Page 42 - MCCB-XT2-XT4

ABB | SACE Tmax XT

G Protection Function
Ekip Touch calculates the vector sum of the phase currents (L1, L2, L3, Ne) and obtains the internal earth
t fault current (Ig): if current Ig exceeds threshold I4, the protection trips and, after a time established by
I4 G the value read and by the parameter settings, transmits the TRIP command.
To check and simulate the trip times in relation to all the parameters, please consult:
t4 • the summary table of the protections with the calculation formulas (page 75)
• the graph with trip curve (page 84)
Parameters
I
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu.
Activates/deactivates transmission of the open command. if
Trip Enable disabled, the alarm and exceedance of protection time are only ON
managed as information.
Establishes curve dynamics and the threshold or trip time
calculation:
Curve t = k
• t = k: fixed time trip
• t = k/I : inverse time-delay dynamic trip
2
Establishes the value that activates the protection and
contributes towards calculating the trip time.
Threshold I4 0,2 In
The value is given as both absolute value (A) and relative value (In)
and can be set within the range: 0.1 In to 1 In, in 0.001 In steps
It is the trip time or contributes towards timing calculation,
depending on the type of curve selected.
The value is given in seconds and can be set within the range: 0.1
Time t4 s to 1 s, in 0.05 s steps 0.1 s
NOTE: in the presence of curve: t = k, t4 can also be
configured as: instantaneous; in this mode, the trip time is
comparable to that given for I protection (page 75)
Warns that the measured current is near to the protection
activation threshold.
The value is given in percentage of threshold I1 and can be set
Prealarm I4 within the range 50% I4 to 90% I4, in 1% steps. 90 % I4
The prealarm condition deactivates in two cases:
• current lower than prealarm threshold I4
• current higher than threshold I4
Activates/deactivates the function and selectivity time availability
on the display (page 67)
ZoneSelectivity OFF
NOTE: the function is only available with curve t = k

This is the trip time of the protection with the zone selectivity
function activated and selectivity input not present (page 67)
Selectivity time 0,04 s
The value is given in seconds and can be set within the range:
0.04 s to 0.2 s, in 0.01 s steps
Activates/deactivates the function and availability of the
StartUp enable OFF
associated parameters on the display (page 70)
Protection threshold valid during Startup time, in the conditions
StartUp in which the function is activated (page 70) 0,2 In
Threshold The value is given as both absolute value (A) and relative value (In)
and can be set within the range: 0.2 In to 1 In, in 0.02 In steps
This is the time for which the StartUp threshold remains
activated, as calculated from the moment the activation
StartUp Time Threshold is exceeded (page 70) 0.1 s
The value is given in seconds and can be set within the range: 0.1
s to 30 s, in 0.01 s steps

Continued on the next page

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