
•
Bit TP: the protection equipment has tripped during the fault
•
Bit TM: the disturbance data are currently being transmitted
•
Bit TEST: the disturbance data have been recorded during normal operation or test
mode.
•
Bit OTEV: the disturbance data recording has been initiated by another event than
pick-up
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.
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
M11874-482 v3
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
Table continues on next page
1MRK 511 408-UUS A
Section 19
Station communication
Phasor measurement unit RES670 2.2 ANSI
717
Technical manual
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