Checking The Phase Current Operate Value, Ip; Checking The Residual (Earth Fault) Current Operate Value; In> Set Below Ip - ABB ret650 Commissioning Manual

Section 6
Testing functionality
6.4.6.1
6.4.6.2
50
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.
Checking the phase current operate value,
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>.

Checking the residual (earth fault) current operate value

IP>
below
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.
1MRK 504 126-UEN -
IP>
IN> set
Commissioning Manual