Completing The Test - ABB REG670 Commissioning Manual

Section 13
Testing functionality by secondary injection
13.3.1.2
142
transformer differential functions T2WPDIF (87T) or T3WPDIF (87T) 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 A 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 phase shift/vector group (Yd (Wye/Delta)
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 B and C
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.
Information on how to use the event menu is found in the
operator's manual.
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 A. Increase the current in phase A above the pickup value measured in
step 6. Repeat test with current injection in phases B and C 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.
For more detailed formulas, please refer to the Application
manual.

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were
changed for testing purposes.
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
1MRK 502 073-UUS A
SEMOD54284-86 v5
Commissioning manual