ABB RET620 - Page 6

Table 1. Supported functions, continued
Functionality CTs & VTs
Three-phase thermal overload protection for power transformers, two time constants
●
1)
Loss of phase (undercurrent), instance 1
●
1)
Loss of phase (undercurrent), instance 2
●
2)
Stabilized and instantaneous differential protection for 2-winding transformers ●
Numerical stabilized low impedance restricted earth-fault protection, instance 1
●
1)
Numerical stabilized low impedance restricted earth-fault protection, instance 2
●
2)
High impedance based restricted earth-fault protection, instance 1
●
1)
High impedance based restricted earth-fault protection, instance 2
●
2)
Circuit breaker failure protection, instance 1
●
1)
Circuit breaker failure protection, instance 2
●
2)
Three-phase inrush detector
●
1)
Master trip, instance 1 ●
Master trip, instance 2 ●
Arc protection, instance 1
○
5)
Arc protection, instance 2
○
5)
Arc protection, instance 3
○
5)
Multipurpose analog protection, instance 1 ●
Multipurpose analog protection, instance 2 ●
Multipurpose analog protection, instance 3 ●
Multipurpose analog protection, instance 4 ●
Multipurpose analog protection, instance 5 ●
Multipurpose analog protection, instance 6 ●
Multipurpose analog protection, instance 7 ●
Multipurpose analog protection, instance 8 ●
Multipurpose analog protection, instance 9 ●
Multipurpose analog protection, instance 10 ●
Multipurpose analog protection, instance 11 ●
Multipurpose analog protection, instance 12 ●
Control
Circuit-breaker control, instance 1
●
1)
Circuit-breaker control, instance 2
●
2)
Disconnector control, instance 1
●
1)
Disconnector control, instance 2
●
1)
Earthing switch control, instance 1
●
1)
Disconnector control, instance 3
●
2)
Disconnector control, instance 4
●
2)
Earthing switch control, instance 2
●
2)
Transformer Protection and Control 1MRS757846 A
RET620
Product version: 2.0
6 ABB