At present, discovering a convenient as well as a suitable area for installing a distribution transformer is one of the main challenges faced by the distribution company. Especially in urban areas, it is severe so power departments need to plan for an appropriate place for installation by considering the load, load center, possibility and further development, etc. This type of transformer can be arranged on a single pole or H pole based on the size, weight, and requirements of the transformer. Accordingly, the choice for installation of this transformer can be done by the distribution company depending on the capability and availability of space.


1. What is a Distribution Transformer?

Definition: A distribution transformer is also known as a typical kind of isolation transformer. The main function of this transformer is to alter the high voltage to the normal voltage like 0,24/0,12KV to use in electric power distribution. In the distribution system, there are different kinds of transformers available like single phase, 3-phase, underground, pad-mounted, pole-mounted transformer.

A distribution-transformer - SANAKY brand

Generally, these transformers are available in different sizes with efficiencies along with insulating oil. These transformers are available in various sizes and efficiencies. The selection of this transformer mainly lies in the requirement and budget of the user. There are four types of distribution transformer connections available like star-star, delta-delta, star-delta, delta-star and Zig Zag/delta zigzag.

Distribution Transformer Construction

The designing of a distribution transformer can be done similarly to small size transformers. The main parts of this transformer mainly include Main Tank, Conservator, Buchholz Relay, Breather, Oil Level Indicator, Thermometer, Pressure Pressure Relief Vale, Winding Temperature Indicator, Radiator, and Bushing.

  • The main tank is used to soak the windings by placing it in.
  • A conservator is arranged above the oil tank at the outside of the transformer frame. It is connected to the main tank with the help of a metallic tube. The oil within the tank can be easily contacted and enlarge throughout loading so that the temperature of the oil can be increased and decrease.
  • Buchholz relay is used when a conservator tank is used. Because it indicates errors like loss of oil once it goes low, improper flow of oil between the tank and transformer.
  • Breather includes silica gel that absorbs moisture in the oil. It changes its color from blue color to pink color it is not capable to absorb moisture in the oil.
  • The Oil Level Indicator indicates the level of the oil within the conservatory unit.
  • The Thermometer monitors the temperature of the oil. If the temperature of the oil increases to a certain level then the transformer will be disconnected from the service.
  • Pressure Relief Valve decreases the pressure within the transformer to avoid an explosion of the transformer.
  • The Winding Temperature Indicator is used as an indicator for the temperature of the winding
  • The Radiator is used to increase the transformer’s cooling efficiency.
  • The bushing is used to connect the internal windings of the transformer with the help of an exterior electrical network.

I. Types of Distribution Transformer

Based on the application or requirement, these transformers are categorized into different types like single phase, three phases, underground, pad-mounted, pole-mounted transformers.

  1. Single-phase Transformers

A Single-phase Amorphous transformer – SANAKY BRAND

Those types are specially used for networks wherever a three-phase supply is not required. Usually, Single phase Transformer are not only used for repairing overhead distribution loads in residential, but also applicable in industrial lighting, light commercial loads and power applications. 

2. Three Phase Transformers

A Three-phase Amorphous Transformer – SANAKY BRAND

Three-Phase Distribution Transformers are usually used to hold electrical energy from the main distribution circuit to a minor distribution circuit. Technically, they could transmit the current to a secondary distribution circuit as well as the voltage of the primary distribution circuit. Moreover, three phase transformers could also reduce the voltage supply for the primary circuit based on the consumer requirement.

Their voltage always changes and can be dissimilar for the users of commercial, residential and light industry. Therefore, These transformers could work on different levels of voltage and frequency based on the standards existing in different countries. 

3. Pad-Mounted Transformers

A Pad-mounted Transformer

Those type of transformer includes a locked steel cupboard that is arranged on a concrete pad and they are mostly placed where they do not have space for a fenced enclosure. 

Also Pad-mounted transformer are used with electric power distribution lines at an overhead electrical line for reducing the primary voltage to supply for the customers since a single transformer of this type can serve many homes/a large building. The power rating of this transformer ranges from 75kVA to 5000kVA and includes fixed switches and fuses.

4. Pole Mounted/Single-phase Transformer

A Pole-Mount Amorphous Transformer – SANAKY BRAND

As also called Single-phase transformer in many coutnry, these transformers are mounted on an electrical service pole at the height of the overhead cables because of being small size and easy to fit on single-pole structures. 

Nowaday, they are used for changing high distribution voltage to low like 120/240 volt power. These transformers type are mostly used in a wide rural area, ranges from 16kVA to 100kVA, becauseTthey are reliable to harsh climates when being used in remote areas.

II. Distribution Transformer Applications

The uses of the distribution transformer include the following.

  • Distribution transformer changes from high voltage electricity to low voltage electricity, suitable in useing in homes and businesses.
  • The main function of this is to step down the voltage to provide isolation between two windings like primary and secondary
  • This transformer distributes the power to remote areas which are generated from the power plants
  • Generally, this transformer distributes the electrical energy to industries with less voltage under 33KV and 440volts to 220volts for domestic purpose
  • The tank of these transformers can be shaped and protected from the corrosive materials and accumulation of water. In coastal areas, tanks can be protected from zinc sprays whereas, in highly corrosive regions, stainless tanks are used. 

As Distribution transformer is one of the key product of Sanaky Vietnam Co.,Ltd or Song Hong Viet Branch of Sanaky, Our company is proud to be a manufacturer and supplier of top quality transformers, electrical cabinets - power stations in Vietnam with more than 11 years of experience in the field of researching and manufacturing transformers with a team of highly qualified staff and employees, modern technological equipment and machinery, the company's products and services have long been highly appreciated by the Viet Nam market.

With the business motto: "Leading Technology and Manufacturing", customers coming to SANAKY will always receive highest quality products, reasonable prices ,fastest delivery time as well as the best warranty service.

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SANAKY VIETNAM., CO LTD- Manufacturer of Chest Freezer - Upright Cooler, Transformer, RO Water Purifier...
☎ Hotline: (+84) 986 494 554
Email: hank@sanaky-vn.com
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