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66 kV HV Power Cable
66 kV HV Power Cable
38/66 kV XLPE Insulated Power Cable
Dynamic Cables' 66 kV HV Power Cable is built with XLPE insulation, copper or aluminium conductors, an extruded semiconducting screen system, metallic screening and sheathing for reliable underground power transmission.
Designed and type tested to applicable requirements including IS 7098 Part 3 and IEC 60840, the cable is intended for utilities, substations, renewable energy evacuation, industrial power networks and high voltage transmission and distribution projects.
Um 72.5 kV
Conductor Rating
Insulation System
IS 7098 Part 3
3C × 300 sq mm sample
1C × 630 sq mm sample
Applicable Standards
| Standard / Reference | Application |
|---|---|
| IS 7098 Part 3 | Cross linked polyethylene insulated thermoplastic sheathed cables for working voltages from 66 kV up to and including 220 kV. |
| IEC 60840 | Extruded insulation power cables and accessories for the applicable high voltage range. |
| IS 8130 / IEC 60228 | Conductor construction and Class 2 compacted circular stranded conductors. |
| IEC 60287 | Reference for calculation of cable current rating where applicable. |
| BIS Licence | Dynamic Cables Limited licence CM/L-8400157711 covers the IS 7098 Part 3 product; the supplied endorsement dated 28 March 2026 extends validity to 30 March 2029. |
Construction
The supplied technical documents show tested 66 kV cable constructions using copper or aluminium conductors, XLPE insulation, semiconducting screens, water blocking and metallic sheathing. Construction varies by cable configuration and project specification.
| No. | Layer / Component | Description |
|---|---|---|
| 1 | Conductor | High conductivity copper or aluminium, compacted circular stranded conductor manufactured as per IS 8130 and IEC 60228. The supplied documents include a 1C × 630 sq mm aluminium RTRC test sample and a 3C × 300 sq mm CPRI test sample. |
| 2 | Conductor Screen | Extruded semiconducting screen over the conductor. |
| 3 | XLPE Insulation | Cross linked polyethylene, dry cured insulation providing dielectric and thermal performance. |
| 4 | Insulation Screen | Extruded semiconducting layer forming part of the screened insulation system. |
| 5 | Water Blocking | Water swellable tape / longitudinal water blocking arrangement where specified by the tested construction. |
| 6 | Metallic Screen | Copper wire screen with copper tape binder in the supplied cable construction; provides an earth fault current path and electrical screening. |
| 7 | Metallic Sheath | Corrugated aluminium sheath in the 1C × 630 sq mm RTRC tested construction. |
| 8 | Outer Sheath | Thermoplastic polyethylene / HDPE outer sheath with graphite coating in the supplied test constructions. |
Features
- Continuous conductor operating temperature of 90°C
- Emergency overload capability up to 130°C under applicable operating limits
- Short circuit conductor temperature capability up to 250°C
- Low dielectric losses compared with conventional solid dielectrics such as PVC and EPR
- Low charging currents, allowing closer setting of protection relays
- Triple extrusion construction for a void free insulation system
- Water blocking arrangement for longitudinal moisture control where specified
- Metallic screen for fault current return and electrical screening
- Corrugated aluminium sheath in the supplied 1C × 630 sq mm tested construction
- Suitable for direct burial, duct, tray and tunnel installation where the selected construction permits
- Suitable for utility substations, high voltage transmission and distribution and renewable energy evacuation applications
Technical Information
Reference Product Range
| Rated Voltage | 38/66 kV |
|---|---|
| Highest System Voltage | 72.5 kV |
| Conductor | Copper or aluminium, compacted circular stranded |
| Documented Tested Sizes | 1C × 630 sq mm aluminium in RTRC report; 3C × 300 sq mm in CPRI report |
| Insulation | XLPE, dry cured |
| Conductor Temperature | 90°C continuous; up to 130°C emergency; up to 250°C short circuit |
| Metallic Sheath | Corrugated aluminium in the supplied 1C × 630 sq mm RTRC construction |
| Outer Sheath | HDPE / thermoplastic polyethylene in supplied test constructions |
| Standards | IS 7098 Part 3, IEC 60840, IS 8130 / IEC 60228 |
Single Core 66 kV(E) XLPE Cable with Corrugated Aluminium Sheath
Technical dimensions and electrical reference values reproduced from the supplied EHV-DCL technical sheet, specified as per IS 7098-3.
| Nom. Area (sqmm) |
Min. Thickness of Conductor Screen (mm) |
Nom. Thickness of Insulation (mm) |
Min. Thickness of Insulation Screen (mm) |
Nom. Thickness of Al Sheath (mm) |
Nom. Thickness of Outer Sheath (mm) |
Approx. Overall Diameter (mm) |
Approx. Capacitance (mF/km) |
Approx. Charging Current (A/km) |
Short Circuit Rating — Aluminium (kA) |
Short Circuit Rating — Copper (kA) |
|---|---|---|---|---|---|---|---|---|---|---|
| 240 | 0.8 | 11 | 0.8 | 1.7 | 2.80 | 66.0 | 0.19 | 2.20 | 22.6 | 34.3 |
| 300 | 0.8 | 11 | 0.8 | 1.7 | 2.80 | 68.0 | 0.20 | 2.40 | 28.2 | 42.9 |
| 400 | 0.8 | 11 | 0.8 | 1.7 | 3.00 | 72.0 | 0.22 | 2.60 | 37.6 | 57.2 |
| 500 | 0.8 | 11 | 0.8 | 1.7 | 3.00 | 75.5 | 0.24 | 2.90 | 47.0 | 71.5 |
| 630 | 0.8 | 11 | 0.8 | 1.7 | 3.20 | 79.0 | 0.26 | 3.10 | 59.2 | 90.1 |
| 800 | 0.8 | 11 | 0.8 | 1.7 | 3.40 | 86.5 | 0.30 | 3.60 | 75.2 | 114.4 |
| 1000 | 0.8 | 11 | 0.8 | 1.7 | 3.40 | 90.0 | 0.32 | 3.80 | 94.0 | 143.0 |
Single Core 66 kV(E) XLPE/Armoured Cable with Poly-Aluminium & Copper Wire Screen
Technical dimensions and electrical reference values reproduced from the supplied EHV-DCL technical sheet, specified as per IS 7098-3.
| Nom. Area (sqmm) |
Min. Thickness of Conductor Screen (mm) |
Nom. Thickness of Insulation (mm) |
Min. Thickness of Insulation Screen (mm) |
Nom. Area of Copper Screen (sqmm) |
Min. Thickness of Inner Sheath (mm) |
Nom. Dia. of Aluminium Armour Wire (mm) |
Nom. Thickness of Outer Sheath (mm) |
Approx. Overall Diameter (mm) |
Max. Capacitance (Nom) |
Max. Charging Current (Min) |
Short Circuit Rating — Aluminium (kA) |
Short Circuit Rating — Copper (kA) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 240 | 0.8 | 11 | 0.8 | 209 | 1.10 | 2.50 | 2.20 | 64.0 | 0.19 | 2.20 | 22.6 | 34.3 |
| 300 | 0.8 | 11 | 0.8 | 209 | 1.10 | 2.50 | 2.36 | 66.5 | 0.20 | 2.40 | 28.2 | 42.9 |
| 400 | 0.8 | 11 | 0.8 | 209 | 1.20 | 2.50 | 2.36 | 68.5 | 0.22 | 2.60 | 37.6 | 57.2 |
| 500 | 0.8 | 11 | 0.8 | 209 | 1.20 | 3.15 | 2.52 | 73.0 | 0.24 | 2.90 | 47.0 | 71.5 |
| 630 | 0.8 | 11 | 0.8 | 209 | 1.20 | 3.15 | 2.68 | 76.5 | 0.26 | 3.10 | 59.2 | 90.1 |
| 800 | 0.8 | 11 | 0.8 | 209 | 1.30 | 3.15 | 2.84 | 84.0 | 0.30 | 3.60 | 75.2 | 114.4 |
| 1000 | 0.8 | 11 | 0.8 | 209 | 1.40 | 3.15 | 2.84 | 88.0 | 0.32 | 3.80 | 94.0 | 143.0 |
Testing, Certification & Compliance
BIS Licence
Licence CM/L-8400157711 covers Dynamic Cables Limited for cross linked polyethylene insulated thermoplastic sheathed cables under IS 7098 Part 3. The supplied endorsement dated 28 March 2026 extends the licence validity to 30 March 2029.
CPRI Test Report
The supplied CPRI report dated 21 July 2022 covers a 38/66 kV XLPE insulated EHV power cable system with a 3C × 300 sq mm tested sample. The report includes conductor, insulation, screen, sheath, water penetration and electrical tests.
RTRC Test Report
The supplied Rajasthan Test & Research Centre report covers a 1C × 630 sq mm, 38/66 kV corrugated aluminium sheath cable sample and records conformity observations against the referenced requirements.
Documented Test Areas
- Conductor resistance and examination
- XLPE insulation thickness, tensile strength and elongation
- Semiconducting screen properties
- Outer sheath properties and dimensions
- Water penetration / water tightness testing in the relevant CPRI construction
- Partial discharge and high voltage electrical tests in the CPRI report
- Impulse withstand and power frequency voltage tests in the CPRI report
- Visual and dimensional conformity checks in the RTRC report
Frequently Asked Questions
What is a 66 kV HV power cable and where is it used?
A 66 kV HV power cable is an underground XLPE insulated high voltage cable used for bulk power transmission and distribution between grid substations, renewable energy sites, industrial facilities and major load centres.
What insulation material is used?
The supplied documents describe XLPE insulation, with the tested constructions using a screened insulation system and dry cured XLPE.
What standards does the cable comply with?
The supplied product documents reference IS 7098 Part 3, IEC 60840 and IS 8130 / IEC 60228. The BIS licence supplied for Dynamic Cables covers IS 7098 Part 3.
What are the conductor temperature ratings?
The product draft specifies 90°C continuous conductor operation, up to 130°C for emergency overload conditions and up to 250°C during short circuit conditions.
What conductor sizes are available?
The supplied product draft gives a broader reference range, while the supplied test reports document specific tested constructions including 1C × 630 sq mm aluminium and 3C × 300 sq mm. Final available sizes should be confirmed from the applicable product datasheet.
What is the role of the metallic screen?
The metallic screen provides electrical screening and an earth fault current path. The supplied constructions include copper wire screen with copper tape binder.
What is the purpose of the corrugated aluminium sheath?
In the supplied 1C × 630 sq mm RTRC construction, the corrugated aluminium sheath provides the metallic sheath function and contributes to moisture protection and mechanical protection.
Is the cable suitable for renewable energy projects?
The supplied product draft identifies renewable energy evacuation as an application, including wind and solar projects connecting to grid or pooling substations.
Can I get a datasheet and quotation?
Yes. Use the Request Quote or Contact Us options to submit project requirements and request the applicable datasheet and commercial offer.
Are the CPRI and RTRC test results for every cable size?
No. The supplied reports relate to their respective tested samples. The CPRI report covers a 3C × 300 sq mm sample and the RTRC report covers a 1C × 630 sq mm sample.
Downloadable Documents
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