Table des Matières
Publicité
SOMMAIRE
DIMENSIONNEMENT DES TRANSFORMATEURS DE COMMANDE ET
ÉQUIPEMENT
WWW.LEGRAND.FR
Pourquoi un transformateur ? � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �2
Principe du transformateur � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �2
L'Isolement � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �3
Changement de tension � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �4
Fonctions secondaires � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �5
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Isolement standard � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �6
Isolement amélioré � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �6
Par application � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �7
Transformateurs de commande � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �7
Transformateurs pour équipement � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �7
Transformateurs d'installation standard � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �7
Transformateur s d'installation spécifique (Hospitalier) � � � � � � � � � � � � � � � � � � �7
Tableau de synthèse� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �8
Couplage série-parallèle � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �10
Protection au primaire et au secondaire � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �11
Prises de réglage au primaire � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �12
Tension à vide - tension en charge � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �13
Courant d'enclenchement � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �15
Puissance : effet du cos φ � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �16
Rendement � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �17
Pertes d'un transformateur � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �18
Classe de température � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �19
Puissance instantanée � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �19
Déclassement en fonction de la température ambiante � � � � � � � � � � � � � � �20
Questions diverses � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �22
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Circuits TBT (rappeler les tensions de sécurité en fonction des conditions
d'humidité) � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �24
1- La très basse tension de sécurité (TBTS) � � � � � � � � � � � � � � � �24
2- La très basse tension de protection (TBTP) � � � � � � � � � � � � � � �24
3- La très basse tension fonctionnelle (TBTF) � � � � � � � � � � � � � � �24
Changement de régime de neutre � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �24
GUIDE TECHNIQUE TRANSFORMATEURS BT-BT
1
Publicité
Table des Matières
