ABB SACE Tmax XT2 - Page 125

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 125
Protection
V INV
[ANSI 59VI]
If the reverse sequence measured by the Trip unit falls below the Uinv threshold, the
corresponding alarm is activated (TRIP not envisaged).
The protection submenu is available in the Protections-Advanced menu, where the following
parameters can be set:
Parameter
Description
Default
Enable
Enable/disable the control and the availability of the parameters in
the menu
OFF
Threshold
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
0.05 Un
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
Description
Default
Enable
Enable/disable the control and the availability of the parameters in
the menu
OFF
Signal
source
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
Meas.
DOWN
Threshold
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
0.9 Un
UP
Threshold
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
1.1 Un
Time
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
30 s