Adjustment of Protection Zones in an Impedance Relay for Two Adjacent Transmission Lines

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This Demonstration shows how to calculate adjustments for the protection zones in an impedance relay between two adjacent transmission lines.
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Contributed by: Daniel Motter (February 2012)
Open content licensed under CC BY-NC-SA
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References
[1] W. D. Stevenson, Jr., Elements of Power System Analysis, 3rd ed., New York: McGraw–Hill, New York, 1975.
[2] C. R. Mason, "Line Protection with Distance Relays," Art & Science of Protective Relaying, Hoboken, NJ: Wiley, 1956 pp. 295–321.
[3] "Distance Protection," Network Protection & Automation Guide, Paris, France: AREVA, 2005 pp. 171–191.
[4] "Impedance Relay and Protection Assemblies," Zurich, Switzerland: ABB, 1999.