10.5.7.3 Verifying the re-trip mode
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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
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1. Set RetripMode = Retrip Off.
2. Apply the fault condition, including the START of CCRWRBRF, well above
the set current value.
3. Verify that no re-trip, but back-up trip is achieved after set time delay of t2.
Checking the re-trip with current check
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1. Set RetripMode = CB Pos Check.
2. Apply the fault condition, including the START of CCRWRBRF, 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 CCRWRBRF, with the
current below the set current value IP>.
5. Verify that no re-trip and no back-up trip are obtained.
Checking re-trip without current check
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1. Set RetripMode = No CBPos Check.
2. Apply the fault condition, including the START of CCRWRBRF, 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 the START of CCRWRBRF, with the
current below the set current value IP>.
5. Verify that re-trip is achieved after set time t1, but no back-up trip is obtained.
10.5.7.4 Verifying the back-up trip
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In the case below, it is assumed that FunctionMode = Current is selected.
Checking that back-up tripping is not achieved at normal CB tripping
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Use the actual tripping modes. The case below applies to re-trip with current check.
1. Apply the fault condition, including the START of CCRWRBRF, with the
phase current well above the 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.
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
116 Railway application RER670 2.2 IEC
Commissioning manual
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