ABB SACE Tmax XT5 Operation And Maintenance Manual page 58

RV Protection
t
U22
t22
56 | © 2019 ABB | 1SDH002039A1002 - ECN000093027 - Rev. A
Function
The protection trips if loss of insulation occurs (verification of residual voltage U0); the protection sends a
TRIP command if voltage U0 exceeds threshold U22 for longer than t2.
RV
The protection is always available in the 4P configuration; if presence of neutral voltage is activated in Ekip
Measuring module (page 128). protection is also available for 3P and 3P + N configurations.
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 90)
V
Parameters
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold U22 The value is given as both absolute value (Volts) and relative value (Un)
and can be set within the range: 0.05 Un to 0.5 Un in 0.001 Un steps
This is the trip time of the protection; the value is given in seconds and
Time t22
can be set within a range: 0.05 s to 120 s, in 0.01 s steps
This is the time the alarm is retained after the protection has quit the
alarm condition; it can be useful for keeping the timing activated when
Reset Time the protection is temporarily deactivated.
The value is given in seconds and can be set within the range: 0 s to
0.2 s, in 0.02 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 75).
ABB | SACE Tmax XT
Default
OFF
OFF
0,15 Un
15 s
0 s
Protections | 3 - Voltage Advanced protections