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What is the value of shunt capacitance of medium transmission line?
Very high
Medium
Zero
Very low
Medium
In power systems, transmission lines are categorized based on length. For medium transmission lines (typically 80 km to 200 km), the shunt capacitance is significant enough that it cannot be ignored, unlike in short transmission lines where it is negligible.
In power systems, transmission lines are categorized based on length. For medium transmission lines (typically 80 km to 200 km), the shunt capacitance is significant enough that it cannot be ignored, unlike in short transmission lines where it is negligible.
ICтАЛ=j╧ЙCVphтАЛ тАФ Current flowing through the shunt capacitive susceptance
Y=j╧ЙC тАФ Shunt admittance per unit length
The shunt capacitance arises due to the potential difference between the transmission line conductors and the ground, acting as the plates of a capacitor. In medium lines, this effect is represented using lumped parameters, such as the ╧А-model or T-model, to accurately calculate voltage drop and efficiency.
Short lines (<80 km): Capacitance is neglected.
Medium lines (80-200 km): Capacitance is lumped and considered.
Long lines (>200 km): Capacitance is distributed over the entire length.
Shunt capacitance affects the Ferranti effect, especially at light loads.
Improved voltage regulation calculations
Better accuracy for power flow analysis
Increases mathematical complexity compared to short-line approximation
Requires iterative methods for precise long-line calculation
Load flow studies in regional grids
Power system stability analysis
In medium transmission lines, models like nominal ╧А or nominal T are preferred for analysis.
Option C (Zero) is incorrect as it applies only to short transmission line models.
B is correct тАФ Medium transmission lines have a significant shunt capacitance that must be accounted for in their performance models.
Always remember: Short lines use lumped resistance/inductance, medium lines add lumped shunt capacitance, and long lines require the distributed parameter model (ABCD constants).