ABB RELION REX640 Technical Manual page 600

Protection functions
Figure 341: Example of definite time operation of IFPTOC, when Operation principle
= "EF current based", Operating curve type = "Definite time". Settings EF current Str
Val = 0.04*In (4A) and DT stage Op time = 400ms. Reduction factor = 1.0. Maximum
earthing Ris = 10ohm.
When
• Operate time is inverse time according to standard EN50522:
600
Operating curve type = "Inverse time EN50522" is selected, then
1MRS759142 F
REX640
Technical Manual