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Section 11
Testing functionality by secondary injection
11.5.1.2
138
<
Vpickup
VT
´
´
VBase
100
VTprim
ANSIEQUATION2431 V1 EN
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:
TD
1
( )
=
t s
æ
ö
V
-
1
ç
÷
<
Vpickup
è
ø
ANSIEQUATION2428 V1 EN
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
The tests above can be repeated for 2 out of 3 and for 3 out of 3 operation mode.
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.
sec
1MRK 511 366-UUS -
(Equation 90)
(Equation 91)
Commissioning manual
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