Aerial Bunched Cables (ABC) present an innovative solution for overhead power distribution. When compared to traditional bare conductor systems, ABC offers enhanced safety and reliability, reduced power losses, and overall system economy by lowering installation, maintenance, and operational costs. This system is particularly well-suited for rural distribution and is especially advantageous in challenging terrains such as hilly, forested, or coastal areas.
Furthermore, Aerial Bunched Cables are an excellent option for power distribution in congested urban settings with narrow lanes. In developing urban complexes, ABC stands out due to its flexibility for rerouting in response to changes in urban development plans.
CONSTRUCTION OF ABC
Aerial Bunched Cables are constructed by twisting XLPE/HDPE insulated aluminum power conductors (including a neutral conductor and street lighting conductor when necessary) around a high-tensile galvanized steel messenger wire, which can also be made of aluminum alloy. This assembly is then strung directly onto distribution poles or towers using standard market hardware, ensuring that the messenger wire remains completely insulated from earthing at any distribution point in the case of HT ABC.
The XLPE (Cross-linked Polyethylene) insulation is black and resistant to deterioration from direct sunlight and ultraviolet radiation. XLPE is a cross-linkable low-density polyethylene made thermoset through a specialized formulation from thermoplastic low-density polyethylene. It offers excellent electrical properties and superior thermomechanical characteristics
Materials
- Aluminum conductors comply with IS:8130 (Class-II)
- Standard high-tensile galvanized steel messenger wire adheres to IS:398 (Part 2), or alternatively, aluminum alloy messenger wire conforms to IS:398 (Part 4)
- XLPE and HDPE insulation for power conductors meet the specifications of IS:7098 (Part I & II) and IS:6474, respectively.
- With the introduction of messenger wire, the tension on the current-carrying conductor is completely alleviated, allowing for an operating temperature of 90°C compared to 75°C for a bare conductor of the same size.
Application
Aerial Bunched Cables can be effectively utilized in the following scenarios:
- As a replacement for bare lines in rural areas, forests, and narrow streets where space is limited.
- In situations where the reliability of supply is paramount.
- Where a high level of stability in supply voltage is critical.
- In hilly terrains where the cost of erecting overhead lines or underground cables is prohibitively high.
- To reinforce existing systems without increasing voltage.
- For temporary power supply needs.