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26 GMC-I Gossen-Metrawatt GmbH
8.2 Meting aardcircuitimpedantie
– meting achter een aardlekschakelaar
Het is mogelijk om de aardcircuitimpedantie L-PE in door aardlek-
schakelaars, met een minimale nominaalstroom van 30 mA,
beveiligde circuits te meten. Gedurende 2 sec. wordt met een
meetstroom van 15 mA gemeten en het meetreseltaat wordt met
een nauwkeurigheid van ±1 Ω getoond. Het meetbereik ligt tus-
sen 0,1 Ω en 99,9 Ω. De berekende kortsluitstroom wordt even-
eens getoond. De weergave van de maximaal toelaatbare beveili-
ging komt hierbij te vervallen. Bij toepassing van aardlekschake-
laars wordt de inwendige impedantie Zi gemeten om de juiste
beveiliging te controleren.
Deze meting wordt toepast in door aardlekschakelaars beveiligde
installaties waar voor bijvoorbeeld documentatie de waarde van
de aardcircuitweerstand vastgelegd moet worden.
In combinatie met een meting vóór de aardlekschakelaar is deze
meting voldoende nauwkeurig.
9 Meten van de inwendige weerstand van het net
(Z
I
)
Meetmethode
De inwendige impedantie Z
I
wordt volgens dezelfde meetme-
thode gemeten als de aardcircuitimpedantie Z
Schl
(zie hoofdstuk 8
op pagina 24). Het meetcircuit wordt nu niet via de bescher-
mingsleiding PE maar via de nul N gevormd.
Aansluitschema
MENU
START
Z
Schl
Z
I
26


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