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1MRK 506 355-UEN A
10.5.7.2
10.5.8
10.5.8.1
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
10. Compare the measured trip time with the setting according to the formula.
11. Reset the thermal memory.
12. Continue to test another function or end the test by changing the test mode setting
to Off.
Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
Breaker failure protection, phase segregated activation and
output CCRBRF
Prepare the IED for verification of settings outlined in section
verify
settings".
The Breaker failure protection, 3-phase activation and output function CCRBRF
should normally be tested in conjunction with some other function that provides a start
signal. An external START signal can also be used.
To verify the settings in the most common back-up trip mode 1 out of 3, it is sufficient
to test phase-to-earth faults.
At mode 2 out of 4 the phase current setting, IP> can be checked by single-phase
injection where the return current is connected to the summated current input. The
value of residual (earth fault) current IN set lower than IP> is easiest checked in back-
up trip mode 1 out of 4.
Checking the phase current operate value,
The check of the IP> current level is best made in FunctionMode = Current and
BuTripMode = 1 out of 3 or 2 out of 4.
1.
Apply the fault condition, including START of CCRBRF, with a current below
the set IP>.
2.
Repeat the fault condition and increase the current in steps until a trip occurs.
3.
Compare the result with the set IP>.
Note! If No CBPos Check or Retrip off is set, only back-up trip can be
used to check set IP>.
Section 10
"Preparing the IED to
IP>
157
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