Page 48 - MCCB-XT2-XT4

ABB | SACE Tmax XT

OV Protection Function
The protection sends a TRIP command if one or more line-to-line voltages detected by the unit exceed
t threshold U9 for longer than t9.
U9 OV 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 76)
• the graph with trip curve (page 86)
t9
Parameters
V Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as OFF
information
Establishes the value that activates the protection.
Threshold
U9 The value is given as both absolute value (Volts) and relative value (Un) 1,05 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
Time t9 5 s
and can 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 67).

UV2 Protection Function
UV2 protection functions in the same way as UV protection: the protection sends a TRIP command if one
t or more line-to-line voltages detected by the unit drop below threshold U15 for longer than t15.
UV2
U15 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
t15 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:
v • summary table of the protections with the operating characteristics (page 76)
• the graph with trip curve (page 85)
Parameters
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as OFF
information
Establishes the value that activates the protection.
Threshold The value is given as both absolute value (Volts) and relative value (Un) 0,9 Un
U15
and 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
Time t15 5 s
and can 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 67).

46 | © 2022 ABB | 1SDH002031A1002 - ECN000212994 Protections | 3 - Voltage protections