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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
0
) will be above set value
Pickup_N
.
5.
Verify that back-up trip is not achieved.
6.
Disconnect AC and INITIATE input signals.
6.3.9.6
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 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.
6.3.9.7
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
Pickup_PH
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.
1MRK 505 293-UUS A
Section 6
Testing functionality
63
Commissioning manual