ABB REG670 - Verifying Instantaneous Back-Up Trip at CB Faulty Condition; Verifying the Function Mode Current;Contact

13.5.8.6 Verifying instantaneous back-up trip at CB faulty condition
M12104-197 v7
Applies in a case where a signal from CB supervision function regarding CB being
faulty and unable to trip is connected to input 52FAIL.
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 tCBAlarm. Keep the input activated.
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.
13.5.8.7 Verifying the function mode
Current/Contact
M12104-237 v6
To be made only when FunctionMode = Current/Contact is selected. It is suggested to
make the 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 Pickup_PH
M12104-241 v7
The operation shall be as in FunctionMode = Current.
1. Set FunctionMode = Current/Contact.
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
Pickup_BlkCont
M12104-281 v10
It simulates 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, setting RetripMode = No CBPos Check.
1. Set FunctionMode = Current/Contact.
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 Pickup_BlkCont
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).
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 205
Commissioning manual