7 Acceptance/Protection Function Test Guide
7-14
L-PRO 4000 User Manual
D02706R02.30
21P1 Phase
Distance Test
(Zone 1 Single-Phase Under Impedance Test tested as 3-phase fault)
Settings
• Positive Sequence Secondary Line Impedance (100% of line)= 5.9
• Positive Sequence Line Angle = 80
• 21P1 = 4.72
(Maximum Reach = 80% of line at maximum torque angle
of 80
)
• Time Delay = 0 (expect 1.3 cycles, 22 ms or less)
• Delta Current Supervision = 7.0 A (minimum phasor difference between
any 2 phases to allow 21P Trip)
Figure 7.11: Phase Distance Logic (21P)
Preliminary Calculations
Since this is a balanced 3-phase test, there is no Zero Sequence Current, so Z
is calculated as:
The minimum 3-phase current required is:
(Remember:
I
Delta
is the phasor difference between any 2-phase currents; add
5% to ensure the Minimum
I
DeltaSupervision
Logic is high for this test).
where
Z
- Phase Impedance
V
Phase
- Phase Voltage
I
Phase
- Phase Current
(17)
Z
V
Phase
I
Phase
-----------------
=
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