Switchgroups And Parameter Masks; Example Of Calculating The Checksum Of A Sg_ Selector Switchgroup - ABB REF610 Technical Reference Manual

REF610 REF610
60
Feeder Protection Relay
Technical Reference Manual - ANSI Version

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
Fig. 5.1.4.10.-1 shows an example of manual checksum calculation.
Switch Position
number
1 1
2 0
3 1
4 0
1
5
0
6
1
7
8 0
9 1
0
10
11 1
12
0
13
1
14
0
15
1
16
0
17 1
18 0
1
19
20 0
21 1
22 0
1
23
checksum
Fig. 5.1.4.10.-1

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 are properly set.
The factory default settings of the switches and the corresponding checksums are
presented in the following tables.
SGF1...SGF5
Switchgroups SGF1...SGF5 are used for configuring the wanted function as
follows:
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
4096
x
=
x
8192 =
=
x 16384
x =
32768
x
=
65536
x
131072 =
x 262144
=
x =
524288
x =
1048576
x =
2097152
x =
4194304
=
S
SG_
1MRS755535
Value
1
0
4
0
16
0
64
0
256
0
1024
0
4096
0
4096
0
16384
0
65536
0
262144
0
1048576
0
4194304
5505024
A051892