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Product

IEC 62895 LN2 3-phase HTS power cableIEC 62895 & IEEE 172610–110 kV AC · 43 to 572 MVASubcooled LN₂ (67–77 K) · Tri-Axial

Three-Phase HTS Power Cable10–110 kV AC (43–572 MVA) subcooled liquid-nitrogen tri-axial three-phase HTS power

High-capacity three-phase High-Temperature Superconducting AC power transmission cable (Three-Phase HTS Power Cable) built to IEC 62895 and IEEE 1726 with concentric Tri-Axial (or 3-in-1 Triad) REBCO 2G HTS phase layers, liquid-nitrogen-impregnated PPLP.

Low-EMC design
EMC screen
Water-resistant
Approved
Order designation
HTS-3P-TriAx-10kV-2.5kA
Cryostat Ø
125.0 mm
Rated I_rms
2.5 kA
Capacity
43 MVA
Min. bend R
1,800 mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Rated voltage
10 to 110 kV AC
10 / 24 / 35 / 66 / 110 kV grid
Phase current
2.0 to 4.0 kA
43 MVA to 572 MVA in 1 duct
Architecture
Tri-Axial / 3in1
concentric L1/L2/L3 + Cu screen
Cryogen
Subcooled LN₂
67–77 K at 0.3–1.5 MPa pressure
Dielectric
Lapped PPLP
LN₂-impregnated polypropylene
Cryostat OD
125 to 185 mm
double corrugated 316L + MLI

Typical values for this cable type, based on IEC 62895 / IEC 61788-26 / IEEE 1726 / CIGRE TB 538 — confirmed in the datasheet and quotation for your order.

Application fit

Is Three-Phase HTS Power Cable right for your machine?

Allows utilities and heavy industry to transmit 100–500 MVA of power at medium voltage (10–35 kV) or high voltage (66–110 kV) through a single Ø 125–185 mm duct without step-up/step-down EHV transformers, zero external magnetic field and 50 % less HTS tape than three separate single-phase cores.

TBM gantry & advancing tunnel reel

Suitable

Installed in congested urban utility tunnels, existing 150–200 mm underground ducts and bridge crossings where EHV trenching is.

Fixed installation

Suitable

Interconnects urban bulk substations, hyperscale AI data-centre campuses, steelworks and railway traction substations.

Immersion & wet locations

Suitable

Cooled by closed-loop subcooled liquid nitrogen (LN₂ at 67–77 K, 3–15 bar) pumped through the central former and cryostat annulus.

Typical machinesUrban Medium-Voltage Bulk Substation Interties (10–35 kV)Hyperscale Data-Centre & AI Campus 100+ MW FeedersSteel Mill, Aluminum & Chemical Plant High-Current TiesCongested Utility Tunnels & EHV Transformer Bypass Links

Construction

Layer by layer

Shown: HTS-3P-TriAx-10kV-2.5kA (10 kV, 2,500 A rms, 43 MVA) concentric Tri-Axial three-phase HTS cable with hollow corrugated stainless-steel LN₂ former, concentric Phase 1 / PPLP / Phase 2 / PPLP / Phase 3 REBCO 2G HTS helical tape layers, copper earth screen and vacuum-insulated double corrugated 316L cryostat.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Concentric Phase L1, L2 & L3 REBCO 2G HTS tape layersHelically wound 4 mm wide REBCO 2G HTS coated-conductor tapes with matched pitch anglesCancels net magnetic flux outside Phase L3 (I₁ + I₂ + I₃ = 0) and halves required HTS tape vs. 3 separate
2Central hollow corrugated stainless-steel LN₂ former +Spiral corrugated AISI 304L/316L tube (ID 35–45 mm) + stranded copper fault-currentCarries forward subcooled LN₂ flow and absorbs 25–40 kA short-circuit fault current
3Lapped Polypropylene Laminated Paper (PPLP) cryogenicMulti-layer lapped PPLP tapes impregnated under pressure by subcooled liquid nitrogenDelivers > 50 kV/mm impulse breakdown strength and zero partial discharge in pressurized LN₂
4Concentric copper neutral / earth fault screenHelical copper tapes over outer PPLP dielectricCarries zero-sequence and short-circuit earth fault current
5Double corrugated AISI 316L vacuum-superinsulatedInner LN₂ containment pipe + 30–50 layers vacuum MLI (< 10⁻⁵ mbar) + outer corrugatedLimits ambient thermal ingress to < 1.5–2.0 W/m while allowing standard cable-drum pulling

Concentric Tri-Axial 3-Phase HTS (10 kV to 35 kV · 2.5–4.0 kA)

All three phases wound concentrically on one former — smallest OD and lowest HTS tape usage

3-in-1 Triad Cold-Dielectric HTS (66 kV to 110 kV · 2.5–3.0 kA)

Three individually HTS-shielded cores cabled inside a common LN₂ cryostat for HV grid voltages

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 62895 / IEC 61788-26 / IEEE 1726 / CIGRE TB 538. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated system voltage (U₀/U) & BIL
6/10 kV (75 kV BIL) · 14/24 kV (125 kV) · 20/35 kV (170 kV) · 64/110 kV
Continuous 3-phase AC current & power
2,000 A to 4,000 A rms (43 MVA at 10 kV up to 572 MVA at 110 kV)
Rated short-circuit fault current
25 kA to 40 kA symmetrical for 0.5–1.0 s (carried by parallel Cu
50/60 Hz AC cryogenic loss
< 0.5 to 1.2 W/m per phase at rated current

Thermal

Subcooled liquid nitrogen (LN₂) window
67 K inlet to 77 K outlet at 0.3 to 1.5 MPa (prevents nitrogen bubble
Thermal cycling & overload stability
Verified thermal ageing and short-circuit withstand per standard

Mechanical

Overall outer diameter (including PE
125 mm (10 kV Tri-Axial) to 185 mm (110 kV Triad)
Minimum installation bending radius
1.8 m to 2.8 m (15 × cryostat OD) on Ø 4.2 m transport drums

Resistance

External stray magnetic field (EMF)
Virtually zero (0 µT at 1 m) due to concentric Tri-Axial / HTS-shielded
Environmental & chemical durability
Resistant to moisture, industrial fluids and service ageing

Reference standards

Governing HTS grid cable standards
IEC 62895 (HVDC/AC HTS), IEEE 1726, IEC 61788-26 & CIGRE TB 538
Factory QA & material compliance
EN 10204 3.1 routine test certificate · RoHS 2 & REACH compliant

Identification

System scope
Supplied with outdoor/indoor LN₂ HV terminations, field splice joints &
Customs tariff (HS)
8544.60

Sizes

6 standard Three-Phase LN₂-cooled HTS AC power transmission cable models

Concentric Tri-Axial (10–35 kV) and 3-in-1 Triad (66–110 kV) liquid-nitrogen HTS grid cables.

Architecture, voltage, current, MVA capacity & cryostat OD
Order designationDesignVoltage · PowerCryostat Ø
mm		Rated I_rms
kA		3-Phase S
MVA		Min. bend R
mm		Enquiry
Concentric Tri-Axial 3-Phase Medium-Voltage HTS Grid Cables (10 kV to 35 kV)
HTS-3P-TriAx-10kV-2.5kA3-Phase Concentric REBCO10 kV AC · 43 MVA125.02.5431,800
HTS-3P-TriAx-10kV-4.0kA3-Phase Concentric REBCO10 kV AC · 69 MVA135.04.0692,000
HTS-3P-TriAx-24kV-2.5kA3-Phase Concentric REBCO24 kV AC · 104 MVA142.02.51042,100
HTS-3P-TriAx-35kV-3.0kA3-Phase Concentric REBCO35 kV AC · 182 MVA156.03.01822,300
3-in-1 Triad Cold-Dielectric High-Voltage HTS Grid Cables (66 kV to 110 kV)
HTS-3P-3in1-66kV-2.5kA3-in-1 Triad REBCO Cores66 kV AC · 286 MVA168.02.52862,500
HTS-3P-3in1-110kV-3.0kA3-in-1 Triad REBCO Cores110 kV AC · 572 MVA185.03.05722,800
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Drum lengths of 300 m to 600 m are joined with low-loss (< 20 nΩ) cryogenic field splices for multi-kilometre routes.

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
Cryostat helium mass-spectrometer vacuum test (< 10⁻⁵ mbar) & 77 K I_c test100 % vacuum integrity and critical current margin verified on drumEvery drum length
Sample tests
CIGRE TB 538 / IEC 62895 20-cycle load-cycling, HV AC & lightning impulse test in LN₂Zero partial discharge (≤ 5 pC) before and after 15 × OD bending & fault-current shotsCable + termination + joint system

Inspection certificate

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

Product approvals

IEC 62895 & IEEE 1726 HTS Transmission CompliantCIGRE TB 538 Pre-Qualification TestedISO 21013 Vacuum-Insulated Cryostat Certified

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

Embossed on outer PE jacket: TEBAOFLEX 3-PHASE HTS CABLE <kV> <kA> LN2 CRYOGENIC HIGH VOLTAGE
Delivery form
Non-returnable fumigated wooden or steel drums
Standard lengths
250 m · 500 m · 1000 m standard drums
MOQ
250 m (stock sizes) · 500 m (custom)
Lead time
3–5 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFThree-Phase HTS Power Cable – technical datasheet6 sizes · construction, technical data, approvalsXLSXThree-Phase HTS Power Cable spec data (Excel)All 6 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.

How does a Concentric Tri-Axial three-phase HTS cable save 50 % of the superconducting tape compared to three single-phase cores?
In a conventional 3-in-1 Triad HTS cable, each of the three phase conductors requires its own equal-current superconducting return shield to block eddy-current heating in the steel cryostat (6 superconducting layers total). In a Concentric Tri-Axial cable, Phases L1, L2 and L3 are wound coaxially on a single former separated by lapped PPLP insulation. Because the three balanced phase currents sum vectorially to zero (I₁ + I₂ + I₃ = 0), their magnetic fields self-cancel outside Phase L3 without needing three separate superconducting return shields.
Why is the liquid nitrogen pressurized and subcooled (67–77 K at 3–15 bar) instead of boiling at 1 bar?
If liquid nitrogen were allowed to boil into nitrogen gas bubbles inside the high-voltage PPLP insulation, the lower permittivity and lower breakdown strength of gas bubbles would trigger partial discharge. Pressurizing subcooled LN₂ above 3 bar keeps it 100 % single-phase liquid along the entire cable route.
What happens to a Three-Phase HTS Power Cable during a 25–40 kA grid short-circuit fault?
When fault current exceeds the critical current of the REBCO tapes, the superconductor transitions to its normal resistive state within milliseconds and automatically commutates the fault current into the parallel copper stabilizer layers, riding through the 0.5–1.0 s breaker clearing time without damage.
What factory routine tests and certificates are supplied with Three-Phase HTS Power Cable?
Every production drum of Three-Phase HTS Power Cable undergoes 100 % conductor DC resistance measurement at 20 °C, high-voltage AC/DC dielectric withstand testing, and dimensional verification per IEC 62895 / IEC 61788-26 / IEEE 1726 / CIGRE TB 538, supplied with an EN 10204 3.1 inspection certificate.

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Three-Phase HTS Power Cable

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