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 (Equation 98)
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.
11.6.1.2 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.
11.6.2 Two step overvoltage protection OV2PTOV (59)
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
11.6.2.1 Verifying the settings
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 213
Commissioning manual
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