7 Acceptance/Protection Function Test Guide
7-8
L-PRO 4000 User Manual
D02706R02.30
Figure 7.7: Quadrilateral Available for 21P and 21N Only
Basic Testing Calculations
where
kV
- Nominal Primary Voltage
PT Ratio
- Potential Transformer Ratio
Zero Sequence Impedance calculations for phase-to-ground impedance ele-
ment tests (using secondary Positive and Zero Sequence Line Impedances):
Nominal primary voltage =
(1)
Nominal secondary phase-to-phase voltage =
(2)
Nominal secondary phase-to-neutral voltage =
(3)
(4)
(5)
Reactive (x)
Resistive (R)
Reverse
Directional
Supervision
Forward
Line
Angle
R1
230
kV
kV
PTRatio
----------------------
230
kV
2000
----------------
115
V
=
=
115
V
3
-------------
66.4
V
=
Z
1
5.9
80
1.03
j
5.81
+
=
=
Z
0
16.0
74
4.41
j
15.38
+
=
=
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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