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1MRK 505 293-UEN B
7.3.9.2
Checking the residual (earth fault) current operate value
IP>
Check the low set
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
4.
Disconnect AC and START input signals.
7.3.9.3
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
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
3.
Disconnect AC and START input signals.
7.3.9.4
Verifying the re-trip mode
Choose the mode below, which corresponds to the actual case.
In the cases below it is assumed that
Settings/IED Settings/Current/CCRBRF(50BF)/CCRBRF:1.
Checking the case without re-trip,
1.
Set
2.
Apply the fault condition, including start of CCRBRF, well above the set current value.
3.
Verify that no re-trip, but back-up trip is achieved after set time.
4.
Disconnect AC and START input signals.
Checking the re-trip with current check,
1.
Set
2.
Apply the fault condition, including start of CCRBRF, well above the set current value.
3.
Verify that re-trip is achieved after set time
4.
Apply the fault condition, including start of CCRBRF, with current below set current value.
5.
Verify that no re-trip, and no back-up trip is obtained.
6.
Disconnect AC and START input signals.
Checking re-trip without current check,
Breaker protection REQ650
Commissioning manual
NoI>check or Retrip off is set, only back-up trip can be used to
Note! If
IP> .
check set
IN> current where setting FunctionMode = Current and setting BuTripMode
t1 and back-up trip times t2 .
RetripMode = Retrip Off .
RetripMode = CB Pos Check .
© Copyright 2013 ABB. All rights reserved
IN> .
FunctionMode = Current and setting
FunctionMode = Current as set under Main menu/
RetripMode = Retrip Off
RetripMode = CB Pos Check
t1 and back-up trip after time t2
RetripMode = No CBPos Check
Section 7
Testing functionality
IN> set below
M12104-80 v7
M12104-93 v6
M12104-36 v6
M12104-107 v4
M12104-48 v4
M12104-58 v6
55
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