Observe that the zones that are not tested have to be blocked and the zone that is tested has to be
released.
4. Repeat steps 1 to 3 to find the operating value for the phase-to-ground fault C-E according to figure
26 and table 21.
Test points 8, 9. 10 and 11 are intended to test the directional lines of impedance
protection. Since directionality is a common function for all 5 measuring zones, it is
only necessary to test points 8, 9. 10 and 11 once in the forward direction in order
to test the accuracy of directionality (directional angles). Directional functionality
testing (trip inside, no-trip outside) should always be made for all impedance zones
set with directionality (forward or reverse).
11.4.1.2 Measuring the operating time of distance protection zones
M14944-154 v6
Procedure:
1. Subject the IED to healthy normal load conditions for at least two seconds.
2. Apply the fault condition to find the operating time for the phase-to-phase fault according to test
point 12 in figure 25 and table 20 for zone 1. Compare the result of the measurement with the
setting t1PP.
3. Repeat steps 1 to 2 to find the operating time for the phase-to-ground fault according to test point
12 in figure
26 and table 21. Compare the result of the measurement with the setting t1PE.
4. Repeat steps 1 to 3 to find the operating time for all other used measuring zones.
Observe that the zones that are not tested have to be blocked and the zone that is tested has to be
released.
11.4.1.3 Completing the test
M14944-167 v3
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.4.2 Phase selection, quad, fixed angle, load encroachment FDPSPDIS
(21)
M13906-3 v10
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to verify settings".
The phase selectors operate on the same measuring principles as the impedance measuring zones. So it
is necessary to follow the same principles as for distance protection, when performing the secondary
injection tests.
Measure operating characteristics during constant current conditions. Keep the measured current as
close as possible to the rated value of its associated input transformer, or lower. But ensure that it is
higher than the set minimum operating current.
Ensure that the maximum continuous current to the IED does not exceed four times its rated value, if the
measurement of the operating characteristics runs under constant voltage conditions.
To verify the settings the operating points according to figures
27 and 28 should be tested. See also
tables 22 and 23 for information.
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
110 Transformer protection RET670
Commissioning manual
© 2017 - 2021 Hitachi Power Grids. All rights reserved
To Next Page
Loading...
