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GMC-I Messtechnik GmbH 25
9 Het meten van de netimpedantie (functie ZL-N)
Meetprocédé (meten van de interne netweerstand)
De netimpedantie ZL-N wordt volgens hetzelfde meetprocédé
gemeten als de lusimpedantie ZL-PE (zie hoofdstuk 8op pag.23).
De stroomlus wordt hierbij via de nulleider N gevormd en niet via
de aardleiding PE zoals bij de lusimpedantiemeting .
Meetfunctie kiezen
Aansluiting TT-systeem
Aansluiting TN-S-systeem
Parameter instellen
IK
In het meetapparaat berekende kortsluitstroom (bij nominale
spanning)
Z Foute lusimpedantie
Ia Aanspreekstroom
(zie informatiebladen van de stroombrekers/zekeringen)
%
Eigen afwijking van het meetapparaat
TAB Grenswaarden volgens de Technische aansluitvoorwaar-
den voor aansluiting op het laagspanningsnet
tussen het distributienet en de meetinrichting
DIN Grenswaarde volgens DIN 18015-1: DU < 3 %
tussen meetinrichting en verbruiker
VDE Grenswaarde volgens DIN VDE 0100-520: DU < 4%
tussen distributienet en verbruiker
(hier instelbaar tot 10%)
De meting starten
ZL-N
Nominale stromen: 2...160 A
Aanspreekkarakteristieken: B/E,C,D,K
Doorsnede: 1,5 ... 70 mm²
Kabeltypes: NY..., H03... - H07...
Aantal aders: 2 ... 10 aders
Landspecifieke stekkerinzet bijv.
randaardecontactdoos
2-polige adapter
Limiet / grenswaarde:
IK < Limiet / grenswaarde
UL RL
IK
Limiet / grenswaarde:
U % > Limiet / grenswaarde
UL RL
U
25


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