10.5 Current protection
10.5.1 Instantaneous phase overcurrent protection 3-phase output
PHPIOC
Prepare the IED for verification of settings outlined in section "Preparing the IED to
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.
10.5.1.1 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.
Observe: Do not exceed the maximum permitted overloading of
the current circuits in the IED.
5. Compare the measured operating current with the set value.
6. Set the operation mode to 2 out of 3 and inject current into one of the phases.
Check - no operation.
10.5.1.2 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.
10.5.2 Four step phase overcurrent protection 3-phase output
OC4PTOC
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 145
Commissioning manual
To Next Page
Loading...
