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1MRK 506 331-UUS A
6.4.9.6
6.4.9.7
Commissioning Manual
1.
Set BuTripMode = 2 out of 4.
2.
Apply the fault condition, including initiation of CCRBRF (50BF), with one-
phase current above set Pickup_PH and residual (ground fault) above set
Pickup_N.
3.
Verify that back-up trip is achieved after set time. If selected, re-trip should also
appear.
4.
Apply the fault condition, including initiation of CCRBRF (50BF), with at least
one-phase current below set Pickup_PH and residual (ground fault) above set
Pickup_N. The current may be arranged by feeding three- (or two-) phase
currents with equal phase angle (I0-component) below Pickup_PH, but of such
value that the residual (ground fault) current (3I
Pickup_N.
5.
Verify that back-up trip is not achieved.
6.
Disconnect AC and INITIATE input signals.
RetripMode = Contact
Verifying the case
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 52a_A (B or C).
3.
Apply input signal, 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. Keep the CB closed signal.
6.
Apply input signal, for initiation of CCRBRF (50BF).
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 INITIATE input signals.
Verifying the function mode
To be made only when FunctionMode = Current&Contact is selected.
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 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 INITIATE input signals.
) will be above set value
0
Current&Contact
Section 6
Testing functionality
Pickup_PH
79
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