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Short Medium Long Transmission Line Video Lecture | Power Systems - Electrical Engineering (EE)

FAQs on Short Medium Long Transmission Line Video Lecture - Power Systems - Electrical Engineering (EE)

1. What is the difference between short, medium, and long transmission lines?
Ans. Short transmission lines are typically less than 250 kilometers in length and can be represented using a simple series impedance model. Medium transmission lines range from 250 to 500 kilometers, requiring a more complex model that accounts for both resistance and reactance as well as line capacitance. Long transmission lines exceed 500 kilometers and need a comprehensive model that considers all parameters, including the effects of line charging and the distributed nature of capacitance.
2. How do you calculate the voltage drop in a short transmission line?
Ans. The voltage drop in a short transmission line can be calculated using the formula: \[ V_{drop} = I \times Z \] where \( I \) is the load current and \( Z \) is the series impedance of the transmission line. This formula assumes negligible capacitance effects due to the short length of the line.
3. What are the key parameters that affect medium transmission lines?
Ans. The key parameters that affect medium transmission lines include the resistance (R), inductance (L), and capacitance (C) per unit length of the line. These parameters influence the line's performance, including voltage regulation, power losses, and the overall efficiency of power transmission.
4. Why is the model for long transmission lines more complex than that for short lines?
Ans. The model for long transmission lines is more complex because it must account for the distributed nature of the line's parameters, including resistance, inductance, and capacitance, which affect the voltage and current at various points along the line. Additionally, long lines experience significant effects from phase shifts, voltage drops, and reactive power, necessitating the use of more advanced mathematical models like the ABCD parameters.
5. What are the common applications of short, medium, and long transmission lines?
Ans. Short transmission lines are commonly used for local distribution networks, such as connecting substations to nearby loads. Medium transmission lines are used for regional power distribution, connecting substations over moderate distances. Long transmission lines are essential for transmitting electricity over long distances, such as from power plants to urban centers, facilitating efficient bulk power transfer across regions.
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