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44 GMC-I Messtechnik GmbH
4.5 Kapazitätsmessung und Ermittlung der dielektrischen Entladung
Die Kapazitätsmessung erfolgt mit einstellbarer Prüfspannung
durch Aufladen der Kapazität mit konstantem Strom. Die Mes-
sung erfolgt mit automatischer Bereichswahl. Als Messspannung
kann eine der Nenn-Prüfspannungen U
NENN
oder die frei einstell-
bare Prüfspannung U
VAR
eingestellt werden.
Dielektrischer Entladungstest (DD)
Dieser Test wurde zur Anwendung bei großen Maschinen ent-
wickelt und wird, wie der Name sagt, während der Entladung vor-
genommen. Er bezeichnet das Verhältnis vom Entladestrom nach
1 Minute zum Produkt aus Spannung und Kapazität:
DD-Werte > 4: Fehlersuche ist erforderlich
DD-Werte = 2 4 Wartung ist empfehlenswert
DD-Werte < 2 Prüfling in Ordnung,
unmittelbare Aktionen nicht erforderlich.
Anwendung: Feststellen des Niveaus der absorbierten Verschmut-
zung bzw. Feuchtigkeit.
TEST
Prüfung auswählen
MENU
Untermenü aufrufen
4.5.1 Prüfparameter einstellen
Parameter einstellen
Zurücksetzen der Parameterwerte auf die der Werkseinstellung,
siehe Seite 22.
DD
I
Entlad
1min()
UC
-----------------------------
1000=
44


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