Client: AMS / Stratkraft
Outline Project Description
Detailed design for the replacement of 2No existing 33kV and 1No 11kV circuits, and associated fibre optic cables between existing OHL terminations and Rheidol substation. Works also include diversion of existing overhead 11kV circuit.
Horizontal Directional Drill Underground Cable
Cable replacement design is by HDD from Rheidol Power Station to the crest
of the hill some 200m plus rise in level. There are to be 2Nr shots each containing 4Nr 125 SDR 11 PE
ducts, 1Nr 90 SDR 11 PE duct, 1Nr 160 SDR 11 PE duct. . For each shot three of the 125mm ducts are to contain three single core 33kV XLPE cables with the forth being spare. The 90mm duct is for the 48 fibre optic cables.
Only one of the shots will utilise the 160mm duct for an 11kV triplex XLPE cable with the second shot
being retained as a spare duct.
EDES Involvement: Cables
Design/works of cable system for the following:
2Nr 33kV cables
- Cable construction
- Cable accessories
- Circuit Rating
- Cable pulling
- Clamping and Cleating
- Earth bonding
2Nr 48 Fibre Optic Cables
- Cable construction
- Cable accessories
- Cable pulling
1Nr 11kV cable
- Cable construction
- Cable accessories
- Circuit Rating
- Cable pulling
- Clamping and Cleating
- Earth bonding
Ducting
- Ducting design for new 33kV route to Pole DY 1
- Ducting design for new 33kV route to Pole DZ 1
- Ducting design for new 11kV route to new terminal pole
- Ducting design for new fibre optic cable to Pole DY 1
- Ducting design for new fibre optic cable to Pole DZ 1
EDES Involvement: Overhead Lines
Design/works of Overhead lines for the following:
33kV Terminal Pole DY 1 – Design
- Pole steelwork for new cable system (existing ‘H’ pole to be retained)
- Cable cleating
- Cable termination
- Link box
- Surge arrestors
- Fibre optic cable jointing to existing ADSS and support frame
33kV Terminal Pole DZ 1 – Design
- Pole steelwork for new cable system (existing ‘H’ pole to be retained)
- Cable cleating
- Cable termination
- Link box
- Surge arrestors
- Fibre optic cable jointing to existing ADSS and support frame
11kV Pole – Design
- Survey overhead line
- Design new terminal pole and assumed single pole for diversion and dismantling of 2Nr span
- Cable cleating
- Cable termination
- Link box
- Surge arrestors
EDES Involvement: Plant
Design/works of Plants for the following:
33kV Transformer Bay 1&2 – Design
- Survey of transformer bay, busbars, multicore routes and existing steelwork
- Steelwork design for new cable system, supports for bars, post insulators, cleats, cable terminations
- Steelwork design for surge arrestors
- Steelwork design for slip-over CT’s
- Cable cleating
- Cable termination
- Link box
- Surge arrestors
- Slip-over CT’s design
- Protection settings review
11kV Switch House
- Survey of existing basement
- Design of support bracketry and cable cleating
- Cable termination