At mode
2 out of 4
the phase current setting,
IP>
can be checked by single-phase
injection where the return current is connected to the summated current input. The
value of residual (earth fault) current IN set lower than
IP>
is easiest checked in back-
up trip mode
1 out of 4
.
6.3.7.1
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)/1:CCRBRF
.
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>
.
6.3.7.2
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)/1:CCRBRF
.
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.
6.3.7.3
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)/1:CCRBRF
.
Section 6
1MRK 511 248-UEN -
Testing functionality
50
Commissioning Manual
