Hitachi Relion 670 Series Commissioning Manual page 186

Section 11
Testing functionality by secondary injection
11.5.16.3 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.
11.6 Voltage protection
11.6.1 Two step undervoltage protection UV2PTUV (27)
Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
11.6.1.1 Verifying the settings
Verification of pickup value and time delay to trip for Step 1
1. Check that the IED settings are appropriate, especially the PICKUP 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 PICKUP signal appears.
4. Note the trip value and compare it with the set value.
For phase-to-ground measurement:
Vpickup
ANSIEQUATION2430 V1 EN-US
For phase-to-phase measurement:
Vpickup
ANSIEQUATION2431 V1 EN-US
5. Increase the measured voltage to rated load conditions.
6. Check that the PICKUP signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower than the measured
trip 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 × Vpickup<.
180
The trip value in secondary volts is calculated according to the following equations:
<
VBase VT sec
´ ´
100 3 VTprim
<
VT sec
´ ´
VBase
100 VTprim
For example, if the inverse time curve A is selected, the trip signals TRST1 and TRIP trip
after a time corresponding to the equation:
© 2017 - 2023 Hitachi Energy. All rights reserved
1MRK506371-UUS Rev. M
GUID-FEA7B2D1-3F4A-43FD-98F8-EC3584E5B511 v1
"Requirements" and section
Line distance protection REL670
Commissioning manual
SEMOD53540-1 v1
M13796-2 v6
"Preparing
M13796-9 v3
M13796-29 v11
(Equation 94)
(Equation 95)