Looking for a quality HT XLPE cable but not sure what specifications to consider? This article provides a detailed guide about the specifications of XLPE cables in India 2023. It also helps you select the right one for your application.
HT XLPE cables are commonly used for high-voltage applications where electric power is to be delivered over a long distance with high efficiency. However, there are various specifications that you need to consider to select the right cable for your application.
The HL XLPE cables in India are governed by IS: 8130 (1984) and IS: 7098 standards.IS: 8130 (1984) governs the quality of conductors used in the cable. IS:7098 governs the quality of the conductor screen, insulation used, armour and the inner and outer sheath.
Therefore, when buying HT XLPE cable, look for the one confirming these standards.
High Voltage HT XLPE cables are available in different voltage ratings, ranging from 3.3 kV to 33 kV. Apart from this, some manufacturers also produce HT XLPE cables with a voltage rating of 66 kV. Generally, it is advised to use a cable that has a voltage rating higher than your expected load. However, the cost of the cable increases with the increase in the voltage rating. Therefore, it is advised to identify your requirement and select the cable with the most appropriate voltage rating for your application.
Typically, HT XLPE cables are available in 1, 3 or 4 cores. The number of cores you choose will depend on the application and the power requirements of the system. Single-core cables are the most basic type of HT XLPE cables. They are typically used in lighting circuit wiring, multi-core cables are ideal for high-voltage applications. Applications such as power transmission, electrical infrastructures, industrial machinery, agricultural equipment, etc.
When choosing an HT XLPE cable for a particular application, one of the key factors to consider is the type of conductor used.
The conductor of an HT XLPE cable is typically either copper or aluminium, encased in a jacket of insulation. Copper is typically more expensive than aluminium, but it has superior thermal and electrical conductivity. In addition, copper has higher tensile strength and flexibility, which makes it ideal for longer runs of cable. On the other hand, aluminium is cheaper and is suitable for cost-sensitive applications where high efficiency is not of utmost importance.
The size of the conductor is measured in terms of cross-sectional area, commonly expressed in terms of Sq.mm. The larger the size of the conductor, the higher the current carrying capacity and the higher the cost.
Generally, single-core conductors are available in sizes ranging from 35 Sq.mm to 1000 Sq.mm, whereas multi-core HT XLPE cables have a conductor size ranging from 35 Sq. mm to 400 Sq. mm.
Armour is a metal protective covering that provides stiffness and prevents the HT XLPE cable from mechanical damage. Galvanized steel strip armour is commonly used in multi-core cables. However, you can also find aluminium and copper armours for enhanced flexibility.
Apart from protection, armour cables, such as flat-strip aluminium armour also reduce hysteresis losses and improve the efficiency of the cable.
HT XLPE Cables are highly resistant to extreme temperatures, ranging from -50°C up to 150°C. This makes them ideal for applications where temperature fluctuations are common, such as in outdoor applications with extreme temperature conditions.
HT XLPE Cables are incredibly durable and can last up to 50 years without needing replacement. This makes them an ideal option for areas where the cables will be subjected to extreme conditions. This is also ideal where frequent repairs cannot be performed, such as in underground or marine applications.
HT XLPE Cables are rated to operate up to a maximum temperature of 90℃. They can withstand short circuit temperatures of up to 250℃. In addition, these cables are generally flame retardant and self-extinguishing, which minimises the risk of fire.
This makes it ideal for aerospace and other industrial applications where high current capacity is required, without compromising safety.
HT XLPE Cables can transmit high-voltage electrical power over long distances, making them ideal for electricity transmission from one power station to another.
Every XLPE cable has a code that determines its specifications, such as the type of conductor, insulation, armour and outer sheathing used in the cable.
The table below provides information about the different elements of the code.
| Code | Constituent |
| A | Aluminium conductor |
| C | Copper conductor |
| 2X | XLPE Insulation |
| W | Round Steel Armour |
| F | Flat steel strip armour |
| Y | PVC outer sheathing |
For example, an HT XLPE cable with code “A2XFY” has an aluminium conductor, with XLPE insulation, flat steel strip armour and a PVC outer sheathing. Therefore, look for the code and select the best-suited cable for your application.
Apart from that, always look for the cables that comply with the Indian standards for XLPE cables, like IS: 8130 (1984) and IS: 7098. This ensures the safety and reliability of the cable.
HT XLPE cables are specified based on various factors like the type of conductor, number of cores, armour, standards, etc., and selecting the right cable based on these specifications will help you minimise the cost while ensuring efficiency and safety. L&T-SuFin is a leading marketplace in India with a variety of XLPE cables at affordable prices and provides detailed information about their specifications. Have a look.
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