{"id":2559,"date":"2026-07-16T14:00:00","date_gmt":"2026-07-16T06:00:00","guid":{"rendered":"https:\/\/cnbygele.com\/?p=2559"},"modified":"2026-08-24T18:10:09","modified_gmt":"2026-08-24T10:10:09","slug":"ieee-519-harmonic-limits-apf-sizing","status":"publish","type":"post","link":"https:\/\/cnbygele.com\/vi\/blog\/ieee-519-harmonic-limits-apf-sizing\/","title":{"rendered":"Gi\u1edbi h\u1ea1n s\u00f3ng h\u00e0i IEEE 519: Nh\u1eefng g\u00ec c\u1ea7n x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc khi t\u00ednh ch\u1ecdn APF"},"content":{"rendered":"<hr \/>\n<p><strong>Gi\u1edbi h\u1ea1n s\u00f3ng h\u00e0i IEEE 519<\/strong> l\u00e0 m\u1ed9t khung thi\u1ebft k\u1ebf v\u00e0 x\u00e1c minh d\u1ef1a tr\u00ean PCC \u0111\u1ed1i v\u1edbi \u0111\u1ed9 m\u00e9o \u0111i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n \u1edf tr\u1ea1ng th\u00e1i \u1ed5n \u0111\u1ecbnh. Tr\u01b0\u1edbc khi m\u1ed9t b\u1ed9 l\u1ecdc c\u00f4ng su\u1ea5t t\u00edch \u0111i\u1ec3m \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc, k\u1ef9 s\u01b0 n\u00ean x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m chung (PCC) c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, x\u00e1c \u0111\u1ecbnh xem \u0111\u1ed9 m\u00e9o \u0111i\u1ec7n \u00e1p hay d\u00f2ng \u0111i\u1ec7n l\u00e0 v\u1ea5n \u0111\u1ec1 quy\u1ebft \u0111\u1ecbnh, thu th\u1eadp d\u1eef li\u1ec7u nhu c\u1ea7u t\u1ed1i \u0111a v\u00e0 ng\u1eafn m\u1ea1ch, \u0111\u1ed3ng th\u1eddi l\u1ea5y m\u1ed9t b\u1ea3n ghi s\u00f3ng h\u00e0i mang t\u00ednh \u0111\u1ea1i di\u1ec7n.<\/p>\n<p>\u0110\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 cam k\u1ebft tu\u00e2n th\u1ee7 cho b\u1ea5t k\u1ef3 s\u1ea3n ph\u1ea9m n\u00e0o. \u0110\u00e2y l\u00e0 m\u1ed9t c\u00e1ch thi\u1ebft th\u1ef1c \u0111\u1ec3 bi\u1ebfn m\u1ed9t y\u00eau c\u1ea7u m\u01a1 h\u1ed3\u2014\u201c\u0111\u00e1p \u1ee9ng ti\u00eau chu\u1ea9n IEEE 519\u201d\u2014th\u00e0nh m\u1ed9t ph\u1ea1m vi c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi c\u00f4ng ty \u0111i\u1ec7n l\u1ef1c, \u0111\u1ed9i ng\u0169 nh\u00e0 m\u00e1y, t\u01b0 v\u1ea5n vi\u00ean v\u00e0 nh\u00e0 cung c\u1ea5p thi\u1ebft b\u1ecb l\u1ecdc s\u00f3ng h\u00e0i.<\/p>\n<h2>M\u1ee5c l\u1ee5c<\/h2>\n<ul>\n<li>Ph\u1ea7n 1: Ph\u1ea1m vi c\u1ee7a IEEE 519<\/li>\n<li>Ph\u1ea7n 2: \u0110\u1ecbnh ngh\u0129a v\u00e0 v\u1ecb tr\u00ed PCC<\/li>\n<li>Ph\u1ea7n 3: T\u1ed5ng m\u00e9o s\u00f3ng h\u00e0i \u0111i\u1ec7n \u00e1p (voltage THD) so v\u1edbi t\u1ed5ng m\u00e9o s\u00f3ng h\u00e0i d\u00f2ng \u0111i\u1ec7n (current TDD)<\/li>\n<li>Ph\u1ea7n 4: C\u00e1c h\u00e0ng Isc\/IL v\u00e0 m\u00e9o d\u00f2ng \u0111i\u1ec7n<\/li>\n<li>Ph\u1ea7n 5: b\u1ea3n ghi \u0111o l\u01b0\u1eddng tr\u01b0\u1edbc khi \u0111\u1ecbnh c\u1ee1<\/li>\n<li>Ph\u1ea7n 6: chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u th\u00e0nh ph\u1ea1m vi gi\u1ea3m thi\u1ec3u<\/li>\n<li>Ph\u1ea7n 7: C\u00e1c \u0111\u1ea7u v\u00e0o RFQ v\u00e0 Gi\u1edbi h\u1ea1n Ph\u00f9 h\u1ee3p<\/li>\n<\/ul>\n<figure><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1712\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a.webp\" alt=\"Power quality measurement equipment for IEEE 519 harmonic assessment\" class=\"wp-image-2092\" srcset=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a.webp 2560w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-300x201.webp 300w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-1024x685.webp 1024w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-768x514.webp 768w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-1536x1027.webp 1536w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-2048x1370.webp 2048w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-18x12.webp 18w, https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/985c0db01b3e45f18a5857f01a124c3a-600x401.webp 600w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption>C\u00f4ng vi\u1ec7c theo ti\u00eau chu\u1ea9n IEEE 519 b\u1eaft \u0111\u1ea7u v\u1edbi m\u1ed9t PCC \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh v\u00e0 m\u1ed9t b\u1ea3n ghi \u0111o l\u01b0\u1eddng c\u00f3 th\u1ec3 truy nguy\u00ean.<\/figcaption><\/figure>\n<h2>Ph\u1ea7n 1. C\u00e1c gi\u1edbi h\u1ea1n s\u00f3ng h\u00e0i theo ti\u00eau chu\u1ea9n IEEE 519 qu\u1ea3n l\u00fd nh\u1eefng v\u1ea5n \u0111\u1ec1 g\u00ec?<\/h2>\n<p>IEEE 519 thi\u1ebft l\u1eadp c\u00e1c m\u1ee5c ti\u00eau thi\u1ebft k\u1ebf ki\u1ec3m so\u00e1t s\u00f3ng h\u00e0i cho c\u00e1c h\u1ec7 th\u1ed1ng \u0111i\u1ec7n bao g\u1ed3m c\u00e1c t\u1ea3i tuy\u1ebfn t\u00ednh v\u00e0 phi tuy\u1ebfn t\u00ednh. Hi\u1ec7p h\u1ed9i Ti\u00eau chu\u1ea9n IEEE m\u00f4 t\u1ea3 giao di\u1ec7n gi\u1eefa ngu\u1ed3n v\u00e0 t\u1ea3i l\u00e0 \u0111i\u1ec3m chung k\u1ebft n\u1ed1i v\u00e0 n\u00eau r\u00f5 ti\u00eau chu\u1ea9n n\u00e0y gi\u1ea3i quy\u1ebft c\u00e1c gi\u1edbi h\u1ea1n \u1edf ch\u1ebf \u0111\u1ed9 thi\u1ebft l\u1eadp. Ranh gi\u1edbi \u0111\u00f3 r\u1ea5t quan tr\u1ecdng: m\u1ed9t s\u1ef1 ki\u1ec7n t\u1ee9c th\u1eddi, m\u1ed9t ch\u1ec9 s\u1ed1 \u0111\u1ecdc t\u1ea1i \u0111\u1ea7u c\u1ef1c b\u1ed9 truy\u1ec1n \u0111\u1ed9ng v\u00e0 m\u1ed9t k\u1ebft qu\u1ea3 PCC c\u1ee7a ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1c ph\u00e9p \u0111o c\u00f3 th\u1ec3 ho\u00e1n \u0111\u1ed5i cho nhau.<\/p>\n<p>\u0110\u1ed1i v\u1edbi m\u1ed9t c\u01a1 s\u1edf c\u00f4ng nghi\u1ec7p, ti\u00eau chu\u1ea9n gi\u00fap ph\u00e2n t\u00e1ch hai tr\u00e1ch nhi\u1ec7m. Ng\u01b0\u1eddi s\u1eed d\u1ee5ng ki\u1ec3m so\u00e1t vi\u1ec7c b\u01a1m d\u00f2ng \u0111i\u1ec7n s\u00f3ng h\u00e0i t\u1eeb c\u00e1c t\u1ea3i phi tuy\u1ebfn t\u00ednh. T\u00ecnh tr\u1ea1ng m\u00e9o \u0111i\u1ec7n \u00e1p c\u1ee7a h\u1ec7 th\u1ed1ng ngu\u1ed3n \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 t\u1ea1i c\u00f9ng m\u1ed9t \u0111i\u1ec3m giao di\u1ec7n. Do \u0111\u00f3, m\u1ed9t d\u1ef1 \u00e1n th\u00e0nh c\u00f4ng \u0111\u00f2i h\u1ecfi th\u00f4ng tin v\u1ec1 ngu\u1ed3n v\u00e0 th\u00f4ng tin v\u1ec1 t\u1ea3i, thay v\u00ec ch\u1ec9 l\u00e0 m\u1ed9t danh m\u1ee5c b\u1ed9 l\u1ecdc ho\u1eb7c m\u1ed9t t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m m\u1ee5c ti\u00eau \u0111\u01b0\u1ee3c sao ch\u00e9p t\u1eeb nh\u00e0 m\u00e1y kh\u00e1c.<\/p>\n<table>\n<thead>\n<tr>\n<th>C\u00e2u h\u1ecfi<\/th>\n<th>C\u00e2u tr\u1ea3 l\u1eddi theo \u0111\u1ecbnh h\u01b0\u1edbng IEEE 519<\/th>\n<th>\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c mua s\u1eafm<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u00e1c m\u1ee5c ti\u00eau \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 \u1edf \u0111\u00e2u?<\/td>\n<td>T\u1ea1i PCC c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 x\u00e1c \u0111\u1ecbnh<\/td>\n<td>\u0110\u01b0a PCC v\u00e0o m\u1ed9t d\u00f2ng tr\u01b0\u1edbc khi so s\u00e1nh d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>N\u00f3 c\u00f3 bao g\u1ed3m c\u00e1c s\u1ef1 ki\u1ec7n chuy\u1ec3n ti\u1ebfp kh\u00f4ng?<\/td>\n<td>Ph\u1ea1m vi \u0111\u00e3 n\u00eau l\u00e0 m\u00e9o d\u1ea1ng tr\u1ea1ng th\u00e1i thi\u1ebft l\u1eadp<\/td>\n<td>Gi\u1eef c\u00e1c nghi\u00ean c\u1ee9u v\u1ec1 s\u1ef1 ki\u1ec7n v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nh\u1ea5p nh\u00e1y t\u00e1ch bi\u1ec7t nhau<\/td>\n<\/tr>\n<tr>\n<td>D\u00f2ng \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n \u00e1p c\u00f3 \u0111\u01b0\u1ee3c ki\u1ec3m tra gi\u1ed1ng nhau kh\u00f4ng?<\/td>\n<td>Kh\u00f4ng; ch\u00fang s\u1eed d\u1ee5ng c\u00e1c s\u1ed1 l\u01b0\u1ee3ng v\u00e0 gi\u1edbi h\u1ea1n kh\u00e1c nhau<\/td>\n<td>Y\u00eau c\u1ea7u c\u1ea3 b\u1ea3n ghi \u0111i\u1ec7n \u00e1p v\u00e0 d\u00f2ng \u0111i\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>Ti\u00eau chu\u1ea9n c\u00f3 ch\u1ecdn m\u1ed9t thi\u1ebft b\u1ecb kh\u00f4ng?<\/td>\n<td>Kh\u00f4ng; n\u00f3 thi\u1ebft l\u1eadp m\u1ed9t m\u1ee5c ti\u00eau thi\u1ebft k\u1ebf d\u1ef1a tr\u00ean d\u1eef li\u1ec7u<\/td>\n<td>T\u1ea1o ph\u1ea1m vi c\u00f4ng su\u1ea5t k\u1ef9 thu\u1eadt tr\u01b0\u1edbc khi x\u00e1c \u0111\u1ecbnh dung l\u01b0\u1ee3ng APF<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ti\u00eau chu\u1ea9n n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c \u0111\u1ecdc k\u1ebft h\u1ee3p v\u1edbi c\u00e1c y\u00eau c\u1ea7u c\u1ee7a d\u1ef1 \u00e1n, quy t\u1eafc v\u1ec1 \u0111i\u1ec7n n\u0103ng, quy \u0111\u1ecbnh l\u01b0\u1edbi \u0111i\u1ec7n hi\u1ec7n h\u00e0nh, v\u00e0 c\u00e1c ti\u00eau ch\u00ed thi\u1ebft k\u1ebf\/b\u1ea3o v\u1ec7 c\u1ee7a nh\u00e0 m\u00e1y. Ti\u00eau chu\u1ea9n n\u00e0y kh\u00f4ng ch\u1ee9ng nh\u1eadn thi\u1ebft b\u1ecb c\u1ee7a nh\u00e0 c\u00e1i (nh\u00e0 cung c\u1ea5p) hay lo\u1ea1i b\u1ecf s\u1ef1 c\u1ea7n thi\u1ebft c\u1ee7a c\u00e1c b\u1eb1ng ch\u1ee9ng ch\u1ea1y th\u1eed.<\/p>\n<h2>Ph\u1ea7n 2. K\u1ef9 s\u01b0 n\u00ean x\u00e1c \u0111\u1ecbnh v\u00e0 \u0111o l\u01b0\u1eddng PCC \u1edf \u0111\u00e2u?<\/h2>\n<p>PCC th\u01b0\u1eddng l\u00e0 \u0111i\u1ec3m \u0111i\u1ec7n g\u1ea7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng nh\u1ea5t n\u01a1i ch\u1ee7 s\u1edf h\u1eefu ho\u1eb7c \u0111\u01a1n v\u1ecb v\u1eadn h\u00e0nh h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 cung c\u1ea5p d\u1ecbch v\u1ee5 cho m\u1ed9t ng\u01b0\u1eddi d\u00f9ng kh\u00e1c. \u0110\u00e1nh gi\u00e1 IEEE 519 c\u1ee7a ABB l\u01b0u \u00fd r\u1eb1ng \u0111\u1ed1i v\u1edbi m\u1ed9t nh\u00e0 m\u00e1y s\u1ea3n xu\u1ea5t \u0111\u01b0\u1ee3c c\u1ea5p \u0111i\u1ec7n qua m\u1ed9t m\u00e1y bi\u1ebfn \u00e1p chuy\u00ean d\u1ee5ng, \u0111\u00e2y th\u01b0\u1eddng l\u00e0 ph\u00eda cao \u00e1p c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p \u0111\u00f3; v\u1ecb tr\u00ed th\u1ef1c t\u1ebf ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh t\u1eeb s\u01a1 \u0111\u1ed3 h\u1ec7 th\u1ed1ng.<\/p>\n<p>C\u00e1c ph\u00e9p \u0111o n\u1ed9i b\u1ed9 v\u1eabn c\u00f3 gi\u00e1 tr\u1ecb. B\u1ed9 c\u1ea5p \u0111\u1ed9ng c\u01a1 ti\u1ebft l\u1ed9 quang ph\u1ed5 ngu\u1ed3n. T\u1ee7 MCC cho th\u1ea5y s\u1ef1 t\u1eadp h\u1ee3p c\u1ee7a m\u1ed9t s\u1ed1 t\u1ea3i. Th\u1ee9 c\u1ea5p m\u00e1y bi\u1ebfn \u00e1p c\u00f3 th\u1ec3 cho bi\u1ebft thanh c\u00e1i c\u00f3 b\u1ecb \u1ea3nh h\u01b0\u1edfng hay kh\u00f4ng. Kh\u00f4ng c\u00f3 c\u00e1i n\u00e0o trong s\u1ed1 \u0111\u00f3 t\u1ef1 \u0111\u1ed9ng tr\u1edf th\u00e0nh PCC \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ed9t y\u00eau c\u1ea7u c\u1ee7a d\u1ef1 \u00e1n.<\/p>\n<table>\n<thead>\n<tr>\n<th>V\u1ecb tr\u00ed<\/th>\n<th>S\u1eed d\u1ee5ng t\u1ed1t nh\u1ea5t<\/th>\n<th>Nh\u1eefng g\u00ec n\u00f3 kh\u00f4ng th\u1ec3 t\u1ef1 thi\u1ebft l\u1eadp<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u01b0\u1eddng d\u00e2y c\u1ea5p ngu\u1ed3n t\u1ea3i phi tuy\u1ebfn t\u00ednh ri\u00eang l\u1ebb<\/td>\n<td>Ch\u1ea9n \u0111o\u00e1n ngu\u1ed3n<\/td>\n<td>Ti\u00eam d\u00f2ng \u0111i\u1ec7n to\u00e0n b\u1ed9 nh\u00e0 m\u00e1y<\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3ng quy tr\u00ecnh \/ Bo m\u1ea1ch \u0111i\u1ec1u khi\u1ec3n MCC<\/td>\n<td>T\u1ea3i quy tr\u00ecnh t\u1ed5ng h\u1ee3p<\/td>\n<td>Hi\u1ec7u su\u1ea5t Ti\u1ec7n \u00edch\/PCC<\/td>\n<\/tr>\n<tr>\n<td>Cu\u1ed9n th\u1ee9 c\u1ea5p m\u00e1y bi\u1ebfn \u00e1p<\/td>\n<td>T\u00ecnh tr\u1ea1ng xe bus th\u1ef1c v\u1eadt<\/td>\n<td>PCC kh\u00f4ng c\u00f3 x\u00e1c nh\u1eadn quy\u1ec1n s\u1edf h\u1eefu\/ng\u1eef c\u1ea3nh giao di\u1ec7n<\/td>\n<\/tr>\n<tr>\n<td>X\u00e1c \u0111\u1ecbnh PCC<\/td>\n<td>\u0110\u00e1nh gi\u00e1 d\u1ef1a tr\u00ean chu\u1ea9n<\/td>\n<td>X\u00e1c \u0111\u1ecbnh ngu\u1ed3n c\u1ee5c b\u1ed9 kh\u00f4ng c\u00f3 d\u1eef li\u1ec7u tuy\u1ebfn c\u1ea5p h\u1ed7 tr\u1ee3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote>\n<p><strong>Quan tr\u1ecdng:<\/strong> Kh\u00f4ng thay th\u1ebf v\u1ecb tr\u00ed \u0111\u1ed3ng h\u1ed3 \u0111o tr\u00ean t\u1ee7 \u0111i\u1ec7n thu\u1eadn ti\u1ec7n cho PCC. Ph\u1ea1m vi c\u1ee7a ti\u00eau chu\u1ea9n IEEE 519 l\u00e0 giao di\u1ec7n ngu\u1ed3n\/t\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh cho h\u1ec7 th\u1ed1ng l\u1eafp \u0111\u1eb7t (<a href=\"https:\/\/standards.ieee.org\/ieee\/519\/10677\/\" rel=\"nofollow noopener\" target=\"_blank\">IEEE 519-2022<\/a>).<\/p>\n<\/blockquote>\n<h2>Ph\u1ea7n 3. T\u1ea1i sao THD \u0111i\u1ec7n \u00e1p v\u00e0 TDD d\u00f2ng \u0111i\u1ec7n l\u1ea1i l\u00e0 hai ph\u00e9p ki\u1ec3m tra kh\u00e1c nhau?<\/h2>\n<p>\u0110\u1ed9 m\u00e9o d\u1ea1ng s\u00f3ng h\u00e0i t\u1ed5ng \u0111i\u1ec7n \u00e1p m\u00f4 t\u1ea3 s\u1ef1 m\u00e9o d\u1ea1ng c\u1ee7a d\u1ea1ng s\u00f3ng \u0111i\u1ec7n \u00e1p. \u0110\u1ed9 m\u00e9o d\u1ea1ng nhu c\u1ea7u t\u1ed5ng d\u00f2ng \u0111i\u1ec7n (TDD) th\u1ec3 hi\u1ec7n d\u00f2ng \u0111i\u1ec7n s\u00f3ng h\u00e0i so v\u1edbi d\u00f2ng \u0111i\u1ec7n t\u1ea3i nhu c\u1ea7u t\u1ed1i \u0111a. THD d\u00f2ng \u0111i\u1ec7n, th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u l\u00e0 THDi, s\u1eed d\u1ee5ng d\u00f2ng \u0111i\u1ec7n c\u01a1 b\u1ea3n t\u1ee9c th\u1eddi l\u00e0m m\u1eabu s\u1ed1 c\u1ee7a n\u00f3. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 gi\u00e1 tr\u1ecb THDi \u1edf t\u1ea3i nh\u1eb9 c\u00f3 th\u1ec3 c\u00f3 v\u1ebb cao m\u00e0 kh\u00f4ng m\u00f4 t\u1ea3 c\u00f9ng m\u1ed9t \u0111\u00e1nh gi\u00e1 m\u00e9o d\u1ea1ng d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ti\u00eau chu\u1ea9n IEEE 519.<\/p>\n<p>T\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt c\u1ee7a Mirus n\u00eau r\u1eb1ng d\u00f2ng \u0111i\u1ec7n THD kh\u00f4ng n\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m m\u1eabu s\u1ed1 tu\u00e2n th\u1ee7 d\u00f2ng \u0111i\u1ec7n; TDD g\u1eafn li\u1ec1n v\u1edbi d\u00f2ng \u0111i\u1ec7n nhu c\u1ea7u. M\u1ed9t nh\u00f3m c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng THD d\u00f2ng \u0111i\u1ec7n \u0111\u1ec3 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1, nh\u01b0ng kh\u00f4ng n\u00ean bi\u1ebfn m\u00e0n h\u00ecnh t\u1ea3i nh\u1eb9 t\u1ee9c th\u1eddi th\u00e0nh th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u00f4ng su\u1ea5t APF.<\/p>\n<table>\n<thead>\n<tr>\n<th>S\u1ed1 l\u01b0\u1ee3ng<\/th>\n<th>M\u1eabu s\u1ed1<\/th>\n<th>Vai tr\u00f2 th\u1ef1c t\u1ebf<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u1ed9 m\u00e9o s\u00f3ng h\u00e0i \u0111i\u1ec7n \u00e1p<\/td>\n<td>\u0110i\u1ec7n \u00e1p c\u01a1 b\u1ea3n<\/td>\n<td>\u0110o l\u01b0\u1eddng s\u1ef1 bi\u1ebfn d\u1ea1ng d\u1ea1ng s\u00f3ng \u0111i\u1ec7n \u00e1p t\u1ea1i \u0111i\u1ec3m li\u00ean quan<\/td>\n<\/tr>\n<tr>\n<td>THDi hi\u1ec7n t\u1ea1i<\/td>\n<td>D\u00f2ng \u0111i\u1ec7n c\u01a1 b\u1ea3n t\u1ee9c th\u1eddi<\/td>\n<td>H\u1eefu \u00edch cho vi\u1ec7c ch\u1ea9n \u0111o\u00e1n ngu\u1ed3n\/t\u1ea3i tr\u1ef1c ti\u1ebfp<\/td>\n<\/tr>\n<tr>\n<td>TDD hi\u1ec7n t\u1ea1i<\/td>\n<td>D\u00f2ng \u0111i\u1ec7n t\u1ea3i nhu c\u1ea7u c\u1ef1c \u0111\u1ea1i, IL<\/td>\n<td>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 m\u00e9o d\u00f2ng \u0111i\u1ec7n theo ti\u00eau chu\u1ea9n IEEE 519<\/td>\n<\/tr>\n<tr>\n<td>D\u00f2ng \u0111i\u1ec7n h\u00e0i b\u1eadc ri\u00eang l\u1ebb<\/td>\n<td>IL cho ng\u1eef c\u1ea3nh gi\u1edbi h\u1ea1n<\/td>\n<td>Hi\u1ec3n th\u1ecb c\u00e1c \u0111\u01a1n h\u00e0ng chi\u1ebfm \u01b0u th\u1ebf trong nhu c\u1ea7u<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote>\n<p><strong>T\u1eeb l\u0129nh v\u1ef1c:<\/strong> C\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng h\u1ecfi l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ph\u00e2n bi\u1ec7t \u201cTHD, thd, TDD\u201d v\u00e0 d\u00f2ng \u0111i\u1ec7n nhu c\u1ea7u c\u1ef1c \u0111\u1ea1i \u0111\u01b0\u1ee3c l\u1ea5y nh\u01b0 th\u1ebf n\u00e0o (<a href=\"https:\/\/community.se.com\/t5\/Metering-Power-Quality\/Power-quality-analysis-THD-thd-TDD\/td-p\/44210\" rel=\"nofollow noopener\" target=\"_blank\">Th\u1ea3o lu\u1eadn c\u1ed9ng \u0111\u1ed3ng Schneider Electric<\/a>). C\u00e2u h\u1ecfi x\u00e1c \u0111\u1ecbnh m\u1ed9t y\u00eau c\u1ea7u d\u1eef li\u1ec7u; n\u00f3 kh\u00f4ng ch\u1ee9ng minh gi\u1edbi h\u1ea1n c\u1ee7a m\u1ed9t trang web hay dung l\u01b0\u1ee3ng thi\u1ebft b\u1ecb.<\/p>\n<\/blockquote>\n<h2>Ph\u1ea7n 4. Isc\/IL \u1ea3nh h\u01b0\u1edfng th\u1ebf n\u00e0o \u0111\u1ebfn vi\u1ec7c \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 m\u00e9o d\u00f2ng \u0111i\u1ec7n?<\/h2>\n<p>Isc l\u00e0 d\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch kh\u1ea3 d\u1ee5ng t\u1ea1i PCC. IL l\u00e0 d\u00f2ng \u0111i\u1ec7n t\u1ea3i c\u01a1 b\u1ea3n nhu c\u1ea7u t\u1ed1i \u0111a t\u1ea1i ch\u00ednh PCC \u0111\u00f3. M\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang, Isc\/IL, l\u1ef1a ch\u1ecdn lo\u1ea1i m\u00e9o d\u00f2ng \u0111i\u1ec7n \u00e1p d\u1ee5ng. Kh\u00f4ng h\u1ee3p l\u1ec7 khi k\u1ebft h\u1ee3p d\u1eef li\u1ec7u s\u1ef1 c\u1ed1 t\u1eeb ngu\u1ed3n ph\u00eda th\u01b0\u1ee3ng ngu\u1ed3n v\u1edbi d\u00f2ng \u0111i\u1ec7n nhu c\u1ea7u \u0111\u01b0\u1ee3c \u0111o t\u1ea1i m\u1ed9t t\u1ee7 \u0111i\u1ec7n ph\u00eda h\u1ea1 ngu\u1ed3n kh\u00f4ng li\u00ean quan.<\/p>\n<p>T\u00e0i li\u1ec7u gi\u00e1o d\u1ee5c c\u1ee7a TCI v\u00e0 IEEE gi\u1ea3i th\u00edch r\u1eb1ng c\u00e1c gi\u1edbi h\u1ea1n s\u00f3ng h\u00e0i d\u00f2ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u1ef1a tr\u00ean m\u1ed1i quan h\u1ec7 v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 ngu\u1ed3n. Do \u0111\u00f3, m\u1ed9t ngu\u1ed3n y\u1ebfu v\u00e0 m\u1ed9t ngu\u1ed3n m\u1ea1nh c\u00f3 th\u1ec3 c\u00f3 c\u00e1c gi\u1edbi h\u1ea1n m\u00e9o d\u00f2ng \u0111i\u1ec7n cho ph\u00e9p kh\u00e1c nhau ngay c\u1ea3 khi m\u1ed9t nh\u00e0 m\u00e1y s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb phi tuy\u1ebfn t\u00ednh t\u01b0\u01a1ng t\u1ef1.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1ea7u v\u00e0o b\u1eaft bu\u1ed9c<\/th>\n<th>Ai th\u01b0\u1eddng cung c\u1ea5p n\u00f3<\/th>\n<th>\u0110i\u1ec3m \u0111\u00e1nh gi\u00e1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u00f2ng \u0111i\u1ec7n ng\u1eafn m\u1ea1ch kh\u1ea3 d\u1ee5ng, Isc<\/td>\n<td>Ti\u1ec7n \u00edch, nghi\u00ean c\u1ee9u h\u1ec7 th\u1ed1ng, k\u1ef9 s\u01b0 t\u01b0 v\u1ea5n<\/td>\n<td>Ph\u1ea3i t\u01b0\u01a1ng \u1ee9ng v\u1edbi PCC<\/td>\n<\/tr>\n<tr>\n<td>D\u00f2ng \u0111i\u1ec7n nhu c\u1ea7u c\u1ef1c \u0111\u1ea1i, IL<\/td>\n<td>D\u1eef li\u1ec7u doanh thu, nghi\u00ean c\u1ee9u ho\u1eb7c ghi nh\u1eadt k\u00fd \u0111\u1ea1i di\u1ec7n<\/td>\n<td>Ph\u01b0\u01a1ng th\u1ee9c ghi nh\u1eadn v\u00e0 th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>C\u1ea5p \u0111i\u1ec7n \u00e1p<\/td>\n<td>T\u00e0i li\u1ec7u m\u1ed9t d\u00f2ng v\u00e0 cung c\u1ea5p<\/td>\n<td>S\u1eed d\u1ee5ng \u0111i\u1ec7n \u00e1p PCC, kh\u00f4ng ph\u1ea3i \u0111i\u1ec7n \u00e1p ng\u00f5 ra c\u1ee7a b\u1ed9 bi\u1ebfn t\u1ea7n<\/td>\n<\/tr>\n<tr>\n<td>Ph\u1ed5 s\u00f3ng h\u00e0i<\/td>\n<td>Thi\u1ebft b\u1ecb ph\u00e2n t\u00edch ch\u1ea5t l\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng<\/td>\n<td>Ghi nh\u1eadn c\u00e1c \u0111\u01a1n h\u00e0ng ri\u00eang l\u1ebb v\u00e0 tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>D\u1eef li\u1ec7u PFC\/b\u1ed9 l\u1ecdc hi\u1ec7n c\u00f3<\/td>\n<td>\u0110\u1ed9i ng\u0169 \u0111i\u1ec7n nh\u00e0 m\u00e1y<\/td>\n<td>Ki\u1ec3m tra hi\u1ec7n t\u01b0\u1ee3ng c\u1ed9ng h\u01b0\u1edfng n\u1ec1n ho\u1eb7c s\u1ef1 thay \u0111\u1ed5i tr\u1edf kh\u00e1ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Kh\u00f4ng \u0111\u01b0\u1ee3c \u0111o\u00e1n Isc\/IL ch\u1ec9 d\u1ef1a v\u00e0o nh\u00e3n m\u00e1y bi\u1ebfn \u00e1p. C\u00f3 th\u1ec3 c\u1ea7n \u0111\u1ebfn nghi\u00ean c\u1ee9u h\u1ec7 th\u1ed1ng ho\u1eb7c d\u1eef li\u1ec7u t\u1eeb ph\u00eda ngu\u1ed3n.<\/p>\n<h2>Ph\u1ea7n 5. B\u1ea3n ghi \u0111o l\u01b0\u1eddng n\u00e0o n\u00ean c\u00f3 tr\u01b0\u1edbc k\u00edch th\u01b0\u1edbc APF?<\/h2>\n<p>Ph\u1ea1m vi c\u1ee7a APF c\u1ea7n m\u1ed9t b\u1ea3n ghi \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh th\u1eddi gian, kh\u00f4ng ch\u1ec9 l\u00e0 \u1ea3nh ch\u1ee5p m\u00e0n h\u00ecnh THDi l\u1edbn nh\u1ea5t. H\u00e3y ghi l\u1ea1i \u0111i\u1ec7n \u00e1p, d\u00f2ng \u0111i\u1ec7n pha, c\u00e1c b\u1eadc s\u00f3ng h\u00e0i, kW, kVA, PF, tr\u1ea1ng th\u00e1i t\u1ea3i, vi\u1ec7c \u0111\u00f3ng c\u1eaft t\u1ee5 \u0111i\u1ec7n, v\u00e0 ch\u1ebf \u0111\u1ed9 v\u1eadn h\u00e0nh c\u1ee7a m\u00e1y bi\u1ebfn \u00e1p ho\u1eb7c m\u00e1y ph\u00e1t \u0111i\u1ec7n c\u00f3 li\u00ean quan. B\u1ea3n ghi ph\u1ea3i bao g\u1ed3m kho\u1ea3ng th\u1eddi gian th\u1ec3 hi\u1ec7n t\u1ea3i phi tuy\u1ebfn ho\u1ea1t \u0111\u1ed9ng n\u1eb7ng.<\/p>\n<table>\n<thead>\n<tr>\n<th>Ghi l\u1ea1i m\u1ee5c<\/th>\n<th>L\u00fd do \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng tr\u01b0\u1edbc khi ch\u1ecdn k\u00edch c\u1ee1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0110\u1ecbnh ngh\u0129a PCC v\u00e0 s\u01a1 \u0111\u1ed3 \u0111\u01a1n tuy\u1ebfn<\/td>\n<td>Gi\u1eef cho c\u00e1c v\u1ecb tr\u00ed ngu\u1ed3n, t\u1ea3i v\u00e0 ch\u1ec9 s\u1ed1 nh\u1ea5t qu\u00e1n<\/td>\n<\/tr>\n<tr>\n<td>Xu h\u01b0\u1edbng THD \u0111i\u1ec7n \u00e1p<\/td>\n<td>X\u00e1c \u0111\u1ecbnh xem hi\u1ec7n t\u01b0\u1ee3ng m\u00e9o \u0111i\u1ec7n \u00e1p c\u00f3 c\u1ea7n \u0111\u01b0\u1ee3c xem x\u00e9t ri\u00eang hay kh\u00f4ng<\/td>\n<\/tr>\n<tr>\n<td>ph\u1ed5 d\u00f2ng \u0111i\u1ec7n h\u00e0i<\/td>\n<td>Ti\u1ebft l\u1ed9 c\u00e1c b\u1eadc \u01b0u \u0111\u00e3i chi\u1ebfm \u01b0u th\u1ebf v\u00e0 c\u00e1c m\u1eabu t\u1ea3i thay \u0111\u1ed5i<\/td>\n<\/tr>\n<tr>\n<td>Ph\u01b0\u01a1ng ph\u00e1p IL v\u00e0 h\u1ed3 s\u01a1 nhu c\u1ea7u c\u1ef1c \u0111\u1ea1i<\/td>\n<td>Cho ph\u00e9p \u0111\u00e1nh gi\u00e1 TDD hi\u1ec7n t\u1ea1i<\/td>\n<\/tr>\n<tr>\n<td>Isc source and date<\/td>\n<td>Determines source-strength category<\/td>\n<\/tr>\n<tr>\n<td>Existing capacitors and reactors<\/td>\n<td>Flags resonance and retrofit constraints<\/td>\n<\/tr>\n<tr>\n<td>Expansion\/load-change plan<\/td>\n<td>Avoids sizing only for a temporary operating point<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For drive-heavy installations, the companion <a href=\"https:\/\/cnbygele.com\/vi\/blog\/vfd-harmonics-industrial-plants-apf-selection\/\">VFD harmonics selection guide<\/a> explains how feeder measurements complement, rather than replace, PCC data.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/advanced-static-var-generator-asvg-explained-cover.webp\" alt=\"Industrial switchboard monitoring for harmonic measurement and PCC planning\" class=\"wp-image-2093\"><figcaption>Measurement records should identify the electrical point, load state, and time window behind each value.<\/figcaption><\/figure>\n<h2>Part 6. How should results become a mitigation scope?<\/h2>\n<p>Translate the standard review into a clear engineering problem statement. If the issue is harmonic-current injection at a reviewed bus, an active harmonic filter can be evaluated. If the issue is dynamic reactive demand, an SVG assessment is separate. If existing capacitors interact with nonlinear loads, resonance and detuning need their own review.<\/p>\n<table>\n<thead>\n<tr>\n<th>Evidence from study<\/th>\n<th>Next engineering step<\/th>\n<th>\u0110\u1eebng m\u1eb7c \u0111\u1ecbnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Current distortion objective at a defined bus<\/td>\n<td>Evaluate APF topology, capacity, and CT placement<\/td>\n<td>That SVG alone removes harmonic current<\/td>\n<\/tr>\n<tr>\n<td>Fast kvar variation with limited harmonic-current issue<\/td>\n<td>Evaluate SVG \/ var-support approach<\/td>\n<td>That capacitors respond correctly to all dynamics<\/td>\n<\/tr>\n<tr>\n<td>Capacitor alarms and harmonic magnification<\/td>\n<td>Review detuning, impedance, and protection<\/td>\n<td>That replacing fuses solves the cause<\/td>\n<\/tr>\n<tr>\n<td>PCC target not yet defined<\/td>\n<td>Obtain utility\/system-study inputs<\/td>\n<td>That a drive-terminal THD number proves compliance<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>CNBYG\u2019s <a href=\"https:\/\/cnbygele.com\/vi\/power-quality-system\/\">H\u1ec7 th\u1ed1ng ch\u1ea5t l\u01b0\u1ee3ng \u0111i\u1ec7n n\u0103ng<\/a> v\u00e0 <a href=\"https:\/\/cnbygele.com\/vi\/product\/ahf-active-harmonic-filter-harmonic-control\/\">B\u1ed9 l\u1ecdc s\u00f3ng h\u00e0i t\u00edch c\u1ef1c AHF<\/a> pages provide product-line context. They do not guarantee IEEE 519 compliance; final selection requires the project\u2019s PCC data, topology, and commissioning plan.<\/p>\n<h2>Part 7. What should a standards-aware RFQ include, and when is CNBYG not a fit?<\/h2>\n<table>\n<thead>\n<tr>\n<th>Ng\u01b0\u1eddi mua ph\u1ea3i cung c\u1ea5p<\/th>\n<th>T\u1ea1i sao \u0111i\u1ec1u \u0111\u00f3 quan tr\u1ecdng<\/th>\n<th>L\u1ed7i ph\u1ed5 bi\u1ebfn<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>One-line with PCC marked<\/td>\n<td>Aligns measurements and requirements<\/td>\n<td>Calling every panel the PCC<\/td>\n<\/tr>\n<tr>\n<td>Utility\/source fault information<\/td>\n<td>Establishes Isc input<\/td>\n<td>Using a transformer kVA estimate as Isc<\/td>\n<\/tr>\n<tr>\n<td>Maximum demand-current method<\/td>\n<td>Establishes IL for TDD<\/td>\n<td>Using light-load current<\/td>\n<\/tr>\n<tr>\n<td>Meter logs and spectrum<\/td>\n<td>Shows time and harmonic-order behavior<\/td>\n<td>Submitting one screen capture<\/td>\n<\/tr>\n<tr>\n<td>Voltage class and existing filters<\/td>\n<td>Identifies system context<\/td>\n<td>Omitting capacitor\/reactor details<\/td>\n<\/tr>\n<tr>\n<td>Target standard and owner requirement<\/td>\n<td>Defines acceptance language<\/td>\n<td>Asking for \u201cIEEE compliant\u201d without scope<\/td>\n<\/tr>\n<tr>\n<td>CT, protection, enclosure, and communications<\/td>\n<td>Makes an APF installation reviewable<\/td>\n<td>Leaving integration to site installation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Kh\u1edbp \u0111\u01b0\u1eddng bi\u00ean<\/strong> This guide is for teams preparing harmonic data and a standards-aware engineering scope. It is not a legal interpretation of IEEE 519, a utility acceptance letter, a grid-code review, or a guarantee that an APF will meet a project target. Send a defined data package through the <a href=\"https:\/\/cnbygele.com\/vi\/contact-us\/\">Trang li\u00ean h\u1ec7 CNBYG<\/a> for product-fit discussion.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/cnbygele.com\/wp-content\/uploads\/2026\/07\/advanced-static-var-generator-asvg-explained-body.webp\" alt=\"Power quality equipment integration for PCC harmonic mitigation scope\" class=\"wp-image-2094\"><figcaption>A standards-aware RFQ connects PCC evidence with equipment, CT, protection, and commissioning requirements.<\/figcaption><\/figure>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<p><strong>What are IEEE 519 harmonic limits?<\/strong><\/p>\n<p>They are steady-state harmonic-control design goals for voltage and current distortion at the defined user PCC.<\/p>\n<p><strong>Where is the PCC for IEEE 519?<\/strong><\/p>\n<p>It is the defined source\/load interface for the installation, commonly established from the supply arrangement and ownership context.<\/p>\n<p><strong>What is the difference between THD and TDD?<\/strong><\/p>\n<p>THD uses the fundamental quantity at the measurement moment. Current TDD references maximum demand load current, IL.<\/p>\n<p><strong>How is TDD calculated?<\/strong><\/p>\n<p>TDD is harmonic current expressed as a percentage of the applicable maximum demand load current at the PCC.<\/p>\n<p><strong>What does Isc\/IL mean?<\/strong><\/p>\n<p>It compares available short-circuit current to maximum demand load current at the PCC and is used for current-distortion category selection.<\/p>\n<p><strong>Does IEEE 519 apply to voltage and current?<\/strong><\/p>\n<p>Yes. It includes separate steady-state distortion goals for voltage and current at the PCC.<\/p>\n<p><strong>How long should harmonic measurements be logged?<\/strong><\/p>\n<p>Long enough to capture representative maximum-demand and nonlinear-load operating conditions; define the period with the project team and measurement method.<\/p>\n<p><strong>Can an APF guarantee compliance?<\/strong><\/p>\n<p>No. An APF is evaluated against the measured system, project target, topology, source condition, and commissioning result.<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ul>\n<li><a href=\"https:\/\/standards.ieee.org\/ieee\/519\/10677\/\" rel=\"nofollow noopener\" target=\"_blank\">Ti\u00eau chu\u1ea9n IEEE 519-2022<\/a><\/li>\n<li><a href=\"https:\/\/library.e.abb.com\/public\/a7965e127ce44d089c1c2beace68aacd\/Tech_Note_158_IEEE_519-2022+Review.pdf\" rel=\"nofollow noopener\" target=\"_blank\">ABB: IEEE 519-2022 Review<\/a><\/li>\n<li><a href=\"https:\/\/www.mirusinternational.com\/downloads\/Mirus-White-Paper-Understanding-Relationship-between-THD-vs-TDD-20220330.pdf\" rel=\"nofollow noopener\" target=\"_blank\">Mirus: Understanding the Relationship Between THD and TDD<\/a><\/li>\n<li><a href=\"https:\/\/www.transcoil.com\/applications\/ieee-519-2014\/\" rel=\"nofollow noopener\" target=\"_blank\">TCI: IEEE 519-2022 Harmonic-Control Guide<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>IEEE 519 harmonic limits are a PCC-based design and verification framework for steady-state voltage and current distortion. Before an active power filter is sized, an engineer should define the user point of common coupling, identify whether voltage or current distortion is the decision issue, collect maximum-demand and short-circuit data, and obtain a representative harmonic record. [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2559","post","type-post","status-publish","format-standard","hentry","category-blog"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"acf":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/posts\/2559","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/comments?post=2559"}],"version-history":[{"count":1,"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/posts\/2559\/revisions"}],"predecessor-version":[{"id":2612,"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/posts\/2559\/revisions\/2612"}],"wp:attachment":[{"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/media?parent=2559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/categories?post=2559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnbygele.com\/vi\/wp-json\/wp\/v2\/tags?post=2559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}