ABB Relion 670 Series Technical Reference Manual page 593

1MRK 505 208-UEN B
Technical reference manual
Information sent in the disturbance upload is specified by the standard; however,
some of the information are adapted to information available in disturbance
recorder in 670 series.
This section describes all data that is not exactly as specified in the standard.
ASDU23
In 'list of recorded disturbances' (ASDU23) an information element named SOF
(status of fault) exists. This information element consists of 4 bits and indicates
whether:
• 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 start
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. In 670 series FAN is equal to disturbance number, which is incremented for
each disturbance.
ASDU26
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 in 670 series, just as FAN, equal to disturbance number.
To get INF and FUN for the recorded binary signals there are parameters on the
disturbance recorder for each input. The user must set these parameters to whatever
he connects to the corresponding input.
Section 15
Station communication
587