ABB Relion 670 series, Technical Manual

Page: 1195 / 1432

successfully transferred disturbance (acknowledged by the master) will not be reported to the
master again.
When a new disturbance is recorded by the IED a list of available recorded disturbances will be
sent to the master, an updated list of available disturbances can be sent whenever something has
happened to disturbances in this list. For example, when a disturbance is deleted (by other client,
for example, SPA) or when a new disturbance has been recorded or when the master has uploaded
a disturbance.
Deviations from the standard
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 the IED 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 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.
M11874-482 v2
Interoperability, physical layer
Supported
Electrical Interface
EIA RS-485 No
number of loads No
Table continues on next page
1MRK 502 066-UUS B Section 18
Station communication
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Technical manual