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.
Checking the re-trip with current check,
RetripMode = CB Pos Check
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 the start of CCRBRF, with the current
below the set current value.
5.
Verify that no re-trip, and no back-up trip is obtained.
Checking re-trip without current check
1.
Set
RetripMode
=
No CBPos Check
.
2.
Apply the fault condition, including start of CCRBRF, well above the set current
value.
3.
Verify that re-trip is achieved after the set time
t1
, and the back-up trip after time
t2
.
4.
Apply the fault condition, including start of CCRBRF, with current below set
current value.
5.
Verify that re-trip is achieved after set time
t1
, but no back-up trip is obtained.
10.4.9.5
Verifying the back-up trip mode
In the cases below it is assumed that
FunctionMode
=
Current
is selected.
Checking that back-up tripping is not achieved at normal CB tripping
Use the actual tripping modes. The case below applies to re-trip with current check.
1.
Apply the fault condition, including start of CCRBRF, with phase current well
above set value
IP>
.
2.
Interrupt the current, with a margin before back-up trip time,
t2
. It may be made
at issue of re-trip command.
3.
Check that re-trip is achieved, if selected, but no back-up trip is obtained.
The normal mode
BuTripMode
=
1 out of 3
should have been verified in the tests
above. In applicable cases the modes
1 out of 4
and
2 out of 4
can be checked. Choose
the mode below, which corresponds to the actual case.
Checking the case
BuTripMode = 1 out of 4
It is assumed that the earth-fault current setting
IN>
is below phase current setting
IP>
.
1MRK 511 360-UEN A
Section 10
Testing functionality by secondary injection
Bay control REC670 2.1 IEC
101
Commissioning manual