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.
12.6.1.2 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.
12.6.2 Two step overvoltage protection OV2PTOV
Prepare the IED for verification of settings outlined in section "Requirements" and
section
"Preparing for test" in this chapter.
12.6.2.1 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:
For phase-to-earth measurement:
U UBase VT
VTprim
1
100
3
>
× ×
sec
IECEQUATION2426 V1 EN (Equation 97)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
>
× ×
sec
IECEQUATION2427 V1 EN
(Equation 98)
4. Decrease the voltage slowly and note the reset value.
5. Set and apply about 20% higher voltage than the measured operate value for one
phase.
Section 12 1MRK502053-UEN B
Testing functionality by secondary injection
178 Generator protection REG670 2.0 IEC
Commissioning manual
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