11.4.2 Phase selection, quad, fixed angle, load encroachment
FDPSPDIS (21)
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
25 and 26 should be tested.
See also tables
20 and 21 for information.
R
X
RFltFwdPG
1
3
)1( XNX +
5
2
4
ArgNegRes
85%
50% of RLdFwd
6
ANSI09000734-2-en.vsd
)
/(
loop
W
)/(
loop
W
7
ANSI09000734 V2 EN
Figure 25: Operating characteristic for phase selection function, forward direction
single-phase faults
Section 11 1MRK 504 165-UUS -
Testing functionality by secondary injection
118 Transformer protection RET670 2.2 ANSI
Commissioning manual
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