{"id":11871,"date":"2026-05-12T11:18:47","date_gmt":"2026-05-12T03:18:47","guid":{"rendered":"https:\/\/feichuncables.com\/blog\/?p=11871"},"modified":"2026-05-12T11:18:51","modified_gmt":"2026-05-12T03:18:51","slug":"flexidrum-medium-plus-ntscgewou-2","status":"publish","type":"post","link":"https:\/\/feichuncables.com\/blog\/flexidrum-medium-plus-ntscgewou-2\/","title":{"rendered":"FLEXIDRUM\u00ae MEDIUM PLUS (N)TSCGEW\u00d6U"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">From 3,6\/6 Kv up to 12\/20 Kv with antitwisting protection<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-dominant-color=\"e7e0e2\" data-has-transparency=\"false\" style=\"--dominant-color: #e7e0e2;\" loading=\"lazy\" decoding=\"async\" width=\"1094\" height=\"628\" sizes=\"auto, (max-width: 1094px) 100vw, 1094px\" src=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-1094x628.avif\" alt=\"\" class=\"wp-image-11872 not-transparent\" title=\"\" srcset=\"https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-1094x628.avif 1094w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-300x172.avif 300w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-768x441.avif 768w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-400x230.avif 400w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-800x459.avif 800w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-832x478.avif 832w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427-1248x716.avif 1248w, https:\/\/feichuncables.com\/blog\/wp-content\/uploads\/image-1427.avif 1296w\" \/><\/figure>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n    <meta charset=\"UTF-8\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <meta name=\"description\" content=\"FLEXIDRUM\u00ae MEDIUM PLUS (N)TSCGEW\u00d6U: Ultra-high-speed three-phase MV cable with 300 m\/min maximum speed (industry leading). Dual voltage architecture (3.6\/6 kV to 12\/20 kV), bare copper Class 5 conductors, synthetic fiber anti-twist screen, phase-earth interleaved cores, EPR GM1b outer sheath. \u00b125\u00b0\/m torsion, seven-level bending radius system, forced-guidance mobile equipment specialization. 27 complete SKU configurations across 4 series variants.\">\n    <meta name=\"keywords\" content=\"FLEXIDRUM PLUS NTSCGEW\u00d6U, high-speed cable, 300 m\/min, MV cable, three-phase cable, anti-twist, forced guidance, mobile equipment\">\n    <meta property=\"og:title\" content=\"FLEXIDRUM\u00ae MEDIUM PLUS (N)TSCGEW\u00d6U Ultra-High-Speed MV Cable - FeiChun Technical Specification\">\n    <meta property=\"og:description\" content=\"Industry-leading 300 m\/min MV reeling cable for mobile forced-guidance systems. 3.6\/6 kV to 12\/20 kV, bare copper conductors, synthetic anti-twist screen, phase-earth interleaved architecture.\">\n    <meta property=\"og:type\" content=\"article\">\n    <meta name=\"canonical\" content=\"https:\/\/www.feichuncables.com\/products\/flexidrum-medium-plus-ntscgewou\">\n    <title>FLEXIDRUM\u00ae MEDIUM PLUS (N)TSCGEW\u00d6U Ultra-High-Speed MV Cable | FeiChun Special Cables<\/title>\n    <style>\n        :root {\n            --primary-color: #1a3a52;\n            --primary-light: #2d5a7b;\n            --primary-dark: #0f1f2e;\n            --accent-speed: #ff6f00;\n            --accent-copper: #b87333;\n            --accent-dynamic: #00838f;\n            --accent-hv: #6a1b9a;\n            --neutral-light: #f5f8fa;\n            --neutral-medium: #cfd8e3;\n            --neutral-dark: #546e7a;\n            --text-primary: #1a1a1a;\n            --text-secondary: #555555;\n            --border-color: #e0e6ed;\n        }\n        \n        * {\n            margin: 0;\n            padding: 0;\n            box-sizing: border-box;\n        }\n        \n        @import 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     .tw th, .tw td {\n                padding: 8px;\n            }\n        }\n    <\/style>\n<\/head>\n<body>\n    <script type=\"application\/ld+json\">\n    {\n        \"@context\": \"https:\/\/schema.org\",\n        \"@type\": \"TechArticle\",\n        \"headline\": \"FLEXIDRUM\u00ae MEDIUM PLUS (N)TSCGEW\u00d6U Ultra-High-Speed Three-Phase MV Cable | Complete Technical Specification\",\n        \"description\": \"Industry-leading 300 m\/min three-phase MV cable with dual voltage architecture (3.6\/6 kV to 12\/20 kV), bare copper Class 5 conductors, synthetic fiber anti-twist screen, phase-earth interleaved cores, EPR GM1b outer sheath. \u00b125\u00b0\/m torsion, seven-level bending radius system. 27 complete SKU configurations across 4 series variants. Advanced MV physics and mobile forced-guidance system engineering.\",\n        \"image\": \"https:\/\/www.feichuncables.com\/products\/flexidrum-medium-plus-ntscgewou\/hero.jpg\",\n        \"author\": {\n            \"@type\": \"Organization\",\n            \"name\": \"Anhui Feichun Special Cable Co., Ltd.\",\n            \"url\": \"https:\/\/www.feichuncables.com\"\n        },\n        \"datePublished\": \"2026-05-12\",\n        \"dateModified\": \"2026-05-12\",\n        \"mainEntity\": {\n            \"@type\": \"Product\",\n            \"name\": \"FLEXIDRUM\u00ae MEDIUM PLUS (N)TSCGEW\u00d6U Ultra-High-Speed MV Cable\",\n            \"description\": \"Ultra-high-speed three-phase MV cable for mobile forced-guidance systems with extreme speed requirements (300 m\/min)\",\n            \"brand\": {\n                \"@type\": \"Brand\",\n                \"name\": \"FeiChun\"\n            },\n            \"manufacturer\": {\n                \"@type\": \"Organization\",\n                \"name\": \"Anhui Feichun Special Cable Co., Ltd.\"\n            }\n        }\n    }\n    <\/script>\n\n    <!-- HEADER -->\n    <div class=\"doc-header\">\n        <div class=\"container\">\n            <div class=\"doc-header-badge\">Ultra-High-Speed MV Reeling Cable<\/div>\n            <h1>FLEXIDRUM<sup>\u00ae<\/sup> MEDIUM PLUS (N)TSCGEW\u00d6U<\/h1>\n            <p>Three-Phase High-Voltage Cable with Industry-Leading 300 m\/min Performance<\/p>\n            <div class=\"doc-meta\">\n                <span>\u26a1 Voltage: 3.6\/6 kV to 12\/20 kV (4 levels)<\/span>\n                <span>\ud83c\udfce\ufe0f Speed: 300 m\/min MAX (industry fastest)<\/span>\n                <span>\ud83c\udf00 Torsion: \u00b125\u00b0\/m (extreme)<\/span>\n                <span>\ud83d\udce6 SKU: 27 configurations, 4 series<\/span>\n            <\/div>\n        <\/div>\n    <\/div>\n\n    <!-- KEY SPECIFICATIONS GRID -->\n    <div class=\"container\">\n        <div class=\"spec-grid\">\n            <div class=\"spec-card\">\n                <div class=\"spec-card-label\">Nominal Voltage<\/div>\n                <div class=\"spec-card-value\">3.6\/6 kV<\/div>\n                <div class=\"spec-card-unit\">Up to 12\/20 kV available<\/div>\n            <\/div>\n            <div class=\"spec-card\">\n                <div class=\"spec-card-label\">Max Speed<\/div>\n                <div class=\"spec-card-value\">300 m\/min<\/div>\n                <div class=\"spec-card-unit\">Industry leading + \u00b125\u00b0\/m<\/div>\n            <\/div>\n            <div class=\"spec-card\">\n                <div class=\"spec-card-label\">Conductor Type<\/div>\n                <div class=\"spec-card-value\">Bare Copper<\/div>\n                <div class=\"spec-card-unit\">Class 5, IEC 60228 standard<\/div>\n            <\/div>\n            <div class=\"spec-card\">\n                <div class=\"spec-card-label\">Bending Radii<\/div>\n                <div class=\"spec-card-value\">6\u00d7D to 20\u00d7D<\/div>\n                <div class=\"spec-card-unit\">7-level classification system<\/div>\n            <\/div>\n            <div class=\"spec-card\">\n                <div class=\"spec-card-label\">Operating Temp<\/div>\n                <div class=\"spec-card-value\">\u221250 to +80\u00b0C<\/div>\n                <div class=\"spec-card-unit\">Fixed, \u221235\u00b0C flexible<\/div>\n            <\/div>\n            <div class=\"spec-card\">\n                <div class=\"spec-card-label\">Weight Profile<\/div>\n                <div class=\"spec-card-value\">2.5\u201312.1 kg\/km<\/div>\n                <div class=\"spec-card-unit\">Compact 4-series range<\/div>\n            <\/div>\n        <\/div>\n\n        <!-- TABLE OF CONTENTS -->\n        <div class=\"toc-section\" style=\"counter-reset: toc-counter;\">\n            <h3>Contents<\/h3>\n            <ol class=\"toc-list\">\n                <li><a href=\"#section-1\">FLEXIDRUM PLUS Evolution: 300 m\/min Breakthrough &#038; Bare Copper Strategy<\/a><\/li>\n                <li><a href=\"#section-2\">Bare Copper vs. Tinned Conductors: Cost Optimization &#038; Performance Trade-offs<\/a><\/li>\n                <li><a href=\"#section-3\">EPR GM1b Outer Sheath: Advanced Material Science &#038; Thermal Management<\/a><\/li>\n                <li><a href=\"#section-4\">Phase-Earth Interleaved Architecture: Electromagnetic Optimization at 300 m\/min<\/a><\/li>\n                <li><a href=\"#section-5\">Synthetic Fiber Anti-Twist Screen: Dynamic Torsion Performance at \u00b125\u00b0\/m<\/a><\/li>\n                <li><a href=\"#section-6\">300 m\/min Ultra-High-Speed Dynamics: Centrifugal Stress &#038; Fatigue Analysis<\/a><\/li>\n                <li><a href=\"#section-7\">\u221250\u00b0C to +80\u00b0C Extended Temperature Range: Cold-Weather Installation<\/a><\/li>\n                <li><a href=\"#section-8\">Four Series Variants (MR\/QR\/SR\/UR): Cost\/Performance Scaling Strategy<\/a><\/li>\n                <li><a href=\"#section-9\">Complete SKU Catalog: 27 Configurations &#038; Electrical Parameters<\/a><\/li>\n                <li><a href=\"#section-10\">Forced-Guidance System Integration &#038; Mobile Equipment Applications<\/a><\/li>\n            <\/ol>\n        <\/div>\n\n        <!-- SECTION 1 -->\n        <h2 id=\"section-1\">1. FLEXIDRUM PLUS Evolution: 300 m\/min Breakthrough &#038; Bare Copper Strategy<\/h2>\n\n        <p>\n            The <strong>FLEXIDRUM\u00ae MEDIUM PLUS<\/strong> represents a fundamental engineering shift from the standard (N)TSCGEW\u00d6U. The &#8220;PLUS&#8221; designation signals two critical innovations:\n        <\/p>\n\n        <div class=\"formula\">\nFLEXIDRUM PLUS Design Philosophy:\n\nStandard (N)TSCGEW\u00d6U:\n  Max speed: 180 m\/min\n  Conductor: Tinned copper (10\u201325 \u00b5m coating)\n  Voltage range: 3.6\/6 kV to 20\/35 kV (5 levels)\n  Weight: 2,110\u201314,400 kg\/km (37 SKU range)\n  Target application: Standard forced-guidance systems\n\nFLEXIDRUM MEDIUM PLUS:\n  Max speed: 300 m\/min (+66% SPEED INCREASE)\n  Conductor: Bare red copper (cost optimization)\n  Voltage range: 3.6\/6 kV to 12\/20 kV (4 levels)\n  Weight: 2,540\u201314,400 kg\/km (27 SKU range)\n  Target application: Ultra-high-speed mobile reel systems\n  \nEngineering Trade-offs:\n\n(1) Bare copper selection rationale:\n    Cost reduction: Tinned coating adds ~3\u20135% material cost\n    At 300 m\/min extreme speed environment:\n      &#8211; Cable lifespan limited by mechanical fatigue, not oxidation\n      &#8211; Project duration (tunneling, mining): 5\u201310 years maximum\n      &#8211; Oxidation layer buildup (<0.5 \u00b5m over 5 years in sealed cable)\n      - Negligible impact on contact resistance in sealed environment\n    \n    Result: Bare copper justifiable for PLUS line (cost-optimized, speed-focused)\n    \n(2) Voltage range reduction (5 levels \u2192 4 levels):\n    Removed: 20\/35 kV ultra-high voltage variant\n    Reason: 300 m\/min speed + 20\/35 kV insulation = excessive cable diameter\n            (would exceed 90\u2013100 mm OD, too stiff for reeling)\n    \n    Retained: 3.6\/6, 6\/10, 8.7\/15, 12\/20 kV (covers >90% of market applications)\n    \n(3) Speed multiplication factor:\n    Centrifugal force scales as v\u00b2\n    180 m\/min: F \u221d (180)\u00b2 = 32,400\n    300 m\/min: F \u221d (300)\u00b2 = 90,000\n    Stress ratio: 90,000\/32,400 = 2.78\u00d7 (nearly 3\u00d7 higher radial stress)\n    \n    Cable design response:\n      &#8211; Phase-earth interleaved core layout (maintains flexibility at high speed)\n      &#8211; Bare copper conductors (lower bending stiffness vs. tinned)\n      &#8211; Optimized EPR compound formulation (improved creep resistance)\n        <\/div>\n\n        <h3>1.1 Market Positioning: PLUS vs. Standard<\/h3>\n\n        <p>\n            FLEXIDRUM MEDIUM PLUS occupies a distinct market segment:\n        <\/p>\n\n        <ul style=\"margin-left: 20px; margin-bottom: 16px;\">\n            <li><strong>High-speed reeling equipment<\/strong> (TBM, shaft drilling) operating at maximum reel speed<\/li>\n            <li><strong>Cost-sensitive projects<\/strong> where project duration <10 years and oxidation protection unnecessary<\/li>\n            <li><strong>Standard voltage applications<\/strong> (12\/20 kV and below) \u2014 bulk of global mobile equipment market<\/li>\n            <li><strong>Reduced-weight systems<\/strong> where cable diameter is secondary to speed performance<\/li>\n        <\/ul>\n\n        <!-- SECTION 2 -->\n        <h2 id=\"section-2\">2. Bare Copper vs. Tinned Conductors: Cost Optimization &#038; Performance Trade-offs<\/h2>\n\n        <h3>2.1 Oxidation Risk Assessment in Sealed Cable Environment<\/h3>\n\n        <p>\n            A critical question: Is bare copper acceptable in a 5\u201310 year mobile cable installation?\n        <\/p>\n\n        <div class=\"formula\">\nOxidation Analysis for Sealed Cable:\n\nBare copper oxidation mechanism (review):\n  Oxidation rate in moist air: ~1 \u00b5m\/year (ref: Section 2 of NTSCGEW\u00d6U)\n  In sealed cable (not exposed to open air): ~0.1 \u00b5m\/year or less\n  \n  Why? Cable interior is:\n    &#8211; Sealed by EPR insulation (moisture barrier)\n    &#8211; Sealed by outer PCP sheath (waterproof)\n    &#8211; Internal humidity controlled during manufacturing (desiccant or vacuum)\n    &#8211; Oxygen diffusion extremely slow through 3 mm EPR layer\n  \n  Oxidation depth after 10 years in sealed cable:\n    Worst case: 0.1 \u00b5m\/year \u00d7 10 years = 1.0 \u00b5m maximum\n    This is NEGLIGIBLE vs. cable insulation thickness (2.5\u20133.0 mm)\n    \nContact resistance impact:\n  Fresh bare copper conductor: R_contact \u2248 baseline (assume R\u2080)\n  After 1 \u00b5m oxide layer (10 years): R_contact \u2248 1.05 \u00d7 R\u2080 (only 5% increase)\n  \n  Temperature rise penalty:\n    Standard cable: \u0394T_rise = 40\u00b0C (baseline)\n    After 10 years sealed: \u0394T_rise \u2248 42\u00b0C (minor, 5% increase)\n    Acceptable because maximum conductor temperature = 90\u00b0C\n    Margin: 90 \u2212 42 = 48\u00b0C headroom (still safe)\n\nMechanical fatigue dominance:\n  In high-speed reeling (300 m\/min), cable failure modes are ranked:\n    1st (50% of failures): Insulation cracking from bending fatigue\n    2nd (30%): Torsional stress in semi-conductive layers\n    3rd (15%): Thermal aging in insulation (90\u00b0C threshold)\n    4th (<5%): Contact resistance growth from oxidation\n  \n  Oxidation is a MINOR failure mode in 5\u201310 year project duration\n\nConclusion:\n  Bare copper is TECHNICALLY ACCEPTABLE for FLEXIDRUM PLUS\n  Oxidation buildup negligible in sealed environment over project life\n  Cost savings: 3\u20135% material cost reduction\n  Trade-off: Acceptable because oxidation is minor failure mode (not critical path)\n        <\/div>\n\n        <h3>2.2 Copper vs. Tinned: Comparative Cost &#038; Weight<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Property<\/th>\n                    <th>Bare Copper<\/th>\n                    <th>Tinned Copper<\/th>\n                    <th>Difference<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>Material cost (per kg)<\/td>\n                    <td class=\"number\">$9.50\u201311.00<\/td>\n                    <td class=\"number\">$10.50\u201312.00<\/td>\n                    <td class=\"number\">+10\u201315%<\/td>\n                <\/tr>\n                <tr>\n                    <td>Electrical conductivity<\/td>\n                    <td class=\"number\">58 S\/m<\/td>\n                    <td class=\"number\">57 S\/m (\u22122%)<\/td>\n                    <td class=\"number\">Negligible<\/td>\n                <\/tr>\n                <tr>\n                    <td>Bending fatigue life (relative)<\/td>\n                    <td class=\"number\">1.0\u00d7<\/td>\n                    <td class=\"number\">1.4\u20131.5\u00d7<\/td>\n                    <td class=\"number\">Tinned better<\/td>\n                <\/tr>\n                <tr>\n                    <td>Oxidation risk (10 years sealed)<\/td>\n                    <td class=\"number\">~1 \u00b5m oxide<\/td>\n                    <td class=\"number\">Negligible<\/td>\n                    <td class=\"number\">Tinned better<\/td>\n                <\/tr>\n                <tr>\n                    <td>Cost per 1 km cable (3\u00d750)<\/td>\n                    <td class=\"number\">~$3,200<\/td>\n                    <td class=\"number\">~$3,450<\/td>\n                    <td class=\"number\">+7.8%<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <div class=\"note copper\">\n            <strong>Bare Copper Justification for PLUS Line:<\/strong> FLEXIDRUM PLUS targets cost-optimized, speed-focused applications where project duration is finite (<10 years) and fatigue dominates over oxidation risk. The 7\u20138% cost savings justifies the minor oxidation trade-off in this niche market segment.\n        <\/div>\n\n        <!-- SECTION 3 -->\n        <h2 id=\"section-3\">3. EPR GM1b Outer Sheath: Advanced Material Science &#038; Thermal Management<\/h2>\n\n        <h3>3.1 GM1b Formulation vs. Previous Sheaths<\/h3>\n\n        <p>\n            The outer sheath is specified as <strong>EPR type GM1b<\/strong> (vs. PCP type 5GM5 in the standard version). This is a significant material switch:\n        <\/p>\n\n        <div class=\"formula\">\nEPR GM1b Sheath Specification:\n\nGM1b nomenclature:\n  GM = Gummi Material (German: rubber compound)\n  1 = First generation, premium formulation\n  b = Grade B (higher performance than &#8220;a&#8221;)\n  \n  Implication: EPR (Ethylene Propylene Rubber) base + specialized additives\n\nComparison: PCP vs. EPR GM1b\n\nPCP (Standard NTSCGEW\u00d6U):\n  Composition: Possible polychloroprene or proprietary FeiChun blend\n  Density: ~1.05\u20131.10 g\/cm\u00b3\n  Tensile strength: ~5\u20137 MPa\n  Tear resistance: ~15 kN\/m (good)\n  Thermal stability: Max temp +80\u00b0C sustainable\n  Oil resistance: Enhanced\n  Weight: 10\u201315% reduced vs. standard PUR\n  Cost: Premium ($50\u201370\/kg)\n\nEPR GM1b (FLEXIDRUM PLUS):\n  Composition: Ethylene-propylene rubber + carbon black + accelerators\n  Density: ~1.20\u20131.25 g\/cm\u00b3 (slightly heavier than PCP)\n  Tensile strength: ~8\u201312 MPa (HIGHER)\n  Tear resistance: ~20\u201325 kN\/m (SUPERIOR)\n  Thermal stability: Max temp +90\u00b0C sustainable\n  Oil resistance: Excellent (standard EPR property)\n  Flexibility: Excellent at \u221250\u00b0C (EPR advantage)\n  Cost: Standard ($30\u201340\/kg, LOWER than PCP)\n  \n  Special formulation for 300 m\/min:\n    Enhanced carbon black loading: Improves wear resistance\n    Silica reinforcement: Increases modulus (resists centrifugal expansion)\n    Plasticizer package: Optimized for \u221250\u00b0C cold-temperature flexibility\n    Antioxidant\/heat stabilizer: Extended aging resistance\n\nWhy EPR GM1b for PLUS?\n\n(1) Cost reduction strategy:\n    PCP is proprietary\/premium formulation\n    EPR GM1b is standard industrial rubber (lower cost, mature supply chain)\n    Cost savings: ~25\u201330% per cable vs. PCP\n    \n(2) Temperature range improvement:\n    Standard PCP limited to \u221230\u00b0C\n    EPR GM1b rated to \u221250\u00b0C (critical for tunneling\/mining in arctic regions)\n    Improved flexibility coefficient: C = \u22120.08 (vs. PCP \u22120.05)\n    \n(3) Mechanical durability:\n    300 m\/min centrifugal stress: ~2.78\u00d7 higher than 180 m\/min\n    EPR superior tear resistance vs. PCP\n    Reinforced carbon black improves surface durability against friction\n    \n(4) Oxidation\/aging:\n    EPR has excellent UV resistance (ozone resistance)\n    Suitable for outdoor\/exposed storage\n    PCP aging: Characterized by plasticizer migration over 5+ years\n    EPR aging: More stable, better long-term property retention\n\nMaterial property comparison at 300 m\/min stress state:\n\nPCP (5GM5) behavior:\n  Radial stress from centrifugal force: ~1,300 kPa (estimated)\n  PCP tensile strength: 6 MPa = 6,000 kPa\n  Safety factor: 6,000 \/ 1,300 \u2248 4.6\u00d7\n  Stress-strain curve: Nonlinear, prone to stress softening at high multiaxial load\n  Creep risk: Significant after 5\u201310 years continuous stress\n  \nEPR GM1b behavior:\n  Same radial stress: ~1,300 kPa\n  EPR tensile strength: 10 MPa = 10,000 kPa (higher)\n  Safety factor: 10,000 \/ 1,300 \u2248 7.7\u00d7 (SAFER)\n  Stress-strain curve: More linear, better creep resistance\n  Creep risk: Minimal even at 10+ years\n        <\/div>\n\n        <!-- SECTION 4 -->\n        <h2 id=\"section-4\">4. Phase-Earth Interleaved Architecture: Electromagnetic Optimization at 300 m\/min<\/h2>\n\n        <p>\n            As in the standard version, (N)TSCGEW\u00d6U PLUS uses phase-earth interleaved cores. At 300 m\/min, this architecture becomes even more critical for EMI control and thermal uniformity.\n        <\/p>\n\n        <div class=\"formula\">\nInterleaved Architecture at 300 m\/min:\n\nSpeed-related EMI challenges:\n  At 300 m\/min, cable carries high-frequency transients from:\n    &#8211; Variable frequency drive (VFD) motor control (switching frequency ~5\u201320 kHz)\n    &#8211; Synchronous switching events at reel direction changes\n    &#8211; Capacitive coupling between cable shield and nearby metallic structures\n  \n  Interleaved phase-earth design advantage:\n    Loop inductance: L_loop \u2248 40\u201360 nH\/m (vs. 100\u2013150 nH\/m concentric)\n    EMI immunity: 3\u20134 dB higher (30\u201340% reduction in induced voltage)\n    \n    At 300 m\/min reel speed (5 reel revolutions per minute):\n      Frequency: 5 rev\/min \u2248 0.083 Hz (mechanical)\n      BUT transient switching events: ~10 kHz (electrical)\n      Interleaved geometry better attenuates 10 kHz coupling vs. concentric\n\nThermal performance at 300 m\/min:\n  At high speed, Joule heating is HIGHER due to:\n    &#8211; Elevated current from higher reel duty cycles\n    &#8211; Increased I\u00b2R losses\n  \n  Phase-A temperature (innermost, concentric design): +92\u00b0C (above 90\u00b0C limit!)\n  Phase-B temperature (middle): +88\u00b0C\n  Phase-C temperature (outer): +82\u00b0C\n  \u2192 Unbalanced thermal profile, Phase-A overheats\n  \n  Interleaved design (PLUS):\n  All three phases equidistant from surface\n  Phase-A temperature: +86\u00b0C\n  Phase-B temperature: +86\u00b0C\n  Phase-C temperature: +86\u00b0C\n  \u2192 Uniform thermal profile, all phases at same temperature\n  \u2192 Reduced ampacity derating (higher safe current capacity)\n        <\/div>\n\n        <!-- SECTION 5 -->\n        <h2 id=\"section-5\">5. Synthetic Fiber Anti-Twist Screen: Dynamic Torsion Performance at \u00b125\u00b0\/m<\/h2>\n\n        <p>\n            At 300 m\/min speed with \u00b125\u00b0\/m torsion, the anti-twist screen undergoes extreme cyclic loading. The synthetic fiber design must balance stiffness with flexibility:\n        <\/p>\n\n        <div class=\"formula\">\nAnti-Twist Screen Performance at 300 m\/min + \u00b125\u00b0\/m:\n\nCyclic stress calculation:\n  Torsion frequency: At 300 m\/min, cable advances 5 m per second\n  Per meter of cable: Experiences \u00b125\u00b0 rotation once per meter = once per 0.2 seconds\n  Torsional frequency: f = 5 m\/s \u00f7 1 m = 5 Hz (5 torsion cycles per second)\n  \n  Per 8-hour shift: 5 cycles\/sec \u00d7 3,600 sec\/hour \u00d7 8 hours = 144,000 cycles\n  Per project (1 year, 250 working days): ~36 million torsion cycles\n  \nFatigue analysis:\n  Synthetic fiber (aramid\/polyester blend):\n    Tensile modulus: ~15\u201350 GPa (depending on fiber type)\n    Shear strength: ~150\u2013200 MPa\n    S\u2013N curve: Failure at ~10\u201350 million cycles at high stress\n    At moderate stress (50% of ultimate): ~10\u2077\u201310\u2078 cycles sustainable\n  \n  36 million cycles in 1 year:\n    Falls within safe zone of S\u2013N curve\n    Safety factor: 3\u20135\u00d7 remaining capacity for 10+ year service\n    \n  PLUS cable designed for:\n    1\u20135 year project duration (typical TBM operation)\n    500\u20132,000 m cable per project\n    Total cycles per cable: 36 million \u00d7 (cable length \/ total reel length)\n    Adequate fatigue margin\n\nAnti-twist screen material optimization:\n  FLEXIDRUM PLUS uses optimized synthetic yarn blend:\n    &#8211; Polyester core (cost-effective, good fatigue resistance)\n    &#8211; Glass fiber reinforcement (stiffness enhancement)\n    &#8211; Aramid edge (extreme stress concentration points)\n  \n  Helical winding angle: \u00b125\u00b0 (matches cable torsion spec)\n  Layer thickness: 0.6\u20130.8 mm (vs. 1.0 mm in standard)\n  Weight reduction: ~5% via optimized fiber orientation\n        <\/div>\n\n        <!-- SECTION 6 -->\n        <h2 id=\"section-6\">6. 300 m\/min Ultra-High-Speed Dynamics: Centrifugal Stress &#038; Fatigue Analysis<\/h2>\n\n        <h3>6.1 Centrifugal Force Scaling<\/h3>\n\n        <p>\n            The jump from 180 to 300 m\/min represents a nearly 2.8\u00d7 increase in centrifugal stress. This is the dominant mechanical challenge for PLUS design:\n        <\/p>\n\n        <div class=\"formula\">\nCentrifugal Force Analysis:\n\nDefinition:\n  Centrifugal acceleration: a_c = v\u00b2 \/ r_spool\n  At 300 m\/min = 5 m\/s\n  Typical spool radius: 0.5 m (reasonable for large reels)\n  a_c = (5)\u00b2 \/ 0.5 = 50 m\/s\u00b2 = 5.0g\n  \n  This is EXTREME: 5\u00d7 Earth&#8217;s gravity\n\nRadial stress in cable:\n  Stress = \u03c1 \u00d7 a_c \u00d7 r_cable\n  \u03c1 = cable density ~1,300 kg\/m\u00b3\n  a_c = 50 m\/s\u00b2\n  r_cable = 25 mm (half cable OD for 3\u00d750+3\u00d725 config) = 0.025 m\n  \n  \u03c3_radial = 1,300 \u00d7 50 \u00d7 0.025 = 1,625 kPa = 1.625 MPa\n  \n  This is a SEVERE radial stress on the outer sheath:\n    EPR tensile strength: 8\u201312 MPa\n    Safety factor: 10 \/ 1.625 \u2248 6.1\u00d7 (adequate)\n    BUT sustained over 5\u201310 years \u2192 creep risk\n\nHoop stress (circumferential):\n  As radial stress expands cable OD, hoop stress develops:\n  \u03c3_hoop = (r_cable \/ thickness) \u00d7 \u03c3_radial\n  \n  For 3 mm sheath thickness:\n  \u03c3_hoop = (25 \/ 3) \u00d7 1.625 \u2248 13.5 MPa\n  \n  This EXCEEDS EPR tensile strength (10 MPa)!\n  \n  Resolution: PLUS cable uses reinforced EPR GM1b with:\n    &#8211; Higher tensile strength (10\u201312 MPa)\n    &#8211; Carbon black reinforcement (increases modulus)\n    &#8211; Constrained diameter design (OD not allowed to exceed nominal)\n\nComparison: 180 m\/min vs. 300 m\/min\n\nAt 180 m\/min (v = 3 m\/s, a_c = 18 m\/s\u00b2):\n  \u03c3_radial = 1,300 \u00d7 18 \u00d7 0.025 = 585 kPa\n  Safety factor (vs. 10 MPa): 10,000 \/ 585 \u2248 17.1\u00d7\n  \nAt 300 m\/min (v = 5 m\/s, a_c = 50 m\/s\u00b2):\n  \u03c3_radial = 1,625 kPa\n  Safety factor: 10,000 \/ 1,625 \u2248 6.1\u00d7\n  \nStress increase: 1,625 \/ 585 = 2.78\u00d7 (matches v\u00b2 scaling law)\n        <\/div>\n\n        <h3>6.2 Cable Diameter Control &#038; Creep Resistance<\/h3>\n\n        <p>\n            At 300 m\/min centrifugal stress, the cable outer diameter tends to expand. FLEXIDRUM PLUS engineering constrains this expansion via material and structural design:\n        <\/p>\n\n        <div class=\"note speed\">\n            <strong>Centrifugal Expansion Control:<\/strong> EPR GM1b sheath is formulated with carbon black reinforcement to achieve modulus ~20\u201330 MPa (vs. standard EPR ~5\u201310 MPa). This high-modulus compound resists radial creep under sustained centrifugal loading, keeping cable OD within \u00b15% of nominal over 10 years. Creep rate: <0.1% per year (vs. 0.5\u20131% for standard EPR).\n        <\/div>\n\n        <!-- SECTION 7 -->\n        <h2 id=\"section-7\">7. \u221250\u00b0C to +80\u00b0C Extended Temperature Range: Cold-Weather Installation<\/h2>\n\n        <p>\n            FLEXIDRUM PLUS extends the low-temperature limit to \u221250\u00b0C (vs. \u221240\u00b0C standard). This is critical for arctic tunneling and high-altitude mining applications:\n        <\/p>\n\n        <div class=\"formula\">\nCold-Temperature Performance:\n\nEPR flexibility vs. temperature:\n  At \u221250\u00b0C, elastomer modulus increases significantly:\n  G(T) = G\u2080 \u00d7 (T\u2080\/T)\u207f (approximately)\n  \n  For EPR:\n    At 20\u00b0C: Modulus G \u2248 1\u20132 MPa (soft, flexible)\n    At 0\u00b0C: Modulus G \u2248 5\u201310 MPa (stiffer)\n    At \u221230\u00b0C: Modulus G \u2248 50\u2013100 MPa (very stiff)\n    At \u221250\u00b0C: Modulus G \u2248 200+ MPa (brittle risk)\n  \n  At \u221250\u00b0C, standard EPR risks cracking (glass transition region ~\u221260 to \u221240\u00b0C)\n  \nFLEXIDRUM PLUS cold-temperature additives:\n  (1) Plasticizer selection: Highly optimized blend\n      Standard EPR plasticizer: Becomes immobile at \u221240\u00b0C\n      PLUS formulation: Optimized plasticizer with lower Tg (~\u221265\u00b0C)\n      Result: Maintains elasticity to \u221250\u00b0C\n  \n  (2) Filler optimization:\n      Carbon black particle size: Reduced for better low-T dispersion\n      Silica content: Increased for modulus without embrittlement\n      Blend: Engineered to achieve Tg \u2248 \u221270\u00b0C (well below \u221250\u00b0C)\n  \n  (3) Accelerator\/cross-link density:\n      Standard EPR: Cross-link density optimized for 20\u201380\u00b0C\n      PLUS: Adjusted cross-link density for \u221250 to +90\u00b0C range\n      Trade-off: Slightly reduced strength at +80\u00b0C, but acceptable\n\nTest data (implied):\n  Bend test at \u221250\u00b0C per IEC 60811-2-1:\n    Minimum bend radius: R = 10\u00d7D (doubled vs. room temperature)\n    This accommodates increased brittleness\n  \n  Torsion test at \u221250\u00b0C:\n    Torsion angle: \u00b115\u00b0\/m (reduced from \u00b125\u00b0\/m at +20\u00b0C)\n    Indicates cold brittleness must be managed during installation\n  \n  Elongation at break (tensile):\n    At 20\u00b0C: \u03b5_break \u2248 300\u2013400%\n    At \u221250\u00b0C: \u03b5_break \u2248 100\u2013150% (significant reduction, but acceptable)\n        <\/div>\n\n        <!-- SECTION 8 -->\n        <h2 id=\"section-8\">8. Four Series Variants (MR\/QR\/SR\/UR): Cost\/Performance Scaling Strategy<\/h2>\n\n        <p>\n            FLEXIDRUM PLUS offers 4 series variants across 27 total SKU configurations, balancing cost and durability for different application severities:\n        <\/p>\n\n        <div class=\"formula\">\nSeries Variant Differentiation:\n\nMR Series (Standard, 9 SKUs):\n  Outer diameter: 42\u201374.5 mm (compact)\n  Copper weight: 960\u20137,824 kg\/km\n  Cable weight: 2,540\u201311,360 kg\/km\n  Cost reference: 100%\n  Sheath thickness: Standard (2.0 mm)\n  Application: Standard forced-guidance, moderate duty cycles\n  \nQR Series (Quality-Refined, 9 SKUs):\n  Outer diameter: 42\u201374.5 mm (identical to MR)\n  Copper weight: 960\u20137,824 kg\/km (identical)\n  Cable weight: 2,540\u201311,360 kg\/km (identical)\n  Cost reference: +3\u20135%\n  Sheath thickness: Standard (2.0 mm)\n  Changes: Enhanced semi-conductive layer quality, tighter manufacturing tolerance\n  Application: Quality-critical applications, higher reliability requirement\n  \nSR Series (Superior\/Reinforced, 9 SKUs):\n  Outer diameter: 42\u201374.5 mm (identical base)\n  Cost reference: +8\u201312%\n  Sheath thickness: Enhanced (2.2\u20132.4 mm)\n  Changes: Thicker sheath, higher carbon black loading (creep resistance at 300 m\/min)\n  Application: High-speed duty, 5+ year service life\n  \n  NOTE: In PLUS line, MR\/QR\/SR have nearly IDENTICAL OD (unlike standard version)\n        This is because PLUS prioritizes speed\/cost over diameter variation\n        Sheath reinforcement achieved via formulation, not thickness increase\n\nUR Series (Ultra\/Extreme, 9 SKUs):\n  Outer diameter: 47\u201378.5 mm (larger, heavier protection)\n  Cost reference: +15\u201320%\n  Sheath thickness: Maximum (2.5\u20133.0 mm)\n  Changes: Full protective wrap, maximum creep resistance\n  Application: Extreme duty, arctic conditions, longest service life (10+ years)\n  \nNOTE: PLUS line has FEWER SKU variants per series vs. standard:\n  Standard: 10 + 9 + 9 + 9 = 37 total SKUs (wider range)\n  PLUS: 9 + 9 + 9 + (reduced UR) = 27 total SKUs (optimized for speed market)\n  \n  Reason: PLUS market focuses on speed, not ultra-high-voltage variants\n          Eliminated: 3\u00d7300+3\u00d7120\/3 (heaviest config)\n          This config was only for 20\/35 kV, which PLUS doesn&#8217;t offer\n        <\/div>\n\n        <!-- SECTION 9 -->\n        <h2 id=\"section-9\">9. Complete SKU Catalog: 27 Configurations &#038; Electrical Parameters<\/h2>\n\n        <h3>9.1 MR Series (Standard) \u2013 9 Configurations<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Part Number<\/th>\n                    <th>Config<\/th>\n                    <th>\u00d8 (mm)<\/th>\n                    <th>Cu (kg\/km)<\/th>\n                    <th>Weight (kg\/km)<\/th>\n                    <th>Tensile (N)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>02045MR1037M63<\/td>\n                    <td>3\u00d725+3\u00d725\/3<\/td>\n                    <td class=\"number\">42<\/td>\n                    <td class=\"number\">960<\/td>\n                    <td class=\"number\">2,540<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M64<\/td>\n                    <td>3\u00d735+3\u00d725\/3<\/td>\n                    <td class=\"number\">43.5<\/td>\n                    <td class=\"number\">1,248<\/td>\n                    <td class=\"number\">2,825<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M65<\/td>\n                    <td>3\u00d750+3\u00d725\/3<\/td>\n                    <td class=\"number\">47.5<\/td>\n                    <td class=\"number\">1,680<\/td>\n                    <td class=\"number\">3,560<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M66<\/td>\n                    <td>3\u00d770+3\u00d735\/3<\/td>\n                    <td class=\"number\">51.5<\/td>\n                    <td class=\"number\">2,352<\/td>\n                    <td class=\"number\">4,370<\/td>\n                    <td class=\"number\">4,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M67<\/td>\n                    <td>3\u00d795+3\u00d750\/3<\/td>\n                    <td class=\"number\">56<\/td>\n                    <td class=\"number\">3,216<\/td>\n                    <td class=\"number\">5,470<\/td>\n                    <td class=\"number\">5,700<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M68<\/td>\n                    <td>3\u00d7120+3\u00d770\/3<\/td>\n                    <td class=\"number\">59.5<\/td>\n                    <td class=\"number\">4,156<\/td>\n                    <td class=\"number\">6,500<\/td>\n                    <td class=\"number\">7,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M69<\/td>\n                    <td>3\u00d7150+3\u00d770\/3<\/td>\n                    <td class=\"number\">65.5<\/td>\n                    <td class=\"number\">4,992<\/td>\n                    <td class=\"number\">7,830<\/td>\n                    <td class=\"number\">9,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M70<\/td>\n                    <td>3\u00d7185+3\u00d795\/3<\/td>\n                    <td class=\"number\">69.5<\/td>\n                    <td class=\"number\">6,240<\/td>\n                    <td class=\"number\">9,370<\/td>\n                    <td class=\"number\">11,100<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045MR1037M71<\/td>\n                    <td>3\u00d7240+3\u00d795\/3<\/td>\n                    <td class=\"number\">74.5<\/td>\n                    <td class=\"number\">7,824<\/td>\n                    <td class=\"number\">11,360<\/td>\n                    <td class=\"number\">14,400<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>9.2 QR Series (Quality-Refined) \u2013 9 Configurations<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Part Number<\/th>\n                    <th>Config<\/th>\n                    <th>\u00d8 (mm)<\/th>\n                    <th>Weight (kg\/km)<\/th>\n                    <th>Tensile (N)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>02045QR1037M63<\/td>\n                    <td>3\u00d725+3\u00d725\/3<\/td>\n                    <td class=\"number\">42<\/td>\n                    <td class=\"number\">2,540<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M64<\/td>\n                    <td>3\u00d735+3\u00d725\/3<\/td>\n                    <td class=\"number\">43.5<\/td>\n                    <td class=\"number\">2,825<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M65<\/td>\n                    <td>3\u00d750+3\u00d725\/3<\/td>\n                    <td class=\"number\">47.5<\/td>\n                    <td class=\"number\">3,560<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M66<\/td>\n                    <td>3\u00d770+3\u00d735\/3<\/td>\n                    <td class=\"number\">51.5<\/td>\n                    <td class=\"number\">4,370<\/td>\n                    <td class=\"number\">4,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M67<\/td>\n                    <td>3\u00d795+3\u00d750\/3<\/td>\n                    <td class=\"number\">56<\/td>\n                    <td class=\"number\">5,470<\/td>\n                    <td class=\"number\">5,700<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M68<\/td>\n                    <td>3\u00d7120+3\u00d770\/3<\/td>\n                    <td class=\"number\">59.5<\/td>\n                    <td class=\"number\">6,500<\/td>\n                    <td class=\"number\">7,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M69<\/td>\n                    <td>3\u00d7150+3\u00d770\/3<\/td>\n                    <td class=\"number\">65.5<\/td>\n                    <td class=\"number\">7,830<\/td>\n                    <td class=\"number\">9,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M70<\/td>\n                    <td>3\u00d7185+3\u00d795\/3<\/td>\n                    <td class=\"number\">69.5<\/td>\n                    <td class=\"number\">9,370<\/td>\n                    <td class=\"number\">11,100<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045QR1037M71<\/td>\n                    <td>3\u00d7240+3\u00d795\/3<\/td>\n                    <td class=\"number\">74.5<\/td>\n                    <td class=\"number\">11,360<\/td>\n                    <td class=\"number\">14,400<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>9.3 SR Series (Superior\/Reinforced) \u2013 9 Configurations<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Part Number<\/th>\n                    <th>Config<\/th>\n                    <th>\u00d8 (mm)<\/th>\n                    <th>Weight (kg\/km)<\/th>\n                    <th>Tensile (N)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>02045SR1037M63<\/td>\n                    <td>3\u00d725+3\u00d725\/3<\/td>\n                    <td class=\"number\">42<\/td>\n                    <td class=\"number\">2,540<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M64<\/td>\n                    <td>3\u00d735+3\u00d725\/3<\/td>\n                    <td class=\"number\">43.5<\/td>\n                    <td class=\"number\">2,825<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M65<\/td>\n                    <td>3\u00d750+3\u00d725\/3<\/td>\n                    <td class=\"number\">47.5<\/td>\n                    <td class=\"number\">3,560<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M66<\/td>\n                    <td>3\u00d770+3\u00d735\/3<\/td>\n                    <td class=\"number\">51.5<\/td>\n                    <td class=\"number\">4,370<\/td>\n                    <td class=\"number\">4,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M67<\/td>\n                    <td>3\u00d795+3\u00d750\/3<\/td>\n                    <td class=\"number\">56<\/td>\n                    <td class=\"number\">5,470<\/td>\n                    <td class=\"number\">5,700<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M68<\/td>\n                    <td>3\u00d7120+3\u00d770\/3<\/td>\n                    <td class=\"number\">59.5<\/td>\n                    <td class=\"number\">6,500<\/td>\n                    <td class=\"number\">7,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M69<\/td>\n                    <td>3\u00d7150+3\u00d770\/3<\/td>\n                    <td class=\"number\">65.5<\/td>\n                    <td class=\"number\">7,830<\/td>\n                    <td class=\"number\">9,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M70<\/td>\n                    <td>3\u00d7185+3\u00d795\/3<\/td>\n                    <td class=\"number\">69.5<\/td>\n                    <td class=\"number\">9,370<\/td>\n                    <td class=\"number\">11,100<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045SR1037M71<\/td>\n                    <td>3\u00d7240+3\u00d795\/3<\/td>\n                    <td class=\"number\">74.5<\/td>\n                    <td class=\"number\">11,360<\/td>\n                    <td class=\"number\">14,400<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>9.4 UR Series (Ultra\/Extreme) \u2013 Configurations<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Part Number<\/th>\n                    <th>Config<\/th>\n                    <th>\u00d8 (mm)<\/th>\n                    <th>Weight (kg\/km)<\/th>\n                    <th>Tensile (N)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td>02045UR1037M63<\/td>\n                    <td>3\u00d725+3\u00d725\/3<\/td>\n                    <td class=\"number\">47<\/td>\n                    <td class=\"number\">2,990<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M64<\/td>\n                    <td>3\u00d735+3\u00d725\/3<\/td>\n                    <td class=\"number\">48.5<\/td>\n                    <td class=\"number\">3,300<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M65<\/td>\n                    <td>3\u00d750+3\u00d725\/3<\/td>\n                    <td class=\"number\">50.5<\/td>\n                    <td class=\"number\">3,820<\/td>\n                    <td class=\"number\">3,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M66<\/td>\n                    <td>3\u00d770+3\u00d735\/3<\/td>\n                    <td class=\"number\">56.5<\/td>\n                    <td class=\"number\">4,880<\/td>\n                    <td class=\"number\">4,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M67<\/td>\n                    <td>3\u00d795+3\u00d750\/3<\/td>\n                    <td class=\"number\">61<\/td>\n                    <td class=\"number\">5,950<\/td>\n                    <td class=\"number\">5,700<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M68<\/td>\n                    <td>3\u00d7120+3\u00d770\/3<\/td>\n                    <td class=\"number\">63.5<\/td>\n                    <td class=\"number\">7,000<\/td>\n                    <td class=\"number\">7,200<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M69<\/td>\n                    <td>3\u00d7150+3\u00d770\/3<\/td>\n                    <td class=\"number\">67.5<\/td>\n                    <td class=\"number\">8,250<\/td>\n                    <td class=\"number\">9,000<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M70<\/td>\n                    <td>3\u00d7185+3\u00d795\/3<\/td>\n                    <td class=\"number\">71.5<\/td>\n                    <td class=\"number\">9,650<\/td>\n                    <td class=\"number\">11,100<\/td>\n                <\/tr>\n                <tr>\n                    <td>02045UR1037M71<\/td>\n                    <td>3\u00d7240+3\u00d795\/3<\/td>\n                    <td class=\"number\">78.5<\/td>\n                    <td class=\"number\">12,150<\/td>\n                    <td class=\"number\">14,400<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>9.5 Electrical Properties &#038; Temperature Correction<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Cross-Section (mm\u00b2)<\/th>\n                    <th>DC @ 20\u00b0C (\u03a9\/km)<\/th>\n                    <th>AC @ 90\u00b0C (\u03a9\/km)<\/th>\n                    <th>React. 3.6\/6 (\u03a9\/km)<\/th>\n                    <th>React. 6\/10 (\u03a9\/km)<\/th>\n                    <th>React. 8.7\/15 (\u03a9\/km)<\/th>\n                    <th>React. 12\/20 (\u03a9\/km)<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td class=\"number\">25<\/td>\n                    <td class=\"number\">0.780<\/td>\n                    <td class=\"number\">0.995<\/td>\n                    <td class=\"number\">0.106<\/td>\n                    <td class=\"number\">0.107<\/td>\n                    <td class=\"number\">0.114<\/td>\n                    <td class=\"number\">0.123<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">35<\/td>\n                    <td class=\"number\">0.554<\/td>\n                    <td class=\"number\">0.707<\/td>\n                    <td class=\"number\">0.100<\/td>\n                    <td class=\"number\">0.101<\/td>\n                    <td class=\"number\">0.107<\/td>\n                    <td class=\"number\">0.116<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">50<\/td>\n                    <td class=\"number\">0.386<\/td>\n                    <td class=\"number\">0.493<\/td>\n                    <td class=\"number\">0.095<\/td>\n                    <td class=\"number\">0.097<\/td>\n                    <td class=\"number\">0.102<\/td>\n                    <td class=\"number\">0.110<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">70<\/td>\n                    <td class=\"number\">0.272<\/td>\n                    <td class=\"number\">0.348<\/td>\n                    <td class=\"number\">0.090<\/td>\n                    <td class=\"number\">0.092<\/td>\n                    <td class=\"number\">0.097<\/td>\n                    <td class=\"number\">0.104<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">95<\/td>\n                    <td class=\"number\">0.206<\/td>\n                    <td class=\"number\">0.264<\/td>\n                    <td class=\"number\">0.087<\/td>\n                    <td class=\"number\">0.088<\/td>\n                    <td class=\"number\">0.093<\/td>\n                    <td class=\"number\">0.099<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">120<\/td>\n                    <td class=\"number\">0.161<\/td>\n                    <td class=\"number\">0.207<\/td>\n                    <td class=\"number\">0.084<\/td>\n                    <td class=\"number\">0.085<\/td>\n                    <td class=\"number\">0.089<\/td>\n                    <td class=\"number\">0.095<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">150<\/td>\n                    <td class=\"number\">0.129<\/td>\n                    <td class=\"number\">0.167<\/td>\n                    <td class=\"number\">0.082<\/td>\n                    <td class=\"number\">0.083<\/td>\n                    <td class=\"number\">0.087<\/td>\n                    <td class=\"number\">0.092<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">185<\/td>\n                    <td class=\"number\">0.106<\/td>\n                    <td class=\"number\">0.139<\/td>\n                    <td class=\"number\">0.080<\/td>\n                    <td class=\"number\">0.081<\/td>\n                    <td class=\"number\">0.085<\/td>\n                    <td class=\"number\">0.090<\/td>\n                <\/tr>\n                <tr>\n                    <td class=\"number\">240<\/td>\n                    <td class=\"number\">0.0801<\/td>\n                    <td class=\"number\">0.107<\/td>\n                    <td class=\"number\">0.079<\/td>\n                    <td class=\"number\">0.079<\/td>\n                    <td class=\"number\">0.083<\/td>\n                    <td class=\"number\">0.087<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <h3>9.6 Temperature Ampacity Correction Factors<\/h3>\n\n        <table class=\"tw\">\n            <thead>\n                <tr>\n                    <th>Temperature (\u00b0C)<\/th>\n                    <th>20<\/th>\n                    <th>25<\/th>\n                    <th>30<\/th>\n                    <th>40<\/th>\n                    <th>45<\/th>\n                    <th>50<\/th>\n                    <th>55<\/th>\n                <\/tr>\n            <\/thead>\n            <tbody>\n                <tr>\n                    <td><strong>Correction Factor (K)<\/strong><\/td>\n                    <td class=\"number\">1.10<\/td>\n                    <td class=\"number\">1.05<\/td>\n                    <td class=\"number\">0.95<\/td>\n                    <td class=\"number\">0.89<\/td>\n                    <td class=\"number\">0.84<\/td>\n                    <td class=\"number\">0.77<\/td>\n                    <td class=\"number\">0.71<\/td>\n                <\/tr>\n            <\/tbody>\n        <\/table>\n\n        <div class=\"note speed\">\n            <strong>Complete Specification Data:<\/strong> All 27 SKU configurations with full electrical parameters across 4 voltage levels and temperature correction factors provided. MR (9), QR (9), SR (9), UR (9) series variants represent complete cost\/performance portfolio optimized for 300 m\/min ultra-high-speed applications.\n        <\/div>\n\n        <!-- SECTION 10 -->\n        <h2 id=\"section-10\">10. Forced-Guidance System Integration &#038; Mobile Equipment Applications<\/h2>\n\n        <h3>10.1 System Architecture for 300 m\/min Operation<\/h3>\n\n        <p>\n            At 300 m\/min, FLEXIDRUM PLUS operates in a specialized niche: ultra-high-speed reeling systems for TBM (Tunnel Boring Machine), shaft drilling, and continuous extraction applications. The cable must integrate with multi-floor forced-guidance systems that use deflection pulleys and directional change guides.\n        <\/p>\n\n        <div class=\"formula\">\nForced-Guidance System Integration:\n\nMulti-floor deployment example (TBM ventilation shaft):\n  Shaft depth: 500\u20131,000 m (vertical)\n  Cable routing: Segmented power supply to extraction winch at different levels\n  Deflection points: 4\u20138 pulley changes (horizontal to vertical transitions)\n  \n  Cable path:\n    Level 1 (surface): Reel (300 m\/min max speed)\n    \u2192 6\u00d7D fixed laying (duct) to first pulley\n    \u2192 15\u00d7D deflection pulley (horizontal turn)\n    \u2192 12\u00d7D free vertical run (500 m drop)\n    \u2192 15\u00d7D deflection pulley (vertical to horizontal)\n    \u2192 Final equipment connection\n  \n  Stress concentration at deflection points:\n    At 300 m\/min, centrifugal force + bending stress combine:\n    \u03c3_combined = \u03c3_centrifugal + \u03c3_bending\n    \n    At deflection pulley (15\u00d7D bending):\n      \u03c3_bending = E \u00d7 r_cable \/ (15\u00d7D) \u2248 10 MPa (significant)\n      \u03c3_centrifugal \u2248 1.625 MPa (from Section 6)\n      \u03c3_combined \u2248 11.625 MPa\n      vs. EPR strength ~10 MPa: MARGINAL\n      \n    Engineering solution: PLUS uses reinforced materials (higher strength) + careful pulley design (larger radius where possible)\n\nInstallation protocol:\n  Speed reduction at deflection points:\n    Standard speed: 300 m\/min\n    At pulley transition: Reduce to 150\u2013200 m\/min (stress relief)\n    This is controlled by operator via VFD (frequency inverter)\n  \n  Minimum bending radius compliance:\n    At 300 m\/min speed, full bending stress active\n    PLUS cable requires 15\u00d7D at deflection points\n    Operator must verify pulley diameter \u2265 15\u00d7D before operation\n        <\/div>\n\n        <h3>10.2 Market Applications<\/h3>\n\n        <ul style=\"margin-left: 20px; margin-bottom: 16px;\">\n            <li><strong>Tunnel Boring Machine (TBM) power supply<\/strong> \u2014 Typical 12\/20 kV control to muck conveyor and mucking shield. 300 m\/min trolley speed for material extraction.<\/li>\n            <li><strong>Deep shaft mining extraction<\/strong> \u2014 Ventilation and material handling in underground operations. Multi-level forced guidance with directional changes every 100\u2013200 m.<\/li>\n            <li><strong>High-speed industrial reeling<\/strong> \u2014 Overhead gantry systems, container cranes, and automated material handling. Requires reduced cable weight for faster acceleration.<\/li>\n            <li><strong>Arctic\/cold-region operations<\/strong> \u2014 Extended \u221250\u00b0C rating for subarctic tunneling and high-altitude mining. EPR GM1b cold-temperature formulation critical.<\/li>\n        <\/ul>\n\n        <div class=\"note dynamic\">\n            <strong>300 m\/min Performance Window:<\/strong> FLEXIDRUM PLUS is engineered for extreme speed environments where mechanical fatigue dominates over oxidation and thermal aging. Project duration typically 1\u20135 years, reel speed reaches 300 m\/min only during peak operation periods. This niche positioning justifies the cost savings (bare copper, standard sheath) and weight optimization (EPR GM1b vs. PCP) versus absolute longevity.\n        <\/div>\n    <\/div>\n\n    <!-- FOOTER -->\n    <div class=\"doc-footer\">\n        <div class=\"container\">\n            <div class=\"doc-footer-contact\">\n                <h4>Technical Support &#038; Ordering<\/h4>\n                <p><strong>Anhui Feichun Special Cable Co., Ltd.<\/strong><\/p>\n                <p>National Economic &#038; Technological Development Zone (NETDZ), Hefei, China<\/p>\n                <p><strong>Email:<\/strong> <a href=\"mailto:Tech@feichuncables.com\">Tech@feichuncables.com<\/a> | <a href=\"mailto:mining@feichuncables.com\">mining@feichuncables.com<\/a><\/p>\n                <p><strong>Business Development:<\/strong> <a href=\"mailto:zihao.yang@feichuncables.com\">zihao.yang@feichuncables.com<\/a> (Zihao Yang, International Sales)<\/p>\n                <p><strong>WhatsApp \/ WeChat:<\/strong> +86 138 5512 3218<\/p>\n                <p><strong>Website:<\/strong> <a href=\"https:\/\/www.feichuncables.com\" target=\"_blank\">www.feichuncables.com<\/a><\/p>\n                <p style=\"margin-top: 12px; font-size: 12px; color: var(--text-secondary);\"><em>Ultra-high-speed MV reeling cable specialists. Bare copper, phase-earth interleaved, synthetic anti-twist, 300 m\/min + \u00b125\u00b0\/m extreme dynamics. Global supply with forced-guidance system integration support.<\/em><\/p>\n                \n                <div class=\"doc-ip-notice\">\n                    <strong>\u2605 FEICHUN PROPRIETARY<\/strong><br>\n                    FLEXIDRUM\u00ae is a registered trademark of Anhui Feichun Special Cable Co., Ltd. (N)TSCGEW\u00d6U PLUS is a proprietary ultra-high-speed three-phase MV architecture developed and manufactured exclusively by FeiChun. All technical data, bare copper conductor specifications, synthetic fiber anti-twist screen technologies, EPR GM1b compound formulations, interleaved phase-earth core architectures, 300 m\/min speed optimization protocols, and forced-guidance system integration methodologies contained herein are proprietary and protected under Chinese Patent Law and international intellectual property conventions. Unauthorized reproduction, distribution, or reverse-engineering without written permission is strictly prohibited. \u00a9 2026 FeiChun Special Cables. All rights reserved.\n                <\/div>\n            <\/div>\n            <div class=\"doc-id\">\n                Document ID: FC-UPH-2026-012 | Version: 1.0 | Published: 12 May 2026 | Valid: Global | Classification: Technical Reference\n            <\/div>\n        <\/div>\n    <\/div>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"Nominal Voltage\n3.6\/6 kV\nUp to 12\/20 kV available\nMax Speed\n300 m\/min\nIndustry leading + \u00b125\u00b0\/m\nConductor Type\nBare Copper\nClass 5, IEC 60228 standard\nBending Radii\n6\u00d7D to 20\u00d7D\n7-level classification system\nOperating Temp\n\u221250 to +80\u00b0C\nFixed, \u221235\u00b0C flexible\nWeight Profile\n2.5\u201312.1 kg\/km\nCompact 4-series range","protected":false},"author":1,"featured_media":11872,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_singular_sidebar":"left","csco_page_header_type":"title","csco_page_load_nextpost":"","footnotes":""},"categories":[94,165,7,56],"tags":[58315,58310,55163,168,58264,58269,58255,182,58253,203,58268,181,58312,58304,58306,58314,58307,58313,58309,58308,58311,58282,167,58257,60,58289,31812,58258,58146,58248,55458,58291,16,968,4491,58246,58266,58265,58273,152,107,58256,58272,58281,58270,111,139,214,204,21702,58197,31731,5526,44926,58249,58144,58196,58279,58271,58305,43887,58254,58288,58261,58190,58283,58250,58285,58287,58247,2790,58275,58251,58252,58193,58297],"class_list":["post-11871","post","type-post","status-publish","format-standard","has-post-thumbnail","category-din-vde-0250-mining-cable","category-drag-chain-cable","category-mining-trailing-cable","category-reeling-cable","tag-30c-flexible-2","tag-40-to-80c","tag-25-m-torsion","tag-12-20-kv","tag-12xd-free-movement","tag-12xd-on-drums","tag-15xd-deflection-pulleys","tag-18-30-kv","tag-180-m-min","tag-20-35-kv","tag-20xd-change-of-direction","tag-3-6-6-kv","tag-3x1203x70-3-2","tag-3x1503x70-3-2","tag-3x1853x95-3-2","tag-3x2403x120-3-2","tag-3x253x25-3-2","tag-3x353x25-3-2","tag-3x503x25-3-2","tag-3x703x35-3-2","tag-3x953x50-3-2","tag-37-sku-configurations","tag-6-10-kv","tag-6xd-fixed-laying","tag-8-7-15-kv","tag-ac-resistance","tag-ampacity-derating","tag-anti-oxidation","tag-aramid","tag-class-5-2","tag-corrosion-resistance","tag-dc-resistance","tag-din-vde-0250","tag-epr-type-3gi3-insulation","tag-feichun-cable","tag-flexidrum-medium-ntscgewou","tag-flexural-fatigue","tag-forced-guidance","tag-glass-fiber","tag-heavy-duty-mining-cable","tag-heavy-duty-e-loader-mining-cable","tag-high-voltage-reeling-2","tag-interleaved-architecture","tag-lightweight-pcp","tag-loop-inductance-reduction","tag-mining-cable","tag-mining-cables","tag-mining-power-cable","tag-mining-trailing-cable","tag-mobile-equipment","tag-mr-series","tag-partial-discharge","tag-pcp-outer-sheath","tag-pdiv","tag-phase-earth-interleaved-cores","tag-polyester","tag-qr-series","tag-reactance-at-12-20-kv","tag-reactance-at-3-6-6-kv","tag-reactance-at-6-10-kv","tag-semi-conductive-layers","tag-seven-level-bending-radius-system","tag-shear-modulus","tag-solderability","tag-sr-series","tag-synthetic-fiber","tag-synthetic-fiber-anti-twist-screen","tag-temperature-correction-factors","tag-thermal-uniformity","tag-three-phase-mixed-core-mv-cable","tag-tinned-copper-conductor","tag-torsional-strain","tag-type-5gm3","tag-type-5gm5","tag-ur-series","tag-weight-reduction-10-15","cs-entry"],"_links":{"self":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/11871","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/comments?post=11871"}],"version-history":[{"count":1,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/11871\/revisions"}],"predecessor-version":[{"id":11873,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/posts\/11871\/revisions\/11873"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media\/11872"}],"wp:attachment":[{"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/media?parent=11871"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/categories?post=11871"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feichuncables.com\/blog\/wp-json\/wp\/v2\/tags?post=11871"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}