Table of Contents
Advertisement
ABB Switzerland Ltd
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
1
current
2
current
3
current
4
voltage
Total
Table 3.4
Example for calculating the computation require-
ment
3-8
REG 316*4 1MRB520049-Uen / Rev. F
Input
Settings
channel
Phases
Pick-up
10.0 I N
1 (,2,3)
three
1 (,2,3)
three
2.5 I N
3.5 I N
4
single
7
single
2.0 U N
Percentage
Time
incl. factor
30 ms
3 % x 4 = 12 %
100 ms
1 % x 2 = 2 %
300 ms
2 % x 1 = 2 %
50 ms
2 % x 2 = 4 %
20 %
Advertisement
Chapters
Table of Contents
