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When Length of transmission line is 100km then it is said to be
Short Transmission Line
Medium Transmission Line
Long Transmission Line
Any of the above
Medium Transmission Line
Transmission lines are classified based on their length and operating voltage because the electrical parameters (Resistance, Inductance, Capacitance, and Conductance) are distributed differently over the length of the line. A line length of 100km falls within the medium transmission line category, which typically ranges from 80km to 250km.
Transmission lines are classified based on their length and operating voltage because the electrical parameters (Resistance, Inductance, Capacitance, and Conductance) are distributed differently over the length of the line. A line length of 100km falls within the medium transmission line category, which typically ranges from 80km to 250km.
L<80┬аkm тАФ Short transmission line
80┬аkmтЙдLтЙд250┬аkm тАФ Medium transmission line
L>250┬аkm тАФ Long transmission line
In short lines (< 80km), shunt capacitance is negligible. In medium lines (80kmтАУ250km), the shunt capacitance is concentrated at specific points (either at one end, both ends, or the middle) to simplify analysis using T or Pi models. In long lines (> 250km), the parameters are treated as uniformly distributed along the entire length requiring hyperbolic function analysis.
Short lines are modeled using a series impedance (R+j╧ЙL) and neglected shunt capacitance.
Medium lines are modeled using nominal-╧А or nominal-T equivalent circuits.
Long lines are analyzed using rigorous transmission line equations involving propagation constant (╬│) and characteristic impedance (ZcтАЛ).
Classification helps in selecting appropriate mathematical models for steady-state analysis.
Simplifies calculation of voltage regulation and efficiency based on line length.
These are empirical ranges and can vary slightly based on the specific power system operating frequency and voltage level.
Modeling assumptions (like lumped parameters for medium lines) introduce slight errors compared to distributed parameter analysis.
Used in power flow studies for grid planning.
Used in protection relay setting coordination.
| Feature | Short Line | Medium Line |
|---|---|---|
Line Classification | Length < 80km | 80km - 250km |
The 100km length is a standard industry threshold placing it firmly in the medium-length category.
Option A is incorrect as it applies to lines shorter than 80km. Option C is incorrect as it applies to lines longer than 250km.
B is correct тАФ Transmission lines ranging from 80km to 250km are categorized as medium transmission lines.
Always remember the classification ranges (80/250 rule) as they are frequently tested in competitive exams for quick identification of the appropriate circuit model.