Termination arrangement for an overhead electrical cable
A termination arrangement for securing an overhead electrical cable to a dead-end structure such as a dead-end tower. The termination arrangement includes a compression sheath structure that is configured to be disposed over the individual composite rods of the strength member. The compression sheath structure mitigates damage to the strength member that may occur when an outer metallic sleeve is compressed around the conductive strands and the conductive strands are compressed against the strength member. The arrangement is particularly useful for securing overhead electrical cables having a composite strength member to a dead-end structure.
1. A termination arrangement securing an overhead electrical cable to a dead-end structure, the overhead electrical cable having a composite strength member comprising a plurality of individual fiber-reinforced composite rods that are operatively combined to form the composite strength member and having conductive strands surrounding the composite strength member, the termination arrangement comprising:
a connector anchoring the termination arrangement to the dead-end structure;
an outer metallic sleeve surrounding the proximal end of the overhead electrical cable, the outer metallic sleeve having a compressed portion disposed over the proximal end of the overhead electrical cable; and
a compression sheath structure comprising a plurality of aluminum cylindrical tubes, wherein each of the plurality of aluminum cylindrical tubes is disposed over a different fiber-reinforced composite rod to create a ductile barrier between each of the fiber-reinforced composite rods along a length of the conductive strands under the compressed portion, wherein the compression sheath structure does not extend substantially beyond the compressed portion of a distal end of the termination arrangement.
2. The termination arrangement recited in claim 1 , wherein the individual fiber-reinforced composite rods comprise substantially continuous reinforcing fibers disposed within a binding matrix that extend along a length of the fiber-reinforced composite rods.
3. The termination arrangement recited in claim 2 , wherein the binding matrix is a polymeric matrix.
4. The termination arrangement recited in claim 3 , wherein the substantially continuous reinforcing fibers comprise carbon fibers.
5. The termination arrangement recited in claim 1 , wherein the conductive strands comprise aluminum strands.
6. The termination arrangement recited in claim 5 , wherein the conductive strands comprise hardened aluminum strands.
7. The termination arrangement recited in claim 1 , wherein the plurality of individual fiber-reinforced composite rods comprises a central fiber-reinforced composite rod and two or more outer fiber-reinforced composite rods surrounding the central rod, and wherein two or more of the plurality of aluminum cylindrical tubes are each disposed over an end of an individual outer fiber-reinforced composite rod of the two or more outer fiber-reinforced composite rods.
8. The termination arrangement recited in claim 7 , wherein one of the plurality of aluminum cylindrical tubes is disposed over an end of the central fiber-reinforced composite rod.
9. The termination arrangement recited in claim 1 , wherein the plurality of aluminum cylindrical tubes are fabricated from an annealed aluminum.
10. The termination arrangement recited in claim 1 , wherein each aluminum cylindrical tube of the plurality of aluminum cylindrical tubes has a thickness of at least about 2 mm and not greater than about 10 mm.
11. The termination arrangement recited in claim 1 , wherein each aluminum cylindrical tube of the plurality of aluminum cylindrical tubes has a length of at least about 300 mm and not greater than about one meter.
12. The termination arrangement recited in claim 1 , wherein the conductive strands are fabricated from a hardened aluminum alloy.
13. The termination arrangement recited in claim 1 , wherein each aluminum cylindrical tube of the plurality of aluminum cylindrical tubes has an inner diameter that is approximately the same as the outer diameter of the individual fiber-reinforced composite rods.
14. The termination arrangement recited in claim 1 , wherein each aluminum cylindrical tube of the plurality of aluminum cylindrical tubes comprises a longitudinal slot along the cylindrical tube.
15. The termination arrangement recited in claim 1 , wherein the conductive strands comprise hardened aluminum strands.
16. A termination arrangement securing an overhead electrical cable to a dead-end structure, the overhead electrical cable having a composite strength member comprising a plurality of individual fiber-reinforced composite rods that are operatively combined to form the composite strength member and having conductive strands surrounding the composite strength member, the termination arrangement comprising:
a connector anchoring the termination arrangement to the dead-end structure;
an outer metallic sleeve surrounding the proximal end of the overhead electrical cable, the outer metallic sleeve having a compressed portion disposed over the proximal end of the overhead electrical cable; and
a compression sheath structure comprising a plurality of aluminum cylindrical tubes, wherein each of the plurality of aluminum cylindrical tubes is disposed over a different fiber-reinforced composite rod to create a ductile barrier between each fiber-reinforced composite rod of the plurality of fiber-reinforced composite rods along at least a length of the conductive strands under the compressed portion of the outer metallic sleeve,
wherein each aluminum cylindrical tube of the plurality of aluminum cylindrical tubes has an inner diameter that is approximately the same as an outer diameter of the individual fiber-reinforced composite rods,
wherein the compression sheath structure does not extend substantially beyond the compressed portion of a distal end of the termination arrangement, and
wherein the conductive strands comprise hardened aluminum strands.