ABB RELION 611 Series Technical Manual page 453

1MRS757454 D
611 series
Technical Manual
The operate times for the ANSI and IEC IDMT curves are defined with the
coefficients A, B and C.
The values of the coefficients can be calculated according to the formula:
 
 
A
 
t s [ ] = B k
+ ⋅
c
 
I
 
1
 
 −

 
I
>
 
 
A060821 V2 EN
t[s] Operate time in seconds
I measured current
Start value
I> set
Time multiplier
k set
Table 476: Curve parameters for ANSI and IEC IDMT curves
Curve name
(1) ANSI Extremely
Inverse
(2) ANSI Very Inverse
(3) ANSI Normal
Inverse
(4) ANSI Moderately
Inverse
(6) Long Time
Extremely Inverse
(7) Long Time Very
Inverse
(8) Long Time Inverse
(9) IEC Normal Inverse
(10) IEC Very Inverse
(11) IEC Inverse
(12) IEC Extremely
Inverse
(13) IEC Short Time
Inverse
(14) IEC Long Time
Inverse
General function block features
A B
28.2 0.1217
19.61 0.491
0.0086 0.0185
0.0515 0.1140
64.07 0.250
28.55 0.712
0.086 0.185
0.14 0.0
13.5 0.0
0.14 0.0
80.0 0.0
0.05 0.0
120 0.0
Section 9
(Equation 40)
C
2.0
2.0
0.02
0.02
2.0
2.0
0.02
0.02
1.0
0.02
2.0
0.04
1.0
447