{"id":9168,"date":"2016-06-16T20:25:47","date_gmt":"2016-06-16T20:25:47","guid":{"rendered":"https:\/\/automation-electric.com\/pornire-stea-triunghi-2\/"},"modified":"2026-01-17T20:57:16","modified_gmt":"2026-01-17T20:57:16","slug":"pornire-stea-triunghi-2","status":"publish","type":"post","link":"https:\/\/automation-electric.com\/ro\/pornire-stea-triunghi-2\/","title":{"rendered":"Pornire stea-triunghi"},"content":{"rendered":"<p><span style=\"color: #000000;\"><strong>Protec\u021bie cu releu termic<\/strong><\/span><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>Mod de operare:<\/strong> La ap\u0103sarea butonului&nbsp;<strong>Start<\/strong> se energizeaz\u0103<strong>&nbsp;<\/strong>bobina contactorului stea <strong>Q2<\/strong>. Acesta anclan\u0219eaz\u0103 \u0219i prin contactul normal deschis al <strong>Q1<\/strong> aplic\u0103 tensiune pe contactorul de re\u021bea &nbsp;<strong>Q1. Q1<\/strong> anclan\u0219eaz\u0103 \u0219i alimenteaz\u0103 motorul <strong>M1<\/strong> cu tensiunea re\u021belei \u00een conexiune stea. <strong>Q1<\/strong> \u0219i <strong>Q2<\/strong> se automen\u021bin prin contactele normal deschise. Odat\u0103 cu contactorul de re\u021bea <strong>Q1<\/strong> este alimentat \u0219i releul de timp <strong>T1<\/strong>, care are dou\u0103 contacte, unul normal deschis (NO) \u0219i unul normal \u00eenchis (NC).  Corespunz\u0103tor timpului de comutare reglat, <strong>T1<\/strong> deschide circuitul lui <strong>Q2<\/strong> prin contactul NC, iar prin contactul NO, \u00eenchide circuitul lui <strong>Q3<\/strong>. Contactorul stea <strong>Q2<\/strong> cade. Contactorul triunghi <strong>Q3<\/strong> anclan\u0219eaz\u0103 \u0219i aplic\u0103 motorului M1 \u00eentreaga tensiune a re\u021belei. \u00cen acela\u0219i timp, contactul normal \u00eenchis al <strong>Q3<\/strong> \u00eentrerupe circuitul lui <strong>Q2<\/strong> \u0219i interblocheaz\u0103 o nou\u0103 conectare a acestuia \u00een timpul func\u021bion\u0103rii motorului. <\/span><br \/><span style=\"color: #000000;\">O nou\u0103 pornire este posibil\u0103 numai dup\u0103 ap\u0103sarea butonului <strong>Stop<\/strong> sau dac\u0103 s-a produs declan\u0219area la suprasarcin\u0103 prin contactul normal \u00eenchis 97-98 al releului de protec\u021bie a motorului <strong>TF1<\/strong>.<\/span><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>Calculul siguran\u021belor fuzibile, contactoarelor \u0219i a releului termic&nbsp;<\/strong><\/span><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u00cenainte de a \u00eencepe orice tip de calcul, este important s\u0103 se respecte urm\u0103toarele reguli:<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>Regula nr. 1<\/strong>: Consulta\u021bi pl\u0103cu\u021ba motorului, aici se g\u0103sesc informa\u021bii importante, cum ar fi puterea motorului, tensiune, curent absorbit, factorul de putere, randament, etc.; informa\u021bii pe care produc\u0103torul le-a ob\u021binut ca urmare a unui num\u0103r important de calcule \u0219i teste.<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>Regula nr. 2<\/strong>: Dac\u0103 nu ave\u021bi informa\u021biile enumerate la regula nr.1, utiliza\u021bi urm\u0103toarea formul\u0103 de calcul, care este puterea activ\u0103 a motorului:<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\"><strong><img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?P%3D%5Csqrt%7B3%7D*U*I*cos%5Cvarphi\" alt=\"\" name=\"equationview\">&nbsp;&nbsp;<\/strong> &nbsp; &nbsp; &nbsp; &nbsp;(1)<\/span><\/p>\n<p><span style=\"color: #000000;\">P- putere activ\u0103 [W]<\/span><\/p>\n<p><span style=\"color: #000000;\">U- tensiune alimentare [V]<\/span><\/p>\n<p><span style=\"color: #000000;\">I- curent absorbit [A]<\/span><\/p>\n<p><span style=\"color: #000000;\"><img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?cos%5Cvarphi\" alt=\"\" name=\"equationview\">&nbsp;&#8211; factor de putere<\/span><\/p>\n<p><span style=\"color: #000000;\"><strong>Exemplu de calcul:<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">Lu\u0103m ca exemplu un motor trifazat despre care \u0219tim c\u0103 are puterea de <strong>22 kW<\/strong>. Deci, avem urm\u0103toarele date ini\u021biale: <\/span><\/p>\n<p><span style=\"color: #000000;\">Putere motor&nbsp;<img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?P%3D22kW\" alt=\"\" name=\"equationview\"><\/span><\/p>\n<p><span style=\"color: #000000;\">Tensiunea de alimentare  <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?U%3D400%20V\" alt=\"\" name=\"equationview\"> fiind un motor trifazic, sau alt\u0103 tensiune de alimentare (460, 690 V)<\/span><\/p>\n<p><span style=\"color: #000000;\">Factorul de putere <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?cos%5Cvarphi%3D0.8\" alt=\"\" name=\"equationview\"> \u00een general <img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?cos%5Cvarphi\" alt=\"\" name=\"equationview\">= (0.6-0.90), \u00een cazul \u00een care nu \u0219tim valoarea exact\u0103, alegem 0.8.<\/span><\/p>\n<p><span style=\"color: #000000;\">Din ecua\u021bia (1) ob\u021binem curentul nominal al motorului:<\/span><\/p>\n<p><span style=\"color: #000000;\"><img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?I_%7BFLC%7D%3D%5Cfrac%7BP%7D%7B%5Csqrt%7B3%7D*U*cos%5Cvarphi%7D%3D%5Cfrac%7B22000%7D%7B1.732*400*0.8%7D%3D39.69%5BA%5D\" alt=\"\" name=\"equationview\"><\/span><\/p>\n<p><span style=\"color: #000000;\">A\u0219adar, pentru <strong>contactorul stea Q2<\/strong>, curentul va fi calculat dup\u0103 cum urmeaz\u0103:<\/span><\/p>\n<p><span style=\"color: #000000;\"><img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?I%3D%5Cfrac%7B1%7D%7B3%7D*I_%7BFLC%7D%3D0.33*I_%7BFLC%7D%3D%5Cfrac%7B39.69%7D%7B3%7D%3D13.23%5BA%5D\" alt=\"\" name=\"equationview\">pentru <strong>releul termic TF1, contactorul principal Q1 \u0219i contactorul triunghi Q3<\/strong>:<\/span><\/p>\n<p><span style=\"color: #000000;\"><img decoding=\"async\" id=\"equationview\" class=\"aligncenter\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?I%3D%5Cfrac%7B1%7D%7B%5Csqrt%7B3%7D%7D*I_%7BFLC%7D%3D0.58*I_%7BFLC%7D%3D%5Cfrac%7B39.69%7D%7B1.732%7D%3D22.91%5BA%5D\" alt=\"\" name=\"equationview\"><\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"color: #000000;\">Siguran\u021ba <strong>F1<\/strong> trebuie s\u0103 fie de 2.5 &#8211; 3 ori mai mare dec\u00e2t curentul nominal:<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #000000;\">&nbsp;<img decoding=\"async\" id=\"equationview\" title=\"Aceasta este forma redat\u0103 a ecua\u021biei. Nu pute\u021bi edita acest lucru direct. F\u0103c\u00e2nd clic dreapta, ve\u021bi avea op\u021biunea de a salva imaginea, iar \u00een majoritatea browserelor pute\u021bi trage imaginea pe desktop sau \u00eentr-un alt program.\" src=\"https:\/\/latex.codecogs.com\/gif.latex?I%3D%282.5%5Cdiv%203%29*I_%7BFLC%7D%3D39.69*3%5Ccong%20120%5BA%5D\" alt=\"\" name=\"equationview\"><\/span><\/p>\n<p><span style=\"color: #000000;\">Siguran\u021bele <strong>F2<\/strong> \u0219i <strong>F3<\/strong> pentru circuitul de comand\u0103 vor avea valoarea de <strong>1[A]<\/strong><\/span><\/p>\n<p><span style=\"color: #000000;\">A\u0219a arat\u0103 un produs pe care \u00eel fabric\u0103m noi, care poate fi achizi\u021bionat online folosind urm\u0103torul link:<\/span> <a href=\"https:\/\/automation-electric.com\/shop\/three-phase-motor-starters-2\/star-delta-starters\/\">https:\/\/automation-electric.com\/ro\/shop\/three-phase-motor-starters\/star-delta-starters\/<\/a><\/p>\n<p>[:]<\/p>\n\n<ul class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><li class=\"blocks-gallery-item\"><figure><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/automation-electric.com\/wp-content\/uploads\/2013\/09\/SAM_1174-1024x683.jpg\" alt=\"\" data-id=\"2469\" data-link=\"https:\/\/automation-electric.com\/?attachment_id=2469\" class=\"wp-image-2469\" srcset=\"https:\/\/automation-electric.com\/wp-content\/uploads\/2013\/09\/SAM_1174-1024x683.jpg 1024w, https:\/\/automation-electric.com\/wp-content\/uploads\/2013\/09\/SAM_1174-300x200.jpg 300w, https:\/\/automation-electric.com\/wp-content\/uploads\/2013\/09\/SAM_1174-768x512.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" src=\"https:\/\/i0.wp.com\/automation-electric.com\/wp-content\/uploads\/2020\/06\/SAM_2035.jpg?fit=604%2C340&amp;ssl=1\" alt=\"\" data-id=\"3862\" data-link=\"https:\/\/automation-electric.com\/pornirea-stea-triunghi\/sam_2035\/\" class=\"wp-image-3862\"\/><\/figure><\/li><\/ul>\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Protec\u021bie cu releu termic Mod de operare: La ap\u0103sarea butonului&nbsp;Start se energizeaz\u0103&nbsp;bobina contactorului stea Q2. Acesta anclan\u0219eaz\u0103 \u0219i prin contactul normal deschis al Q1 aplic\u0103 tensiune pe contactorul de re\u021bea<\/p>\n","protected":false},"author":1,"featured_media":9170,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[931],"tags":[],"class_list":["post-9168","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pornirea-motoarelor-trifazate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pornire stea-triunghi | Automation-Electric<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/automation-electric.com\/ro\/pornire-stea-triunghi-2\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pornire stea-triunghi | Automation-Electric\" \/>\n<meta property=\"og:description\" content=\"Protec\u021bie cu releu termic Mod de operare: La ap\u0103sarea butonului&nbsp;Start se energizeaz\u0103&nbsp;bobina contactorului stea Q2. 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