ABB REF 610 - Page 43

43
The time/current curve groups based on the IEC standard are illustrated in
Fig. 5.1.4.9.-1...Fig. 5.1.4.9.-4.
If the ratio between the current and the set start value is higher than 20,
the operate time is the same as when the ratio is 20.
Feeder Protection Relay
Technical Reference Manual
REF 610REF 610
1MRS755310