
How are transmission lines classified by length and voltage?
2025-08-11transmission lines are often classified into three categories based on their length and the voltage they carry, as these factors determine the complexity of the electrical model required for analysis.
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Short transmission lines: Typically less than 80 km (50 miles) long and carrying voltages up to 20 kV. For these lines, the effects of capacitance are negligible, and only resistance and inductance are considered.
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Medium Transmission Lines: Ranging from 80 km to 240 km (50 to 150 miles) with voltages between 20 kV and 100 kV. For these, the effects of capacitance become more significant and must be accounted for in the model.
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Long Transmission Lines: Longer than 240 km (150 miles) and carrying voltages above 100 kV. For these, all electrical parameters—resistance, inductance, and capacitance—are considered to be distributed uniformly along the entire length of the line.
Our product range includes equipment suitable for building and maintaining all three types of transmission lines, ensuring reliable and efficient power delivery regardless of the distance.