Figure. 5.4.4 - 33. Angle tracking of the Idir> function (3LN/3LL + U
0
mode).
Please note in the picture above that the tripping area is linked to the angle of the positive sequence
voltage
U
1
. The angle of the positive sequence current
I
1
is compared to
U
1
angle, and if the fault is in
the correct direction, it is possible to perform a trip when the amplitude of
I
L1
,
I
L2
or
I
L3
increases
above the pick-up limit.
If the 3LL mode is used without the
U
0
measurement in a single-phase fault situation, the voltage
reference comes from the healthy phase and the current reference from the faulty phase. In a short-
circuit the angle comes from impedance calculation.
Figure. 5.4.4 - 34. Operation sector area when the sector center has been set to -45 degrees.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00001
79
Summary of Contents for Generator Commander
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