Answer: transmission lines are typically classified into three categories based on their length and the voltage they carry, which influences how they are modeled and analyzed by engineers:

• Short transmission lines: Typically less than 80 km in length and operating at voltages below 20 kV. For these lines, the effects of capacitance are often considered negligible.

• Medium Transmission Lines: Ranging from 80 km to 240 km, with voltages between 20 kV and 100 kV. The capacitance of the line is considered and is usually modeled as a lumped element.

• Long Transmission Lines: Greater than 240 km in length, with voltages above 100 kV. For these lines, all electrical parameters—resistance, inductance, and capacitance—are considered to be distributed uniformly along the entire length of the line.

We at Ningbo Changshi Electric Power Machinery Manufacturing Limited provide a comprehensive range of tools and equipment to support the construction and maintenance of all these transmission line types.