Page 89 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
RC Protection Function
Rc protection protects against the residual current earth faults by detecting the fault current with the
t appropriate external Rc toroid.
Idn Rc The protection sends a TRIP command if the current from toroid Rc exceeds threshold Idn for longer than
Tdn.
tdn 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 92)
I • the graph with trip curve (page 100)
Parameters
Parameter Description Default
Defines the value that activates the protection; the value is given in
Threshold Idn 5 A
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 0,06 s
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 enabler with voltage socket 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

87 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Touch - Protections | 9 - Additional protections and functions