Professional Answer: The sag of a transmission line is not static; it is a dynamic measurement influenced by several key factors:

1. Temperature: This is the most significant factor. As the temperature rises, the conductor material (typically aluminum or a steel-reinforced aluminum composite) expands, increasing its length and causing the sag to increase. Conversely, a drop in temperature causes the conductor to contract, decreasing the sag and increasing the tension.

2. Span Length: The distance between two support structures. Sag is directly proportional to the square of the span length. Longer spans will naturally have more sag than shorter ones for the same tension.

3. Conductor Weight: The weight of the conductor itself, along with any additional loads like ice or snow accumulation, will increase the sag.

4. Wind Pressure: High winds apply a lateral force to the conductors, which can cause them to swing and increase the sag in an inclined direction, potentially reducing the clearance between phases or to other objects.

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