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L1
L2
L3
PE
R
E
Zi
L1
PE
L2
L
/
L
1
N
/L
2
P
E
/L
3
RCD
R
E2
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SPEICHERN
MEM
HILFE HELP
KAL CAL
IT 120 B
IT 120 B
Abbildung 11.3: FI/RCD-Prüfung im IT-Netz
11.3.4 Erstfehler-Leckstrom (ISFL)
Die ISFL-Messung wird durchgeführt, um den maximalen Strom zu messen, der von der geteste-
tenLeitungindenSchutzleiterießenkönnte.DieserStromießtdurchdenIsolationswiderstand
und -blindwiderstand (kapazitiv) zwischen dem Schutzleiter und den anderen Leitern.
Durchführung der Messung des Fehlerstroms im Falle des ersten Fehlers:
Schritt 1 Wählen Sie mit dem Funktionswahlschalter zuerst die Funktion ISOLATION/
INSULATIONaus.WählenSiedannmitdenTasten▲/▼dieFunktion„Strom(EF)“
(ISFL – Erstfehler-Strom) aus. Folgendes Menü wird angezeigt:
Abbildung 11.4: Messmenü für Fehlerstrom im Falle des ersten Fehlers
Schließen Sie das Prüfkabel an das Gerät BENNING IT 120 B an.
Schritt 2 Stellen Sie folgenden Grenzwert ein:
- Obergrenze des Stroms für den ersten Fehler.
Schritt 3 Schließen Sie das Prüfkabel an die zu prüfende Komponente an. Befolgen Sie zur
Durchführung der Fehlerstrommessung für den ersten Fehler den Anschlussplan in
Abbildung 11.5. Verwenden Sie bei Bedarf die Hilfe-Funktion.
75


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