Completing The Test; High Impedance Differential Protection Hzpdif; Verifying The Settings - ABB Relion 670 Series Commissioning Manual

1MRK 504 165-UEN E
1. Go to Main menu/Test/Function test modes/Differential protection and make sure that
the restricted earth fault protection, low impedance function REFPDIF is set to
that the four step residual overcurrent function EF4PTOC under Main menu/Test/
Function test modes/Current protection is set to
same current transformer inputs as the transformer differential protection. Make sure
that the transformer differential functions T2WPDIF or T3WPDIF are unblocked.
2. Connect the test set for injection of three-phase currents to the current terminals of the
IED, which are connected to the CTs on the HV side of the power transformer.
3. Increase the current in phase L1 until the protection function operates and note the
operating current.
4. Check that the trip and alarm contacts operate according to the configuration logic.
5. Decrease the current slowly from operate value and note the reset value.
Depending on the power transformer vector group (Yd and so on), the single-phase
injection current may appear as differential current in one or two phases and the
operating value of the injected single-phase current will be different.
6. Check in the same way the function by injecting current in phases L2 and L3 respectively.
7. Inject a symmetrical three-phase current and note the operate value.
8. Connect the timer and set the current to twice the operate value.
9. Switch on the current and note the operate time.
10. Check in the same way the measuring circuits connected to the CTs on the LV side and
other current inputs to the transformer differential protection.
11. Finally check that trip information is stored in the event menu.
12. If available on the test set, a second harmonic current of about 20% (assumes 15%
setting on I1/I2 ratio parameter) can be added to the fundamental frequency in phase L1.
Increase the current in phase L1 above the start value measured in step 6. Repeat test
with current injection in phases L2 and L3 respectively.
The balancing of currents flowing into and out of the differential zone is checked by
primary injection testing.
Fifth harmonic blocking can be tested in a similar way.
11.3.1.2

Completing the test

continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
11.3.2

High impedance differential protection HZPDIF

Prepare the IED for verification of settings as outlined in section
section
11.3.2.1

Verifying the settings

Transformer protection RET670
Commissioning manual
Information on how to use the event menu is found in the operator's
manual.
For more detailed formulas, please refer to the Application manual.
"Preparing for test" in this chapter.
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Testing functionality by secondary injection
Off , since they are configured to the
TESTMODE setting to Off .
"Requirements"
Section 11
Off and
SEMOD54284-86 v5
SEMOD55257-42 v3
and
SEMOD55257-46 v5
97