Page 59 - MCCB-XT5

ABB | SACE Tmax XT

RV Protection Function
The protection trips if loss of insulation occurs (verification of residual voltage U0); the protection sends
t a TRIP command if voltage U0 exceeds threshold U22 for longer than t2.
U22 RV The protection is always available in the 4P configuration; if presence of neutral voltage is activated in
Measurement module (page 128). protection is also available for 3P and 3P + N configurations.
t22 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 82)
V • the graph with trip curve (page 93)
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
Trip Enable disabled, the alarm and exceedance of protection time are only OFF
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (V) and relative value
Threshold U22 0,15 Un
(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
Time t22 seconds and can be set within a range: 0.05 s to 120 s, in 0.01 s 15 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
Reset Time activated when the protection is temporarily deactivated. 0 s
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 76).

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