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1MRK 504 160-UEN -
10.3.2.2
10.4
10.4.1
10.4.1.1
Transformer protection RET650 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
in the neutral-to-earth circuit with the same phase angle and with polarity
corresponding to an internal fault.
8.
Increase the current injected in L1, and note the operate value. Decrease the
current slowly and note the reset value.
9.
Inject current into terminals L2 and L3 in the same way as in step 7 above and
note the operate and reset values.
10. Inject a current equal to 10% of rated current into terminal L1.
11. Inject a current in the neutral-to-earth circuit with the same phase angle and with
polarity corresponding to an external fault.
12. Increase the current to five times the operating value and check that the
protection does not operate.
13. Finally check that trip information is stored in the event and disturbance
recorder.
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.
Current protection
Instantaneous phase overcurrent protection 3-phase output
PHPIOC
Prepare the IED for verification of settings outlined in section
verify
settings".
To verify the settings the following fault type should be tested:
•
Phase-to-earth fault
Ensure that the maximum continuous current, supplied from the current source used
for the test of the IED, does not exceed four times the rated current value of the IED.
Measuring the operate limit of set values
1.
Inject a phase current into the IED with an initial value below that of the setting.
2.
Set the operation mode to 1 out of 3.
3.
Increase the injected current in the Ln phase until the TRL (n=1–3) signal
appears.
4.
Switch the fault current off.
Section 10
"Preparing the IED to
71
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