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1.
Apply the fault condition, including START of CCRBRF, with a current just
below set
IN>
.
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.
11.5.7.3
Checking the re-trip and back-up times
M12104-93 v11
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
RetripMode
=
CB Pos Check
.
1.
Apply the fault condition, including start of CCRBRF, well above the set
current value. Measure the time from START of CCRBRF.
2.
Check the re-trip
t1
and back-up trip times
t2
and
t3
.
In applicable cases, the back-up trip for multi-phase start
t2MPh
and back-up
trip 2,
t2
and
t3
can also be checked. To check
t2MPh
, a two-phase or three-
phase start shall be applied.
11.5.7.4
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
is selected.
Checking the case without re-trip,
RetripMode = Retrip Off
M12104-107 v7
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
M12104-48 v7
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 are obtained.
Checking re-trip without current check
M12104-58 v9
Section 11
1MRK 505 378-UEN A
Testing functionality by secondary injection
184
Line differential protection RED670 2.2 IEC
Commissioning manual
Summary of Contents for RED670 Relion 670 series
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