ABB Relion 670 Series Applications Manual page 555

1MRK 511 401-UEN Rev. K
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Figure 266: Configuration of current inputs using SMAIs in a 1 1/2 circuit breaker
Procedure to bring protections back into service and enable maintenance
of a faulty merging unit
1. Disconnect bay
2. Energize binary input, block of bay. Protections are now back in service.
3. Maintenance of the merging unit can start.
Procedure to bring bay back into service after maintenance of a merging
unit
1. Energize merging unit.
2. De-energize binary input block of bay. Protections are now back in service.
3. Reconnect bay.
21.3.3 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
21.3.4 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).
Bay control REC670
Application manual
SMAI function blocks exist in different cycle times, and all the SMAI blocks that
receive SV streams from the merging units must have the block input signal
configured in the same way to get the correct behavior.
application.
Faulty merging unit for bay in
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Section 21
Station communication
549