3 ms·
It's medium voltage lines which are up to tens of kilometers long, not high voltage hundreds of km. The spans between pylons are also much shorter than HV, so a
by rini17 6y ago
It's medium voltage lines which are up to tens of kilometers long, not high voltage hundreds of km. The spans between pylons are also much shorter than HV, so adding slack to allow for CTE mismatch seems doable without excessive abrasion.
On the illustration the winding is very sparse, it definitely does not look like running into minimal bend radius problem or adding much length.
- mmmBacon 6y agoI’m not sure what the diameter is of these cables but I found a data sheet that shows MV (33kV) cables are <50mm in diameter. If that’s true then, the bend radius is <25mm. If the winding is sparse, let’s say 1 turn every 1m on a 38mm diameter cable, then the amount of length added will be ~1% of the total linear length (neglecting the cable sag). So the amount of added length due to winding it will negligible. At 1000 bends per km, if we assume loss is 0.001dB per bend, then we’d add 1dB per km. http://www.prioritywire.com/brochures/Medium%20Voltage%20Power%20Cable.pdf http://www.prioritywire.com/brochures/Medium%20Voltage%20Pow...
- agseward 6y agoWouldn't the bend radius only be <25mm if you were winding very densely? At sparse winding, you aren't actually bending it much.