Verifying The Back-Up Trip Mode - ABB REG670 Commissioning Manual
Generator protection, relion 670 series
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- Technical manual (1298 pages) ,
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1MRK 502 073-UEN A
13.5.8.5
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Testing functionality by secondary injection
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
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.
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.
BuTripMode = 1 out of 4
Checking the case
It is assumed that the earth-fault current setting IN> is below phase current setting
IP>.
1.
Set BuTripMode = 1 out of 4.
2.
Apply the fault condition, including start of CCRBRF, with one-phase current
below set IP> but above IN>. The residual earth-fault should then be above
set IN>.
3.
Verify that back-up trip is achieved after set time. If selected, re-trip should
also appear.
4.
Disconnect AC and START input signals.
Section 13
M12104-58 v9
M12104-146 v5
M12104-150 v8
M12104-165 v6
189
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