6.3.1.3
Measuring the operating limit of set values with shaped load
encroachment characteristics
1.
Subject the IED to healthy normal load conditions for at least two seconds.
2.
Apply the fault condition and slowly decrease the measured impedance to find
the operating value of the phase-to-phase fault A-B for zone 1 according to test
point 1 in figure
. Compare the result of the measurement with the
set value.
3.
to find the operating value for the remaining test points.
Observe that the zones that are not tested have to be blocked and the zone that is
tested has to be released.
4.
to find the operating value for the phase-to-ground fault C-E
Test point 6 is intended to test the directional line of impedance
protection. Since directionality is a common function for all 5
measuring zones, it is only necessary to test point 6 once, in the
forward direction. Directional functionality testing (trip inside, no-
trip outside) should always be carried for all impedance zones set
with directionality (forward or reverse).
6.3.1.4
Measuring the operate time of distance protection zones
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 7 in figure
for zone 1. Compare the result of
the measurement with the setting
t1PP
.
3.
to find the operating time for the phase-to-ground fault
according to test point 7 in figure
. Compare the result of the
measurement with the setting
t1PE
.
4.
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.
6.3.1.5
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Disabled
under
Main menu/Tests/IED test mode/1:TESTMODE
. If another
function is tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/
Function test modes/Impedance/ZQMPDIS(21,Z<)/1:ZQMPDIS
for the function,
1MRK 506 331-UUS A
Section 6
Testing functionality
51
Commissioning Manual
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