High Dielectric Strength XLPE Cable for Main Substation Connection & Long-Distance Underground Transmission

The thickened, specially formulated cross-linked polyethylene (XLPE) insulation layer perfectly matches the extreme electric fields of 35kV systems. Combined with a high-level double-layer shielding system, the cable permanently maintains extremely low partial discharge levels. This effectively resists electrical treeing and insulation aging caused by long-term high electric fields, voltage fluctuations, and switching operations. Stable dielectric performance prevents insulation breakdown and line interruptions, ensuring the safe operation of regional core trunk lines.

The high-density copper conductor features low DC resistance and excellent heat dissipation. During long-distance transmission, it minimizes power attenuation and heat accumulation. For inter-regional power transmission and large-capacity load supply, it reduces the overall energy consumption of the power system and brings continuous economic benefits to project operators throughout the service life.

The upgraded double-layer steel strip armor structure significantly improves mechanical strength, enabling it to withstand damage commonly encountered in open-air, roadside, and underground laying, including ground subsidence, heavy vehicle traffic, accidental excavation, external impacts, and rodent damage. For projects with large scale and complex terrain, it can significantly reduce the frequency of cable damage and the workload of daily maintenance.

XLPE material maintains stable physical and electrical properties even under long-term continuous operation at 90℃, without softening, deformation, or cracking. The high-strength outer sheath effectively resists UV radiation, drastic temperature changes, and natural weathering. This product is suitable for various climate zones, whether deeply buried underground or partially exposed outdoors.

The multi-layered, tightly assembled structure forms an airtight waterproof barrier, effectively preventing groundwater and humid air from penetrating the cable core. The optimized sheath formulation gives it excellent resistance to salt spray, saline-alkali soils, and corrosive industrial gases. This product can operate reliably in harsh environments such as coastal areas, chemical industrial zones, and humid mountainous regions.

Standard cables inherently possess flame-retardant properties, effectively limiting the spread of flames along the cable path. Customized fire-resistant cables ensure normal power supply for emergency and critical loads during fire accidents. Low-smoke halogen-free cables produce virtually no smoke or toxic gases when burning, fully complying with the stringent fire protection standards for national key infrastructure, enclosed utility tunnels, and public lifeline projects.

All structural dimensions and technical parameters conform to globally unified standards, fully compatible with mainstream 35kV cable terminals, joints, fittings, and fixing accessories worldwide. No specially customized supports are required. Reasonable stiffness and bending performance enable them to adapt to applications such as long-distance cabling, large-radius bends, and concentrated cable tunnel installations, thereby optimizing construction efficiency.

Used for main outgoing lines of urban and rural 35kV main substations, inter-substation connection lines, inter-regional power distribution, and large-scale power grid upgrade and renovation projects. It undertakes the power dispatch and transmission tasks of the entire regional power grid and is a core link in urban and rural power supply.

Used for main outgoing lines of traditional power plants, large wind farms, and centralized photovoltaic power stations. It collects electrical energy from power generation units and transmits it to the upper-level power grid, adapting to long-distance outdoor laying and continuous full-load operation of new energy projects.

Serving as the main 35kV power supply line for integrated chemical industrial parks, coal chemical bases, and large-scale smelting and metallurgical groups, it supplies power to the entire production cluster and high-power main equipment, capable of withstanding harsh workshop environments such as high dust, chemical vapors, and vibration.

Deployed in long-distance mountain tunnels, large cross-sea bridges, integrated railway hubs, and international container ports, the 35kV power distribution system meets the requirements of major transportation infrastructure for ultra-high safety, reliability, and long service life.

Used as the regional main power supply line for large coal mines, open-pit mines, and onshore oilfields. Its strong mechanical strength and environmental adaptability can cope with the rugged terrain, frequent on-site operations, and complex soil conditions in mining and oilfield areas.

Applicable to 35kV main power supply lines in mega-sized urban complexes, central business districts, and large-scale ecological new areas, supporting multi-functional zoned centralized power supply.

Preferred laying methods: direct burial, large cable corridors, buried conduits, and dedicated cable trenches. Long-distance overhead laying is not recommended. Sections crossing roads, railways, rivers, and building foundations should use thickened steel pipes or reinforced concrete culverts for secondary protection. Use professional heavy-duty cable clamps to avoid sheath wear caused by the cable's own weight.

Before design, it is essential to strictly verify that the rated voltage of the power system is 26/35kV. Accurately calculate the total load current and peak inrush current based on the total capacity of the connected equipment. Reserve sufficient current-carrying margin to cope with load increases and transient impacts. Overload operation is strictly prohibited to prevent accelerated aging of the insulation layer.

During cable laying, strictly control the minimum bending radius according to technical requirements. Excessive bending will damage the high-grade shielding layer and insulation structure, and may cause partial discharge. Keep cables away from sharp metal parts and highly corrosive substances. When the ambient temperature is below 0℃, use suspended construction to prevent sheath embrittlement and cracking. When directly buried, lay graded fine sand and protective bricks according to specifications.

In coastal areas, saline-alkali lands, and heavily polluted industrial zones, specialized high-voltage, waterproof, and corrosion-resistant 35kV cable accessories should be selected, and all joints should be fully sealed and waterproofed. All connection points should be located in well-ventilated, dry, and easily accessible areas, and clearly marked for subsequent maintenance.

Before formal energization, a power frequency withstand voltage test and partial discharge detection should be completed, and all indicators must meet the standard requirements. A dedicated long-term inspection mechanism for the 35kV trunk line should be established, with regular insulation resistance tests, partial discharge monitoring, and visual inspections to promptly eliminate potential hazards.

Products are manufactured according to mainstream international standards such as IEC 60840 and IEC 60228, and have passed authoritative third-party testing. Products hold globally recognized certifications such as CE and ISO, and can be used for bidding, delivery, and operation of 35kV medium-voltage projects worldwide.

Raw Material Incoming Inspection: High-purity copper rods, 35kV special cross-linked polyethylene granules, semiconductor materials, and galvanized steel strips undergo rigorous sampling and performance testing before warehousing.

Online Real-Time Monitoring: The fully automated production line monitors insulation thickness, shielding uniformity, cable outer diameter, and winding density throughout the entire production process to ensure product structural consistency.

Comprehensive Finished Product Inspection: 100% sampling testing, including conductor DC resistance, high-voltage power frequency withstand capability, partial discharge, mechanical properties, and thermal aging tests. All non-conforming products are isolated and scrapped.

We provide a complete set of official documents, including factory inspection reports, product certificates of conformity, and detailed test data sheets. All documents fully comply with the requirements for project filing, bid review, on-site acceptance, and export customs clearance.

We employ fixed production formulas and standardized operating procedures. Different batches of products maintain highly consistent electrical and mechanical performance, fully adapting to phased construction, multi-batch delivery, and long-term bulk procurement for large-scale key projects.

A provincial power grid implemented a cross-regional 35kV main line construction project, procuring 42,000 meters of 26/35kV YJV22 type cable for interconnection between multiple main substations. The cable was laid within municipal integrated utility tunnels and direct-buried utility tunnels. After 9 years of operation, all lines operated stably, with partial discharge indicators consistently within standard ranges. This project ensured the power supply balance of the entire regional power grid and passed multiple official power grid acceptance tests.

A large-scale centralized wind farm used this 35kV cable as the main power collection line for the entire wind farm. The cable was laid in the open with shallow burial, exposed to outdoor sunlight and temperature changes for extended periods. Thanks to its excellent anti-aging performance and high insulation performance, the power system operated stably throughout the year, and the project has been operating safely since its commissioning.

We use specialized raw materials designed specifically for 35kV high-voltage operating environments. A rigorous quality control system throughout the entire process ensures that every cable possesses excellent overall performance. Reliable products reduce the risk of line failures and subsequent maintenance costs, providing a solid safety guarantee for critical trunk line projects.

Based on standard products, we support customized production for flame retardant ratings, fire resistance ratings, low-smoke halogen-free specifications, termite protection, sheath color, and fixed lengths. Simultaneously, we provide a complete set of 35kV cable terminals, connectors, and installation accessories, enabling one-stop procurement and simplifying project coordination.

Our experienced medium- and high-voltage electrical engineers provide free dedicated services, including cable model selection, load current calculation, laying scheme optimization, and accessory matching. We can compile the specific technical information and certification documents required for bidding projects to help clients optimize design solutions and save time on technical research.

We maintain ample inventory of 35kV cables in mainstream cross-section specifications to support large spot orders and urgent project needs. These cables can be mixed with other cable products to improve container utilization and control cross-border logistics costs. For long-term cooperative clients, we have framework agreements to ensure regular bulk deliveries and stable supply.

We are familiar with international trade rules and customs requirements in different regions around the world. We can provide a complete set of certification documents, test reports, commercial invoices, and packing lists required for export, ensuring smooth customs clearance and timely delivery of goods to their destination.

Each order comes with a detailed English installation guide and operation manual. For large-scale 35kV key projects, we provide free remote technical guidance during construction, wiring, and testing. Our service team responds quickly to product and technical inquiries, ensuring the smooth progress of the entire project.