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).
10.4.5.2 Measuring the operating time of distance protection zones
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 10 in figure 20 and table 23 for zone 1. Compare the result
of the measurement with the setting tPP.
3. Repeat steps 1 to 2 to find the operating time for the phase-to-earth fault
according to test point 10 in figure 21 and table 24. Compare the result of the
measurement with the setting tPE.
4. Repeat steps 1 to 2 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.
10.4.6 Phase selection, quadrilateral characteristic with settable
angle FRPSPDIS
Prepare the IED for verification of settings as outlined in section
"Preparing for test"
in this chapter.
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 30% of the rated current.
Ensure that the maximum continuous current of an 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
22 and 23 should be
tested. See also tables
25 and 26 for information.
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
104 Line distance protection REL670 2.1 IEC
Commissioning manual
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