What is the approximate line charging contribution of a 230kV transmission line that is 100 miles long?

To determine the approximate line charging contribution of a 230 kV transmission line that is 100 miles long, it's important to understand that the line charging mainly comes from the capacitive effects of long transmission lines, especially at high voltages like 230 kV.

Typically, the line charging capacity can be estimated using a general rule of thumb, which often approximates about 0.3 to 0.4 MVAR per mile for a 230 kV transmission line. By applying this estimation, we can calculate the charging contribution as follows:

For a 100-mile long line, involving a factor of approximately 0.3 to 0.4 MVAR per mile, we have:

• At 0.3 MVAR/mile: 0.3 * 100 = 30 MVAR

• At 0.4 MVAR/mile: 0.4 * 100 = 40 MVAR

This calculation suggests that the line charging could indeed fall around the range of 30 to 40 MVAR or slightly higher depending on additional parameters such as line design and construction. Given that 30 MVAR is a common and reasonable estimate for a straight percentage of a 230 kV transmission line of this