VoltageRestOverCurr(51V,2(I>/V<))/VRPVOC(51V,2(I>/V<)):1/
Undervoltage and set the setting Operation_UV = Enabled to activate the
undervoltage stage.
13. Slowly decrease the voltage in two phases simultaneously, until the STUV and
PICKUP signals appear.
14. Note the trip value. The set trip value in secondary volts is calculated according
to the following equation:
Pickup Volt VBase VT
VTprim
_ sec
100
3
× ×
ANSIEQUATION2436 V2 EN-US (Equation 93)
If the VRPVOC function is used as an overcurrent protection with
undervoltage seal-in, it is necessary to first inject sufficient
current to activate the STOC signal before the under-voltage step
is allowed to trip. In order to achieve that, apply symmetric three-
phase voltages at their rated value and then inject a current IA that
is 200% higher than the set tripping level. Then slowly decrease
the voltage in two phases simultaneously, until the STUV and
PICKUP signals appear.
15. Increase slowly the applied voltages of the previous two phases and note the reset
value.
16. Check that the trip output of the relay is connected to the input channel of the test
in order to stop the injection and measure the trip time.
17. Inject symmetric three-phase voltages at their rated value and check that the
STUV and PICKUP signals reset as well as the trip signals of the function block
(TRIP and TRUV).
18. Instantaneously decrease the voltage in two phases simultaneously to a value 20%
lower than the set trip value (take into account the previous note if VRPVOC is
configured in ACT with the undervoltage seal-in feature).
19. Measure the definite time delay for the TRUV and TRIP signals and compare it
with the set value tDef_UV.
20. Check that pickup and trip information is stored in the event menu.
13.5.14.2 Completing the test
GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v2
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.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
216 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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