ABB RET670 Commissioning Manual page 159

1MRK 504 154-UUS B
1. Repeat the check of back-up trip time. Disconnect current and input signals.
2. Activate the input 52FAIL. The output CBALARM (CB faulty alarm) should appear after set
time
3. Apply the fault condition, including initiation of CCRBRF (50BF), with current above set
current value.
4. Verify that back-up trip is obtained without intentional delay, for example within 20ms from
application of initiation.
5. Disconnect injected AC and BFI_3P input signals.
10.5.9.7 Verifying the case
It is assumed that re-trip without current check is selected,
1. Set
2. Apply input signal for CB closed to relevant input or inputs 52a_A (B or C).
3. Apply input signal, or signals for initiation of CCRBRF (50BF).
4. Verify that phase selection re-trip and back-up trip are achieved after set times.
5. Disconnect the trip signal(s). Keep the CB closed signal(s).
6.
7. Apply input signal(s), for initiation of CCRBRF (50BF).
8. Arrange disconnection of CB closed signal(s) well before set back-up trip time
9. Verify that back-up trip is not achieved.
10. Disconnect injected AC and BFI_3P input signals.
10.5.9.8 Verifying the function mode
To be made only when
tests in one phase only, or at three-pole trip applications for just three-pole tripping.
Checking the case with fault current above set value
The operation shall be as in
1. Set
2. Leave the inputs for CB close inactivated. These signals should not influence.
3. Apply the fault condition, including initiation of CCRBRF (50BF), with current above the set
Pickup_PH value.
4. Check that the re-trip, if selected, and back-up trip commands are achieved.
5. Disconnect injected AC and BFI_3P input signals.
Checking the case with fault current below set value
The case shall simulate a case where the fault current is very low and operation will depend on CB
position signal from CB auxiliary contact. It is suggested that re-trip without current check is used,
RetripMode = No CBPos Check .
setting
1. Set
2. Apply input signal for CB closed to relevant input or inputs 52a_A (B or C)
3. Apply the fault condition with input signal(s) for initiation of CCRBRF (50BF). The value of
current should be below the set value
4. Verify that phase selection re-trip (if selected) and back-up trip are achieved after set times.
Failure to trip is simulated by keeping the signal(s) CB closed activated.
5. Disconnect the AC and the BFI_3P signal(s). Keep the CB closed signal(s).
Commissioning manual
tCBAlarm . Keep the input activated.
RetripMode = Contact
FunctionMode = Contact
FunctionMode = Current&Contact is selected. It is suggested to make the
FunctionMode = Current .
FunctionMode = Current&Contact .
FunctionMode = Current&Contact .
RetripMode = Contact .
Current&Contact
Pickup_PH
Pickup_BlkCont
Pickup_BlkCont
Testing functionality by secondary injection
t2 .
Section 10
M12104-213 v9
M12104-237 v5
M12104-241 v6
M12104-281 v9
153