ABB SACE Tmax XT5 Operation And Maintenance Manual page 53

OV Protection
t
OV
U9
t9
UV2 Protection
t
UV2
U15
t15
51 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
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 80)
• the graph with trip curve (page 89)
Parameters
Parameter Description
V
Activates/deactivates the protection and its availability in the parameters
Enable
menu
Activates/deactivates transmission of the open command: if disabled, the
Trip Enable
alarm and exceedance of protection time are only managed as information
Establishes the value that activates the protection.
Threshold U9 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
This is the trip time of the protection; the value is given in seconds and can
Time t9
be set within a range: 0.05 s to 120 s, in 0.01 s steps
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 72).
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 80)
v
• the graph with trip curve (page 88)
Parameters
Parameter Description
Activates/deactivates the protection and its availability in the parameters
Enable
menu
Activates/deactivates transmission of the open command: if disabled, the
Trip Enable
alarm and exceedance of protection time are only managed as information
Establishes the value that activates the protection.
Threshold
The value is given as both absolute value (Volts) and relative value (Un) and
U15
can be set within the range: 0.05 Un to 1 Un in 0.001 Un steps
This is the trip time of the protection; the value is given in seconds and can
Time t15
be set within a range: 0.05 s to 120 s, in 0.01 s steps
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 72).
ABB | SACE Tmax XT
Default
OFF
OFF
1,05 Un
5 s
Default
OFF
OFF
0,9 Un
5 s
Protections | 2 - Voltage protections