EHV cable · Georgia
We buy 500 kV cable and EHV accessory packages
Five hundred kilovolt cable is not a stocked material anywhere. It is a factory-engineered assembly built for one route, and when a length becomes surplus it is reviewed on records, terminations and transport rather than on footage alone.
- Engineered assemblies
- Type test records
- Oversize loads
01Overview
What this page covers
Georgia's 500 kV system is overhead. Cable at this voltage appears only where a line has to pass below something that cannot be crossed in the air, or where a generating station connects to a nearby substation. The lengths are short, the assemblies are large, and the engineering effort behind them is out of proportion to the meters involved.
The consequence for a seller is that a 500 kV lot is almost always one of three things: reels from a project that was canceled before installation, a factory test or qualification length, or cable removed from a route that has been rebuilt. Each is reviewed differently, and none of them behaves like a surplus reel of 15 kV cable.
02Specification
What an EHV lot contains
- Voltage class
- 500 kV
- Insulation
- XLPE, or paper insulation in a fluid-filled system
- Conductor
- 3,000 kcmil to 4,000 kcmil, segmental, copper or aluminum
- Sheath
- Welded corrugated aluminum, or a lead sheath inside a steel pipe
- Reels
- 120 in. to 144 in.; lengths set by the route, not by a catalog
- Accessories
- Factory terminations, joints, GIS or SF6 interfaces, limiters
- Records
- Type test and prequalification reports plus routine works tests
- Condition
- Never installed, test length, service-aged, cut-out section
Ask for the type test report, not just the routine test. At 500 kV the qualification record is what establishes that the design was ever proven.
03Cable and accessories we buy
Cable and accessories we buy
Fluid-filled 500 kV systems
Most long 500 kV cable in service is fluid-filled rather than extruded: paper insulation in a lead sheath, inside a steel pipe or a self-contained enclosure, with oil or dielectric fluid at pressure. The pipe, the fluid and the potheads are all part of the asset.
Extruded EHV cable and qualification lengths
XLPE cable at this class is recent enough that lengths in circulation are often qualification or test samples. They may be short, they may have cut-back ends, and they are reviewed on the documentation that came with the test program.
Factory terminations and GIS interfaces
EHV terminations are built by the cable manufacturer to fit one cable design. They are shipped in crates with alignment jigs and instructions, and a crate that has been opened and stored badly is worth the metal in its fittings.
Bonding, limiting and monitoring hardware
Sheath voltage limiters, link boxes, grounding kits and distributed temperature sensing equipment. On an EHV route these are designed with the cable, and separating them reduces what either part is worth.
04Evaluation
How a 500 kV lot is reviewed
Documentation carries the review. A type test report, a routine test record, a route drawing and a termination schedule together establish what the material is and whether anyone can install it. Without them, a 500 kV length is difficult to place, because no utility will energise cable whose provenance is unknown.
Condition comes second and is mostly about handling damage. At this diameter the insulation is thick and the sheath is stiff, so the failure modes are creases in the sheath, ovality from a bad saddle, and water in the ends. Look at the drum, the bearing stands and the lagging before looking at the cable.
Then the practical question of who could use it. The list is short: a utility with an EHV cable route, an OEM supporting its own design, or a project that already owns matching accessories. That reality is worth stating plainly when a lot is described, because it sets the timetable for a sale.
Three things separate this class from everything below it. Transport: a 144 in. drum is an oversize load that needs permits, a route survey and a crane at both ends. Provenance: no ordinary field set can prove this cable, so any test is a specialist operation by the owner of the equipment, and an untested length cannot be energized. Handling: the ends stay sealed, because opening one in a yard exposes insulation that only a factory environment restores.
05Seller terms
Before you sell: how it works
Four things a seller should be able to pin down before a truck is booked.
Verification
Footage is checked against the reel tag, the sequential marks on the jacket, the wrap count against the barrel, or a published weight per 1,000 ft — whichever the reel actually supports.
Payment
Payment method and timing are agreed in writing for the specific lot before anything is loaded or moved. No verbal number is treated as an agreement.
Paperwork
A bill of sale for the lot, and for utility material the owning utility’s release reference. Neither is optional and neither is created after the fact.
Freight
Collection is arranged as part of the terms. Say what can lift the reels and whether a 53-foot trailer can reach them, and the pickup is planned around that.
Sending a reel list and photographs costs nothing. A review is not a purchase, and nothing is bought, moved or scheduled until written lot terms are agreed for that material. Request a pickup when the lot is ready.
07Questions
500 kV cable questions
Is 500 kV cable ever surplus in ordinary utility stock?
No. It is bought for a specific route or station tie, so any surplus comes from a canceled project, a design change or a rebuild rather than from stock rotation.
What is a qualification length?
A cable made to prove a design before it is offered for service, tested to a published program. It is genuine cable with genuine records, and it is sometimes the only 500 kV material that reaches the secondary market.
Does the termination have to come with the cable?
For practical purposes yes. An EHV termination is built to one cable design, so a termination from another manufacturer will not fit without engineering work.
How is an EHV reel transported?
On a lowboy or a specialized trailer, with permits, an escort where required, and a crane at both ends. The drum is usually moved on its own shipping cradle.
Send the type test report and the crate list
Records, terminations and drum dimensions describe an EHV lot. Without them the material is reviewed as tested cable of uncertain origin.