The only information that is easily available is test-mode status. The other
information is always set (hard coded) to:
TP Recorded fault with trip. [1]
TM Disturbance data waiting for transmission [0]
OTEV Disturbance data initiated by other events [1]
Another information element in ASDU23 is the FAN (fault number). According to
the standard this is a number that is incremented when a protection function takes
action. F
AN is equal to disturbance number
, which is incremented for each
disturbance.
ASDU26 / ASDU31
When a disturbance has been selected by the master by sending ASDU24, the
protection equipment answers by sending ASDU26, which contains an information
element named NOF (number of grid faults). This number must indicate fault
number in the power system,that is, a fault in the power system with several trip
and auto-reclosing has the same NOF (while the FAN must be incremented). NOF
is just as FAN, equal to disturbance number.
1MRK 511 394-UEN A Section 4
IEC 60870-5-103 vendor specific implementation
670 series 2.2 IEC 53
Communication protocol manual
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