Extended testing
M13796-35 v8
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
M13796-25 v5
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.
11.6.2 Two step overvoltage protection OV2PTOV
M13806-2 v6
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
11.6.2.1 Verifying the settings
M13806-9 v2
Verification of
single-phase voltage and time delay to operate for
Step 1
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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-US (Equation 100)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
>
× ×
sec
IECEQUATION2427 V1 EN-US (Equation 101)
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.
6. Measure the time delay for the TR1 signal and compare it with the set value.
7. Check the inverse time delay by injecting a voltage corresponding to 1.2 ×
U1>.
8. Repeat the test to check the inverse time characteristic at different over-
voltage levels.
9. Repeat the above described steps for Step 2 of the function.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
198 Line differential protection RED670 2.2 IEC
Commissioning manual
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