35kV YJV22 for Substation Inlet, Large-Scale Renewable Energy Grid Connection &

The 35kV YJV22 is a medium-to-high voltage power cable with steel-tape armor, designed for fixed installation in 35kV three-phase power transmission and distribution systems. It is available in two standard rated insulation voltage classes—21/35kV and 26/35kV—and comes in single-core and three-core configurations with conductor cross-sections ranging from 16mm² to 630mm² to meet diverse current-carrying capacity requirements.

Its comprehensive construction comprises: a compacted high-purity copper conductor → a conductor semi-conductive shielding layer → a thickened, tree-resistant XLPE primary insulation layer → an insulation semi-conductive shielding layer → a helically wrapped copper tape metallic shield → a wrapping tape → a PVC bedding layer → a double-layer contra-helically wound galvanized steel tape armor → and a weather-resistant, anti-aging PVC outer sheath.

Unlike 10kV/15kV medium-voltage cables, 35kV-class cables are subjected to extremely high electric field stress; consequently, the use of a "dual full-shielding structure" and "100% finished-product partial discharge testing" are essential core processes to eliminate internal insulation defects and meet rigorous grid-connection approval standards. Its integrated double-steel-tape armor effectively withstands deep soil pressure, excavation impacts, rock punctures, and rodent damage, thereby eliminating the need for costly, heavy-duty protective conduits in direct-burial projects and achieving an optimal balance between long-term insulation stability, mechanical durability, and total project lifecycle cost control.

This product has been standardized and is widely recognized by global power design institutes, national grid operators, and international EPC contractors. As a mainstream underground backbone cable for 35kV high-capacity power transmission infrastructure, it is extensively used worldwide in municipal grid upgrades, large-scale renewable energy grid integration, centralized power supply for heavy industry, and high-voltage power layouts for major transportation infrastructure.

21/35kV (U₀/U=21/35kV, Um=40.5kV): Suitable for 35kV distribution networks with unearthed or arc-suppression coil-grounded (resonant grounded) neutral points; widely used in conventional domestic municipal and industrial distribution networks.

26/35kV (U₀/U=26/35kV, Um=40.5kV): Suitable for 35kV power grids with effectively grounded (directly grounded) neutral points; offers a higher insulation safety margin and is the preferred choice for international projects, large-scale renewable energy power plants, and high-reliability backbone grid projects.

• YJ: Cross-linked polyethylene (XLPE) insulation, specifically designed for 35kV high-field-strength operating conditions; features extremely high dielectric strength and offers superior resistance to electrical tree propagation, water tree aging, and partial discharge initiation under sustained high-voltage stress.
• V: PVC inner bedding/separation sheath, serving to prevent mechanical abrasion and electrochemical corrosion between the steel tape armor and the internal insulated core assembly.
• 22: Double-layer overlapping galvanized steel tape armor plus an outer PVC protective sheath; forms a specialized mechanical barrier capable of withstanding deep soil pressure, impacts from heavy excavation machinery, sharp rock punctures, and rodent damage, making it suitable for harsh deep-burial environments.
• 21/35kV / 26/35kV: Two mainstream rated insulation voltage levels, corresponding to different power grid grounding configurations.
• Single-core / Three-core: Structural configuration; three-core designs are suitable for symmetrical three-phase balanced power transmission, while single-core designs are suited for high-current, heavy-load trunk line applications.

• GB/T 12706.1–4:2020 – National standard for extruded insulation power cables with rated voltages from 0.6/1 kV to 26/35 kV
• IEC 60840 – International standard for extruded insulation power cables for medium and high voltage (maximum system voltage Um up to 36 kV)
• IEC 60228 – Standard for the construction of Class 2 compacted stranded copper conductors
• GB/T 19666 – Flame-retardant grade specifications; supports customization for ZA/ZB/ZC flame-retardant ratings and LSZH (Low Smoke Zero Halogen) upgrades
• Mandatory factory core tests for 35 kV products: Partial discharge ≤10 pC at a test voltage of 1.73U₀; fully compliant with grid entry inspection and acceptance criteria
• Comprehensive certification system: Includes ISO9001 quality management system certification, CCC mandatory certification, CE certification, CB certification, full-item type test reports, partial discharge test records, raw material inspection documentation, and third-party independent test certificates; fully meets requirements for international tendering, technical reviews, and project completion acceptance audits

• Class 2 Compacted High-Purity Electrolytic Copper Conductor

  Precision compacting and stranding processes optimize conductor roundness and density, significantly reducing DC resistance, heat generation, and active power loss during long-distance, heavy-load 35kV power transmission. The conductor exhibits minimal creep deformation even after decades of terminal crimping stress, ensuring stable contact resistance throughout a 30-year service life and eliminating the long-term overheating risks often associated with aluminum conductor solutions. The smooth, uniform conductor surface ensures a precise fit with specialized heavy-duty 35kV cable terminals and complete termination assemblies, delivering consistent and reliable crimping performance.

• Semi-conductive Conductor Shielding Layer (A critical structural component for the 35kV voltage class)

  A uniform semi-conductive layer, formed via an extrusion process, adheres tightly to the outer surface of the conductor. It effectively homogenizes the electric field distribution around the conductor, eliminates points of localized high electric field concentration, and suppresses the onset of partial discharge. This is an indispensable structural element for ensuring the cable meets dielectric performance standards and passes grid-entry testing.

• Thickened XLPE Main Insulation Layer with Real-time Online Eccentricity Monitoring

  The insulation thickness is precisely designed and calculated to withstand the full electric field stress associated with 35kV operation. The production line is equipped with real-time online monitoring systems for insulation thickness and eccentricity, and every finished cable undergoes 100% offline partial discharge testing to completely eliminate internal air gaps, microscopic impurities, and potential insulation defects. By utilizing premium-grade medium-voltage XLPE material, the cable effectively inhibits electrical tree propagation, water tree aging, and insulation breakdown—phenomena often caused by long-term burial in moist, acidic, or alkaline corrosive soils—thereby ensuring stable dielectric performance under conditions of cyclical peak load fluctuations and transient lightning surges.

• Insulation semi-conductive shielding layer + helically wrapped copper tape metallic shielding layer

  The outer semi-conductive layer works in tandem with the inner shielding layer to ensure a uniform electric field distribution. The helically wrapped copper tape metallic shielding layer conducts induced currents and short-circuit fault currents, meeting the shielding and grounding design requirements for 35kV systems; it suppresses outward electromagnetic interference radiation and fully complies with grid system grounding specifications.

• Non-hygroscopic polypropylene (PP) filler strips + overall binding tape (three-core structures only)

  These fill the interstices between large-cross-section cores, maintaining the overall round geometry of large-diameter cables. During cable pulling, bending, and installation, they alleviate internal compressive and shear friction, preventing abrasion of the insulation surface; additionally, they retard moisture ingress in environments such as semi-enclosed cable trenches or deep underground installations.

• Extruded PVC Inner Separator Sheath

  This layer forms a continuous, intact physical barrier between the steel tape armor and the insulated core assembly. It prevents abrasion damage to the sheath during cable laying and bending operations and inhibits electrochemical corrosion between the galvanized steel tape and the internal metal and polymer components when the cable is laid in chemically active, contaminated soil.

• Double-Layer Overlapping Galvanized Steel Tape Armor (Primary Mechanical Protection Layer)

  Utilizing a structure of two layers of steel tape wrapped in opposite directions with overlap, this armor withstands the extreme lateral soil pressure encountered during deep-burial installation of 35kV backbone cables. It effectively resists massive lateral soil-squeezing forces, impacts from accidental large-scale excavation, punctures by sharp rocks, and damage from rodent gnawing. This structural design allows the 35kV main feeder cable to be buried directly without the need for additional large-diameter, heavy-duty protective conduit.

• Weather-resistant PVC outer sheath

  The outer sheath provides comprehensive external protection against soil chemical corrosion, UV degradation, ozone aging, and long-term moisture ingress; suitable for overhead, cable trench, and tunnel installations, as well as complex underground operating conditions, ensuring the cable maintains structural integrity throughout its designed service life.

• Rated Voltage Class

  U₀/U: 21/35kV, 26/35kV (AC 50Hz); maximum system operating voltage Um = 40.5kV; specifically designed for installation on main lines of 35kV three-phase medium-to-high voltage distribution networks.

• Conductor Configuration Options

  Single-core: 16mm² ~ 630mm²; Class 2 compacted stranded copper conductor.

  Three-core: 16mm² ~ 400mm²; Class 2 compacted stranded copper conductor; features a symmetrical three-core balanced layout, suitable for three-phase power transmission.

• Thermal Performance Specifications

  Maximum permissible continuous operating temperature of the conductor: 90°C

  Maximum short-circuit withstand temperature of the conductor (duration ≤ 5 seconds): 250°C

  Minimum permissible ambient temperature for installation: 0°C for standard versions; low-temperature custom versions support installation in harsh environments down to -20°C

  Rated design service life under proper installation and normal operating conditions: ≥ 30 years

• Mandatory installation bending radius requirements (critical inspection points for high-voltage cable installation; D = cable outer diameter)

  Minimum bending radius for 35kV YJV22 three-core cable: ≥ 15 × D

  Minimum bending radius for 35kV YJV22 single-core cable: ≥ 20 × D

• Structural characteristics note: The armor layer withstands radial pressure and impact loads but cannot withstand significant axial tensile force; this 35kV high-voltage backbone cable is not recommended for long-span overhead suspension or vertical installation with significant elevation differences (if tensile strength is required, please select the YJV32 steel-wire armored model).
• Electrical and Installation Characteristics

  The continuous current-carrying capacity meets the design requirements for full-range power transmission on 35kV primary feeder lines. Low-resistance copper conductors effectively minimize voltage drop and active power loss in medium-to-long-distance substation feeder trunk lines, preventing excessive voltage deviations that could compromise the stable operation of downstream high-capacity distribution equipment and transformer banks.

• Dual full-shielding system combined with 100% partial discharge testing ensures qualification for official 35kV grid connection.

  The combination of internal and external semi-conductive shielding layers with a continuous copper tape metallic shield optimizes overall electric field uniformity. Every finished cable undergoes 100% partial discharge testing—with discharge levels strictly controlled below 10pC—eliminating risks associated with long-term insulation degradation and fully satisfying the rigorous grid-connection standards set by power utilities and third-party design review bodies for critical 35kV grid-connected trunk projects.

• A comprehensive standardization framework eliminates tedious, repetitive load calculation tasks.

  The product line covers a full range of cross-sections from 16mm² to 630mm², supported by field-proven ampacity tables, long-distance voltage drop data, matching 35kV heavy-duty termination accessories, and unified installation standards. Designers are spared from repetitive iterative calculations and design validations regarding conductor cross-sections; this accelerates drawing reviews, technical clarifications during tendering, and project approvals, while simultaneously reducing the risks of design changes and calculation errors.

• An integrated double-steel-tape armored design enables cost-effective direct-burial installation for 35kV backbone lines.

  The built-in high-strength mechanical protection layer eliminates the need for large, heavy-duty conduits in underground main feeder designs. This reduces the scope of civil works—such as trench excavation depth, large-diameter pipe procurement, and backfilling—simplifies construction layouts, and shortens the overall construction schedule for urban backbone grid upgrades and large-scale renewable energy grid-connection projects.

• Copper conductors eliminate the risk of long-term joint overheating in critical 35kV grid backbone lines.

  As core components of the power grid's transmission network, 35kV backbone feeders must withstand sustained, sharply fluctuating peak loads. The inherent creep resistance of copper conductors prevents terminal loosening and thermal runaway—issues common with aluminum cables—thereby significantly reducing the frequency of inspections, maintenance, and emergency repairs required after the lines are commissioned.

• Customizable flame-retardant and low-smoke zero-halogen (LSZH) specifications comply with international fire safety standards for public infrastructure.

  Customization options—including ZA/ZB/ZC-grade flame retardancy and WDZ-grade LSZH upgrades—are available across the entire conductor cross-section range. These solutions meet regulatory requirements for fire safety certification in applications such as underground utility tunnels, long highway tunnels, incoming mains for basement distribution rooms, and high-voltage distribution systems in large public hubs.

• Mature, large-scale production specifications eliminate the price premiums associated with custom manufacturing.

  This mainstream 35kV high-voltage backbone feeder series benefits from continuous, large-scale production. Compared to non-standard custom cross-sections, it offers stable unit pricing and predictable lead times, enabling procurement teams to accurately lock in budget quotes during the bidding phase and effectively mitigate risks associated with raw material price fluctuations.

• Direct-burial installation reduces overall civil engineering costs.

  This approach eliminates the need to procure, transport, and install large-diameter, heavy-duty conduits, thereby reducing the civil engineering component of the total project cost and allowing EPC contractors to maintain healthier profit margins during the bidding process.

• Low long-term O&M costs offset the initial investment in copper materials.

  Although the initial unit price is higher than that of equivalent YJLV22 aluminum-core 35kV armored cables, the product’s minimal joint performance degradation and extremely low insulation failure rate significantly reduce expenses for routine inspections, emergency repairs, and localized cable replacements over a 30-year lifecycle, delivering exceptional overall economic value for permanent grid backbone networks and massive industrial infrastructure projects.

• Strategic stock reserves of mainstream conductor sizes shorten order delivery times.

  Readily available stock for common 35kV YJV22 cable specifications (such as 95, 185, and 300mm² three-core cables, and 240 and 400mm² single-core cables) supports small-batch trial orders, urgent replenishment requests, and rapid bulk shipments, effectively preventing construction delays caused by lengthy production lead times.

• The use of standardized, heavy-duty 35kV accessories reduces management costs associated with fragmented procurement.

  The matching 35kV large-format cold-shrink/heat-shrink terminations, cable joints, intermediate joints, and sealing components utilize universal standard dimensions across various conductor cross-sections, eliminating the need for custom orders; this simplifies tasks for project material departments regarding the compilation of procurement lists, incoming quality inspections, and on-site warehouse management.

• 35kV primary feeder cables connecting switchgear at large distribution substations to outdoor pad-mounted transformers, pole-mounted transformers, and downstream high-capacity 35kV distribution node clusters.
• Direct-buried high-voltage trunk lines for urban core grid retrofitting, overhead-to-underground line conversions, and regional grid capacity expansion and upgrades.
• Direct-buried trunk cables interconnecting large-scale pad-mounted transformer clusters with centralized 35kV main switch rooms in the collection systems of large ground-mounted PV plants and onshore wind farms.
• 35kV primary distribution trunk lines within centralized high-voltage power supply systems for heavy metallurgical plants, large mining enterprises, chemical industrial parks, and massive industrial complexes.
• High-voltage transmission cables installed along urban arterial road tunnels, underground utility tunnels, and bridge corridors; suitable for environments exposed to severe risks of mechanical impact, crushing, and damage from large-scale excavation work.
• Interconnecting trunk cables for centralized power supply hubs in industrial parks, 35kV distribution trunk systems supporting large data centers, and emergency backup high-voltage grids for top-tier (Grade III-A) hospitals.
• Medium-distance, direct-buried 35kV trunk and branch distribution lines for large-scale suburban electrification upgrades and rural grid trunk line extensions or retrofits.

Project Requirements: The project required replacing aging, large-scale 35kV overhead trunk lines with underground armored cables across multiple central commercial districts and high-density residential areas. The project involved a massive volume of cable and utilized a deep direct-burial installation method; furthermore, the system had to pass comprehensive partial discharge testing and grid-connection acceptance standards set by the local power utility to ensure the long-term stability, safety, and continuous operation of the public power grid's backbone lines.

Solution Implemented: Bulk supply of 26/35kV YJV22 three-core cables (in 185mm² and 300mm² cross-sections), with a total supply length of 47.8 kilometers.

Project Outcomes: The cable's heavy-duty steel-tape armored structure eliminated the need for large-diameter conduit installation, reducing overall civil engineering costs by 30%; the dual fully-shielded structure successfully passed the full suite of 35kV type tests and partial discharge inspections required by the power authorities; the system has operated stably and without fault since delivery, and the local power utility has designated this YJV22 series cable as the standard underground main feeder model for future urban overhead-to-underground conversion projects.

Project Requirements: Direct-buried interconnection trunk cables were required to link the site's high-capacity box-type transformer clusters with the centralized 35kV main switchgear room. The installation route traversed farmland, presenting risks such as soil compression, rodent activity, and accidental excavation by heavy agricultural machinery. Strict requirements were imposed regarding grid-connection technical compliance and total budget control.

Solution Implemented: A mix of 26/35kV YJV22 three-core and single-core cables was selected, with a total supply length of 29.5 km; cable specifications were determined based on the power generation capacity groupings of individual box-type transformer units.

Project Outcomes: The adoption of a dual-layer shielding structure effectively stabilized partial discharge levels amidst load fluctuations (peak and off-peak) inherent in PV power generation. The direct-burial design streamlined the installation process for large-cross-section cables, enabling early grid connection. Over four years of continuous operational monitoring, no insulation breakdowns or joint overheating failures occurred, and all performance metrics consistently met the grid company's standards for routine inspections and assessments.

Project Requirements: Installation of a new 35kV primary power line—routed through dedicated cable trenches along the plant perimeter and sections of deep direct-burial—to supply power to transformers serving high-capacity smelting, rolling, and forging production lines. The system required extremely low transmission losses and sufficient overload capacity to accommodate future multi-phase production line expansions.

Solution Implemented: Selection of 21/35kV YJV22 three-core, 400mm² armored medium-voltage cables, with a total supply length of 15.3 kilometers.

Project Outcomes: The low-resistance copper conductors effectively reduced energy consumption and voltage drop during full-load operation. The use of extra-large-gauge cables provided ample overload margin, meeting the needs of subsequent multi-phase equipment capacity upgrades. The armored structure effectively prevented accidental damage during plant road reconstruction and utility upgrades, ensuring the line consistently passed internal safety audits and annual third-party power system inspections.

• Comprehensive Electrical Verification Prior to Specification Selection

  Before finalizing the specifications for 35kV YJV22 cables, it is essential to perform calculations for total peak load ampacity and verify long-distance voltage drop, short-circuit thermal stability, and partial discharge design parameters, all while accounting for actual transmission distances and system short-circuit capacity. Our technical team offers complimentary, customized selection reports and technical comparison data to help avoid safety risks associated with insufficient ampacity or wasted investment due to over-specification.

• Use of Specialized 35kV Medium/High-Voltage Heavy-Duty Terminal Accessories for Installation

  Installation requires the use of compatible, large-format cold-shrink or heat-shrink terminal accessories rated for 21/35kV (or 26/35kV) service. Standardized operating procedures must be strictly followed—including semi-conductive layer stripping, insulation layer trimming, stress control tube positioning, and shielding layer restoration—to eliminate electric field distortion and potential sites for partial discharge initiation at the cable termination. The use of lower-voltage rated terminals as substitutes is strictly prohibited.

• Strict Control of Bending Radius During the Pulling and Laying of Large-Cross-Section Cables

  Throughout the laying process, the specified minimum bending radius requirements must be strictly observed. Forced sharp turns or severe bending operations are strictly prohibited to prevent wrinkling of the internal insulation, the formation of air gaps, and the potential for partial discharge defects, all of which could compromise the long-term operational reliability of the 35kV cable. For cables with exceptionally large diameters, anti-abrasion liners and chamfered protective devices must be installed at conduit openings to prevent damage to the outer cable sheath during the pulling operation.

• Mandatory Requirement for Reliable Grounding of Steel-Tape Armor and Metal Shielding Layers at Both Ends

  Both ends of the steel-tape armor layer and the copper-tape metal shielding layer must be reliably grounded independently in accordance with local electrical codes. This measure is essential to suppress induced circulating currents and the accumulation of induced voltage within the metal layers, thereby eliminating potential electrical safety hazards associated with the long-term operation of deeply buried 35kV cables.

• Clear Guidelines on Installation Scope and Environmental Limitations

  This 35kV YJV22 cable is specifically designed for fixed installation via direct burial, in cable trenches, or within tunnels. It is not suitable for long-distance overhead suspension installations or for vertical installations involving significant elevation differences that would subject the cable to immense axial tension. For applications requiring long-term submersion in water, we recommend using the YJV32 steel-wire armored cable as an alternative.

• Professional Storage and Transport Management for Large-Format High-Voltage Cable Drums

  Cable drums must be stored on flat, solid ground within a dry, well-ventilated warehouse, avoiding prolonged exposure to rain or direct sunlight. During loading, unloading, and long-distance transport, precautions must be taken to prevent severe impacts, crushing, or tipping of the drums; such incidents could cause cracking in the outer sheath or damage the internal insulation structure, thereby compromising the dielectric performance of the 35kV cable.

Competitive Advantages of Our 35kV YJV22 Cable for Tenders, Procurement, and EPC Projects

• Comprehensive Documentation Package Tailored for 35kV High-Voltage Tenders

  All products are manufactured in strict accordance with GB/T 12706 and relevant IEC international standards. We provide a complete set of factory qualification certificates, comprehensive type test reports, partial discharge test records, third-party inspection reports, and editable technical data sheets—all free of charge. These documents fully meet the requirements for documentation review, submission, and grid project acceptance in global tenders for 35kV high-voltage products.

• Rigorous raw material selection and comprehensive quality control for high-voltage cables

  We utilize certified 99.97% high-purity electrolytic copper rods and specialized 35kV-grade, partial-discharge-resistant XLPE (cross-linked polyethylene) materials. Core processes—including stranding, extrusion of inner shielding and main insulation, copper tape shielding, armoring, and sheathing—are equipped with real-time online monitoring systems for dimensions and concentricity. This ensures stable conductor DC resistance, uniform insulation thickness, and consistent partial discharge performance across batches, thereby minimizing the risk of failing on-site acceptance inspections during large-scale procurement.

• Flexible customization services tailored to specific project requirements

  We offer customization based on technical drawings and project-specific needs, including flame-retardant modifications (ZA/ZB/ZC grades), upgrades to low-smoke, zero-halogen (LSZH) outer sheaths, and fixed-length cutting services. We also provide customized packaging options—such as large wooden reels, steel reels, and export-grade packaging—covering the full range of cross-sections and voltage ratings for 35kV YJV22 cables.

• Stable pricing via a direct-from-manufacturer model and flexible order minimums

  With our own production facilities, we eliminate intermediary markups. We support small-batch sample orders to meet pre-project qualification testing requirements. For bulk orders, we prioritize production and maintain ample finished-goods inventory for mainstream 35kV YJV22 cable specifications, enabling rapid shipment to meet urgent delivery schedules for high-voltage engineering projects.

• Comprehensive, Full-Lifecycle Technical Support for High-Voltage Engineering

  Our expert cable design engineers provide a suite of services—including load calculations, ampacity verification, lifecycle cost comparisons (copper vs. aluminum), routing optimization, remote and on-site technical guidance for installation, and systematic post-sales quality monitoring. These are backed by formal, long-term product warranties, effectively eliminating technical and quality concerns for procurement and engineering teams following order fulfillment.

• Extensive Experience in Exporting for Overseas High-Voltage Infrastructure Projects

  We possess mature export packaging solutions, robust capabilities for handling customs documentation, and efficient global logistics networks. We maintain a consistent track record of supply for projects across Southeast Asia, Central Asia, Africa, the Middle East, and Latin America, covering substation main feeders, municipal grid backbone upgrades, and large-scale renewable energy infrastructure. Furthermore, we are well-versed in local inspection, acceptance, and compliance filing requirements for mainstream high-voltage backbone specifications (such as 35kV) across various overseas markets.

• Q1: How does the construction of the 35kV YJV22 cable differ from that of 10kV/15kV medium-voltage YJV22 cables?

  A1: 35kV-class cables feature thicker cross-linked polyethylene (XLPE) insulation, internal and external semi-conductive shielding layers, and a continuous copper tape metallic shield. They must also pass mandatory, high-sensitivity partial discharge tests on the finished product to withstand the higher electric field stress associated with 35kV voltage, thereby preventing electrical treeing and insulation breakdown. In contrast, 10kV/15kV cables have thinner insulation, simplified shielding configurations, and lower partial discharge resistance, making them unsuitable for the long-term operation required for 35kV grid backbone lines.

• Q2: Can 35kV YJV22 cables be laid directly underground without protective conduits?

  A2: Yes, this is entirely feasible and represents the most cost-effective installation method for this type of high-voltage backbone cable. Its double-layer overlapping steel tape armor provides reliable protection against soil pressure, excavation impacts, rock punctures, and rodent damage. By eliminating the need for large-diameter conduits and the associated costs of trenching and installation, it is widely adopted in municipal grid upgrades and large-scale renewable energy grid-connection projects worldwide.

• Q3: What are the key differences between the 35kV YJV22 copper-core cable and the YJLV22 aluminum-core armored cable of the same specifications?

  A3: The 35kV YJV22 cable utilizes high-conductivity copper conductors, offering low transmission losses and excellent long-term terminal stability; it is suitable for critical 35kV permanent backbone feeder projects requiring a design service life of over 30 years. The YJLV22 cable employs aluminum conductors; while it offers lower initial procurement costs, it entails slightly higher line losses and a tendency for terminals to deform gradually under long-term pressure, making it typically suitable for budget-constrained, non-critical 35kV secondary branch circuits. Customers may select the appropriate model based on the line's criticality, the project's design service life, and the overall budget.

• Q4: What certification documents can you provide to meet international tender requirements for 35kV cables?

  A4: We can provide manufacturing qualification certificates, ISO9001 quality system certification, CCC, CE, and CB certifications, complete type test documentation (including partial discharge test reports), raw material incoming inspection records, third-party authoritative test certificates, and customized technical parameter sheets specifically prepared for the 35kV YJV22 product according to customer requirements.

• Q5: What is the typical production and delivery lead time for bulk orders of 35kV YJV22 cables?

  A5: Standard, non-flame-retardant products available in stock can be shipped within 3 to 7 working days; the production cycle for customized flame-retardant products (rated ZA, ZB, or ZC) is approximately 10 to 20 working days. For high-voltage EPC project orders with tight schedules, we can arrange priority production to ensure construction deadlines are met.

• Q6: Why is standardized termination installation crucial for the long-term safe operation of 35kV YJV22 high-voltage cables?

  A6: Improper stripping of the semi-conductive layer, substandard insulation trimming, or incorrect installation of stress control tubes can lead to localized electric field concentration at the cable termination. This triggers continuous partial discharge, accelerates insulation aging, and ultimately results in cable breakdown. Using compatible, specialized 35kV termination accessories and strictly adhering to standardized installation procedures effectively eliminates these risks, ensuring the high-voltage cable maintains stable insulation performance over the long term.