Basler Electric BE1-700 - Manual (Page 421)

Relay Equation
When the 46 function is used, the relay uses the K factor (i.e., 46 time dial setting), 46 minimum pickup
setting and generator full-load current to create a constant Z (see Equation A-4).
2
Setting Nom
Setting Pickup 46
I
Dial Time 46 Z








=
Equation A-4
The time to trip equation used in the relay is:
seconds 0.028
M
Z
T
2
T
+ =
Equation A-5
where
Setting Pickup 46
I Measured
M
2 =
Equation A-6
which, when M > 1, reduces to:
2
2
Setting Nom
T
Measured I
I
Dial Time 46 T 







=
Equation A-7
9376700990 Rev M BE1-700 Time Overcurrent Characteristic Curves A-5