ABB SACE Tmax XT2 User Manual page 125

Protection If the reverse sequence measured by the Trip unit falls below the Uinv threshold, the
V INV corresponding alarm is activated (TRIP not envisaged).
[ANSI 59VI]
The protection submenu is available in the Protections-Advanced menu, where the following
parameters can be set:
Parameter
Enable
Threshold
VS Warning If all the three line-to-line voltages measured by the Trip unit are within the window defined by
the control thresholds for the time set, the warning signal is activated.
The control threshold submenu is available in the Protections-Advanced-Warnings menu, where
the following parameters can be set:
Parameter
Enable
Signal
source
DOWN
Threshold
UP
Threshold
Time
1SDH002031A1002 ECN000092998
Description
Enable/disable the control and the availability of the parameters in
the menu
Defines the value that triggers the alarm.
The value is expressed both in an absolute value (Volt) and a
relative value (Un), which can be set in a range:
0.05 Un .. 0.5 Un with 0.05 Un steps
Description
Enable/disable the control and the availability of the parameters in
the menu
Defines whether the line-to-line voltages to be checked are those
from the internal sockets (Measuring) or from the Ekip
Synchrocheck, if present.
NOTE: by setting Ekip Synchrocheck the control refers to
a single voltage
Defines the lower value of the control band, expressed both in an
absolute value (Volt) and a relative value (Un), which can be set in
a range: 0.5 Un .. 1 Un with 0.001 Un steps
Defines the upper value of the control band, expressed both in an
absolute value (Volt) and a relative value (Un), which can be set in
a range: 1 Un .. 1.5 Un with 0.001 Un steps
The control time that activates the signal. The value is expressed
in seconds, which can be set in a range:
0.1 s .. 900 s, with 0.1 s steps
Rev. B
Default
OFF
0.05 Un
Default
OFF
Meas.
0.9 Un
1.1 Un
30 s
SACE Tmax XT2 – XT4 | 125