10.4.4 Faulty phase identification with load encroachment
FMPSPDIS
There is no specific test routine for this function. The function is tested in conjunction
with other impedance (mho) functions.
10.4.5 Distance protection zones, quadrilateral characteristic,
separate settings ZMRPDIS
Prepare the IED for verification of settings as outlined in section "Preparing for test"
in this chapter.
Consider releasing Zone 1 with the Phase selection with load encroachment,
quadrilateral characteristic (FRPSDPIS). If the autorecloser is not released and in
service, trip will always be three phase.
Measure operating characteristics during constant current conditions. Keep the
measured current as close as possible to its rated value or lower. But make sure it is
higher than 30% of the rated current.
Ensure that the maximum continuous current in an IED does not exceed four times its
rated value, if the measurement of the operating characteristics runs under constant
voltage conditions.
The test procedure has to take into consideration that the shaped load encroachment
characteristic is active. It is therefore necessary to check the setting. To verify the
settings with the shaped load encroachment characteristic the test should be carried
out according to figures
20 and 21 and tables 23 and 24. In cases where the load
encroachment characteristic is activated tests according to the adjusted figures should
be carried out.
To verify the settings for the operating points according to the following fault types
should be tested:
• One phase-to-phase fault
• One phase-to-earth fault
The shape of the operating characteristic depends on the values of the setting
parameters.
The figures illustrating the characteristic for the distance protection
function can be used for settings with and without load encroachment.
The solid lines designate the diagram applicable when the load current
compensation is active. The solid line and all test points except 13 are
valid for this case.
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
100 Line distance protection REL670 2.1 IEC
Commissioning manual
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