7 Acceptance/Protection Function Test Guide
7-16
L-PRO 4000 User Manual
D02706R02.30
Ph A: 300
–
301, 5.3 A
–
-80
Ph B: 302
–
303, 5.3 A
–
-200
Ph C: 303
–
304, 5.3 A
–
+40
Expect operating time less than 1.3 cycles with CCVT algorithm dis-
abled.
End of 21P1 test.
21P2 Phase
Distance Test
Zone 2 Phase Under Impedance tested as 2-phase fault
Settings
• Positive Sequence Secondary Line Impedance (100% of line) = 5.9
Pos-
itive Sequence Line Angle (Z1) = 80
• 21P2= 7.38
(Maximum Reach = 125% of line, 24.25 miles at maximum
torque angle of 80
)
• Time Delay = 400 ms (expect 1.0 to 1.3 cycle additional delay due to in-
herent detection and contact times)
• Delta Current Supervision = 3.0 A (minimum phasor difference between
any 2 phases to allow 21P2 Trip)
This test example shows how to test for a phase-to-phase fault.
Determine the voltage and current quantities required to perform this test.
1. Determine the minimum current required (as per Idelta supervision setting).
2. Determine an appropriate fault voltage to use for the test.
3. Determine the 3-phase voltage phasors required to create the fault voltage.
1. Minimum current required for this test:
I delta Supervision Setting (the phasor difference of 2 phases) = 3.0 A. Cur-
rent is injected into polarity of B-phase and out of polarity of C-phase.
Therefore B-phase and C-phase currents are equal in magnitude but 180
out of phase.
The minimum delta current required = 3.0 A; add 5% to ensure supervision is
met:
Since B-phase = C-phase, actual minimum current required is equal to
(19)
3.0 105
percent
3.2
A
=
Summary of Contents for L-PRO 4000
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Page 252: ...Appendix B IED Settings and Ranges Appendix B 34 L PRO 4000 User Manual D02706R02 30...
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