Figure. 5.5.1 - 193. Low current and heavy unbalance.
If all of the measured phase magnitudes are below the
I
set
low limit setting, the function is not activated
even when the other conditions (inc. the unbalance condition) are met.
If the
I
set
high limit and I
set
low limit setting parameters are adjusted according to the application's
normal behavior, the operation of the function can be set to be very sensitive for broken circuit and
conductor faults.
Figure. 5.5.1 - 194. Normal situation, residual current also measured.
When the residual condition is added with the "I0 input selection", the sum of the current and the
residual current are compared against each other to verify the wiring condition.
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
302
