6.3
Testing impedance protection functions
6.3.1
Five zone distance protection, quadrilateral and mho
characteristic ZQMPDIS (21)
Prepare the IED for verification of settings as outlined in
Values of the logical signals for ZQMPDIS (21) are available on the local HMI under
Main menu/Tests/Function status/Impedance/ZQMPDIS(21,Z<)/1:ZQMPDIS
.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
6.3.1.1
Quadrilateral characteristics
Consider releasing Zone 1, the Phase selection with load encroachment, quadrilateral
characteristic FDPSPDIS (21) and the Tripping logic SMPPTRC (94).
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 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.
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
and
and tables
.
To verify the settings the following fault types should be tested:
•
One phase-to-phase fault
•
One phase-to-ground fault
The shape of the operating characteristic depends on the values of the setting parameters.
Phase-to-phase faults
The angles a (angle on blinder in second quadrant for forward direction), b (load angle
determining the load impedance area), c (angle to blinder in fourth quadrant for
forward direction), d (line angle) and e (angle for ground compensation factor KN) in
the figures below are adjusted with the parameters
ArgNegRes
,
ArgLd
,
ArgDir
,
LineAng
and
KNAng
respectively.
Section 6
1MRK 506 331-UUS A
Testing functionality
46
Commissioning Manual
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