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7.4 (RCD-)Aardlekschakelingen testen in TN-S-netten
Aansluiting
Een RCD-schakelaar kan alleen worden gebruikt in een TN-S-net.
In een TN-C-net zou een RCD-schakelaar niet werken, omdat de
PE niet langs de RCD-schakelaar loopt, maar rechtstreeks in de
contactdoos verbonden is met de N-leider. Een foutstroom zou
dus via de RCD-schakelaar terugstromen en geen verschilstroom
genereren die de RCD-schakelaar aanspreekt.
De weergave van de contactspanning zal meestal eveneens 0,1 V
zijn, omdat de nominale lekstroom van 30 mA samen met de lage
lusweerstand een zeer kleine spanning oplevert:
7.5 (RCD-)aardlekschakelingen testen in IT-netten met hoog
kabelvermogen (bv. in Noorwegen)
Bij de RCD-metingen U
I Δ N
(I
Δ N
, t
a
) en de aardingsmeting (R
E
)
kan de netvorm (TN/TT of IT) worden ingesteld.
Bij metingen in het IT-net is een sonde absoluut noodzakelijk,
omdat de optredende contactspanning U
IΔN
niet zonder sonde
kan worden gemeten.
Als op het IT-net wordt omgeschakeld, wordt het aansluitingstype
automatisch met de sonde gekozen.
Parameter instellen – netvorm kiezen
Meting starten
UIΔNR
E
IΔN 1Ω 30mA 30mV 0 03V,== ==
Netvorm:
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