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IB02602004E
For more information visit: www.eaton.com
Instructional Literature
Effective: May 2008
Page
91
Instructions for the FP-6000 Protective Relay
Line Pos Seq Imped Ang:
The Line Positive Sequence Impedance Angle allows the user to
select the positive sequence line impedance angle for the phase
direction control and negative sequence voltage polarized
ground direction control within the FP-6000.
Phase direction is used to supervise the phase overcurrent
elements. The phase direction unit shall be polarized using a
quadrature voltage. The quadrature voltage is compared to the
corresponding phase current to establish a fault direction.
In the case of a 3-phase nearly zero voltage fault, the memorized
voltage, or prefault voltages, shall be used to establish the
correct fault direction, see Figures 15 and 16.
For the negative sequence voltage polarized direction unit, a
negative sequence current is compared to a negative sequence
voltage to establish the fault direction, see Figure 17.
Figure 15. Phase Direction.
Line Zero Seq Imped Ang:
The Line Zero Sequence Impedance Angle allows the user to
select the zero sequence line impedance angle for the zero
sequence voltage polarized ground direction control within the
FP-6000.
Ground direction is used to supervise the ground overcurrent
elements. This setting effects the characteristics of 67V and
67VIX.
IR Gnd Dir Cntrl:
This setting allows the user to select the IRGround Polarizing
Method. Ground direction units are used to supervise the relay
elements that are responsible for tripping ground faults. Ground
direction supervision includes zero sequence voltage polarizing,
negative sequence voltage polarizing and dual polarizing. This
includes single phase to ground and double phase to ground
faults, see figures 17 and 18.
Gnd Dir V 3V0 & V3I0 Source:
These settings allow the user to select if the zero sequence
voltage is calculated internally or measured through the 4th
voltage input and 4th CT. A zero sequence current is compared
to a zero sequence voltage to establish the fault direction in the
zero sequence voltage polarized direction unit. The polarizing
current shall be measured through an independent CT that
reflects current passing through a power transformer neutral or
delta winding. A polarizing current is compared to a zero
sequence current (residual) to establish the fault direction in the
Figure 16. Phase Directional Supervision Logic.
Table 22. Phase Directional Units
UNIT
67P
a
67P
b
67P
c
Polarizing
Vbc
Vca
Vab
Operating
Ia
Ib
Ic
MTA
90
°
-
θ
1
90
°
-
θ
1
90
°
-
θ
1
Table 23. Ground Directional Units
UNIT
67V
67VIX
67Q
67I
pol
Polarizing
Vx or 3Vo
Vx or 3Vo
V2
Ipol (Ix)
Operating
3I0 or Ix
Ix
I2
3Io
MTA
180
°
-
θ
0
180
°
-
θ
0
180
°
-
θ
1
0
°
V>Vmem
I>Imin
Derive Vmem
200ms
0
67P
∠θ
67P
V