ABB Relion 670 Series Applications Manual page 438

Section 17
Station communication
17.3.3 Bay out of service for maintenance
When a bay need maintenance and has energized merging unit connected, it is always a risk to get
unplanned interruptions in the auxiliary power supply which may lead to unwanted blocking of
protections.
This can be resolved by using the same ACT configuration recommendations and procedures as
described in section
17.3.4 Setting guidelines
Merging Units (MUs) have several settings on local HMI under:
• Main menu /Configuration /Analog modules /MUx:92xx . The corresponding settings are also
available in PST (PCM600).
• Main menu /Configuration /Communication /Merging units configuration /MUx:92xx . The
corresponding settings are also available in ECT (PCM600).
XX can take value 01–12.
17.3.4.1 Specific settings related to the IEC/UCA 61850-9-2LE communication
The process bus communication IEC/UCA 61850-9-2LE has specific settings, similar to the analog inputs
modules.
If there are more than one sample group involved, time synch is mandatory. If there is no time
synchronization, the protection functions will be blocked due to condition blocking.
CTStarPointx: These parameters specify the direction to or from object. See also section
current channels".
SyncLostMode: If this parameter is set to Block and the IED hardware time synchronization is lost or the
synchronization to the MU time is lost, the protection functions in the list
conditional blocking. If this parameter is set to BlockOnLostUTC, the protection functions in list
blocked if the IED hardware time synchronization is lost or the synchronization of the MU time is lost or
the IED has lost global common synchronization (i.e. GPS, IRIG-B or PTP). SYNCH output will be set if
IED hardware time synchronization is lost. MUSYNCH output will be set if either of MU or IED hardware
time synchronization is lost.
Table 58:
Function description
Busbar differential protection, bus interconnection xx
Busbar differential protection, check zone
Busbar differential protection, dynamic zone selection
Busbar differential protection, single phase feeder xx
Table continues on next page
432
Faulty merging unit for bay in
Binary signals over LDCM are transmitted as valid and processed normally even when
analog signals are transmitted as invalid due to loss of communication or loss of time
synchronization.
Blocked protection functions if IEC/UCA 61850-9-2LE communication is interrupted and functions are connected
to specific MUs
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service.
"" will be blocked due to
IEC 61850 identification
BICPTRC_x, (1≤x≤5)
BCZPDIF
BDZSGAPC
BFPTRC_Fx, (1≤x≤24)
1MRK 505 370-UUS Rev. K
GUID-4E073C5A-F0E3-4FCA-A0D8-B6972C395A4A v1
GUID-29B296B3-6185-459F-B06F-8E7F0C6C9460 v4
SEMOD166590-24 v8
"Setting of
"" are
Busbar protection REB670
Application manual