
Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
The Breaker failure protection function CCRBRF should normally be tested in
conjunction with some other function that provides a start signal. An external
START signal can also be used.
To verify the settings in the most common back-up trip mode
1 out of 3
, it is
sufficient to test phase-to-earth faults.
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
.
6.4.6.1
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>
.
6.4.6.2
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.
Section 6
1MRK 504 126-UEN -
Testing functionality
50
Commissioning Manual
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