Extended Testing; Completing The Test; Two Step Residual Overvoltage Protection Rov2Ptov - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.6.2.2
11.6.2.3
11.6.3
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
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
1 sec
>
× ×
100 VTprim
3
IECEQUATION2426 V1 EN-US
For phase-to-phase measurement:
U 1 VT sec
>
UBase
× ×
VTprim
100
IECEQUATION2427 V1 EN-US
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.

Extended testing

1. 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 Off. Restore connections and settings to their original values, if they were
changed for testing purposes.

Two step residual overvoltage protection ROV2PTOV

Prepare the IED for verification of settings outlined in Section
to verify settings".
Section 11
(Equation 99)
(Equation 100)
GUID-BE4B4A36-CCEE-4020-B7DC-6A83A43D11F5 v2
M13806-43 v6
SEMOD54358-3 v7
"Preparing the IED
207