ABB SACE Tmax XT2 - Page 47

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 47
OV Protection
Function
If one or more line-to-line voltages read by the unit exceeds the U9 threshold for a time greater
than t9, the protection sends the TRIP command.
To verify and simulate the trip times based on all the parameters, see:
 Protection summary table with the operating characteristics (page 79)
 Chart with tripping curve (page 88)
Parameters
Parameter
Description
Default
Enable
Enables/disables protection and availability on menu of the
parameters
OFF
Trip Enable
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
OFF
Threshold
U9
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
1.05 Un
Time t9
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
5 s
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.
UV2 Protection
Function
The UV2 Protection works like the UV Protection: if one or more line-to-line voltages read by the
unit falls below the U15 threshold for a time greater than t15, the protection sends the TRIP
command.
It is independent of UV 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
UV and opening command with UV2 or vice versa, or both for signaling or for tripping).
To verify and simulate the trip times based on all the parameters, see:
 Protection summary table with the operating characteristics (page 79)
 Chart with tripping curve (page 87)
Parameters
Parameter
Description
Default
Enable
Enables/disables protection and availability on menu of the
parameters
OFF
Trip Enable
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
OFF
Threshold
U15
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:
0.05 Un .. 1 Un with 0.01 Un step
0.9 Un
Time t15
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
5 s
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.