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A.6 OSCILLOGRAPHY
The second block of information contains the oscillo report; this includes the RMS values of analog signals when the
oscillography was triggered. If the trigger is produced by a relay trip, these values will be the fault values.
This block will be written as follows:
VALUES AT THE MOMENT OF THE OSCILLOGRAPHY TRIGGER
MIB RELAY
MEMORY
BIT
POSITION
A
The third and last block, that contains the rest of information for creating COMTRADE format files, has the following
structure:
OSCILLOGRAPHY GENERAL DATA
MEMORY POSITON
16F6
16FC
16FE
1700
1702
Once the oscillography information has been read and saved, we will close this screen in the relay. For this purpose, we
send the oscillography file closing command. The information will continue to be stored in the relay, as the closing of this
window does not involve a deletion of the information. However, only one oscillography window will be stored, and when
a new one is created, the previous one will be deleted.
ADDRESS
FUNCTION
01
10
Reply from the relay:
A-20
DESCRIPTION
Idiff_a when the oscillography was triggered
Idiff_b when the oscillography was triggered
Idiff_c when the oscillography was triggered
BIT
DESCRIPTION
Date and time
Number of samples per second
Number of samples
Line frequency
Oscillo index
START
#REGS
00 00
00 03
ADDRESS
FUNCTION
01
10
MIB High Impedance Bus Differntial Relay
LENGTH (BYTES)
4
4
4
LENGTH
6
2
2
2
2
#BYTES
COMMAND
06
12 00
START
#REGS
00 00
00 03
APPENDIX A
FORMAT
F2
F2
F2
FORMAT
F1
F5
F5
F5
F5
PASSWORD
CRC
01 00 00 00
E4 0E
CRC
80 08
GEK-106426B
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