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14.3
130
Line differential protection, phase
segregated (DIFL)
4.
Disconnect the voltages from the terminal and connect only one
phase to all three voltage inputs of the terminal.
5.
Increase the measured voltage to the rated phase value and observe
the values of the differential and bias currents, presented on the ter-
minal.
They must correspond to the following values:
IDiffL1
=
IDiffL2
=
IDiffL3
IBiasL1
IBiasL2
IBiasL3
=
=
6.
With the terminal in normal operation, not in Test mode, and with the
line energised, the I
service report menu with CCComp temporary set to Off at both ter-
minals. Thereafter measure the values with the CCComp set to On.
Note! Setting CCComp to Off might cause the terminal to trip. Therefore
make sure that the trip outputs are blocked.
7.
Check the charging current compensation by comparing the mea-
sured I
values.
DiffLx
The measured I
DiffLx
CCC used.
8.
Remove the external blocking of the trip signal when this test has
been successfully performed.
Completing the test
Continue to test another function or complete the test by setting the test mode to off.
⋅
2 U
------------------------------------------- -
=
⋅
XC0 CTFactor
U
------------------------------------------- -
=
⋅
XC0 CTFactor
, I
and I
are measured under the
DiffL1
DiffL2
DiffL3
shall be near zero in each separate phase with the
Chapter 13
Verifying settings by secondary
injection
(Equation 9)
(Equation 10)
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