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Remote
In addition to the event codes, the SPA bus
transfer data
allows the substation level control data
communicator to read all the input data
( I-data), the setting values (S values), the
values recorded in the memory (V-data), and
some other data of the individual phase
12
B
Data
Input data
Load current measured on the HV
side and corrected by the CT
transforming ratio I
/I
1
n
Measured differential current
Load current measured on the LV
side and corrected by the CT
transforming ratio I
/I
2
n
Measured 2nd harmonic component
Harmonics blocking signal from
the other phase modules
Output data
Harmonics blocking
Tripping
Settings
Current basic starting value
setting p
Current setting of starting
ratio s
Actual blocking threshold I
setting
Actual setting of stage I>>
(This setting is automatically
halved should the bias current
fall below 33 % of the differen-
tial current)
Actual checksum of switchgroup
SG1 (Vector group matching,
SG1/1...6, output relay latching,
SG1/7, and blocking mode, SG1/8,
selection)
modules of the differential relay. Further, part
of the information can be altered by commands
given over the SPA bus. All data are available
on channel 0, which needs not to be written in
data communication instructions .
Code
Data
direction
I1
R
I2
R
I3
R
I4
R
I5
R
O1
R
O2
R
S1
R
S2
R
>
S3
R
hr
S4
R
S5
R
Values
0...50 x I
n
0...50 x I
n
0...50 x I
n
0...33 x I
n
0 = no blocking
1 = blocking input active
0 = no blocking
1 = blocking control alert
0 = no tripping
1 = tripping control active
20...50 % I
n
10...50 %
10...20 % I
d
20...30 x I
n
(10...15 x I
)
n
0...255
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