Checking The Binary Output Signals; Checking Protection Stability; Checking Through-Fault Stability With De-Energized Busbars - ABB RELION REB500 Commissioning Manual

1MRK 505 401-UEN B
Alternatively the circuit-breaker CLOSE command can be temporarily configured as an event
and its operation observed in the HMI500 event list.
3.2.7

Checking the binary output signals

All binary inputs are tested by setting them appropriately in the test mode. Select Test mode
from the Testing menu and click on Unblock all relays in the test mode dialog.
In the test mode, select
binary module. The status of an output can be changed by doubleclicking on the
corresponding field, which then changes to yellow.
Check that the correct circuit-breaker tripping coil is tripped by the correspondingly
configured tripping output. Repeat the procedure for the separate alarm contacts.
3.2.8

Checking protection stability

The stability check verifies that all CTs are connected with the correct polarity and have the
correct ratio. All feeder and bus-tie breaker CTs must be connected, otherwise the correct
operation of the protection cannot be guaranteed.
Wherever possible the stability should be checked before the busbar is energized, because the
risk of a busbar fault is especially high when it is being energized for the first time (flashovers,
grounding isolators still closed etc.).
3.2.8.1

Checking through-fault stability with de-energized busbars

Inject a current from a primary injection test set (25 % of the CT rated current is
recommended) into two feeders (a reference feeder and one other feeder). Any feeder can be
used as reference. Compare each of the other feeders and bus-tie breaker with the reference
feeder.
Distributed busbar protection REB500
Commissioning manual
Test operations of circuit-breakers and isolators require the permission of the
user and all the prescribed safety precautions must be observed. Avoid
unnecessary switching operations.
Binary input/output statu s in the View menu to view the outputs of a
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Section 3
Commissioning
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