Question

The loadability of short transmission lines (less than$\mathbf{25}\mathbf{km}$, represented by including only series resistance and reactance) is determined by __________; that of medium lines (less than$\mathbf{250}\mathbf{km}$, represented by nominal$\mathbf{\pi }$circuit) is determined by __________; and that of long lines (more than$\mathbf{250}\mathbf{km}$, represented by equivalent$\mathbf{\pi }$circuit) is determined by

__________.

Short answer

The correct answer is thermal limit, voltage drop limit and the steady state stability limit.

Step-by-step solution

Determine the line loading limits. 

There are three major line loading limits.

(a) The thermal limit

(b) The voltage drop limit

(c) The steady state stability limit

Determine the answer

The loadability of short transmission lines (less than$25\mathrm{km}$, representedby including only series resistance and reactance) is determined by the thermal limit.

For medium lines (less than$25\mathrm{km}$, represented by nominal$\mathrm{\pi }$circuit), the loadability is determined byThe voltage drop limit.

For long lines (more than$25\mathrm{km}$, represented by equivalent$\mathrm{\pi }$circuit) is determined byThe steady state stability limit.

Therefore, the loadability limits are obtained.