Note! If
NoI>check or Retrip off is set, only back-up trip can be used to
check set
IP>.
7.3.9.2
Checking the residual (earth fault) current operate value
IN> set below
IP>
M12104-80 v7
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.
7.3.9.3
Checking the re-trip and back-up times
M12104-93 v6
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.
7.3.9.4
Verifying the re-trip mode
M12104-36 v6
Choose the mode below, which corresponds to the actual case.
In the cases below it is assumed that
FunctionMode = Current as set under Main menu/
Settings/IED Settings/Current/CCRBRF(50BF)/CCRBRF:1.
Checking the case without re-trip,
RetripMode = Retrip Off
M12104-107 v4
1.
Set
RetripMode = Retrip Off.
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,
RetripMode = CB Pos Check
M12104-48 v4
1.
Set
RetripMode = CB Pos Check.
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
t1 and back-up trip after time t2
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,
RetripMode = No CBPos Check
M12104-58 v6
1MRK 505 293-UEN B
Section 7
Testing functionality
Breaker protection REQ650
55
Commissioning manual
© Copyright 2013 ABB. All rights reserved
Summary of Contents for REQ650 1.3 IEC
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