Medium Voltage Cable
- According to IEC 60502 and GB Standard
- Approved by GB, ISO, SGS, BV
- Large stock meduim voltage power cable.
Medium voltage power cable is suitable for ground. XLPE material has excellent insulation properties and is firmly spliced with conductor and insulation screens of semiconductor material, so this cable has high reliability. It is suitable for substations, power plants and industrial plants.
Conductor Material: Copper
Conductor Screen: Semi-Conductor Polymer
Insulation Screen: Semi-Conductor Polymer
Metal Screen: Copper tape
Insulation Sheath: PVC
Medium Voltage Cable: A New Standard in Power Transmission
As the world increasingly relies on electricity to power homes, businesses, and industries, the demand for reliable and efficient electrical infrastructure grows. This necessitates new solutions that can handle greater loads while still maintaining safety standards. One such solution is a medium voltage (MV) cable.
A medium voltage cable is a type of power cable used to transmit electrical energy at voltages above3 kV up to 36 kV. Unlike low voltage cables, high voltage cables are not designed to be installed by homeowners or businesses. Instead, they are only installed by qualified electricians and other trained professionals.
As an electrical engineer, selecting the correct medium voltage cable is a critical part of your job. The wrong mv power cables can cause equipment failure, fires, and other dangerous problems. In this article, we’ll look at the different types of highvoltage cable and their applications. We’ll also cover some essential factors when selecting a suitable cable for your next project from the best medium voltage cable manufacturers.
What Is Medium Voltage Cable?
The term “medium voltage” describes high voltage electrical cables that operate at voltages ranging from 3kV to 36kV. Medium voltage cables are typically used in industrial and commercial applications and the utility sector.
Medium voltage cables are manufactured with various insulation materials, including cross-linked polyethylene (XLPE), paper, and oil-filled cables. The most common type of medium voltage cable is XLPE cable, which makes up about 85% of the market. Highvoltage cable is also used in some applications.
Figure 1: Medium Voltage Power Cable
Medium voltage cable is designed to be installed by qualified electricians and other trained professionals. These cables are not intended for use by homeowners or businesses. Medium voltage power cables Come in different conductor sizes (from 14 AWG to 1000 kcmil) and insulation levels ( 5 kV, 11kv,15 kV, 25 kV, and 35 kV). Also, there are three main types of medium voltage cables. Every kind of MV cable has its own unique set of benefits and applications. Single-core and 3-core medium voltage power cables are examples of this category. The majority of the time, the conductor is made from copper or aluminum. Steel tape and steel wire are used to arm the cable.
What Is Medium Voltage Used For?
MV cables are used in various applications, including industrial and commercial settings, as well as in the utility sector.
Figure 2: MV Cables 3.3kV- 36kV
Medium voltage cable is often used in industrial applications, such as manufacturing plants and refineries. These cables are designed to withstand harsh conditions, including exposure to chemicals and high temperatures.
Medium voltage cables are also often used in industrial settings where there is a risk of physical damage. Tray cables, in particular, are often used in these applications.
MV cables are also used in commercial applications, such as office buildings and retail stores. These cables are typically used for lighting and power distribution. Flexible medium voltage cable is often used in these applications to allow easy installation.
Utility sector applications, such as transmission and distribution, make up the largest market for medium voltage cables. These cables transport electricity from power plants to homes and businesses. When selecting MV cables for these applications, medium voltage cable ampactity must be carefully considered.
MV cables are also used in various other applications, including renewables and the military.
Medium voltage cable is used in various renewable energy applications, such as solar and wind. These cables are designed to withstand exposure to the elements and provide reliable power transport.
MV cables are also used in military applications. These cables must withstand harsh conditions, including exposure to extreme temperatures and physical damage.
How To Calculate Medium Voltage Cable Size?
Medium voltage cable sizing is essential to ensure that the cable can safely transport the required electricity. To calculate the size of the medium voltage cable, the following points should be considered:
- Data Collection: The first step in calculating the size of the medium voltage is to collect all relevant data such as cable length and rating, ambient conditions, required load, voltage type, power factor, and the type of conductors required.
- Determine Current Carrying Capacity of Cable: The next step is to determine the current carrying capacity of the cable. This can be achieved by determining the voltage drop and cable reactance, which will give you the required current carrying capacity of the cable. Choose the cable with a greater cross-sectional area to face the minimum resistive losses.
- Determine Voltage Drop: Once the current carrying capacity has been determined, the voltage drop can be calculated by using the following equation:
V = I × R
Where V is the voltage drop, I is the current rating of the cable, and R is the resistance per unit length. Current flow and resistance are the two main reasons of voltage drop.
- Calculate Cable Size: After determining the current carrying capacity and voltage drop, selecting the appropriate cable size is the next step. The most important factor to consider when selecting a high voltage power cable size is the 5kv cable ampacity or current carrying capacity of the cable. The minimum size of the cable for short circuit conditions can be calculated by using the following equation:
A = √(i2t) / k
Where A is the minimum size of the cable, i is the short circuit current, t is the time for the short circuit in seconds, and k is the temperature constant for short circuit.
- Earth fault loop impedance: The earth fault loop impedance should also be considered when calculating the size of the 15kv medium voltage cable. Earth fault protection is important for tripping to avoid any accident. The following equation can be used for calculation:
IA = V0 / Z0
By considering all of the above mentioned factors, you can accurately calculate the size of the medium voltage cable required for your project.
How do I know what size MV cable to buy?
To determine the proper size for your cable, you need to decide which type of medium voltage underground cable is required by law. You also need to know how much energy you will be using and where it will be used to choose a cable with enough capacity.
- The first step is to determine your system’s voltage and amperage rating. You can find this information in your electrical code. You can also check your power bill or contact a licensed electrician to get this information.
- Next, you need to determine what kind of medium voltage cable is required by law in your area. The National Electrical Code requires that all cables be rated and marked with their voltage, amperage ratings, and length. Different regions may have other requirements, so it is essential to check with your local code enforcement office.
- Once you know the voltage and amperage of your system and the type of cable required by law, you can choose a cable with enough capacity. Most MV cables are available in different gauges or sizes. The thicker the gauge, the more electricity it can carry.
- You can also buy cables that are rated for more than one voltage. These cables are called “multi-conductor” or “multi-stranded” cables. They are available in different gauges and have different conductor sizes to accommodate different voltages.
- Finally, you need to decide how long of a cable you need. The length of the cable will determine the price, so it is essential to get the right size. Most cables are available in different lengths, so you can choose the one that best fits your needs.
It is advised that when choosing a medium voltage cable, always consult with a licensed electrician to ensure that you are getting the right size and type of cable for your electrical system.
Medium voltage cable testing is critical to ensure that the cable can safely transport the required electricity. The following tests are commonly performed on MV cables:
High voltage test:
This test is used to determine the dielectric strength of the insulation. The insulation must be able to withstand high voltages without breakdown.
Figure 3: MV Power Cable Testing
Thermal stability test:
This is used to determine the maximum operating temperature of the cable. The medium voltage cable must be able to transport electricity at high temperatures safely.
Ageing test is used to determine the lifetime of the cable. The cable must be able to transport electricity for the specified amount of time safely. It is important to note that the results of the tests may vary depending on the type of medium voltage wire.
So buying the accurate size of MV cable is an important task. You must have all the required information to make a sound decision when selecting an MV wire for your application.
What is the difference between low and medium voltage cables?
The main difference between low and medium-voltage cables is the amount of current they can safely transport. Low voltage cables are designed to safely transport up to 1,000 volts (V), while medium voltage cables can safely transport up to 36,000 V.
Medium voltage cables are also required to have thicker insulation than lv cables. This is because the higher voltages need more substantial insulation to prevent electrical breakdown. The medium voltage cable price list is relatively high compared to low voltage. Cross-linked polyethylene and PVC may both be used to make low voltage cables, with the distinction between cross-linked cables and regular wires made throughout the process. Medium- and high-voltage cables are all produced using cross-linked material with 6kv-35kv produced using three-layer co-extruded, high-density cross-linked polyethylene.
Medium voltage cable is an essential part of the electrical infrastructure. They provide a safe way to transport electricity, but they are also necessary for the power grid. Medium voltage cable suppliers offer a vital service by supplying the MV cables used in the electrical infrastructure.
Having the right supplier is vital to ensure that your required cables are of the highest quality and meet the application’s requirements. As mv cable manufacturers our guide has provided you with all the information to select the suitable medium voltage cable for your application. Of course, if you have any further interrogations, our experts are always here to help. Simply contact us, and we will be more than happy to assist with your high voltage cable specification.