ABB SACE Tmax XT7 Operation And Maintenance Manual page 84

RC Protection
t
Idn
82 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Function
Rc protection protects against the residual current earth faults by detecting the fault current with the
appropriate external Rc toroid.
Rc
The protection sends a TRIP command if the current from toroid Rc exceeds threshold Idn for longer than
Tdn.
To check and simulate the trip times in relation to all the parameters, please consult:
tdn
• summary table of the protections with the operating characteristics (page 87)
• the graph with trip curve (page 97)
I
Parameters
Parameter Description
Defines the value that activates the protection; the value is given in
Threshold Idn
Amperes and can be set within a range of values from 3 A to 30 A
This is the trip time of the protection; the value is given in seconds and
Time Tdn
can be set within a range of values from 0.05 s to 0.8 s
Limitations and additional functions
Ekip Touch activates and displays the Rc protection parameters if the following conditions are observed:
• Rating Plug Rc model assembled and installed
• Measurement module assembled and installed
protection activation includes checking for the presence of toroid Rc and signaling on the diagnosis bar in
the event of alarm/absence
ABB | SACE Tmax XT
Default
5 A
0,06 s
Protections | 15 - Additional protections and functions