Checking The Residual (Earth Fault) Current Operate Value In> Set Below Ip; Checking The Re-Trip And Back-Up Times; Verifying The Re-Trip Mode - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
11.4.9.3 Checking the residual (earth fault) current operate value IN> set below IP>
Check the low set IN> current where setting FunctionMode = Current and setting BuTripMode = 1 out
of 4
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. Note that the
START signal shall be re-applied for each new current value.
3. Compare the result with the set IN>.
4. Disconnect AC and START input signals.
11.4.9.4

Checking the re-trip and back-up times

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 =
UseFunctionMode.
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.
11.4.9.5

Verifying the re-trip mode

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 = Off
1. Set RetripMode = 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 = UseFunctionMode
1. Set RetripMode = UseFunctionMode.
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 = Always.
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.
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