AusLee
Electrical
- Sep 22, 2004
- 259
Hi,
We were asked to demonstrate that our scaffolding will be sufficiently away from a 33kV overhear bare conductor wire.
I don't know which standards you use but in Australia we use AS 7000. That standard states that the insulator swing and conductor blow out can be accurately calculated as per their Appendix R. But they also say that a statistical method can be used and they tabulate this in Table 3.4
That table 3.4 gives for Moderate wind: 0.38m and for High wind 0.18m.
I am not sure why the value for High wind is smaller than that for Moderate win, but the question is: so does this mean that we should get the surveyor to get the projection of the line on the ground, and then add 0.38m, and that'll be the closest the conductor can come close to us, and then we stay clear 4.5m from that point?
I note that at the time the surveyor is taking the measurements, the conductor and insulator could be swinging in the opposite direction, so to be safe we will get the projection of the point of articulation of the insulator on the lateral beam on the pole.
Thanks.
We were asked to demonstrate that our scaffolding will be sufficiently away from a 33kV overhear bare conductor wire.
I don't know which standards you use but in Australia we use AS 7000. That standard states that the insulator swing and conductor blow out can be accurately calculated as per their Appendix R. But they also say that a statistical method can be used and they tabulate this in Table 3.4
That table 3.4 gives for Moderate wind: 0.38m and for High wind 0.18m.
I am not sure why the value for High wind is smaller than that for Moderate win, but the question is: so does this mean that we should get the surveyor to get the projection of the line on the ground, and then add 0.38m, and that'll be the closest the conductor can come close to us, and then we stay clear 4.5m from that point?
I note that at the time the surveyor is taking the measurements, the conductor and insulator could be swinging in the opposite direction, so to be safe we will get the projection of the point of articulation of the insulator on the lateral beam on the pole.
Thanks.