6. Transmission Line Models Prof. Mack Grady, TAMU
Author : tatiana-dople | Published Date : 2025-05-12
Description: 6 Transmission Line Models Prof Mack Grady TAMU Relay Conference Tutorial Topic 6 March 31 2015 1 Volts per meter for h r Wire over Earth capacitance 2π 8854 pF per meter length 556 pF meter ln10000 92 C 60 pfm
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Transcript:6. Transmission Line Models Prof. Mack Grady, TAMU:
6. Transmission Line Models Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 1 Volts per meter for h >> r. Wire over Earth capacitance 2π • 8.854 pF per meter length = 55.6 pF / meter ln(10000) = 9.2, C = 6.0 pf/m ln(1000) = 6.9, C = 8.1 pf/m ln(100) = 4.6, C = 12.1 pf/m Reasonable estimate is 10 pF/m Electric Field 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 2 Wire over Earth inductance for h >> r. (4π •10-7) / 2π Henries per meter length = 0.2 μH/m ln(10000) = 9.2, L = 1.8 μH/m ln(1000) = 6.9, L = 1.4 μH/m ln(100) = 4.6, L = 0.92 μH/m Reasonable estimate is 1 μH/m 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 3 Figure 8. Equivalent Radius for Three Common Types of Bundled Phase Conductors Symmetric bundles have an equivalent radius 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 4 Three phases If the transmission line is symmetric, then the “P matrix” has the equal diagonal, equal off-diagonal property that permits 0-1-2 analysis rather than a-b-c analysis 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 5 If the transmission line is symmetric, then the “L matrix” has the equal diagonal, equal off-diagonal property that permits 0-1-2 analysis rather than a-b-c analysis 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 6 Summary of Positive/Negative Sequence Capacitance and Inductance Calculations 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 7 Summary of Positive/Negative Sequence Capacitance and Inductance Calculations 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 8 Summary of Zero Sequence Capacitance and Inductance Calculations meters 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 9 Summary of Zero Sequence Capacitance and Inductance Calculations 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6, March 31, 2015 10 Summary of Zero Sequence Capacitance and Inductance Calculations 6. Transmission Line Models, cont. Prof. Mack Grady, TAMU Relay Conference Tutorial, Topic 6,
