ABB SACE Tmax XT2 User Manual page 39

I Protection Function
If the current of one or more phases exceeds the I3 threshold, the protection is activated and,
after a fixed time that cannot be programmed, it sends the TRIP command.
To verify and simulate the trip times based on all the parameters, see:
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Parameters
Parameter
Enable
Threshold I3
StartUp
Enable
StartUp
threshold
StartUp time
Ekip M Touch
With Ekip M Touch the I protection is inhibited for 100 ms if the currents detected by the Trip unit
pass from none to at least one present (fixed control threshold at 0.25 In).
Constraints, limitations, and additional functions
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1SDH002031A1002 ECN000092998
Protection summary table with the operating characteristics (page 78)
Chart with tripping curve (page 85)
Description
Enables/disables protection and availability on menu of the
parameters
Defines the value that activates the protection.
The value is expressed both as an absolute value (Ampere) and as
a relative value (In), settable in a range:
1.5 In .. 10In with 0.1 In step
Activates/deactivates the function and display availability of the
combined parameters, see page 73 for details
Protection threshold valid during Startup time, in conditions in which
the function is active, see page 73 for details
The value is expressed both as an absolute value (Ampere) and as
a relative value (In), settable in a range:
1.5 In .. 15In with 0.1 In step
This is the time for which the StartUp threshold is active, calculated
from tripping of activation threshold, set details on page 73
The value is expressed in seconds, which are settable in a range:
0.1 s .. 30 s, with 0.01 s step
The I3 threshold must be greater than the I2 threshold (if the S and I protections are active)
I protection can be enabled with MCR protection disabled
From the service connector (with Ekip Connect) or with system bus communication it is also
possible to access the block functions, see page 70
Rev. B
Default
OFF
4 In
OFF
1.5 In
0.1 s
SACE Tmax XT2 – XT4 | 39