Schweitzer Engineering Laboratories SEL-2020 - Page 348

E-4 Appendix E Date Code 20010518
SEL-2020 Instruction Manual
Table E.3: Archive Memory Usage Estimation
Archive 1 Archive 2 Archive 3
Port
No. Of
Records
Record
Size
No. Of
Blocks
No. Of
Records
Record
Size
No. Of
Blocks
No. Of
Records
Record
Size
No. Of
Blocks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Total A1 Blocks Total A2 Blocks Total A3 Blocks
A1 Blocks + A2 Blocks + A3 Blocks =
(Max. available: 8192 blocks)
For example, consider the case where you want to collect demand meter data from an SEL-151
Relay every 15 minutes and want the SEL-2020 to store up to 10 days worth of this data. This
yields a total desired number of records of 960. From Table E.1, the memory requirement for
151 demand meter data is
1
3
2n+ . Thus, the total number of blocks is
1
3
960 2 322()+= .