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MI 3108 EurotestPV Metingen AC laagspanningsinstallaties
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Figuur 5.29: Voorbeelden van resultaten van lijnimpedantiemeting
Resultaten:
Z ............. Lijnimpedantie
ISC................... Vermoedelijke kortsluitstroom
Lim........... Onderste limietwaarde voor vermoedelijke kortsluitstroom
Vermoedelijke kortsluitstroom wordt als volgt berekend:: ISC = Un x kSC
Z
waarbij:
Un ........ Nominale L-N of L1-L2 spanning (zie onderstaande tabel)
ksc ....... Correctiefactor voor Isc (zie hoofdstuk 4.5.5).
Un
Ingangsspanning (L-N ou L1-L2)
110 V
(93 V UL-N < 134 V)
230 V
(185 V UL-N 266 V)
400 V
(321 V < U
L-L
485 V)
Noot:
Grote schommelingen in de netspanning kunnen de meetresultaten beïnvloeden (het
ruissymbool verschijnt in het berichtenveld). In zulk geval is het raadzaam enkele
metingen te herhalen om te controleren of de waarden stabiel zijn.
5.6.2 Spanningsval
Spanningsval wordt berekend op basis van het verschil tussen de lijnimpedantie aan de
verbindingspunten (stekker- en de lijnimpedantie aan het referentiepunt (gewoonlijk de
impedantie aan het schakelbord).
Circuits voor het meten van spanningsval
Figuur 5.30: Spanningsvalmeting fase-nulgeleider of fase-fase / verbinding van
plugcommander en 3-draadsnoer
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