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REF 610
48
Feeder Protection Relay
Technical Reference Manual
Switchgroups and parameter masks
The settings can be altered and the functions of the relay selected in the SG_ selector
switchgroups. The switchgroups are software based and thus not physical switches
to be found in the hardware of the relay.
A checksum is used for verifying that the switches have been properly set. The
figure below shows an example of manual checksum calculation.
Switch
Position
number
1
1
2
0
3
1
4
0
5
1
6
0
7
1
8
0
9
1
10
0
11
1
12
0
13
1
14
0
15
1
16
0
17
1
18
0
19
1
20
0
21
1
22
0
23
1
checksum
Fig. 4.1.4.10.-1 An example of calculating the checksum of a SG_ selector
switchgroup
When the checksum, calculated according to the example above, equals the
checksum of the switchgroup, the switches in the switchgroup have been properly
set.
The factory default settings of the switches and the corresponding checksums are
presented in the tables below.
Weighting
factor
x
1
=
x
2
=
x
4
=
x
8
=
x
16
=
x
32
=
x
64
=
x
128
=
x
256
=
x
512
=
x
1024
=
x
2048
=
x
4096
=
x
8192
=
x
16384
=
x
32768
=
x
65536
=
x
131072
=
x
262144
=
x
524288
=
x
1048576
=
x
2097152
=
x
4194304
=
SG_ ∑
=
1MRS 755310
Value
1
0
4
0
16
0
64
0
256
0
1024
0
4096
0
16384
0
65536
0
262144
0
1048576
0
4194304
5505024
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