Completing The Test; Voltage Protection; Two Step Undervoltage Protection Uv2Ptuv; Verifying The Settings - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.5.16.2
11.6
11.6.1
11.6.1.1
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection

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.

Voltage protection

Two step undervoltage protection UV2PTUV

Prepare the IED for verification of settings outlined in Section
to verify settings".

Verifying the settings

Verification of start value and time delay to operate for Step 1
1. Check that the IED settings are appropriate, especially the START value, the
definite time delay and the 1 out of 3 operation mode.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the voltage in one of the phases, until the START signal
appears.
4. Note the operate value and compare it with the set value.
The operate value in secondary volts is calculated according
to the following equations:
For phase-to-earth measurement:
U 1 UBase VT sec
<
× ×
VTprim
100
3
IECEQUATION2430 V1 EN-US
For phase-to-phase measurement:
U VT
1 sec
<
UBase
× ×
100 VTprim
IECEQUATION2431 V1 EN-US
5. Increase the measured voltage to rated load conditions.
6. Check that the START signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower
than the measured operate value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
Section 11
GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v2
SEMOD53540-1 v1
M13796-2 v6
"Preparing the IED
M13796-9 v3
M13796-29 v10
(Equation 96)
(Equation 97)
205