5. Increase the measured voltage to rated load conditions.
6. Check that the PICKUP signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower
than the measured trip value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
9. Check the inverse time delay by injecting a voltage corresponding to 0.8 ×
Vpickup<.
For example, if the inverse time curve A is selected, the trip
signals TRST1 and TRIP trip after a time corresponding to the
equation:
( )
1
1
TD
t s
V
Vpickup
=
æ ö
-
ç ÷
<
è ø
ANSIEQUATION2428 V1 EN-US (Equation 96)
where:
t(s) Trip time in seconds
TD1 Settable time multiplier of the function for step 1
V Measured voltage
Vpickup< Set pickup voltage for step 1
For example, if the measured voltage jumps from the rated value to 0.8 times the
set pickup voltage level and time multiplier TD1 is set to 0.05 s (default value),
then the TRST1 and TRIP signals trip at a time equal to 0.250 s ± tolerance.
10. The test above can be repeated to check the inverse time characteristic at different
voltage levels.
11. Repeat the above described steps for Step 2 of the function.
Extended testing
M13796-35 v8
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
13.6.1.2 Completing the test
M13796-25 v5
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
220 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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