b\u00e1o gi\u00e1 (RFQ) n\u00e0y l\u00e0m r\u00f5 ch\u1ebf \u0111\u1ed9 v\u1eadn h\u00e0nh b\u1eaft bu\u1ed9c trong khi v\u1eabn \u0111\u1ec3 ng\u1ecf c\u00e1c chi ti\u1ebft ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn c\u1ee7a m\u00f4 h\u00ecnh \u0111\u1ec3 xem x\u00e9t c\u1ea5u h\u00ecnh.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"part-7-how-should-the-sfz11-catalog-page-be-used\">Ph\u1ea7n 7. N\u00ean s\u1eed d\u1ee5ng trang danh m\u1ee5c SFZ11 nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n<p style=\"margin:0 0 16px;line-height:1.7\">The <a href=\"https:\/\/lbajiele.com\/vi\/san-pham\/sfz11-35kv-loaded-oil-immersed-power-transformer\/\">M\u00e1y bi\u1ebfn \u00e1p ng\u00e2m d\u1ea7u ch\u1ecbu t\u1ea3i 35kV SFZ11<\/a> trang n\u00e0y c\u00f3 th\u1ec3 d\u00f9ng l\u00e0m t\u00e0i li\u1ec7u tham kh\u1ea3o d\u1ea1ng danh m\u1ee5c sau khi nhi\u1ec7m v\u1ee5 \u0111i\u1ec7n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. N\u00f3 c\u00f4ng b\u1ed1 c\u00e1c tr\u01b0\u1eddng c\u00f4ng su\u1ea5t, \u0111i\u1ec7n \u00e1p, nh\u00f3m \u0111\u1ea5u n\u1ed1i, t\u1ed5n th\u1ea5t v\u00e0 t\u1ed5ng tr\u1edf.<\/p>\n<figure style=\"margin:26px 0;text-align:center\"><img decoding=\"async\" style=\"max-width:640px;width:100%;height:auto;display:block;margin:0 auto;border-radius:8px\" alt=\"SFZ11 transformer for product and drawing review\" src=\"https:\/\/lbajiele.com\/wp-content\/uploads\/2026\/08\/oltc-off-circuit-decision-03.webp\" \/><\/figure>\n<p style=\"margin:0 0 16px;line-height:1.7\">Trang t\u01b0\u01a1ng t\u1ef1 cho bi\u1ebft c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 ch\u1ec9 thay \u0111\u1ed5i \u0111i\u1ec7n \u00e1p ph\u00e2n r\u1ebd sau khi ngu\u1ed3n \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c ng\u1eaft. Do \u0111\u00f3, trang n\u00e0y kh\u00f4ng kh\u1eb3ng \u0111\u1ecbnh ch\u1ee9c n\u0103ng OLTC t\u1eeb ti\u00eau \u0111\u1ec1 c\u1ee7a n\u00f3; h\u00e3y x\u00e1c nh\u1eadn l\u1ea1i b\u1ed1 tr\u00ed \u0111\u1ea7u ph\u00e2n r\u1ebd, c\u00e1c b\u1ed9 ph\u1eadn \u0111i\u1ec1u khi\u1ec3n v\u00e0 b\u1ea3n v\u1ebd tr\u01b0\u1edbc khi l\u1ef1a ch\u1ecdn.<\/p>\n<p style=\"margin:0 0 16px;line-height:1.7\">G\u1eedi danh s\u00e1ch t\u00e0i li\u1ec7u v\u00e0 nhi\u1ec7m v\u1ee5 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh qua nh\u00e9 <a href=\"https:\/\/lbajiele.com\/vi\/contact-us\/\">Li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i<\/a> cho m\u1ed9t \u0111\u00e1nh gi\u00e1 d\u00e0nh ri\u00eang cho c\u1ea5u h\u00ecnh.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"faqs\">C\u00e1c c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3 style=\"margin:28px 0 12px\">S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa OLTC v\u00e0 b\u1ed9 \u0111i\u1ec1u \u00e1p kh\u00f4ng t\u1ea3i (off-circuit tap changer) l\u00e0 g\u00ec?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Y\u00eau c\u1ea7u v\u1ec1 b\u1ed9 \u0111i\u1ec1u \u00e1p d\u01b0\u1edbi t\u1ea3i (OLTC) li\u00ean quan \u0111\u1ebfn vi\u1ec7c thay \u0111\u1ed5i t\u1ef7 s\u1ed1 trong khi m\u00e1y bi\u1ebfn \u00e1p \u0111ang \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n. C\u1ea5u h\u00ecnh \u0111\u1ea7u ph\u00e2n \u00e1p kh\u00f4ng t\u1ea3i \u0111\u01b0\u1ee3c thay \u0111\u1ed5i sau khi m\u00e1y bi\u1ebfn \u00e1p \u0111\u00e3 \u0111\u01b0\u1ee3c ng\u1eaft \u0111i\u1ec7n. Kho\u1ea3ng v\u1eadn h\u00e0nh y\u00eau c\u1ea7u ph\u1ea3i \u0111\u01b0\u1ee3c n\u00eau r\u00f5 r\u00e0ng trong th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt mua h\u00e0ng.<\/p>\n<h3 style=\"margin:28px 0 12px\">Khi n\u00e0o OLTC \u0111\u01b0\u1ee3c xem x\u00e9t?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">H\u00e3y xem x\u00e9t t\u00ednh n\u0103ng n\u00e0y khi d\u1ef1 \u00e1n \u0111\u00e3 x\u00e1c \u0111\u1ecbnh r\u00f5 nhu c\u1ea7u \u0111i\u1ec1u ch\u1ec9nh t\u1ec9 s\u1ed1 bi\u1ebfn \u00e1p trong khi v\u1eadn h\u00e0nh c\u00f3 \u0111i\u1ec7n. Kh\u00f4ng ch\u1ecdn t\u00ednh n\u0103ng n\u00e0y ch\u1ec9 \u0111\u01a1n thu\u1ea7n v\u00ec m\u00e1y bi\u1ebfn \u00e1p c\u00f3 c\u00e1c \u0111\u1ea7u ph\u00e2n \u00e1p.<\/p>\n<h3 style=\"margin:28px 0 12px\">B\u1ed9 \u0111\u1ed5i n\u1ea5c kh\u00f4ng t\u1ea3i c\u00f3 \u00edt ph\u1ee9c t\u1ea1p h\u01a1n kh\u00f4ng?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">N\u00f3 c\u00f3 gi\u1edbi h\u1ea1n ho\u1ea1t \u0111\u1ed9ng kh\u00e1c v\u00ec c\u00e0i \u0111\u1eb7t \u0111\u01b0\u1ee3c thay \u0111\u1ed5i khi m\u1ea5t \u0111i\u1ec7n. H\u00e3y so s\u00e1nh ph\u1ea1m vi thi\u1ebft b\u1ecb chuy\u1ec3n m\u1ea1ch, \u0111i\u1ec1u khi\u1ec3n, b\u1ea3o v\u1ec7 v\u00e0 t\u00e0i li\u1ec7u th\u1ef1c t\u1ebf trong c\u1ea5u h\u00ecnh \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t.<\/p>\n<h3 style=\"margin:28px 0 12px\">Ph\u1ea3i so s\u00e1nh nh\u1eefng g\u00ec gi\u1eefa c\u00e1c gi\u00e1 th\u1ea7u?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">So s\u00e1nh ch\u1ebf \u0111\u1ed9 l\u00e0m vi\u1ec7c, t\u1ef7 s\u1ed1 bi\u1ebfn \u00e1p, d\u1ea3i \u0111i\u1ec1u \u00e1p, dao \u0111\u1ed9ng \u0111i\u1ec7n \u00e1p, ph\u1ea1m vi \u0111i\u1ec1u khi\u1ec3n v\u00e0 c\u1ea3nh b\u00e1o, c\u01a1 s\u1edf t\u1ed5n th\u1ea5t, \u0111i\u1ec7n kh\u00e1ng (tr\u1edf kh\u00e1ng), \u0111\u1ea7u c\u1ef1c, b\u1ea3n v\u1ebd v\u00e0 c\u00e1c sai l\u1ec7ch \u0111\u00e3 n\u00eau.<\/p>\n<h3 style=\"margin:28px 0 12px\">T\u00ean catalogue c\u00f3 th\u1ec3 quy\u1ebft \u0111\u1ecbnh c\u00e1ch b\u1ed1 tr\u00ed \u0111\u1ea7u ph\u00e2n \u00e1p kh\u00f4ng?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Kh\u00f4ng. Trang LBAJI SFZ11 ch\u1ee9a m\u00f4 t\u1ea3 v\u1ec1 r\u01a1-le y\u00eau c\u1ea7u ph\u1ea3i ng\u1eaft \u0111i\u1ec7n \u0111\u1ed1i v\u1edbi c\u00f4ng t\u1eafc \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3. S\u1eafp x\u1ebfp cu\u1ed1i c\u00f9ng ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn theo c\u1ea5u h\u00ecnh \u0111\u00e3 th\u1ecfa thu\u1eadn.<\/p>\n<h3 style=\"margin:28px 0 12px\">RFQ n\u00ean bao g\u1ed3m nh\u1eefng g\u00ec?<\/h3>\n<p style=\"margin:0 0 16px;line-height:1.7\">Bao g\u1ed3m th\u00f4ng s\u1ed1 \u0111i\u1ec7n, d\u1ea3i v\u1eadn h\u00e0nh khi c\u00f3 \u0111i\u1ec7n ho\u1eb7c m\u1ea5t \u0111i\u1ec7n, c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ea7u ph\u00e2n \u00e1p v\u00e0 \u0111i\u1ec1u khi\u1ec3n, giao di\u1ec7n b\u1ea3o v\u1ec7, c\u01a1 s\u1edf t\u1ed5n hao v\u00e0 tr\u1edf kh\u00e1ng, \u0111\u1ea7u c\u1ef1c, c\u00e1c b\u1ea3n v\u1ebd v\u00e0 t\u00e0i li\u1ec7u.<\/p>\n<h2 style=\"margin:42px 0 14px;scroll-margin-top:96px\" id=\"references\">T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul style=\"margin:0 0 18px 1.2em;line-height:1.7\">\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5998\" rel=\"nofollow noopener\" target=\"_blank\">H\u1ed3 s\u01a1 IEC bao g\u1ed3m c\u00e1c y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi m\u00e1y bi\u1ebfn \u00e1p<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/5999\" rel=\"nofollow noopener\" target=\"_blank\">H\u1ed3 s\u01a1 IEC \u0111\u1ec1 c\u1eadp \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a b\u1ed9 \u0111i\u1ec1u \u00e1p<\/a><\/li>\n<li style=\"margin:0 0 8px\"><a href=\"https:\/\/standards.ieee.org\/standard\/C57_131-2012.html\" rel=\"nofollow noopener\" target=\"_blank\">T\u00e0i li\u1ec7u IEEE \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c y\u00eau c\u1ea7u \u0111\u1ed1i v\u1edbi thi\u1ebft b\u1ecb \u0111i\u1ec1u ch\u1ec9nh \u0111i\u1ec7n \u00e1p d\u01b0\u1edbi t\u1ea3i<\/a><\/li>\n<\/ul>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>OLTC vs off-circuit tap changer compares two operating windows for transformer-ratio changes. If the project needs adjustment while energized, state that operating duty and its control interfaces; if adjustment can occur only during a planned outage, state that instead. Neither arrangement is universally preferable. The required voltage behavior, operating window, electrical interface and selected drawings [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2369,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31],"tags":[],"class_list":["post-2376","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2376","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/comments?post=2376"}],"version-history":[{"count":1,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2376\/revisions"}],"predecessor-version":[{"id":2377,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/posts\/2376\/revisions\/2377"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media\/2369"}],"wp:attachment":[{"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/media?parent=2376"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/categories?post=2376"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lbajiele.com\/vi\/wp-json\/wp\/v2\/tags?post=2376"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}