Double-circuit transmission line
- Double-circuit transmission line
A double-circuit transmission line is a transmission line where two circuits are carried on a tower line.
For a three-phase system, this implies that each tower supports and insulates six conductors.
Construction
For a lattice tower structure, these typically have a pyramidal base, then a vertical section, with three levels of two crossarms extending to each side. The insulators are attached to the crossarms.
The most common form has the middle pair of crossarms a bit longer than the other two pairs, although sometimes they're the same size.
A variant that is sometimes used in Europe has two very long crossarms that carry two conductors each, then two normal crossarms above that.
A steel pole structure has a single (very thick) pole with six crossarms attached.
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