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Medium Voltage (MV) Power Cables are electric power cables designed to operate at voltages ranging from 1 kV (1000 volts) up to 35 kV. They are commonly used in various electrical distribution systems, such as substations, industrial applications, and utility grids. MV cables facilitate the transmission and distribution of electrical energy efficiently and safely.
Construction of Medium Voltage Power Cables
Conductors:
Material: Typically made of copper or aluminum, with copper offering better conductivity while aluminum is lighter and more cost-effective.
Configuration: Conductors can be single-core (one conductor) or multi-core (multiple conductors bundled together).
Insulation:
The insulation material surrounds the conductor to prevent electrical leakage and protect against environmental factors.
Common insulation materials include:
Cross-Linked Polyethylene (XLPE): Provides high thermal resistance and excellent dielectric properties.
Polyvinyl Chloride (PVC): Offers good mechanical properties but is less heat resistant than XLPE.
EPR (Ethylene Propylene Rubber): Used for its flexibility and resistance to heat and environmental conditions.
Inner Sheath:
This layer provides additional protection to the insulation, often made from PVC or similar materials to guard against moisture and mechanical damage.
Armor:
In some cables, an additional layer of armor (steel wires or aluminum) is used to protect against mechanical damage and rodent attacks. This is especially common in direct burial applications.
Outer Sheath:
The outer layer protects the cable from environmental exposure, such as moisture and chemicals. It is typically made from PVC or other durable materials.
Types of Medium Voltage Power Cables
Single-Core Cables:
Used primarily in three-phase systems. They can be installed in different configurations (either in trefoil or flat formations).
Multi-Core Cables:
Contain multiple conductors (three or four) assembled together. They are commonly used in applications where space is limited.
Armored Cables:
These cables have an additional layer of mechanical protection, making them suitable for underground or outdoor installations.
Non-Armored Cables:
Typically used for above-ground or indoor applications where the risk of mechanical damage is lower.
Submarine Cables:
Designed for underwater applications, these cables have enhanced insulation and protection to endure the critical environmental conditions found underwater.
Sizes of Medium Voltage Power Cables
The sizes of MV cables are typically specified in terms of the conductor cross-sectional area, measured in square millimeters (mm²). Common sizes include:
10 mm² / 16 mm² / 25 mm² / 35 mm² / 50 mm² / 70 mm² / 95 mm²
120 mm² / 150 mm² / 185 mm² / 240 mm² / 300 mm² / 400 mm²
500 mm² and larger
The appropriate size of cable to use depends on factors such as the current-carrying capacity required, the length of the cable run (which affects voltage drop), and installation conditions (ambient temperature, installation type, etc.).
1 Core Medium Voltage Power Cable Chart Size
| Nominal Conductor Area | No. and Diameter of Wires | Nominal Diameter of Conductor | Maximum Conductor Resistance at 20ºC | Nominal Weight per km of |
| (mm2) | (no./mm) | (mm) | (0/km) | Conductor (kg/km) |
| 1 | 7 / 0.43 | 1.29 | 18.1 | 9.2 |
| 1.5 | 7 / 0.53 | 1.59 | 12.1 | 14 |
| 2.5 | 7 / 0.67 | 2.01 | 7.41 | 22.4 |
| 4 | 7 / 0.85 | 2.55 | 4.61 | 36.1 |
| 6 | 7 / 1.04 | 3.12 | 3.08 | 54 |
| 10 | 7 / 1.35 | 4.05 | 1.83 | 90.8 |
| 16 | 7 / 1.70 | 4.69 | 1.15 | 145 |
| 25 | 7 / 2.14 | 5.9 | 0.727 | 229 |
| 35 | 7 / 2.52 | 6.95 | 0.524 | 317 |
| 50 | 19 / 1.78 | 8.4 | 0.387 | 429 |
| 70 | 19 / 2.14 | 10.1 | 0.268 | 620 |
| 95 | 19 / 2.52 | 11.9 | 0.193 | 860 |
| 120 | 37 / 2.03 | 13.5 | 0.153 | 1086 |
| 150 | 37 / 2.25 | 14.9 | 0.124 | 1334 |
| 185 | 37 / 2.52 | 16.9 | 0.0991 | 1673 |
| 240 | 61 / 2.25 | 19.2 | 0.0754 | 2199 |
| 300 | 61 / 2.52 | 21.5 | 0.0601 | 2759 |
| 400 | 61 / 2.85 | 24.3 | 0.047 | 3528 |
| 500 | 61 / 3.20 | 27.3 | 0.0366 | 4448 |
| 630 | 127 / 2.52 | 32.76 | 0.0283 | 5744 |
| 800 | 127 / 2.85 | 37.05 | 0.0221 | 7346 |
| 1000 | 127 / 3.20 | 41.6 | 0.0176 | 9260 |
3 Core Medium Voltage Power Cable Chart Size
| No. Cores | Conduct or Cross Sec- tion Area (mm²) | Cable Cross Section Area (mm²) | Actual Armour Cross Section Area (mm²) | Overall Diameter (mm) | Gland Size | Cleat Size | Nominal Weight (kg/km) | Resistance of Copper Conductor (ohm/Km) at 200C |
| 3 | 1.5 | 124.63 | 16 | 12.6 | 20s | 6 | 330 | 12.1 |
| 3 | 2.5 | 156.07 | 19 | 14.1 | 20s | 6 | 390 | 7.41 |
| 3 | 4 | 183.76 | 20 | 15.3 | 20s | 6 | 464 | 4.61 |
| 3 | 6 | 216.31 | 23 | 16.6 | 20 | 7 | 568 | 3.08 |
| 3 | 10 | 298.5 | 39 | 19.5 | 20 | 8 | 866 | 1.83 |
| 3 | 16 | 366.25 | 45 | 21.6 | 25 | 10 | 1152 | 1.15 |
| 3 | 25 | 510.45 | 62 | 25.5 | 32 | 11 | 1800 | 0.727 |
| 3 | 35 | 615.44 | 68 | 28 | 32 | 11 | 2230 | 0.524 |
| 3 | 50 | 637.62 | 78 | 28.5 | 32 | 12 | 2490 | 0.387 |
| 3 | 70 | 813.92 | 90 | 32.2 | 40 | 14 | 3290 | 0.268 |
| 3 | 95 | 1074.67 | 128 | 37 | 40 | 16 | 4440 | 0.193 |
| 3 | 120 | 1281.25 | 141 | 40.4 | 50 | 16 | 5470 | 0.153 |
| 3 | 150 | 1625.15 | 201 | 45.5 | 50 | 18 | 6930 | 0.124 |
| 3 | 185 | 1946.83 | 220 | 49.8 | 50 | 20 | 8350 | 0.0991 |
| 3 | 240 | 2383.27 | 250 | 55.1 | 63 | T9 | 10400 | 0.0754 |
| 3 | 300 | 2844.87 | 269 | 60.2 | 63 | T10 | 12600 | 0.0601 |
| 3 | 400 | 3481.91 | 304 | 66.6 | 75 | T11 | 14600 | 0.047 |
Applications of Medium Voltage Power Cables
Industrial Plants: Used for power distribution in factories and manufacturing plants.
Utilities: Connecting substations to distribution networks and covering medium voltage distribution lines.
Renewable Energy: Connecting wind turbine generators and solar power plants to the grid.
Commercial Buildings: Electrical power distribution in commercial facilities.
Standards and Compliance
Medium voltage cables are manufactured following various international and national standards, such as:
IEC 60502: International standard for power cables with extruded insulation for rated voltages from 1 kV to 30 kV.
IEEE 835: A standard for MV cable construction.
BS 6622: British standard outlining requirements for MV cables.
Medium voltage power cables play a crucial role in the efficient and safe transmission and distribution of electrical energy. Their design, materials, and construction details are tailored to handle specific electrical requirements while maintaining the necessary safety and performance standards. Proper selection of cable size and type is vital for effective electrical network installation and operation. Always adhere to applicable codes and regulations when selecting and implementing these cables.
1. Are you a manufacturer or trading company?
We are a professional manufacturer. We can control your order from the first begining to the last.
Welcome to visit us. We'll pick you up in SHIJIAZHUANG.
2. How can I get a sample to test your quality?
The samples are free for you. New clients are expected to pay for the courier cost.
3. What's your Minimum Order Quantity?
Normally 100m. However, the cable is very heavy.
You'd better order a suitable quantity to avoid the high freight.
Sea transportation is the best option.
4. Can I get a discount?
It depends on your quantity, We can make a discount and afford the freight. Pls kindly contact us for further discussion.
5. Does your company accept OEM production?
Yes, could print your company name, we even custom the quality card to promote your company.
