6.5.5.1
Checking the phase current operate value,
IP>
Check the current level
IP>
where setting
FunctionMode
=
Current
and setting
BuTripMode
=
1 out of 3
or
2 out of 4
as set under
Main menu/Settings/IED Settings/
Current/CCRBRF(50BF)/CCRBRF:1
.
1.
Apply the fault condition, including START of CCRBRF, with a current below
set
IP>
.
2.
Repeat the fault condition and increase the current in steps until a trip occurs.
3.
Compare the result with the set
IP>
.
4.
Disconnect AC and START input signals.
Note! If
NoI>check
or
Retrip off
is set, only back-up trip can be
used to check set
IP>
.
6.5.5.2
Checking the residual (earth fault) current operate value
IN> set below
IP>
Check the low set
IN>
current where setting
FunctionMode
=
Current
and setting
BuTripMode
=
1 out of 4
as set under
Main menu/Settings/IED Settings/Current/
CCRBRF(50BF)/CCRBRF:1
.
1.
Apply the fault condition, including START of CCRBRF, with a current just
below set
IN>Pickup_N
.
2.
Repeat the fault condition and increase the current in steps until trip appears.
3.
Compare the result with the set
IN>
.
4.
Disconnect AC and START input signals.
6.5.5.3
Checking the re-trip and back-up times
The check of the set times can be made in connection with the check of operate values
above.
Choose the applicable function and trip mode, such as
FunctionMode
=
Current
and
setting
RetripMode
=
No
CBPos. Check as set under
Main menu/Settings/IED
Settings/Current/CCRBRF(50BF)/CCRBRF:1
.
1.
Apply the fault condition, including start of CCRBRF, well above the set current
value. Measure time from START of CCRBRF.
2.
Check the re-trip
t1
and back-up trip times
t2
.
3.
Disconnect AC and START input signals.
1MRK 502 049-UEN A
Section 6
Testing functionality
69
Commissioning manual
