9.4.9.2 Completing the test
GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v2
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.
9.5 Voltage protection
SEMOD53540-1 v1
9.5.1 Two step undervoltage protection UV2PTUV
M13796-2 v6
Prepare the IED for verification of settings outlined in Section
"Preparing the IED
to verify settings".
9.5.1.1 Verifying the settings
M13796-9 v3
Verification of start value and time delay to operate for Step 1
M13796-29 v10
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 UBase VT
VTprim
1
100
3
<
× ×
sec
IECEQUATION2430 V1 EN-US (Equation 85)
For phase-to-phase measurement:
U
UBase
VT
VTprim
1
100
<
× ×
sec
IECEQUATION2431 V1 EN-US (Equation 86)
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.
1MRK 506 383-UEN A Section 9
Testing functionality by secondary injection
Line distance protection REL650 2.2 IEC 123
Commissioning manual
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