7 Acceptance/Protection Function Test Guide
7-20
L-PRO 4000 User Manual
D02706R02.30
The following formulae were used to calculate the voltages for the tables (they
may be used for any other desired fault voltage):
Test Phase Angle
Offset the nominal phase angles toward the other faulted phase angle by:
Example of this calculation using the 70% voltage reduction from the B-C
fault, for details see Table 7.15: B-C Fault Voltage Injections on page 7-19:
Phase B-C voltage angle = -90
with respect to A-N voltage phasor.
Fault Voltage = 70% reduction of phase-to-phase nominal
For B-C fault adjust Phase B angle toward Phase C angle and adjust Phase C
angle toward Phase B angle:
B Phase Angle = -120
- 32.5
= -152.5
C Phase Angle = +120 +32.5
= 152.5
where
V
Fault
- phase-to-phase fault voltage
V
Nominal
- phase-to-neutral nominal voltage
(24)
(25)
(26)
(27)
(28)
V
Fault
2
----------------
2
V
Nominal
2
-----------------------
2
+
Test voltage magnitude =
60
V
Fault
V
Nominal
-----------------------
atan
–
115
V
=
90
–
–
115
V
90
70
percent
–
+
34.5
V
90
–
=
–
34.5
2
----------
2
66.4
2
----------
2
+
1399.8
37.4
V
=
=
Faulted Test Voltage Magnitudes =
Faulted Phase Angle =
60
34.5
66.4
----------
atan
–
60
27.5
32.5
=
–
=
Summary of Contents for L-PRO 4000
Page 1: ...L PRO 4000 Transmission Line Protection Relay User Manual Version 2 3 Rev 0...
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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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