{"id":9148,"date":"2016-06-16T20:25:47","date_gmt":"2016-06-16T20:25:47","guid":{"rendered":"https:\/\/automation-electric.com\/pornire-stea-triunghi\/"},"modified":"2026-01-17T20:21:54","modified_gmt":"2026-01-17T20:21:54","slug":"pornire-stea-triunghi","status":"publish","type":"post","link":"https:\/\/automation-electric.com\/ro\/pornire-stea-triunghi\/","title":{"rendered":"Pornire stea-triunghi"},"content":{"rendered":"<\/p>\n<h6><strong>Protec\u021bie cu releu de suprasarcin\u0103 termic\u0103<\/strong><\/h6>\n<hr>\n<h6><strong>Mod de operare:<\/strong> C\u00e2nd se apas\u0103 butonul <strong>Start<\/strong>, bobina contactorului stea <strong>Q2<\/strong> este alimentat\u0103. Acesta se \u00eenchide \u0219i, prin intermediul contactului normal deschis al <strong>Q1<\/strong>, tensiunea este aplicat\u0103 contactorului principal <strong>Q1<\/strong>. <strong>Q1<\/strong> se \u00eenchide \u0219i alimenteaz\u0103 motorul <strong>M1<\/strong> \u00een conexiune stea. <strong>Q1<\/strong> \u0219i <strong>Q2<\/strong> sunt men\u021binute prin contacte normal deschise. Odat\u0103 ce contactorul principal <strong>Q1<\/strong> este alimentat, este alimentat \u0219i temporizatorul cu \u00eent\u00e2rziere la pornire <strong>T1<\/strong>, acesta av\u00e2nd dou\u0103 contacte, unul normal deschis (NO) \u0219i unul normal \u00eenchis (NC).   Dup\u0103 expirarea timpului setat, temporizatorul <strong>T1<\/strong> deschide circuitul <strong>Q2<\/strong> prin intermediul contactului NC \u0219i, prin intermediul contactului NO, \u00eenchide circuitul <strong>Q3<\/strong>. Contactorul stea <strong>Q2<\/strong> este deschis, iar bobina contactorului delta <strong>Q3<\/strong> este alimentat\u0103 \u0219i tensiunea complet\u0103 este aplicat\u0103 motorului <strong>M1<\/strong>. \u00cen acela\u0219i timp, contactul normal \u00eenchis (NC) al <strong>Q3<\/strong> \u00eentrerupe circuitul <strong>Q2<\/strong> \u0219i creeaz\u0103 o interblocare, astfel \u00eenc\u00e2t evit\u0103m func\u021bionarea simultan\u0103 a <strong>Q2, Q3<\/strong> \u00een timpul func\u021bion\u0103rii motorului.<br \/>O nou\u0103 pornire este posibil\u0103 numai dup\u0103 ap\u0103sarea butonului <strong>Stop<\/strong> sau dac\u0103 apare o suprasarcin\u0103, caz \u00een care contactul normal \u00eenchis 97-98 al releului de protec\u021bie a motorului TF1 este deschis.  <\/h6>\n<hr>\n<h6><strong>Calculul siguran\u021belor, contactorilor \u0219i al releului de suprasarcin\u0103 termic\u0103<\/strong><\/h6>\n<hr>\n<h6>\u00cenainte de a \u00eencepe orice tip de calcul, este important s\u0103 respecta\u021bi urm\u0103toarele reguli:<\/h6>\n<h6><strong>Regula nr. 1:<\/strong> Consulta\u021bi pl\u0103cu\u021ba motorului, acolo se g\u0103sesc informa\u021bii importante, cum ar fi puterea motorului, tensiunea, curentul absorbit, factorul de putere, randamentul motorului etc.; informa\u021bii pe care produc\u0103torul le-a ob\u021binut ca urmare a unui num\u0103r mare de calcule \u0219i teste.<\/h6>\n<h6><strong>Regula nr. 2:<\/strong> Dac\u0103 nu ave\u021bi informa\u021biile enumerate \u00een <strong>Regula nr. 1,<\/strong> utiliza\u021bi urm\u0103toarea formul\u0103 pentru calcul, care este puterea activ\u0103 a motorului:<\/h6>\n<h6 style=\"text-align: center;\"><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)<\/h6>\n<h6>P &#8211; putere activ\u0103 [W]<\/h6>\n<h6>U &#8211; tensiune [V]<\/h6>\n<h6>I &#8211; curent absorbit [A]<\/h6>\n<h6>cos\u2c77 &#8211; factor de putere<\/h6>\n<h6><strong>Exemplu de calcul:<\/strong><\/h6>\n<h6>Lu\u0103m ca exemplu un motor trifazat despre care \u0219tim c\u0103 are puterea de <strong>22 kW<\/strong>. Deci, avem datele ini\u021biale: <\/h6>\n<h6>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?P%3D22kW\" alt=\"\" name=\"equationview\"><\/h6>\n<h6>Tensiune 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 trifazat, sau tensiunea dumneavoastr\u0103 de alimentare (460, 690 V)<\/h6>\n<h6>Factor 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\"> = (0,6-0,95), deci alege\u021bi o medie de 0,8, cu excep\u021bia cazului \u00een care cunoa\u0219tem valoarea real\u0103.<\/h6>\n<h6>Din ecua\u021bia (1) ob\u021binem <strong>curentul de sarcin\u0103 maxim\u0103 (FLC)<\/strong> al motorului:<\/h6>\n<h6><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\"><\/h6>\n<h6>Acum, pentru <strong>contactorul stea Q2<\/strong>, curentul va fi calculat dup\u0103 cum urmeaz\u0103:<\/h6>\n<h6><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\">&nbsp;pentru <strong>releul de suprasarcin\u0103 termic\u0103 TF1, contactorii principali Q1 \u0219i delta Q3<\/strong>:<\/h6>\n<h6><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\"><\/h6>\n<h6 style=\"text-align: left;\">Pentru siguran\u021ba <strong>F1<\/strong>:<\/h6>\n<h6 style=\"text-align: center;\">&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\"><\/h6>\n<h6>Siguran\u021bele <strong>F2<\/strong> \u0219i <strong>F3<\/strong> pentru circuitul de comand\u0103 vor fi de <strong>1[A]<\/strong><\/h6>\n<p><span style=\"color: #000000;\">Acest produs arat\u0103 ca \u00een urm\u0103toarele imagini \u0219i poate fi cump\u0103rat folosind acest link: <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><\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Protec\u021bie cu releu de suprasarcin\u0103 termic\u0103 Mod de operare: C\u00e2nd se apas\u0103 butonul Start, bobina contactorului stea Q2 este alimentat\u0103. Acesta se \u00eenchide \u0219i, prin intermediul contactului normal deschis al<\/p>\n","protected":false},"author":1,"featured_media":9125,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[931],"tags":[],"class_list":["post-9148","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=\"description\" content=\"{:en}Pornire stea triunghi Pornirea motoarelor trifazate de mare putere Motoare{:}\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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