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Electrical Installation Tester
Metingen
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Lusimpedantiemeting in IT-systeem
Om de lusimpedantie bij de netcontactdoos te meten, zet u de tester in IT-
modus (opstartoptie: + ). In de IT-modus accepteert de tester iedere
spanning tussen N en PE, maar zal de tester de lustest alleen met de
hogestroom-tripmodus uitvoeren. Zie afbeelding 6.
RLO
hwl055.eps
Afbeelding 6. Lusimpedantietest in IT-systeem
Lusimpedantie
Lijnimpedantie is bronimpedantie gemeten tussen de lijngeleiders of lijn en nul.
Deze functie laat de volgende tests toe:
Lijn naar Neutraal kringimpedantie.
Impedantie tussen lijn en lijn in 3-fasesystemen.
L-PE-lusmeting. Dit is een hogestroom, 2-draads lusmeting. Deze meting
kan niet worden gebruikt bij door aardlekschakelaars beschermde
stroomkringen, omdat de aardlekschakelaars door de meting uitschakelen.
Prospective Short Circuit Current (PSC) (te verwachten kortsluitstroom).
PSC is de stroom die potentieel kan vloeien wanneer de fasegeleider
wordt kortgesloten met de nulgeleider of een andere fasegeleider. De
tester berekent de PSC-stroom als de gemeten netspanning gedeeld door
de lijnimpedantie.
Lijnimpedantie meten:
1. Zet de draaiknop in de stand HI CURRENT. Zie tabel 15.
2. Sluit het rode snoer aan op de aansluiting L (rood) en het blauwe snoer op
de aansluiting N (blauwe) van de tester.
3. Druk op om L-N te selecteren.
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