J.Brothers Limited

J.Brothers

J.Brothers

Rated voltage 220kV XLPE insulated power cable

This image displays a cross-section model of a 220kV Extra-High Voltage (EHV) Single-Core XLPE Insulated Power Cable. It utilizes a multi-segmented Milliken copper conductor, a specialized design where individual copper strand sections are insulated from one another to minimize skin effect and proximity losses in large-scale electricity transmission.<br><br>This product is mainly used in urban power grid transmission and distribution, urban power grid capacity expansion and renovation, substation construction, and overhead grounding engineering projects. It has the advantages of large transmission capacity, good mechanical performance, and does not occupy ground space.<br>Please share the more technical details on the current-carrying capacity (ampacity) of this specific cross-section, or do you need information on the bonding methods used for its metallic sheath?

Rated voltage 500kV XLPE insulated power cable

At the 500kV threshold, XLPE (Cross-Linked Polyethylene) stands as the global standard for heavy bulk-power infrastructure, completely replacing outdated fluid-filled or paper systems. At the 500kV threshold, XLPE (Cross-Linked Polyethylene) stands as the global standard for heavy bulk-power infrastructure, completely replacing outdated fluid-filled or paper systems. Because these mega-scale utilities are custom-engineered for agencies like EWEC .Kindly share the intended burial depth / routing corridor, the target current rating (Amperes), or whether the project dictates an underground or subsea layout.

Special cables such as umbilical cables & dynamic cables

Dynamic cables and umbilical cables are mainly used for connecting offshore oil and gas platforms with FPSOs, connecting floating wind turbines in offshore wind farms with submarine buried cables, and connecting mother ships with repeaters or underwater robots in harsh underwater environments. It has good mechanical properties, fatigue resistance, seawater corrosion resistance, and can meet the working environment in deep water.<br>If you are developing a technical procurement package, could you share the required number of hydraulic/chemical tubes, the electrical voltage/power throughput (MW), or the specific water depth profile for the deployment.

500kV/535kV/650kV and below multi-core DC submarine cable

Multi-core High-Voltage Direct Current (HVDC) submarine cables rated up to 500kV, 535kV, and 650kV represent the cutting edge of ultra-high capacity subsea electrical transmission. While traditional single-core configurations require burying independent cables along separate paths, multi-core layouts bundle distinct insulated lines into a single heavily armored assembly. This approach radically consolidates marine routing footprints and speeds up installation times.<br>Key Benefits Over Multi-Core SystemsIncreased Transmission Capacity: Single-core cables carry massive bulk power, such as the 1 GW to 2 GW capacities found in modern national grid interconnectors.Deep Sea Capability: Lighter weight per meter permits installation at extreme depths—with specialized designs capable of safe deployment down to 1,500 meters or more.Longer Loading Lengths: Factories can manufacture and load continuous, kilometers-long sections directly onto installation vessels, heavily reducing the need for risky underwater factory joints.

Structural Composition of a Single-Core 500kV Cable

A single-core submarine cable is built in concentric layers to balance intense electrical pressure with harsh undersea mechanics：<br>1. Conductor: Centered large-cross-section copper or aluminum (often ranging from 800 mm² up to 2500 mm²) to deliver high currents efficiently. <br> 2. Insulation Shielding System: Triple-extruded layers consisting of a conductor screen, the primary XLPE/MI insulation, and an outer insulation screen to smooth out electrical fields. <br> 3. Metallic Sheath & Waterproofing: Lead alloy sheath or corrugated copper combined with water-blocking tapes to halt water ingress under heavy deep-sea pressure. <br> 4. Armoring: Single or double layers of heavy-duty galvanized steel wire (or specialized aluminum alloys for AC circuits to minimize induced magnetic losses). <br> 5. Outer Sheath: Tough polypropylene yarn or high-density polyethylene (HDPE) layered with bitumen for maximum abrasion resistance against the seabed. <br><br>If you are evaluating these cables for a specific project, let me know if you need info on HVAC vs. HVDC current ratings, typical installation depths, or cable protection methods.