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MI 3108 EurotestPV Metingen AC laagspanningsinstallaties
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Meetprocedure voor foutlusimpedantie
Selecteer de subfunctie Zloop of Zs rcd met de functieschakelaars en
pijltjestoetsen
Selecteer de tesparameters (optioneel)
Verbind de testkabel met het toestel
Verbind de meetsnoeren met het te testen object (zie fig. 5.17 en 5.24)
Druk op TEST om de meting te starten
Sla het resultaat op door een druk op MEM (optioneel)
Figuur 5.25: Voorbeeld van resultaat lusimpedantiemeting
Resultaten:
Z ..............Foutlusimpedantie
ISC................... Vermoedelijke foutstroom
Lim ...........Onderste limietwaarde voor vermoedelike kortsluitstroom
De vermoedelijke foutstroom ISC wordt als volgt berekend op basis van de
meetimpedantie: ISC = UnxkSC
Z
waarbij:
Un ........ Nominale UL-PE spanning (zie onderstaande tabel)
ksc ....... Correctiefactor voor Isc (zie hoofdstuk 4.4.5)
Un
Ingangsspanning (L-PE)
110 V
(93 V U
L-PE
134 V)
230 V
(185 V UL-PE 266 V)
Opmerkingen:
Grote schommelingen in de netspanning kunnen de meetresultaten
beïnvloeden (het symbool verschijnt in het berichtenveld). In dit geval is
het raadzaam enkele metingen te herhalen om te controleren of de waarden
stabiel zijn.
Deze meting zal de RCD doen afschakelen in een RCD-beveiligde elektrische
installatie als test Zloop geselecteerd is.
Selecteer Zs rcd meting om de afschakeling van de RCD in een
RCD-beveiligde installatie te vermijden.
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