Siemens SENTRON 3WL10 - External CT for Grounding Conductors of the Main Power Supply (Grounded Transformer Star Point) G_Ret Using the Ground Fault Return

3WL10
3VA27
L1
L2
L3
N
T5
PE
LN
L2
L3
L1
= ! 0
∑
I
T5 External current transformer for N conductor
3.5.3.2 External CT for grounding conductors of the main power supply (grounded
transformer star point) G_ret using the ground fault return
Currents in the grounding conductor of the transformer star point can be directly measured with
high accuracy using this toroidal-core transformer and can be evaluated with the ETU660 (LSIG).
The transformer is connected to the auxiliary conductor terminal system of the circuit breaker.
The external current transformer for the grounding conductor of the power supply is available
with rated currents 100 A and 250 A.
Direct measurement of ground currents is an alternative to the vector sum calculation.
L1
L2
L3
N
T6
PE
:/
9$
T6 External CT for grounding conductors of the main power supply (grounded transformer star point)
GF-CT
Accessories
3.5External accessories
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
114 Equipment Manual, 10/2023, L1V30499596002-03