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What is the basic requirement of a transmission line?
Low Cost and minimum outage
Deliver power at specific voltage and frequency with minimum loss
No interference with another frequency signal
All of these
All of these
A transmission line is a critical power system component designed to transport electrical energy from generating stations to load centers efficiently and reliably. To be effective, it must minimize power losses, ensure voltage stability within predefined limits, maintain a constant frequency, and adhere to regulatory standards regarding electromagnetic interference.
A transmission line is a critical power system component designed to transport electrical energy from generating stations to load centers efficiently and reliably. To be effective, it must minimize power losses, ensure voltage stability within predefined limits, maintain a constant frequency, and adhere to regulatory standards regarding electromagnetic interference.
PlossтАЛ=3I2R тАФ Power loss due to line resistance
VdropтАЛтЙИI(Rcos╧Х+Xsin╧Х) тАФ Voltage drop across the line
The transmission line operates based on electromagnetic wave theory and circuit parameters (Resistance R, Inductance L, Conductance G, and Capacitance C). These parameters determine the characteristic impedance Z0тАЛ=G+j╧ЙCR+j╧ЙLтАЛтАЛ. By optimizing these parameters and utilizing high-voltage AC/DC conversion, utilities minimize I2R losses and voltage drop, ensuring stable power delivery to the consumer.
High voltage is used to reduce current for a given power, which drastically minimizes I2R losses.
Inductive interference and capacitive coupling must be controlled via line transposition.
Reliability is measured by the frequency and duration of supply interruptions (SAIDI/SAIFI).
High efficiency over long distances
Voltage level transformation capability via transformers
Significant capital cost for infrastructure
Susceptibility to environmental and weather-related faults
Bulk power transfer from generation sites to sub-stations
Interconnection of regional power grids
Power systems in India typically operate at 50Hz frequency.
Option B covers the primary operational goal, while A and C represent the economic and regulatory requirements of grid management.
D is correct тАФ The design of a transmission line must balance economic efficiency (low cost), technical reliability (low outage), performance (voltage/frequency stability), and regulatory compliance (interference prevention).
Always remember that increasing the transmission voltage reduces the required conductor cross-section for a given power rating, which is the most effective way to minimize both cost and loss.