{"id":5194,"date":"2024-07-27T10:50:27","date_gmt":"2024-07-27T02:50:27","guid":{"rendered":"https:\/\/www.zhengxi1983.com\/?post_type=product&#038;p=5194"},"modified":"2024-11-12T08:54:30","modified_gmt":"2024-11-12T00:54:30","slug":"3-phase-variable-voltage-transformer","status":"publish","type":"product","link":"https:\/\/www.zx-ele.com\/cs\/3-phase-variable-voltage-transformer\/","title":{"rendered":"TSJA 3f\u00e1zov\u00fd olejov\u00fd transform\u00e1tor s prom\u011bnn\u00fdm nap\u011bt\u00edm \u010cist\u00fd m\u011bd\u011bn\u00fd dr\u00e1t"},"content":{"rendered":"<p class=\"wp-block-paragraph\">T\u0159\u00edf\u00e1zov\u00fd olejov\u00fd induk\u010dn\u00ed transform\u00e1tor TSJA s prom\u011bnn\u00fdm nap\u011bt\u00edm m\u00e1 strukturu rotoru, k\u0159em\u00edkov\u00e9ho ocelov\u00e9ho plechu, c\u00edvky, \u0161nekov\u00e9ho p\u0159evodu, motorov\u00e9ho pohonu a trubky pro odvod tepla. Pomoc\u00ed mechanick\u00e9ho p\u0159evodu nastavuje f\u00e1zov\u00fd \u00fahel a m\u011bn\u00ed tak nap\u011bt\u00ed na sekund\u00e1rn\u00ed stran\u011b. Je t\u0159eba poznamenat, \u017ee tento typ prom\u011bnn\u00e9ho transform\u00e1toru nap\u011bt\u00ed s\u00e1m o sob\u011b nem\u00e1 funkci stabilizace nap\u011bt\u00ed. Ve srovn\u00e1n\u00ed s kontaktn\u00edm typem transform\u00e1toru m\u00e1 sice induk\u010dn\u00ed transform\u00e1tor prom\u011bnn\u00e9ho nap\u011bt\u00ed v\u011bt\u0161\u00ed vlastn\u00ed ztr\u00e1ty, ni\u017e\u0161\u00ed p\u0159esnost nap\u011bt\u00ed a vy\u0161\u0161\u00ed rozb\u011bhov\u00e9 nap\u011bt\u00ed, ale m\u00e1 vynikaj\u00edc\u00ed vlastnosti v oblasti odolnosti proti p\u0159et\u00ed\u017een\u00ed a nadproudu, tak\u017ee se \u0161iroce pou\u017e\u00edv\u00e1 p\u0159i blokov\u00e1n\u00ed motor\u016f, v\u00fdrob\u011b chemick\u00fdch hnojiv, v\u00fdrob\u011b oceli, galvanizaci a dal\u0161\u00edch rozs\u00e1hl\u00fdch zku\u0161ebn\u00edch oblastech t\u011b\u017ek\u00e9ho pr\u016fmyslu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-color has-link-color wp-elements-1\" style=\"color:#173994;font-size:26px\"><strong>Hlavn\u00ed technick\u00fd parametr<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Zna\u010dka<\/td><td>ZHENGXI<\/td><\/tr><tr><td>N\u00e1zev<\/td><td>Olejov\u00fd induk\u010dn\u00ed regul\u00e1tor nap\u011bt\u00ed<\/td><\/tr><tr><td>Frekvence<\/td><td>50Hz\/60Hz<\/td><\/tr><tr><td>Efektivita pr\u00e1ce<\/td><td>&gt;96%<\/td><\/tr><tr><td>Odolnost izolace<\/td><td>&gt;20MQ<\/td><\/tr><tr><td>Vhodn\u00e1 teplota<\/td><td>-10\u2103~45\u2103<\/td><\/tr><tr><td>Z\u00e1t\u011b\u017eov\u00fd proud<\/td><td>226,5A 346,5A 412,5A 456A 577A 693A<\/td><\/tr><tr><td>Okam\u017eit\u00e9 p\u0159et\u00ed\u017een\u00ed<\/td><td>&lt;180%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Produkt<\/strong>&nbsp;<strong>model<\/strong><strong><\/strong><\/td><td><strong>Vstup<\/strong>&nbsp;<strong>nap\u011bt\u00ed<\/strong><strong><\/strong><\/td><td><strong>V\u00fdstup<\/strong>&nbsp;<strong>nap\u011bt\u00ed<\/strong><strong><\/strong><\/td><td><strong>Hodnoceno<\/strong>&nbsp;<strong>v\u00fdstup<\/strong>&nbsp;<strong>proud(A)<\/strong><strong><\/strong><\/td><td><strong>Rozm\u011bry (mm)<\/strong><strong><\/strong><\/td><\/tr><tr><td>TSJA-30KVA<\/td><td rowspan=\"30\">380V<\/td><td>&nbsp;<\/td><td>46\u300142\u300135\u300127<\/td><td>128*176<\/td><\/tr><tr><td>TSJA-50KVA<\/td><td>&nbsp;<\/td><td>76\u300169\u300158\u300144<\/td><td>128*176<\/td><\/tr><tr><td>TSJA-75KVA<\/td><td>0~380V\u30010~420V\u30010~500V\u30010~650V<\/td><td>114\u3001103\u300187\u300167<\/td><td>128*176<\/td><\/tr><tr><td>TSJA-100KVA<\/td><td>&nbsp;<\/td><td>152\u3001138\u3001116\u300189<\/td><td>105*166<\/td><\/tr><tr><td>TSJA-125KVA<\/td><td rowspan=\"2\">0~420V\u30010~500V\u30010~650V<\/td><td>172\u3001144\u3001111<\/td><td>120*166<\/td><\/tr><tr><td>TSJA-140KVA<\/td><td>192\u3001162\u3001124<\/td><td>120*166<\/td><\/tr><tr><td>TSJA-160KVA<\/td><td>0~380V\u30010~420V\u30010~500V\u30010~650V<\/td><td>243\u3001220\u3001185\u3001142<\/td><td>120*166<\/td><\/tr><tr><td>TSJA-180KVA<\/td><td>0~650V<\/td><td>160<\/td><td>120*166<\/td><\/tr><tr><td>TSJA-200KVA<\/td><td>0~380V\u30010~420V\u30010~500V\u30010~650V<\/td><td>304\u3001275\u3001231\u3001178<\/td><td>142*171<\/td><\/tr><tr><td>TSJA-225KVA<\/td><td>0~650V<\/td><td>200<\/td><td>127*171<\/td><\/tr><tr><td>TSJA-250KVA<\/td><td>0~420V\u30010~500V\u30010~650V<\/td><td>344\u3001289\u3001222<\/td><td>152*209<\/td><\/tr><tr><td>TSJA-280KVA<\/td><td>0~650V<\/td><td>249<\/td><td>142*171<\/td><\/tr><tr><td>TSJA-315KVA<\/td><td>0~380V\u30010~420V\u30010~500V\u30010~650V<\/td><td>479\u3001433.364\u3001280<\/td><td>152*209<\/td><\/tr><tr><td>TSJA-350KVA<\/td><td>0~650V<\/td><td>311<\/td><td>152*209<\/td><\/tr><tr><td>TSJA-400KVA<\/td><td>0~420V\u30010~500V\u30010~650V<\/td><td>550\u3001462\u3001355<\/td><td>152*209<\/td><\/tr><tr><td>TSJA-450KVA<\/td><td>0~650V<\/td><td>400<\/td><td>152*209<\/td><\/tr><tr><td>TSJA-500KVA<\/td><td>0~380V\u30010~500V\u30010~650V<\/td><td>759\u3001577\u3001444<\/td><td>152*215<\/td><\/tr><tr><td>TSJA-630KVA<\/td><td>0~650V<\/td><td>560<\/td><td>158*258<\/td><\/tr><tr><td>TSJA-630\/6KVA<\/td><td>0~6300V<\/td><td>57.5<\/td><td>158*258<\/td><\/tr><tr><td>TSJA-630\/10KVA<\/td><td>0~10500V<\/td><td>34.6<\/td><td>158*258<\/td><\/tr><tr><td>TSJA-800KVA<\/td><td>0~650V<\/td><td>711<\/td><td>173*258<\/td><\/tr><tr><td>TSJA-800\/6KVA<\/td><td>0~6300V<\/td><td>73.3<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-800\/10KVA<\/td><td>0~10500V<\/td><td>44<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-1000KVA<\/td><td>0~650V<\/td><td>888<\/td><td>172*258<\/td><\/tr><tr><td>TSJA-1000\/6KVA<\/td><td>0~6300V<\/td><td>91.6<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-1000\/10KVA<\/td><td>0~10500V<\/td><td>55<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-1250KVA<\/td><td>0~650V<\/td><td>1110<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-1250\/6KVA<\/td><td>0~6300V<\/td><td>115<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-1250\/10KVA<\/td><td>0~10500V<\/td><td>68.7<\/td><td>215*275<\/td><\/tr><tr><td>TSJA-1600KVA<\/td><td>0~650V<\/td><td>1421<\/td><td>215*275<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Struktura a princip fungov\u00e1n\u00ed<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Konstrukce t\u0159\u00edf\u00e1zov\u00e9ho induk\u010dn\u00edho transform\u00e1toru s prom\u011bnn\u00fdm nap\u011bt\u00edm TSJA je podobn\u00e1 konstrukci dr\u00e1tov\u00e9ho induk\u010dn\u00edho motoru, ale jeho rotor je upevn\u011bn \u0161nekov\u00fdm p\u0159evodem a nem\u016f\u017ee se voln\u011b ot\u00e1\u010det, tak\u017ee jej lze nastavit ru\u010dn\u011b nebo elektricky, aby se dos\u00e1hlo po\u017eadovan\u00e9ho \u00fahlu. Jeho elektromagnetick\u00e9 vztahy jsou podobn\u00e9 jako u autotransform\u00e1toru.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u0159\u00edf\u00e1zov\u00e9 vinut\u00ed rotoru transform\u00e1toru s prom\u011bnn\u00fdm nap\u011bt\u00edm je zapojeno do hv\u011bzdy jako prim\u00e1rn\u00ed strana a je p\u0159ipojeno k t\u0159\u00edf\u00e1zov\u00e9mu nap\u00e1jen\u00ed p\u0159es t\u0159i kluzn\u00e9 krou\u017eky a uhl\u00edkov\u00e9 kart\u00e1\u010de. T\u0159\u00edf\u00e1zov\u00e9 statorov\u00e9 vinut\u00ed slou\u017e\u00ed jako sekund\u00e1rn\u00ed strana, kde je jeden konec ka\u017ed\u00e9ho f\u00e1zov\u00e9ho vinut\u00ed p\u0159ipojen k odpov\u00eddaj\u00edc\u00edmu konci rotorov\u00e9ho vinut\u00ed a druh\u00fd konec je p\u0159ipojen k z\u00e1t\u011b\u017ei.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kdy\u017e je rotorov\u00e9 vinut\u00ed p\u0159ipojeno k symetrick\u00e9mu t\u0159\u00edf\u00e1zov\u00e9mu nap\u00e1jen\u00ed, vznik\u00e1 ve vzduchov\u00e9 meze\u0159e to\u010div\u00e9 magnetick\u00e9 pole, co\u017e je stejn\u00fd princip \u010dinnosti jako u t\u0159\u00edf\u00e1zov\u00e9ho induk\u010dn\u00edho motoru. P\u016fsoben\u00edm to\u010div\u00e9ho magnetick\u00e9ho pole se ve statorov\u00e9m i rotorov\u00e9m vinut\u00ed indukuje elektrick\u00fd potenci\u00e1l. Vzhledem k s\u00e9riov\u00e9mu zapojen\u00ed je svorkov\u00e9 nap\u011bt\u00ed na sekund\u00e1rn\u00ed stran\u011b sou\u010dtem obou potenci\u00e1l\u016f. Proto\u017ee polohu statorov\u00e9ho a rotorov\u00e9ho vinut\u00ed lze m\u011bnit, bude se f\u00e1zov\u00fd pom\u011br potenci\u00e1l\u016f v obou vinut\u00edch li\u0161it v z\u00e1vislosti na poloze rotoru.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>V\u00fdkonnostn\u00ed charakteristiky<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tento v\u00fdrobek m\u016f\u017ee dlouhodob\u011b stabiln\u011b fungovat za n\u00e1sleduj\u00edc\u00edch podm\u00ednek:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">- bez chemicky agresivn\u00edch plyn\u016f a par.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">- Plynov\u00e9 prost\u0159ed\u00ed bez nebezpe\u010d\u00ed v\u00fdbuchu<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">- n\u00e1r\u016fst teploty povrchu oleje nep\u0159esahuje 55 \u2103 (maxim\u00e1ln\u00ed teplota povrchu oleje nep\u0159esahuje 95 \u2103, pokud je teplota okoln\u00edho m\u00e9dia 40 \u2103), n\u00e1r\u016fst teploty vinut\u00ed nep\u0159esahuje 65 \u2103, n\u00e1r\u016fst teploty j\u00e1dra nep\u0159esahuje 80 \u2103.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">- Teplotn\u00ed rozsah okoln\u00edho m\u00e9dia: +40\u00b0C a\u017e -25\u00b0C<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">- Relativn\u00ed vlhkost nep\u0159esahuj\u00edc\u00ed 85%<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">- Nadmo\u0159sk\u00e1 v\u00fd\u0161ka nejv\u00fd\u0161e 1000 metr\u016f nad mo\u0159em<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>N\u00e1vod k pou\u017eit\u00ed<\/strong><strong><\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zapojen\u00ed: jednof\u00e1zov\u00fd transform\u00e1tor prom\u011bnn\u00e9ho nap\u011bt\u00ed A, svorka X pro vstup, svorka a, x pro v\u00fdstup; t\u0159\u00edf\u00e1zov\u00fd transform\u00e1tor prom\u011bnn\u00e9ho nap\u011bt\u00ed A, B, C pro vstup, svorka a, b, c pro v\u00fdstup, svorka O pro nulov\u00fd bod hv\u011bzdy (ve tvaru Y).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lad\u011bn\u00ed: nov\u011b instalovan\u00fd nebo dlouho nepou\u017e\u00edvan\u00fd transform\u00e1tor s prom\u011bnn\u00fdm nap\u011bt\u00edm mus\u00ed p\u0159ed provozem pou\u017e\u00edt 500V megaohmmetrov\u00fd test izolace, kvalifikovan\u00fd p\u0159ed bezpe\u010dn\u00fdm pou\u017eit\u00edm. Pokud nen\u00ed zkou\u0161ka kvalifikovan\u00e1, je t\u0159eba prov\u00e9st o\u0161et\u0159en\u00ed su\u0161en\u00edm za tepla, obvykle pomoc\u00ed metody nab\u00edjen\u00e9ho su\u0161en\u00ed nebo odesl\u00e1n\u00ed do su\u0161\u00e1rny. Po vysu\u0161en\u00ed zkontrolujte, zda jsou upev\u0148ovac\u00ed prvky voln\u00e9, pokud jsou voln\u00e9, je t\u0159eba je ut\u00e1hnout.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Uzemn\u011bn\u00ed: transform\u00e1tor prom\u011bnn\u00e9ho nap\u011bt\u00ed mus\u00ed b\u00fdt dob\u0159e uzemn\u011bn, aby byla zaji\u0161t\u011bna bezpe\u010dnost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Soub\u011b\u017en\u00e9 pou\u017eit\u00ed: nesm\u00ed se pou\u017e\u00edvat soub\u011b\u017en\u011b.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Omezen\u00ed nap\u011bt\u00ed: Vstupn\u00ed nap\u011bt\u00ed nesm\u00ed p\u0159ekro\u010dit 105% jmenovit\u00e9ho nap\u011bt\u00ed (tj. 105% U jmenovit\u00e9ho p\u0159\u00edkonu), aby nedo\u0161lo k po\u0161kozen\u00ed transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed nebo jin\u00fdch za\u0159\u00edzen\u00ed. Pokud se nepou\u017e\u00edv\u00e1, m\u011blo by b\u00fdt v\u00fdstupn\u00ed nap\u011bt\u00ed nastaveno na 0 V a vstupn\u00ed nap\u00e1jen\u00ed by m\u011blo b\u00fdt odpojeno.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Jmenovit\u00fd proud: jmenovit\u00fd nap\u00e1jec\u00ed proud transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed je v\u00fdstupn\u00ed proud transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed. Vypo\u010d\u00edt\u00e1 se takto: I2 = P2UomaxI2 = \\frac{P2}{Uo_{\\text{max}}}I2=UomaxP2 kde I2 je jmenovit\u00fd v\u00fdstupn\u00ed proud, P2 je jmenovit\u00fd v\u00fdkon, Uo_max je maxim\u00e1ln\u00ed v\u00fdstupn\u00ed nap\u011bt\u00ed. Je t\u0159eba poznamenat, \u017ee v\u00fdstupn\u00ed proud by nem\u011bl p\u0159ekro\u010dit jmenovitou hodnotu. Kr\u00e1tkodob\u00e9 p\u0159et\u00ed\u017een\u00ed by m\u011blo b\u00fdt \u0159\u00edzeno v rozsahu uveden\u00e9m v tabulce 3, jinak m\u016f\u017ee zkr\u00e1tit \u017eivotnost prom\u011bnn\u00e9ho transform\u00e1toru nap\u011bt\u00ed nebo dokonce v\u00e9st k jeho po\u0161kozen\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Provoz: P\u0159i se\u0159izov\u00e1n\u00ed je t\u0159eba rukojet\u00ed ot\u00e1\u010det pomalu a rovnom\u011brn\u011b, aby nedo\u0161lo k po\u0161kozen\u00ed kart\u00e1\u010d\u016f nebo jisk\u0159en\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00dadr\u017eba kart\u00e1\u010de: pravideln\u011b kontrolujte opot\u0159eben\u00ed kart\u00e1\u010de, v p\u0159\u00edpad\u011b nadm\u011brn\u00e9ho opot\u0159eben\u00ed nebo z\u00e1vad by m\u011bl b\u00fdt kart\u00e1\u010d v\u010das vym\u011bn\u011bn za kart\u00e1\u010d se stejn\u00fdmi specifikacemi a k ot\u00e1\u010den\u00ed ru\u010dn\u00edho kola pod kart\u00e1\u010dem pou\u017e\u00edvejte podlo\u017eky s nulov\u00fdm obsahem smirkov\u00e9ho pap\u00edru, aby byla brusn\u00e1 plocha kart\u00e1\u010de rovn\u00e1 a byl zaji\u0161t\u011bn dobr\u00fd kontakt. V\u00fdm\u011bna m\u011bd\u011bno-grafitov\u00fdch kompozitn\u00edch kart\u00e1\u010d\u016f mus\u00ed spl\u0148ovat specifikace.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u010ci\u0161t\u011bn\u00ed: Kontaktn\u00ed plocha mezi c\u00edvkou a kart\u00e1\u010dem mus\u00ed b\u00fdt \u010dist\u00e1, aby nedo\u0161lo k jisk\u0159en\u00ed nebo sp\u00e1len\u00ed c\u00edvky. Pokud se na povrchu c\u00edvky objev\u00ed \u010dern\u00e9 skvrny, ot\u0159ete je alkoholem 90%.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dr\u00e1ty: Vodi\u010de a svorky od zdroje nap\u00e1jen\u00ed k transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed a od transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed k z\u00e1t\u011b\u017ei by m\u011bly b\u00fdt v dobr\u00e9m kontaktu a m\u011bly by b\u00fdt schopny odolat jmenovit\u00e9mu proudu transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Manipulace: transform\u00e1tor s prom\u011bnn\u00fdm nap\u011bt\u00edm by m\u011bl b\u00fdt p\u0159en\u00e1\u0161en pomoc\u00ed rukojeti, vyhn\u011bte se zved\u00e1n\u00ed pomoc\u00ed ru\u010dn\u00edho kole\u010dka.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mont\u00e1\u017e: Pokud je t\u0159eba transform\u00e1tor nap\u011bt\u00ed namontovat vodorovn\u011b na panel (pouze konstrukce jednotkov\u00e9ho transform\u00e1toru nap\u011bt\u00ed) nebo svisle na jinou z\u00e1kladnu, lze jej upevnit pomoc\u00ed mont\u00e1\u017en\u00edch otvor\u016f v z\u00e1kladn\u011b transform\u00e1toru nap\u011bt\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Udr\u017eujte \u010distotu: vnit\u0159ek transform\u00e1toru prom\u011bnn\u00e9ho nap\u011bt\u00ed by m\u011bl b\u00fdt udr\u017eov\u00e1n v suchu a \u010distot\u011b, nesm\u00ed se v n\u011bm nach\u00e1zet kapky vody, olej a jin\u00e9 ne\u010distoty. Pravideln\u00fdmi v\u00fdpadky nap\u00e1jen\u00ed odstra\u0148te nahromad\u011bn\u00fd vnit\u0159n\u00ed prach.<\/p>","protected":false},"featured_media":5198,"template":"","product-category":[97,70],"class_list":["post-5194","product","type-product","status-publish","has-post-thumbnail","hentry","product-category-three-phase","product-category-variable-transformer"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Oil-Immersed 3 phase variable voltage transformer pure copper wire | Safe and reliable operation | ZHENGXI<\/title>\n<meta name=\"description\" content=\"ZHENGXI specializes in Oil-Immersed 3 phase variable voltage transformer pure copper wire , Non-contact regulation, long service life. 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