ABB REG316 4 Series - Page 46

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. F
3-8
Example:
Table 3.4 shows the computation requirement according to
Table 3.3 of a simple protection scheme with four active func-
tions. Since functions 1 and 2 use the same analogue inputs, the
amount of computing capacity required for function 2 is reduced
to that of a second stage.
Function
No. Type
Input
channel Phases
Settings
Pick-up Time
Percentage
incl. factor
1 current 1 (,2,3) three
10.0 I
N
30 ms 3 % x 4 = 12 %
2 current 1 (,2,3) three
2.5 I
N
100 ms 1 % x 2 = 2 %
3 current 4 single
3.5 I
N
300 ms 2 % x 1 = 2 %
4 voltage 7 single
2.0 U
N
50 ms 2 % x 2 = 4 %
Total 20 %
Table 3.4 Example for calculating the computation require-
ment