Bender EDS440-L - Connection of W; Transformers; Eds441-Lab-4

MountingMounting
EDS44x_D00201_07_M_XXDE/06.2020
20
5.10.1 Connection of W…, WR…, WS… series measuring current
transformers
For insulation fault location, the measuring current transformers of the W… (closed),
WR… (rectangular) and WS… (split-core) series are used.
Connection of W…, WR…, WS… series measuring current trans-
formers
Terminals 1 and 2 as well as terminals 3 and 4 of the measuring current
transformer are bridged internally. The connections k and l must not be
interchanged on the EDS44x.
Live conductors and measuring current transformers
You must ensure that all live conductors are routed through the measur-
ing current transformer. Do not route any existing PE conductors or
shields of shielded cables through the measuring current transformer!
Standard measuring current transformers are not suitable for the EDS44x
system and must not be used. An accurate measurement result can only
be obtained if these notes are observed.
For further information regarding measuring current transformers, refer
to the respective data sheets.
A1
A2
L1
L2
K1
K2
L
L
KKL
k
l
CTAC 2
k
l
CTAC 1
5.10.2 Connection of W…AB series measuring current transformers to
EDS441-LAB-4
Power consumption of measuring current transformers
A maximum of 6 measuring current transformers can be connected to an
AN420 or AN110 power supply unit.
Locating current
The EDS441-LAB-4 operates exclusively with a locating current of
max. 5 mA. Therefore, selecting the current range > 500 mA on
the current transformer is not suitable for measuring locating
currents < 5 mA.
W...AB
b
a
CT1
A1
A2
l1
k1
l1k1
+12V GND -12V
A1 A1 A2A2
+12 V -12 VGND
AN420
EDS441-LAB-4
WXS ...
k:
l:
-12 V:
GND:
+12 V:
Yellow
Green
Black
Brown
Red
WXS…colour code: