Ask the difference between tension setting-out and tension-free setting-out in line construction.

1, tension pay-off: During the whole stringing process, keep the unfolded conductor at a certain tension and leave the ground in an overhead state.

2. Tension-free pay-off: the erection construction method in which the conductor does not maintain a certain tension during the whole stringing process.

Second, the requirements are different.

1, tension pay-off: tension pay-off must be adopted for power line projects above10kv, and optical cables or wires are not allowed to mop the floor during pay-off.

2. Tension-free pay-off: Tension-free pay-off can be used for power line projects below 1 10KV.

Third, the way is different.

1. Tension setting-out: according to the positioning piles (at least 4 piles) of the planning department and the construction plan of the ground floor of the building, set out the axis positioning piles.

2. Tension-free setting-out: Axis positioning piles and external axis reference lines are used for construction setting-out.

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