ABB ret650, Руководство по вводу в эксплуатацию, Страница: 61 / 110

may be arranged by feeding three- (or two-) phase currents with equal phase
angle (I0-component) below
IP> , but of such value that the residual (earth
fault) current (3I
0
) will be above set value IN> .
5. Verify that back-up trip is not achieved.
6. Disconnect AC and START input signals.
6.4.6.6 Verifying the case
RetripMode = Contact
It is assumed that re-trip without current check is selected, RetripMode = Contact .
1. Set FunctionMode = Contact
2. Apply input signal for CB closed to input CBCLDL1 (2 or 3)CBCLD
3. Apply input signal, for start of CCRBRF. The value of current could be low.
4. Verify that phase-selection re-trip and back-up trip are achieved after set times.
5. Disconnect the start signal. Keep the CB closed signal.
6. Apply input signal, for start of CCRBRF. The value of current could be low.
7. Arrange disconnection of CB closed signal 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.
6.4.6.7 Verifying the function mode
Current&Contact
To be made only when FunctionMode = Current&Contact is selected.
Checking the case with fault current above set value
IP>
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
I>BlkCont
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 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.
1MRK 504 126-UEN -
Section 6
Testing functionality
53
Commissioning Manual