ABB | SACE Tmax XT
54 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Protections | 8 - Voltage protections
OV Protection
U9
t
t9
V
OV
Function
The protection sends a TRIP command if one or more line-to-line voltages detected by the unit exceed
threshold U9 for longer than t9.
To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 88)
• the graph with trip curve (page 100)
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the parameters
menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled, the
alarm and exceedance of protection time are only managed as information
OFF
Threshold U9
Establishes the value that activates the protection.
The value is given as both absolute value (Volts) and relative value (Un) and
can be set within the range: 1 Un to 1.5 Un in 0.001 Un steps
1,05 Un
Time t9
This is the trip time of the protection; the value is given in seconds and can
be set within a range: 0.05 s to 120 s, in 0.01 s steps
5 s
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 75).
UV2 Protection
U15
t
t15
v
UV2
Function
UV2 protection functions in the same way as UV protection: the protection sends a TRIP command if one or
more line-to-line voltages detected by the unit drop below threshold U15 for longer than t15.
It is independent of UV protection, thus thresholds and functions of the two protections can be programmed
so as to take advantage of different plant solutions (example: signaling with UV and open command with UV2
or vice versa, or both for signaling or tripping).
To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 88)
• the graph with trip curve (page 99)
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the parameters
menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled, the
alarm and exceedance of protection time are only managed as information
OFF
Threshold
U15
Establishes the value that activates the protection.
The value is given as both absolute value (Volts) and relative value (Un) and
can be set within the range: 0.05 Un to 1 Un in 0.001 Un steps
0,9 Un
Time t15
This is the trip time of the protection; the value is given in seconds and can
be set within a range: 0.05 s to 120 s, in 0.01 s steps
5 s
Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 75).
