2006-10-23 01:08:26 · 4 answers · asked by gurna 1 in Science & Mathematics ➔ Physics
because the wires are warmer. Steel expands when warmed
2006-10-23 01:10:14 · answer #1 · answered by amania_r 7 · 0⤊ 0⤋
The main cause of expansion in transmission lines is generally heat generated by the power they are carrying. So days with heavy loads cause the lines to sag.
When this occurs depends where you are in the world.
In the US, peak electricity consumtion now coincides with the hottest days when air conditioners are on their highest setting - and these are also the days when the lines are least able to cool (the air is hot).
In the UK lines are vey unlikely to sag on a summer day.
2006-10-23 08:19:43 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The heat retention causes the expansion of the conductors and will slack, simple expansion and contraction.
2006-10-23 08:14:03 · answer #3 · answered by Anonymous · 0⤊ 0⤋
due to expansion because by the effect of heat
2006-10-23 08:11:01 · answer #4 · answered by kiran51_1 1 · 0⤊ 0⤋