ABB SACE Tmax XT2 User Manual page 48

OV2 Protection Function
The OV2 Protection works like the OV Protection: if one or more line-to-line voltages read by the
unit exceeds the U16 threshold for a time greater than t16, the protection sends the TRIP
command.
To verify and simulate the trip times based on all the parameters, see:


Parameters
Parameter
Enable
Trip Enable
Threshold
U16
Time t16
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.
Phase sequence Phase Sequence protection is triggered when the sequence of line-to-line voltages is not aligned
with the sequence set by the user.
The protection can be activated in the Advanced – Alerts – Phase sequence menu (page 27) and
the desired sequence set in the Settings - Phase sequence menu (page 29).
1SDH002031A1002 ECN000092998
Protection summary table with the operating characteristics (page 79)
Chart with tripping curve (page 88)
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 (Volt) and as a
relative value (Un), settable in a range:
1 Un .. 1.5 Un with 0.01 Un step
This is the trip time of the protection; the value is expressed in
seconds, which are settable in a range:
0.05 s.. 120 s, with 0.01 s step
Rev. B
Default
OFF
OFF
1.05 Un
5 s
SACE Tmax XT2 – XT4 | 48