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GMC-I Messtechnik GmbH 89
21.5 Lijst van de korte aanduidingen en hun betekenis
RCD-schakelaar (aardlekbeveiliging)
I
Δ
Aanspreekstroom
I
ΔN
Nominale foutstroom
I
F
Stijgende meetstroom (foutstroom)
PRCD Portable (mobiele) RCD
PRCD-S :
met aardleidingsherkenning resp. aardleidingsbewaking
PRCD-K:
met onderspanningsaanspreking en aardleidingsbewaking
RCD-
Selectieve RCD-aardlekschakelaar
R
E
Berekende aardingsweerstand resp. Aardlusweerstand
SRCD Socket (vast geïnstalleerde) RCD
t
a
Aanspreektijd / uitschakeltijd
U
IΔ
Contactspanning op het tijdstip van de aanspreking
U
IΔN
Contactspanning
met betrekking tot de nominale foutstroom I
Δ N
U
L
Grenswaarde voor de contactsspanning
Overstroombeveiliging
I
K
Berekende kortsluitstroom (bij nominale spanning)
Z
L-N
Netimpedantie
Z
L-PE
Lusimpedantie
Aarding
R
B
Weerstand van de systeemaarde
R
E
Gemeten aardingsweerstand
R
ESchl
Aardlusweerstand
Laagohmige weerstand van
Aardleidingen, aardgeleiders en potentiaalvereffeningsleidingen
R
LO+
Weerstand van potentialvereffeningsleidingen (+ pool naar
PE)
R
LO–
Weerstand van potentiaalvereffeningsleidingen (– pool
naar PE)
Isolatie
R
E(ISO)
Aardlekweerstand (DIN 51953)
R
ISO
Isolatieweerstand
R
ST
Standplaatsisolatieweerstand
Z
ST
Standplaatsisolatie-impedantie
Stroom
I
A
Uitschakelstroom
I
L
Lekstroom (meting met stroomtangtransformator)
I
M
Meetstroom
I
N
Nominale stroom
I
P
Meetstroom
Spanning
f Frequentie van de netspanning
f
N
Nominale frequentie van de netspanning
ΔU Spanningsval in %
U op de meetpennen gemeten spanning tijdens na de isola-
tiemeting van R
ISO
U
Batt
Accuspanning (batterijspanning)
U
E
Aardelektrodespanning
U
ISO
Bij meting van R
ISO
: Meetspanning, bij drempelfunctie:
Aanspreek- en doorslagspanning
U
L-L
Spanning tussen twee buitenste geleiders
U
L-N
Spanning tussen L en N
U
L-PE
Spanning tussen L en PE
U
N
Net-nominale spanning
U
3~
hoogste gemeten spanning bij het bepalen
van de draaiveldrichting
U
S-PE
Spanning tussen sonde en PE
U
Y
Leidingspanning ten opzichte van aarde
S
89


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