ABB RET670 Commissioning Manual page 204

Section 11
Testing functionality by secondary injection
198
Harmonic voltage overload feature
Note that during testing the harmonic voltage overload feature the
reactive power overload feature or overcurrent feature may also
give start and operate signals depending on their actual settings.
Therefore it is recommended to switch them off during this test.
Procedure to test inverse time delayed step:
The following points on the inverse curve are defined per relevant IEC/ANSI
standards for time multiplier value set to kHOLIDMT=1.0
UpeakRMS [pu] 1.15
Time [s] 1800
Note that operation of this feature is based on internally calculated
voltage peak RMS value. That means that this feature is also able to
operate for current signals with varying frequency.
Here will be shown how to test the fourth point from the above table. Other points
can be tested in the similar way:
1. Inject 140% of the base current (that is, 1.4 · 0.587A = 0.822A at 50Hz for
this SCB) in phase L1only.
2. Check that function binary output signals STHIDML1 and STHOL are set to
one.
3. Check that function binary output signals TRHOL and TRIP are set to one
after the expected time (for example, 15s for this voltage level in accordance
with the above table) has expired.
4. If any of these signals are used for tripping, signaling and/or local/remote
indication, check that all relevant contacts and LEDs have operated and that
all relevant GOOSE messages have been sent.
5. Check that service value for current in phase L1, on the local HMI under
Main menu/Test is approximately 411A (that is, 0.822A · (500/1) = 411A).
6. Check that service value for voltage across SCB in phase L1, on the local
HMI under Main menu/Test is approximately 140%.
7. Stop injection of all currents (that is, set all currents back to 0A).
8. Check that all above mentioned function binary output signals now have
logical value zero.
9. Repeat above steps 1 - 8 for phase L2 and phase L3.
10. Repeat above steps 1 - 8 to test different points from the above table.
Operation of this feature is based on internally calculated peak RMS voltage value.
That means that this feature is also able to operate for current signals with varying
1.2 1.3 1.4
300 60 15
Transformer protection RET670 2.2 IEC
1MRK 504 165-UEN A
GUID-3C6B2C73-026D-4173-BD4D-1E7E9ADAE160 v3
1.7 2.0 2.2
1 0.3 0.12
GUID-FECBCAD4-16CE-4EFC-9869-9F6D98E2F721 v2
Commissioning manual