1.
Set
RetripMode = No CBPos Check.
2.
Apply the fault condition, including START of CCSRBRF, 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 CCSRBRF, with current below set current
value.
5.
Verify that re-trip is achieved after set time
t1, but no back-up trip is obtained.
6.
Disconnect AC and start input signals.
12.5.10.4
Verifying the back-up trip mode
SEMOD128582-115 v2
In the cases below it is assumed that
FunctionMode = Current is selected.
Checking that back-up tripping is not achieved at normal CB tripping
SEMOD128582-119 v4
Use the actual tripping modes. The case below applies to re-trip with current check.
Procedure
1.
Apply the fault condition, including START of CCSRBRF, with phase current well above set
value
IP>.
2.
Arrange switching the current off, 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.
4.
Disconnect AC and start input signals.
12.5.10.5
Verifying instantaneous back-up trip at “CB faulty” condition
SEMOD128582-167 v4
Applies in a case where signal “CB faulty and unable to trip” is connected to input CBFLT.
Procedure
1.
Repeat the check of back-up trip time. Disconnect current and START input signals.
2.
Activate the input CBFLT. The output CBALARM (CB faulty alarm) should appear after set
time
tCBAlarm. Keep the input activated.
3.
Apply the fault condition, including START of CCSRBRF, with current above set current
value.
4.
Verify that back-up trip is obtained without intentional delay, for example, within 20ms
from application of START.
5.
Disconnect injected AC and input signals.
12.5.10.6
Verifying the case
FunctionMode = Contact
SEMOD128582-183 v4
It is assumed that re-trip without current check is selected,
RetripMode = No CBPos Check.
Procedure
1.
Set
FunctionMode = Contact.
2.
Apply input signal for CB closed to relevant input or inputs CBCLD
3.
Apply input signal, or signals for START of CCSRBRF. The value of current could be low.
4.
Verify that re-trip and back-up trip are achieved after set times.
5.
Disconnect the START signal(s). Keep the CB closed signal(s).
6.
Apply input signal(s), for START of CCSRBRF. The value of current could be low.
7.
Arrange disconnection of CB closed signal(s) well before set back-up trip time
t2.
8.
Verify that back-up trip is not achieved.
9.
Disconnect injected AC and START input signals.
Section 12
1MRK 502 067-UEN B
Testing functionality by secondary injection
170
Commissioning manual
