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.
FAN 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.
Interoperability, physical layer
Supported
Electrical Interface
EIA RS-485 Yes
number of loads 32
Optical interface
glass fibre Yes
plastic fibre
Transmission speed
9600 bit/s Yes
19200 bit/s Yes
Link Layer
DFC-bit used Yes
Connectors
connector F-SMA No
connector BFOC/2.5 Yes
Interoperability, application layer
Supported
Selection of standard ASDUs in monitoring direction
ASDU Yes
1 Time-tagged message Yes
2 Time-tagged message with rel. time Yes
3 Measurands I Yes
4 Time-tagged message with rel. time Yes
5 Identification Yes
6 Time synchronization Yes
8 End of general interrogation Yes
9 Measurands II Yes
Table continues on next page
1MRK502052-UEN B Section 18
Station communication
1059
Technical manual
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