ABB eVM1 Installation And Service Instructions Manual page 55

See figure below for I1 Dip switch location on I/O board:
I/O board I/O board
Fig. 41
14.5.5.8 Close allowed in trip status
After a protection TRIP, the general Trip signal is latched, i.e. the signal status remains high after
all protections exit the TRIP status. It can be reset by means of the dedicated "Protection Trip
Signal Reset" input or the Reset pushbutton on the HMI. Until the trip reset is executed no close
command is accepted. This built-in logic requires an active operation (reset) before enabling re-
closing on a possible fault condition, as the CB was opened by a protection trip.
The "Close allowed in trip status" tick box enables this logic block to be overridden. When the
function is enabled (ticked) a close command can be executed before resetting the latched Trip
signal. The aim is to enable performance of re-closure cycles controlled by an external logic. A
typical example is a re-closure sequence (e.g. O-0.3s-CO- 3s CO - 15s – CO) on an overhead line
where transient faults may occur and be cleared by sequence.
14.5.5.9 Trip in case of current overflow
The IED monitors the currents up to 25 times the Nominal Primary Current value entered in the
General Settings, In. The protection setting range is limited to 20 times In.
Therefore under fault conditions the phase current signal will always "saturate" above the maximum
protection threshold set and the phase protection will always operate correctly.
Protections based on the calculation of current values (i.e. Unbalanced load and calculated Earth
fault) will be affected by the phase current signal saturation as it occurs separately on the three
phases, in particular for low values of the Nominal Primary Current when 25 In is lower than the
CB short-circuit rating (25 kA or 31 kA).
The "Trip in case of current overflow" tick box enables the function that will operate a Trip whenever
phase current saturation occurs. This function is not ticked by default and can only be enabled in
service access mode.
S1 S2 S3 S4 S1 S2 S3 S4
-XB34 -XB34
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