Medium Voltage Cable
Medium Voltage Cables are electrical cables designed to transmit electrical power at medium voltage levels, typically between 1 kV and 69 kV. They are commonly used in power distribution networks to connect power substations to transformers, distribution panels, and other electrical equipment. Medium Voltage Cables are constructed with copper or aluminum conductors and insulation materials such as cross-linked polyethylene (XLPE) or ethylene propylene rubber (EPR) to ensure safe and reliable transmission of electrical power. They come in various types, including armored or unarmored, single or multi-conductor, and can be installed underground, underwater, or overhead.
Benefits of Medium Voltage Cable
Efficient Power Transmission
They are designed to efficiently transmit electrical power over long distances with minimal loss. This makes them ideal for use in power distribution networks, where electricity must be transmitted from power plants to homes, businesses, and other consumers.
Reliable Performance
Medium Voltage Cables are designed to withstand harsh environmental conditions, such as temperature changes, moisture, and mechanical stress. They are also tested to ensure that they can maintain their performance over a long service life, which helps to prevent power outages and other disruptions in electrical service.
Safe Operation
They are designed to meet strict safety standards to ensure that they do not pose a hazard to people or property. They are typically insulated with materials that provide excellent electrical insulation and are resistant to fire, which helps to prevent electrical fires and other accidents.
Versatile Applications
Medium Voltage Cables can be installed in various environments, including underground, underwater, or overhead. They are also available in different types, such as armored or unarmored, single or multi-conductor, which makes them versatile and adaptable to different applications.
Cost-Effective
Cost-effective in terms of initial installation and long-term maintenance costs. They are designed to last, which means they don’t need to be replaced or repaired very often.
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Types of Medium Voltage Cables
Single-Core Cables have a single conductor and are suitable for use in applications that require high voltage transmission over long distances. They are available in different insulation materials such as XLPE and EPR and can be used in underground and overhead installations.
Three-Core Medium Voltage Cables have three conductors and are commonly used in power distribution networks. They are suitable for use in applications that require the transmission of three-phase electrical power.
Screened Cables have a layer of insulation surrounding the conductor, followed by a layer of conductive material, such as copper wire braid or aluminum tape, that serves as a shield. They are used in applications that require protection against electromagnetic interference (EMI) and radio frequency interference (RFI).
Armoured Medium Voltago Cables have a layer of steel wire or steel tape armor that provides mechanical protection and helps to prevent damage due to external stress. They are suitable for use in harsh environments, such as underground or underwater installations.
Key Difference Between MV Cable and HV Cable
Now that we have explored the fundamental characteristics of both MV and HV cables, let’s highlight the key difference between MV cable and HV cable, that set them apart:
Voltage Range
MV Cable: Operates within the range of 1 kV to 36 kV.
HV Cable: Operates within the range of 36 kV to 550 kV.
Applications
MV Cable: Suited for medium-voltage applications, such as secondary distribution networks, industrial facilities, and renewable energy projects.
HV Cable: Designed for long-distance power transmission, connecting power generation facilities to substations and distribution networks.
Insulation Materials
MV Cable: Employs materials like XLPE and EPR, offering good dielectric properties.
HV Cable: Utilizes specialized insulation materials, often paper-oil, to withstand extreme electric stress.
Conductor Materials
MV Cable: Typically uses copper or aluminum conductors based on application requirements.
HV Cable: Also employs copper and aluminum conductors, with a focus on suitability for lengthy transmission lines.
Metallic Shielding
MV Cable: May or may not include metallic shielding, depending on the specific application and requirements.
HV Cable: Often incorporates metallic shields like lead or aluminum to manage electric field stresses.
Complexity
MV Cable: Generally features simpler cable structures.
HV Cable: Tends to have complex cable structures to ensure safety and reliability over long distances.
Distance of Transmission
MV Cable: Primarily used for relatively short-distance transmission within localized areas.
HV Cable: Specialized for the transmission of electricity over extensive distances, often spanning hundreds of miles.
What Are MV Cables Made Of
Conductor
This is made of either copper or aluminum to allow the electrical current to pass through the cable. Class 1 solid, Class 2 stranded (circular, circular compacted, sectorial)
Conductor screen
A semiconductive layer which helps maintain a uniformly divergent electric field and contains the electric field within the core
Insulation
Typically made of XLPE (Cross-linked Polyethylene) or EPR (Ethylene Propylene Rubber)
Insulation screen
Another semiconductive layer that protects against electrical interference, and also prevents the cable from causing electrical interference
Metallic screen
Copper wire or tape is wrapped around the core, or individual cores. This provides additional insulation and prevents electromagnetic interference
Outer sheath
This layer wraps around the entire cable to provide protection against environmental hazards. Typical materials used for an outer sheath on an MV cable include LDPE, MDPE (Low/Medium Density Polyethylene), PVC (Polyvinyl Chloride), and LSZH (Low Smoke Zero Halogen)
MV Cable Sizes
Our 10kV, 11kV, 20kV, 22kV, 30kV and 33kV cables are available in the following cross-sectional size ranges (depending on Copper/Aluminium conductors). Larger sizes are often available upon request.
|
10kV single core |
35mm2 to 500mm2 |
|
10kV 3-core |
35mm2 to 240mm2 |
|
11kV single core |
50mm2 to 1000mm2 |
|
11kV 3-core |
35mm2 to 400mm2 |
|
20kV single core |
50mm2 to 500mm2 |
|
20kV 3-core |
35mm2 to 630mm2 |
|
22kV single core |
50mm2 to 630mm2 |
|
22kV 3-core |
50mm2 to 500mm2 |
|
30kV single core |
50mm2 to 500mm2 |
|
33kV single core |
70mm2 to 1000mm2 |
|
33kV 3-core |
50mm2 to 400mm2 |
Within a power grid, medium-voltage cables serve to supply a region with electrical energy. Although they are integral parts of a power grid, medium-voltage cables are not used for national electricity exchange since they maintain voltage levels between the high-voltage network and the house installation. Larger electricity consumers, such as industrial companies, hospitals, large swimming pools and larger radio towers, usually have their own medium-voltage cables within the company's own transformer station. Since traction power networks have a grid between 15kV and 25kV, there is also a medium voltage line in use. Large systems, such as cranes or conveyor systems also require medium-voltage cables to supply power due to the increased energy requirement. With these large systems, voltage needs to be increased so that a lower current can be carried within the same cable, which means that the nominal conductor cross section can be reduced. However, in comparison to a fixed installation power network, these types of applications require energy to travel via moving parts. Therefore, flexible cables and carriers that can travel long distances are essential because the medium-voltage cables within these applications must be designed to handle permanent movement.
Conductor
It conducts electricity. Cable's core. Class 2 conductors are electrolytic copper or high-purity electrolytic aluminum.
Internal semiconductor screen
It wraps the conductor. It improves conductor surface electric field dispersion.
Insulation
The strong electric field within MV cables makes insulation crucial. With increasing cable-rated voltage, material and insulation thickness determine a cable's maximum voltage. Medium Voltage cable insulating materials:
Crosslinked polyethylene (XLPE)
High modulus Ethylene-Propylene (HEPR)
Ethylene-Propylene (EPR)
External semiconductor
Covers insulation fully. This insulation-contact substance is cross-linked. Peelable semiconductors partly bonded to insulators simplify connection preparation.
Metal screen
Medium-voltage wires touch the external semiconductor with a metal screen. Copper fibers helically wrap the cable's circumference in this screen.
Protection against water (only -ol and -2ol type cables)
A strip of hygroscopic material beneath the sheath prevents water from propagating longitudinally in type-OL cables. Double-sealed cables have hygroscopic wires on the conductor (type -2OL).
Inner sheath (only for armoured cables)
All armored cables have an armor pad between the metal screen and the armor. The inner and outer sheaths are the same material.
Armour (only for armoured cables)
Armors protect cables from external attacks. All mechanically aggressive installations should employ them. The inner sheath has metal wires or strips for armor. Single-core cables utilize aluminum.
Outer sheath
This outer layer shields the wire from mechanical and chemical damage. Its homogeneous, crimson coating is impermeable, weatherproof, and resistant to knocks and abrasions. PVC and halogen-free polyolefins are used.
Installation of Medium Voltage Cables
Preparation of Cable Route
This involves the planning and preparation of the cable route to ensure the successful installation of medium voltage cables. The route should be cleared of any obstacles, such as trees, rocks, or other barriers that could hinder the installation process. The route should also be surveyed to identify any underground utilities that may be in the way of the cable. It is important to obtain any necessary permits and permissions before beginning work on the route.
Cable Pulling
This involves the actual installation of the cable along the designated route. The cable is usually pulled through conduits or trenches using specialized equipment, such as cable pulling machines or winches. Care must be taken during the pulling process to avoid damaging the cable, and to ensure that it is properly supported and protected throughout its length.
Termination and Jointing
Once the medium voltage cables has been installed, it must be terminated at both ends using special connectors that provide a reliable and secure connection. Jointing is also necessary when splicing together two or more cables. Termination and jointing require specialized skills and tools, and should only be performed by trained professionals to ensure the safety and reliability of the installation.
Testing
The installed cable must be tested to ensure that it is operating properly and meets all relevant safety and performance standards. Testing may include insulation resistance testing, voltage withstand testing, and other specialized tests to verify the quality and reliability of the installation. Any issues identified during testing must be addressed promptly to ensure that the installation is safe and reliable.
Testing and Maintenance Medium Voltage Cable
Factory testing
Factory testing of cables is conducted to ensure that the manufactured cables meet the required standards and specifications before they are shipped for installation. This includes a series of tests such as the conductor resistance test, insulation resistance test, partial discharge test, and voltage test. These tests are designed to verify the electrical properties of the cable, the quality of the insulation, and the overall integrity of the cable construction.
On-site testing procedures
On-site testing procedures are carried out after cable installation to ensure that the cables are not damaged during transportation and installation. These tests include the insulation resistance test, sheath test, and high-potential (Hi-Pot) test. The Hi-Pot test is particularly important as it involves applying a high voltage to the cable to ensure that the insulation does not break down under operating conditions.
Preventive maintenance
Preventive maintenance of medium voltage cables involves regular inspections and testing to detect any potential issues before they lead to cable failure. This includes visual inspections, thermal imaging to detect hot spots, and partial discharge measurements. These proactive measures help in extending the life of the cables and ensuring reliable power distribution.
Fault location and repair
When a fault occurs in a medium voltage cable, it is crucial to quickly locate and repair the fault to minimize downtime. Techniques such as time-domain reflectometry (TDR), which sends a signal along the cable and measures reflections to identify the location of the fault, are commonly used. Once the fault is located, the damaged section of the cable is repaired or replaced, and then the cable is re-tested to ensure it is functioning correctly.
Our Factory
Shaanxi Woquan Trading Co., Ltd. was established in 2016, specializing in the manufacture of cables and wires. The company built and expanded 80 acres (53,333 square meters) of factory buildings and new production line equipment. The company has more than 20 professional and technical personnel.
Our company is a professional wire and cable manufacture integrating research and development, production, sales, and services together. We specialize in developing and manufacturing PVC and XLPE insulation cables, building wires, power cables, armored cables, solar cable, silicone cables, rubber cables, specialty cables. At the same time, customized services of various special cables for customers in appreciated. Our products have certificated by CE, UL, SAA, ISO, TUV, CCC, and other certificates.
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As one of the leading medium voltage cable manufacturers and suppliers in China, we warmly welcome you to wholesale cheap medium voltage cable for sale here from our factory. All customized products are with high quality and low price. Contact us for quotation and free sample.
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