Ferranti effect is not a problem for Short Transmission lines.

The Ferranti effect refers to the phenomenon where the voltage at the receiving end of a transmission line is higher than the voltage at the sending end, especially during light load conditions. This effect occurs due to the line capacitance and the reactive power flow in the line. It is more pronounced in long transmission lines.

Now let's understand why the Ferranti effect is not a problem for short transmission lines.

1. Definition of Short Transmission Lines:
- Short transmission lines are those lines whose length is less than 250 km.
- These lines have low line inductance and low line capacitance.

2. Capacitive Effect:
- Capacitive effect is more prominent in longer transmission lines due to the larger line capacitance.
- Capacitance causes reactive power flow, which leads to a voltage drop across the line.
- In long transmission lines, the line capacitance can be significant, resulting in a higher voltage drop and thus the Ferranti effect.

3. Absence of Significant Line Capacitance in Short Transmission Lines:
- Short transmission lines have relatively low line capacitance due to their shorter length.
- The capacitance of the line is directly proportional to its length. So, shorter lines have lower capacitance.
- As the line capacitance is low in short transmission lines, the reactive power flow is also low, resulting in a negligible voltage drop.

4. Voltage Regulation:
- Voltage regulation refers to the ability of a transmission line to maintain a constant voltage at the receiving end under varying load conditions.
- The Ferranti effect can cause overvoltage at the receiving end, which affects the voltage regulation of the transmission line.
- Since short transmission lines have low line capacitance and are not prone to the Ferranti effect, they exhibit better voltage regulation.

To summarize, the Ferranti effect is not a problem for short transmission lines because they have low line capacitance due to their shorter length. The low capacitance results in a negligible voltage drop and less reactive power flow, leading to a stable voltage at the receiving end. Therefore, short transmission lines exhibit better voltage regulation and are not affected by the Ferranti effect.