Verifying The Function Mode Current&Contact - ABB RET670 Installation And Commissioning Manual

Section 13
Verifying settings by secondary injection
13.6.7.8
150
1. Set FunctionMode = Contact
2. Apply input signal for CB closed to relevant input or inputs CBCLDL1 (2 or 3)
3. Apply input signal, or signals for start of CCRBRF. The value of current
could be low.
4. Verify that re-trip and back-up trip are achieved after set times.
5. Disconnect the start signal(s). Keep the CB closed signal(s).
6. Apply input signal(s), for start of CCRBRF. The value of current could be low.
7. Arrange disconnection of CB closed signal(s) well before set back-up trip
time t2.
8. Verify that back-up trip is not achieved.
9. Disconnect injected AC and START input signals.
Verifying the function mode
To be made only when FunctionMode = Current&Contact is selected. It is
suggested to make the tests in one phase only, or at three-phase trip applications for
just three-phase tripping.
Checking the case with fault current above set value
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 start of CCRBRF, with current above the
set IP> value.
4. Check that the re-trip, if selected, and back-up trip commands are achieved.
5. Disconnect injected AC and START 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, setting RetripMode = No CBPos Check.
1. Set FunctionMode = Current&Contact.
2. Apply input signal for CB closed to relevant input or inputs CBCLDL1 (2 or 3)
3. Apply the fault condition with input signal(s) for start of CCRBRF. The value
of current should be below the set value I>BlkCont
4. Verify that 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 START signal(s). Keep the CB closed signal(s).
6. Apply the fault and the start again. The value of current should be below the
set value I>BlkCont.
7. Arrange disconnection of BC closed signal(s) well before set back-up trip
time t2. It simulates a correct CB tripping.
8. Verify that back-up trip is not achieved. Re-trip can appear for example, due
to selection "Re-trip without current check".
9. Disconnect injected AC and START input signals.
Current&Contact
Installation and commissioning manual
1MRK 504 088-UEN C
IP>
I>BlkCont