Eaton Cutler-Hammer FP 5000 Instruction Leaflet page 96

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-
5000.
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 three-phase nearly zero
voltage fault, the memorized voltage, or
prefault voltages, shall be used to establish the
correct fault direction, see figures 5.1 and 5.2.
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 5.3.
a b c
V , (V , V )
a b c
I (I , I )
θ
1
Figure 5-1. Phase Direction
I>Imin
V
V>Vmem
Derive Vmem
Figure 5-2. Phase Directional Supervision Logic
Effective Date: 12/05
FP-5000
MTA (Maximum Torque
Angle)
V (V , V )
bc ca ab
200ms
0
For more information visit:
Effective Date: 12/05
Phase Directional Units
Unit 67P
a
Polarizing V
bc
Operating I
a
90 - θ
MTA
Line Zero Seq
Imped Ang: The Line Zero Sequence Impedance Angle
allows the user to select the zero se
quence line impedance angle for the zero
sequence voltage polarized ground
direction control within the FP-5000.
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 IR
Ground 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 polariz-
ing. This includes single phase to ground and
double phase to ground faults, see figures 5-3
and 5-4.
Ground Directional Units
Unit 67V
Polarizing V or 3V
x
Operating 3I0 or I
180 - θ
MTA
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 polariz
ing current is compared to a zero sequence
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67P 67P
b c
V V
ca ab
I I
b c
90 - θ 90 - θ
1 1 1
67VIX 67Q
V or 3V V
o x o 2
I I
x x 2
180 - θ 180 - θ
0 0 1
67P
67P∠θ
Page 5-41
IL17569C
Page 5-41
67I
pol
I (I )
pol x
3I
o
0