14
Switchgroups
SGB1…3
The functions of the control signals BS1, BS2
and RRES (BS3) are defined with switchgroups
SGB1…3. The matrix shown below can be used
as an aid for making the desired selections. The
control signals at the left side in the matrix can
be combined with the functions at the upper
side by encircling the desired intersection points.
Each intersection point is marked with a switch
number and the corresponding weight factor of
the switch is shown at the bottom row of the
matrix. By horizontally adding the weight fac-
tors of all the selected switches of a switchgroup
the switchgroup checksums is obtained.
Note!
Check if all the control signals of the relay
module SPCJ 4D28/E351 are available in the
protection relay in question.
t>>
t >
0
t >>
0
Main
Second
BS1
BS2
RRES
(BS3)
Indicators
Indicators,
self-hold.,
registers
Indicators,
self-hold.
∑
SGB1=
∑
SGB2=
∑
SGB3=
t>
∆
I>
2
4
8
16
32
64
Weighting
factor
1
128
32
2
3
4
5
7
1
8
6
2
3
4
5
6
7
1
8
2
3
4
5
6
7
1
8
(
∑
= 0)
(
∑
= 0)
(
∑
= 0)
Checksum
(factory setting)
Fig. 5. Control signal matrix of the combined overcurrent and earth-fault relay module
SPCJ 4D28/E351.
Switch
Function
SGB_/1...4
Configuration of blocking signals to be applied to one or more protection stages
via the external control signals BS1, BS2 and RRES (BS3). When a switch is in
position 1, the operation of the concerned protection stage is blocked as long as
the control signal is high.
SGB_/5
Switching between main setting values and second settings, either via the serial
bus using command V 150, or using an external control signal.
When SGB_/5 = 0, the setting values cannot be switched with an external control
signal.
When SGB1/5 = 1, the currently used setting values are determined exclusively
by the state of the external control signal.
Note!
When the relay is provided with second settings in addition to the main settings,
it is important that switch SGB_/5 has the same setting in the main settings and
the second settings.
SGB1/6
Blocking of stage
∆
I> via the external control signal BS1. The principle of
operation is the same as for switches SGB_/1…4.
SGB2…3/6
Resetting of the operation indicators on the front panel, see section "Resetting"
SGB_/7
Resetting of the operation indicators and the latched output relays, see section
"Resetting"
SGB_/8
Resetting of the operation indicators, the latched output relays and the registers,
see section "Resetting"
Summary of Contents for SPAA 341 C /E351
Page 130: ......
