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ABB Substation Automation
Products and Systems
1MRS750940-MUM
Technical Reference Manual
SGR1...SGR4
The start and operate signals of the protection stages are connected to the output
contacts with switches SGR1...SGR4.
The matrix below can be used for help in making the desired selections. The start and
operate signals of the different protection stages are combined with the output
contacts by encircling the desired intersection point. Each intersection point is marked
with a switch number, and the corresponding weighting factor of the switch is shown
on the bottom row of the matrix. The switchgroup checksum is obtained by adding
horizontally the weighting factors of all the selected switches of the switchgroup.
PO1
SGR1
I>
1
SGR2
1
t>
SGR3
I>>
1
SGR4
t>>
1
Weighting factor
1
Figure 4.1.3.3-2 Output signal matrix of the overcurrent relay
Table 4.1.3.3-6 SGR1...SGR4
Switch
Function
SGR1/1...4
I> signal to output contacts PO1, PO2, SO1 and SO2
SGR2/1...4
t> signal to output contacts PO1, PO2, SO1 and SO2
SGR3/1...4
I>> signal to output contacts PO1, PO2, SO1 and SO2
SGR4/1...4
t>> signal to output contacts PO1, PO2, SO1 and SO2
PO2
SO1
SO2
Not in use
2
3
4
2
3
4
2
3
4
2
3
4
2
4
8
Not in use
Not in use
Not in use
5
6
7
5
6
7
5
6
7
5
6
7
16
32
64
128
REJ 523
Checksum
(factory setting)
∑ SGR1=
8
(∑ = 12)
∑ SGR2=
8
(∑ = 3)
∑ SGR3=
8
(∑ = 12)
∑ SGR4=
8
(∑ = 3)
Default
setting
12
3
12
3
29
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