Nepal Sub-site Power Distribution Box Model

Nepal sub-sites typically use 33/11 kV and 132/11 kV distribution boxes integrated with transformers and feeders to manage local electricity distribution.

Overview of Distribution Boxes in Nepal

In Nepal, substation distribution boxes are part of the 33/11 kV or 132/11 kV substation systems, designed to step down high-voltage transmission lines to distribution voltages suitable for residential, commercial, and industrial consumers. These boxes are generally metal-clad or outdoor-type switchgear units that house circuit breakers, busbars, protection relays, and metering equipment. Typical Configurations33/11 kV Distribution BoxesConnected to 33 kV sub-transmission lines from regional substations.

Step down voltage to 11 kV for local distribution. Include incoming and outgoing feeders, protection devices, and metering panels. Often installed in Kawasoti and other growing urban areas to reduce voltage drops and improve reliability.

132/11 kV Distribution BoxesUsed in newly constructed or upgraded substations to handle higher capacity transmission lines. Paired with 132/33 kV or 132/11 kV transformers (e.g., 30 MVA in Kawasoti) to feed multiple 11 kV feeders. Designed to reinforce existing 33 kV lines and reduce outages and transmission losses.

Components and Features

Circuit Breakers: Air-insulated or vacuum circuit breakers for feeder protection. Busbars: Copper or aluminum busbars for power distribution within the box. Protection Relays: Overcurrent, earth fault, and differential protection relays.

Metering: Energy meters for monitoring load and consumption. Feeder Panels: Multiple outgoing feeders to supply local distribution networks. Enclosure: Weatherproof, corrosion-resistant metal housing for outdoor installations.

Implementation and Upgrades

Recent projects in western Nepal involve upgrading existing 33/11 kV substations and constructing new ones with modern distribution boxes to improve grid access, reliability, and efficiency. These upgrades include installation of new 11 kV feeders, distribution transformers, and low-voltage networks to serve both new and existing consumers. Notes on Model SelectionWhile specific manufacturer models are not publicly listed, the design follows NEA and international standards for medium-voltage distribution equipment.

Selection depends on: Voltage level (11 kV, 33 kV, 132 kV)Load capacity and number of feedersEnvironmental conditions (outdoor vs indoor)Integration with SCADA or GIS-based monitoring systems ConclusionNepal sub-sites use standardized 33/11 kV and 132/11 kV distribution boxes integrated with transformers and feeders to manage local electricity distribution. These boxes are designed for reliability, safety, and scalability, supporting both urban and rural electrification projects. For exact model specifications, NEA or project-specific technical documents should be consulted, as they define the detailed equipment selection and configuration for each substation.