Extra High Voltage Cable

Extra High Voltage (EHV) cables are designed for electrical transmission systems operating between 110 kV and 500 kV.
They are essential for moving large amounts of electricity efficiently across medium to long distances, typically inside cities, across regions, and in critical infrastructure projects.

500 Meters(MOQ)
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Product Description

Product Advantage

Improved Durability with top quality manufactured insulation ensuring full compliance with industry standards, designed to withstand extreme temperatures, moisture and physical harms
RRH Cable we have the capability to manufacture grade A 99.9% pure copper precisely stranded in the insulators for the best conductivity and efficiency
Thanks to our expert craftsmanship, we provide high-quality cables that minimize the need for frequent maintenance or replacements, significantly reducing long-term operational costs.

Extra High Voltage Cable

Technical Parameters

Size (mm²)	AWG/kcmil	Voltage Class	Ampacity (A)	Insulation	Armor	Shielding	Conductor Material	Core Type	# Conductors	Temp Rating (°C)	# Strands
240 mm²	500 kcmil	110–220 kV	600–800 A	XLPE / Oil-PILC	Optional (SWA)	Copper wire screen	Copper / Aluminum	Single Core	1C	90/130/250	61–91
400 mm²	750 kcmil	110–230 kV	800–1000 A	XLPE / Oil-PILC	Optional (SWA)	Copper wire screen	Copper / Aluminum	Single Core	1C	90/130/250	91–127
630 mm²	1250 kcmil	220–330 kV	1000–1300 A	XLPE / Oil-PILC	Optional (SWA)	Copper wire screen	Copper / Aluminum	Single Core	1C	90/130/250	127+
800 mm²	1600 kcmil	220–400 kV	1200–1400 A	XLPE / Oil-PILC	Optional (SWA)	Copper wire screen	Copper	Single Core	1C	90/130/250	127–169
1000 mm²	2000 kcmil	330–500 kV	1400–1700 A	XLPE / Oil-PILC	Optional (SWA)	Copper wire screen	Copper	Single Core	1C	90/130/250	169–200

Key Points

Armor Steel Wire Armor (SWA) optional for underground or mechanical protection.
Shielding Copper wire/tape screen around conductor and insulation to manage high voltage electric fields.
Insulation XLPE (modern dry type) or Oil-impregnated paper (PILC) for historical and special cases.
Core Type Generally single-core for EHV due to electrical field management; three-core cables rare at these voltages.
Stranding Multi-stranded (61–200 strands) to increase flexibility, reduce skin effect losses.
Temperature Ratings 90°C (continuous), 130°C (overload), 250°C (short-circuit, 5 sec).

Product Uses

Regional Power Transmission carries high volumes of electricity from major power plants to urban and industrial centers.
Urban Underground Transmission replaces overhead lines in cities where space is limited and aesthetics matter.
Renewable Energy Integration transfers wind, solar, and hydro power from generation sites to the main grid.
Substations Interconnection connects major substations to improve grid reliability and flexibility.
Industrial Megaprojects supplies heavy industries, data centers, and special economic zones needing very high power.
Airport and Metro Systems powers large transport systems efficiently without visible infrastructure.

Product Operate Guide

Apply cable base on its insulation property
Always de-energize the system before working on cables
Proper PPE duing operation

Key Features

Feature	Why It Matters
Rated for 110 kV to 500 kV	Enables large-scale power transmission across cities, regions, and industrial areas efficiently.
XLPE Insulation or Oil-Impregnated Insulation	Handles extreme electrical stresses safely, ensuring long life and system stability.
Copper or Aluminum Conductors	Provides excellent electrical conductivity and balances weight, cost, and performance.
High-Strand Conductor Design	Improves flexibility, eases installation, and minimizes skin effect losses.
Metallic Screen/Shielding	Controls the electric field, prevents partial discharge, and enhances safety.
Armored and Unarmored Options	Provides mechanical protection for underground, submarine, or exposed installations.
Water Blocking Layers	Prevents moisture ingress, extending the life of underground cables.
Single-Core or Three-Core Options	Adapts to specific installation needs (single-core for high current; three-core for compact routing).
High Temperature Ratings (90°C Normal, 130°C Overload, 250°C Short-Circuit)	Ensures reliable operation even during high demand or fault conditions.
Design Life: 30–50 Years	Reduces maintenance and replacement costs, ensuring long-term investment value.