The main consideration for operating transmission line at high voltage:

Operating transmission lines at high voltage has several advantages and considerations. The main considerations for operating transmission lines at high voltage are as follows:

1. Increasing Efficiency:
- Operating transmission lines at high voltage helps in increasing the overall efficiency of the power system.
- This is because higher voltage levels result in lower current levels, which in turn reduces the I^2R losses in the transmission lines.
- By reducing the losses, more power can be delivered to the load, resulting in a more efficient power transmission system.

2. Reducing Power Loss:
- High voltage transmission lines help in reducing the power losses that occur during the transmission of electricity.
- Power losses in transmission lines occur due to the resistance of the conductors and the reactance of the transmission system.
- By increasing the voltage, the current can be reduced, which in turn reduces the resistive losses in the transmission lines.
- Additionally, high voltage transmission lines are designed with lower reactance, further reducing the losses.
- Overall, operating transmission lines at high voltage helps in minimizing the power losses and improving the efficiency of the power system.

3. Increasing Power Transmission Capability:
- Another important consideration for operating transmission lines at high voltage is to increase the power transmission capability of the system.
- Higher voltage levels allow for the transmission of larger amounts of power over longer distances.
- This is particularly important for long-distance transmission and interconnecting different regions or countries.
- By operating transmission lines at high voltage, utilities can transmit more power and meet the increasing demand without the need for extensive infrastructure upgrades.

Conclusion:
In conclusion, operating transmission lines at high voltage offers various benefits, including increased efficiency, reduced power losses, and increased power transmission capability. These considerations are crucial for maintaining a reliable and efficient power transmission system.

Due to high voltage line loss(i2r) reduced, hence efficiency of the transmission line increased.Due to the less current also required less conduter material.