Correct option is D
ACSR (Aluminum Conductor Steel Reinforced) is widely used in overhead power lines due to its desirable properties. Let's evaluate the characteristics listed:
Low maintenance: ACSR conductors generally require low maintenance due to their corrosion resistance and durability.
High mechanical strength: ACSR conductors have high mechanical strength due to the steel core which provides additional support and allows for longer spans between towers.
Low cost: ACSR conductors are cost-effective compared to other types of conductors, making them a popular choice for power transmission.
High corona loss: This is not a characteristic of ACSR. In fact, one of the drawbacks of ACSR is its susceptibility to high corona loss, which is undesirable as it leads to power loss and noise.
Therefore, the correct answer is (d) High corona loss.
