ABB Relion 670 Series Commissioning Manual page 126

Section 11
Testing functionality by secondary injection
11.4.18.2 Completing the test
Continue to test another function or end the test by navigating to Main menu/Test/IED test mode/
TESTMODE: 1 and change the IEDTestMode setting to Off. Restore connections and settings to
their original values, if they were changed for testing purposes.
11.5 Voltage protection
11.5.1 Two step undervoltage protection UV2PTUV
Prepare the IED for verification of settings as outlined in section
section
11.5.1.1 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.
For phase-to-earth measurement:
U
100
IECEQUATION2430 V1 EN-US
For phase-to-phase measurement:
U
100
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.
9. Check the inverse time delay by injecting a voltage corresponding to 0.8 × U1<.
120
The dead time between two set injection pulses of 100ms is less than the set
tReset time, otherwise the function does not operate.
"Preparing for test" in this chapter.
The operate value in secondary volts is calculated according to the following
equations:
1 UBase VT sec
<
× ×
VTprim
3
1 VT sec
<
UBase
× ×
VTprim
For example, if the inverse time curve A is selected, the trip signals TR1 and
TRIP operate after a time corresponding to the equation:
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1MRK 511 403-UEN Rev. K
GUID-FEA7B2D1-3F4A-43FD-98F8-EC3584E5B511 v1
"Requirements" and
Bay control REC670
Commissioning manual
SEMOD53540-1 v1
M13796-2 v6
M13796-9 v3
M13796-29 v11
(Equation 20)
(Equation 21)