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MI 3125/3125B EurotestCOMBO Fehlerschleifenimpedanz
44
5.5 Fehlerschleifenimpedanz und unbeeinflusster
Fehlerstrom
Eine Fehlerschleife ist eine Schleife, welche die Netzquelle, die Leitungsverdrahtung
und den Schutzerde-Rückpfad zur Netzquelle umfasst. Das Instrument misst die
Impedanz der Schleife und berechnet den Kurzschlussstrom. Die Messungen werden
durch Anforderungen der Norm EN 61557-3 abgedeckt.
Weitere Informationen über die
Tastenfunktionalität finden Sie in Kapitel 4.1,
Funktionsauswahl.
Bild 5.23: Fehlerschleifenimpedanz
Prüfparameter für die Fehlerschleifenimpedanzmessung
Test Auswahl der Unterfunktion Fehlerschleifenimpedanz [Zloop, Zs
rcd]
Sicherungstyp Wahl des Sicherungstyps [---, NV, gG, B, C, K, D]
Fuse I (Isich) Nennstrom der gewählten Sicherung
Fuse T (Tsich) Maximale Auslösezeit der gewählten Sicherung
Lim (Grenzwert) Minimaler Kurzschlussstrom der gewählten Sicherung
Sicherungs-Referenzdaten finden Sie in Anhang A.
Schaltungen für die Fehlerschleifenimpedanzmessung
L1
L2
L3
N
PE
R
E
Ro
LPEN
L/L1
N/L2PE/L3
Bild 5.24: Anschluss des Steckerkabels und des Universalprüfkabels
44


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