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MI 3125/3125B EurotestCOMBO Erdungswiderstand
48
Der unbeeinflusste Kurzschlussstrom wird wie folgt berechnet:
Z
kUn
ISC
SC
Mit:
Un ........ Nennspannung L-N oder L1-L2 (siehe nachstehende Tabelle),
ksc ....... kK, Korrekturfaktor für Isc (siehe Kapitel 4.2.6).
Un Eingangsspannungsbereich (L-N
oder L1-L2)
115 V (100 V UL-N 160 V)
230 V (160 V UL-N 264 V)
400 V (264 V UL-N 440 V)
Hinweis:
Starke Schwankungen der Netzspannung können die Messergebnisse
beeinflussen. (Das Zeichen „Rauschen“ wird im Meldungsfeld angezeigt.) In
diesem Fall wird empfohlen, einige Messungen zu wiederholen, um zu
überprüfen, ob die Anzeigen stabil sind.
5.6.2 Spannungsabfall
Der Spannungsabfall wird anhand der Differenz zwischen der Leitungsimpedanz an den
Anschlussstellen (Buchsen) und der Leitungsimpedanz an einer Referenzstelle (in der
Regel die Impedanz an der Zentrale).
Anschlüsse für die Messung des Spannungsabfalls
Bild 5.30: Spannungsabfallmessung Phase-Nullleiter oder Phase-Phase – Anschluss
des Plug Commanders (Netzsteckeradapter) und des Universalprüfkabels
48


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