IECEQUATION2428 V1 EN (Equation 96)
where:
t(s) Operate time in seconds
k1 Settable time multiplier of the function for step 1
U Measured voltage
U1< Set start voltage for step 1
For example, if the measured voltage jumps from the rated value to 0.8 times the
set start voltage level and time multiplier k1 is set to 0.05 s (default value), then
the TR1 and TRIP signals operate 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.
10.6.1.2 Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
10.6.2 Two step overvoltage protection OV2PTOV
Prepare the IED for verification of settings outlined in section
"Preparing the IED to
verify settings".
10.6.2.1 Verifying the settings
Verification of single-phase voltage and time delay to operate for Step
1
1. Apply single-phase voltage below the set value U1>.
2. Slowly increase the voltage until the ST1 signal appears.
3. Note the operate value and compare it with the set value U1>.
The operate value in secondary volts is calculated according to
the following equations:
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
172 Line distance protection REL670 2.1 IEC
Commissioning manual
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