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Product

Dynamic MV inter-array submarine cableIEC 6302633 kV / 66 kVFloating Wind

Dynamic Inter-Array Cable33 kV & 66 kV dynamic three-core submarine cable for floating offshore wind turbines

Dynamic medium-voltage (18/30(36) kV and 36/66(72.5) kV) three-core submarine inter-array cable qualified to IEC 63026 and CIGRE TB 610/722 for floating offshore wind turbines (FOWT) in lazy-wave and tethered-wave water-column suspension.

Water-resistant
Anti-torsion braid
EMC screen
Approved
Order designation
DIAC-66-3X300-48FO
Nominal OD
162.0 mm
Copper weight
9,260 kg/km
Weight in sea
23,500 kg/km
Max tension
285 kN
All sizes (14)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Voltage grade
33 kV / 66 kV
18/30(36) & 36/66(72.5) kV AC
Conductor
3 × 95–800 mm²
Water-blocked compacted copper
Radial barrier
Cu / CuNi Screen
Fatigue-resistant corrugated sheath
Optical unit
24–48 SM Fibres
Dual interstitial 316L FIMT tubes
Design life
25–30 Years
10⁷ wave-cycle fatigue qualified
Standard
IEC 63026
CIGRE TB 610 / TB 722 & DNV-RP-F401

Typical values for this cable type, based on IEC 63026 / CIGRE TB 610 / CIGRE TB 722 — confirmed in the datasheet and quotation for your order.

Application fit

Is Dynamic Inter-Array Cable right for your machine?

Engineered specifically for dynamic water-column suspension between floating wind semi-submersibles/spars and the seabed or neighbouring platforms.

Immersion & wet locations

Suitable

Corrugated copper/CuNi metallic sheath and longitudinal conductor seal block water treeing over a 25–30 year fatigue life.

Free-hanging vertical run

Suitable

Torque-balanced contra-helical galvanised steel armour supports lazy-wave and W-shaped dynamic catenary hang-offs.

Offshore platform & shipboard deck trays

Suitable

Extruded HDPE outer sheath interfaces cleanly with dynamic bend stiffeners, distributed buoyancy modules and I-tube hang-offs.

Motorised monospiral reel

Not suitable

Submarine inter-array cable is installed from carousel cable-lay vessels and is not a crane reeling cable.

Use NTSCGEWÖU MV Reeling

Energy chain / drag chain

Not suitable

Large-diameter 33/66 kV submarine power cable cannot be installed in factory energy chains.

Use Subsea Trencher Umbilical
Typical machinesFloating Offshore Wind (FOWT)Subsea Substation Tie-BacksFloating Oil & Gas ElectrificationWave & Tidal Array ExportDeepwater Dynamic Risers

Construction

Layer by layer

Representative 66 kV dynamic inter-array cross-section: 3 × 300 mm² water-blocked Cu cores + WTR-XLPE + corrugated Cu sheath + 2×24FO FIMT + contra-helical armour + HDPE sheath.

123456
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Longitudinally water-blocked conductorCompacted circular stranded copper (IEC 60228 Class 2 or flexible Class 5) with water-swellable yarns/compoundPrevents axial seawater ingress and resists cyclic bending work-hardening
2Triple-extruded WTR-XLPE / EPR systemExtruded conductor screen, water-tree-retardant XLPE or EPR insulation (18/30 kV or 36/66 kV), and bonded insulation screenDry-cured void-free dielectric per IEC 63026 / IEC 60840
3Fatigue-resistant radial water barrierFormed and laser-welded corrugated copper or copper-nickel sheath (or heavy copper wire screen on wet-design EPR)Replaces lead sheaths that crack under 10⁷ floating-platform wave cycles
4Dual interstitial 316L FIMT optical unitsTwo laser-welded stainless-steel FIMT tubes (24 or 48 ITU-T G.652.D fibres each) for SCADA and DTS/DAS fatigue monitoringEnables continuous Distributed Temperature & Acoustic Sensing along the dynamic wave
5Contra-helical dynamic wire armourTwo opposing-lay layers of galvanised high-tensile steel armour wires embedded in bitumen-free polymeric beddingProvides torsional balance and high axial stiffness for hang-off to touchdown zone
6Extruded HDPE outer servingAbrasion-resistant high-density polyethylene (HDPE) outer jacket with yellow warning stripes (replaces polypropylene yarn at bend stiffener)Ensures precise friction fit inside polyurethane dynamic bend stiffeners and buoyancy clamps

DIAC-33 (18/30(36) kV Dynamic Array)

33 kV three-core dynamic submarine cable (95–630 mm²) with wet-aged WTR-XLPE/EPR or corrugated copper screen

DIAC-66 (36/66(72.5) kV Dynamic Array)

66 kV high-capacity three-core dynamic inter-array cable (150–800 mm²) for 12–20 MW floating wind turbines

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 63026 / CIGRE TB 610 / CIGRE TB 722. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U (Um)
18/30 (36) kV & 36/66 (72.5) kV AC
AC routine test voltage
45 kV AC (33 kV) / 90 kV AC (66 kV) for 30 min
Partial discharge at 2 × U0
≤ 5 pC (no detectable discharge)
Impulse withstand (BIL)
170 kVp (33 kV) · 325 kVp (66 kV)
Current rating (3 cores)
285 A (95 mm²) to 920 A (800 mm²) in seawater

Thermal

Max. conductor temperature
+90 °C continuous
Short-circuit temperature
+250 °C (up to 5 s)
Seawater & seabed ambient
−5 °C to +35 °C

Mechanical

Design water depth
50 m to 1,000 m (lazy-wave / tethered-wave)
Fatigue life qualification
≥ 10⁷ bending cycles (25–30 year metocean spectrum)
Min. bend radius (dynamic)
20 × OD (guided by bend stiffener)
Min. bend radius (static)
12 × OD (seabed & carousel storage)
Max. installation tension
120 kN to 450 kN (per CIGRE TB 610)

Optical

Fibre type & count
2 × 24 or 2 × 48 ITU-T G.652.D SM + MM DTS fibres
Attenuation (1310 / 1550 nm)
≤ 0.35 dB/km / ≤ 0.21 dB/km

Resistance

Radial water barrier
Corrugated welded Cu/CuNi sheath (100 % impervious)
Longitudinal water block
Swellable conductor & screen tapes (IEC 60840 Annex G)
Marine growth & abrasion
Extruded HDPE outer jacket for clamp/stiffener zones

Reference standards

Primary FOWT cable standard
IEC 63026
Mechanical & fatigue testing
CIGRE TB 610 / TB 722 / TB 862
Subsea power design rules
DNV-RP-F401 / DNV-ST-0359

Identification

Outer sheath
Black extruded HDPE with co-extruded yellow longitudinal stripes
Phase core identification
Numbered/colour-coded phases 1, 2, 3
Customs tariff (HS)
8544.60

Sizes

14 standard 33 kV & 66 kV dynamic inter-array submarine cable sizes

Typical dimensions, copper weights, weights in air/seawater, ampacities, and maximum pulling loads per IEC 63026.

Dimensions, weights & pulling loads
Order designationCores × mm² + OpticalVoltage
kV		Nominal OD
mm		Copper
kg/km		Weight in air
kg/km		Weight in sea
kg/km		Max pull
kN		Dynamic MBR
mm		Enquiry
33 kV (18/30(36) kV) Dynamic Three-Core Inter-Array Cables
DIAC-33-3X95-48FO3 × 95 mm² + 2×24FO18/30112.03,18021,40011,3001502,240
DIAC-33-3X150-48FO3 × 150 mm² + 2×24FO18/30121.54,76025,80013,9001852,430
DIAC-33-3X240-48FO3 × 240 mm² + 2×24FO18/30134.07,35032,90018,4002302,680
DIAC-33-3X300-48FO3 × 300 mm² + 2×24FO18/30141.59,08037,60021,4002602,830
DIAC-33-3X400-48FO3 × 400 mm² + 2×24FO18/30151.011,96044,50026,1003003,020
DIAC-33-3X500-48FO3 × 500 mm² + 2×24FO18/30160.514,84051,80031,0003403,210
DIAC-33-3X630-48FO3 × 630 mm² + 2×24FO18/30171.018,58060,90037,4003903,420
66 kV (36/66(72.5) kV) Dynamic Three-Core Inter-Array Cables
DIAC-66-3X150-48FO3 × 150 mm² + 2×24FO36/66142.04,92031,80015,6002102,840
DIAC-66-3X240-48FO3 × 240 mm² + 2×24FO36/66154.57,52039,40020,2002553,090
DIAC-66-3X300-48FO3 × 300 mm² + 2×24FO36/66162.09,26044,60023,5002853,240
DIAC-66-3X400-48FO3 × 400 mm² + 2×24FO36/66172.512,15052,40028,6003303,450
DIAC-66-3X500-48FO3 × 500 mm² + 2×24FO36/66182.015,04060,20033,8003703,640
DIAC-66-3X630-48FO3 × 630 mm² + 2×24FO36/66193.518,80070,10040,5004153,870
DIAC-66-3X800-48FO3 × 800 mm² + 2×24FO36/66206.023,68082,40048,9004604,120
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Max pull (kN) represents the allowable installation and extreme storm axial tension with contra-helical steel wire armour per CIGRE TB 610.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
HV AC withstand & partial discharge test2.5 × U0 (45 kV / 90 kV AC) for 30 min + PD ≤ 5 pC at 2 × U0Every manufactured cable length
Sample tests
Conductor & screen longitudinal water penetration testZero leakage under hydrostatic head per IEC 63026 / IEC 60840Sample per production batch
Full-scale dynamic mechanical fatigue + electrical type testCIGRE TB 610 / IEC 63026 combined tension-bending fatigue followed by 20 thermal cycles & BIL impulse testType qualification
Corrugated metallic sheath S-N fatigue curve verificationValidate strain endurance beyond 10⁷ metocean wave cyclesType approval

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

IEC 63026 Floating Offshore Wind QualificationCIGRE TB 610 / TB 722 & DNV-RP-F401 Compliant

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX DIAC 33/66kV DYNAMIC INTER-ARRAY SUBSEA CABLE IEC 63026 [SIZE] [YEAR]
Delivery form
Direct turntable load-out to cable-lay vessel or heavy transport reels
Dynamic accessories
Engineered bend stiffeners, I-tube hang-off clamps, buoyancy modules &タッチdown protection
Monitoring fibres
Pre-terminated DTS/DAS & SCADA optical breakout box
Lead time
Project-scheduled manufacture

Technical documents

Downloads

PDFDynamic Inter-Array Cable – technical datasheet14 sizes · construction, technical data, approvalsXLSXDynamic Inter-Array Cable spec data (Excel)All 14 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why cannot a conventional static seabed array cable with a lead sheath be used on floating offshore wind turbines?
Extruded lead alloy sheaths have low cyclic fatigue endurance and crack rapidly under continuous wave-induced platform pitch, heave, and yaw. Our Dynamic Inter-Array Cable uses a formed and laser-welded corrugated copper or copper-nickel radial water barrier (or wet-qualified EPR/WTR-XLPE screen) qualified to over 10⁷ bending cycles per IEC 63026.
Why does Dynamic Inter-Array Cable use two opposing-lay steel armour layers instead of single-layer armour?
Single-layer armour generates large torsional rotation when subjected to axial tension variations in a lazy-wave catenary, which can cause loops or bird-caging near the seabed touchdown zone. Contra-helical double wire armour balances torsional moment across the full dynamic tension envelope.
Why is an extruded HDPE outer sheath specified instead of bitumen-roving polypropylene yarn?
In the dynamic water column, distributed buoyancy modules, tether clamps, and the hang-off polyurethane bend stiffener must grip the cable exterior with a predictable friction coefficient and tight dimensional tolerance. Extruded HDPE provides a smooth, creep-resistant cylinder and eliminates bitumen washout.
How are the two interstitial 316L FIMT optical units used during wind farm operation?
One 24/48-fibre FIMT carries turbine SCADA, protection inter-tripping, and condition monitoring data, while the second FIMT provides full redundancy and dedicated fibres for Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) to monitor real-time dynamic cable strain and hotspot temperatures.

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