ABB SACE Tmax XT2 User Manual page 56

OF2 Protection Function
The OF2 Protection works like the OF Protection: if the grid frequency read by the unit exceeds
the f18 threshold for a time greater than t18, the protection sends the TRIP command.
It is independent of OF protection and it is therefore possible to program thresholds and functions
of the two protections to take advantage of different system solutions (example: signaling with
OF and opening command with OF2 or vice versa, or both for signaling or for tripping).
The protection automatically cuts out if the maximum line-to-line voltage value is less than 30 V.
To verify and simulate the trip times based on all the parameters, see:


Parameters
Parameter
Enable
Trip Enable
Threshold
f18
Time t18
Constraints, limitations, and additional functions
From the service connector (with Ekip Connect) or with system bus communication it is also
possible to access the block functions, see page70.
1SDH002031A1002 ECN000092998
Protection summary table with the operating characteristics (page 79)
Chart with tripping curve (page 90)
Description
Enables/disables protection and availability on menu of the
parameters
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
Defines the value that activates the protection.
The value is expressed both as an absolute value (Hertz) and as a
relative value (Fn), settable in a range:
1 Fn .. 1.1 Fn with 0.001 Fn step
This is the trip time of the protection; the value is expressed in
seconds, which are settable in a range:
0.06 s .. 300 s, with 0.01 s step
Rev. B
Default
OFF
OFF
1.1 Fn
3 s
SACE Tmax XT2 – XT4 | 56