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.
7.5.5.7
Verifying the function mode
Current&Contact
M12104-237 v4
To be made only when
FunctionMode = Current&Contact is selected.
Checking the case with fault current above set value
IP>
M12104-241 v4
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
M12104-281 v6
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.
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.
7.5.5.8
Completing the test
M12104-72 v5
Continue to test another function or end the testing by setting the parameter
TestMode to Off
under Main menu/Tests/IED test mode/1:TESTMODE. If another function is tested, then set
the parameter
Blocked to No under Main menu/Tests/Function test modes/Current/
CCRBRF(50BF)/X:CCRBRF for the function, or for each individual function in a chain, to be
tested next. Remember to set the parameter
Blocked to Yes, for each individual function that
has been tested.
1MRK 502 035-UEN A
Section 7
Testing functionality
Generator protection REG650
59
Commissioning manual
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