Distribution Transformer

Distribution Transformers

Distribution Transformers Manufacturers

Distribution Transformers

Distribution Transformer is an electrical isolation transformer which convert high-voltage electricity to lower voltage levels acceptable for use in homes and business. A distribution transformer’s function is straightforward: to step down the voltage and provide isolation between primary and secondary. Electrical energy is passed through distribution transformers to reduce high-distribution voltage levels down to end-use levels. Nearly all energy passes through at least one distribution transformer before being consumed by an end-use appliance, motor, or other piece of equipment. Distribution Transformers are found in all

A distribution transformer or service transformer is basically a transformer that provides final voltage transformation in an electrical distribution system (of electricity boards or utilities). It does so by Stepping down the Voltageused in the Distribution Lines to the level used by the customer e.g., three phase supply for industrial/commercial use (433V) & single phase supply for domestic/household use(250V) purpose.These are usually low to medium rating transformers (6 kVA to 2500 kVA) They are generally used for auxiliary supply for appliances, lighting, motorized machine and power loads.

A distribution transformer is a transformer that provides the final voltage transformation in the electric power distribution system, stepping down the voltage used in the distribution lines to the level used by the customer. The invention of a practical efficient transformer made AC power distribution feasible; a system using distribution transformers was demonstrated as early as 1882.

If mounted on a utility pole, they are called pole-mount transformers. If the distribution lines are located at ground level or underground, distribution transformers are mounted on concrete pads and locked in steel cases, thus known as pad-mount transformers.

If mounted on a utility pole, they are called pole-mount transformers. If the distribution lines are located at ground level or underground, distribution transformers are mounted on concrete pads and locked in steel cases, thus known as pad-mount transformers.


Distribution transformers are classified into different categories based on factors such as:
  • 1. Mounting location Pole mounted or Plinth mounted
  • 2. Type of cooling / insulation liquid-immersed or dry-type
  • 3. Tapping mode- Off ckt. Tap switch or On load tap changer


  • IS 1180 : 2014 is a reference standardFor Oil immersed Distribution Transformers up to 2500 kVA

    For Distribution transformer mandatory requirements from manufacturer are as listed below-
    Manufacturer must have valid (Renewed) BIS license for manufacturing of a particular rating. Manufacturer must have valid Type Test Certificate & its inclusion endorsement by BIS in License of a particular rating to sale in a market.

    NOTE- For any standard rating of distribution transformer (with IS 1180:2014) if manufacturer manufactures & sales a particular rating WITHOUT valid Type Test Certificate & its inclusion endorsement by BIS, then it amounts for breach of BIS guidelines of License & criminal offence as per Gazette.


    • Application

      In Distribution network of MSEDCL or Private substations

    • Tech Specification

      Standard ratings& Specs as per IS 1180:2014 with latest revision.