ABB RED615 Technical Manual page 836

Section 11
General function block features
830
k A ⋅
 
t s
=
   
U U − >

B × − C

U >

GUID-6E9DC0FE-7457-4317-9480-8CCC6D63AB35 V2 EN
t [s] operate time in seconds
U measured voltage
Start value
U> the set value of
Time multiplier
k the set value of
Table 661: Curve coefficients for the standard overvoltage IDMT curves
Curve name A
(17) Inverse Curve A 1
(18) Inverse Curve B 480
(19) Inverse Curve C 480
+ D
E



B C
1 0
32 0.5
32 0.5
1YHT530004D05 D
(Equation 105)
D E
0 1
0.035 2
0.035 3
615 series
Technical Manual