Construction, types, and uses of distribution transformers

Distribution transformers manufacturers in India provide transformers under electrical isolation transformers, which modify extended voltage levels to minimal levels. In general, this device steps down the voltage range to almost 240 volts required for households and other small industries. 

The distribution transformer processes an exact path to give isolation in between the windings. To rectify the voltage levels, electrical energy is allowed to pass through these devices. 

It has mainly been implemented for low voltage applications, a minimum of 33 kV, and used as a step-down transformer that is Minimal in size. Processes at either 60-70 percent of the entire weight all over the day. Requires only 3-5 points for the tap charger.

Distribution Transformer Construction

These distribution transformer manufacturers of India designed similarly to that of small-sized transformers. Most of these devices use either E or C-shaped core substances made of either steel straps, laminated sheets, or liquid bones, which are glued. 

The most negligible current and high voltage sides of distribution transformers are protected with copper-coated windings. In contrast, the low voltage and high current sides are protected with resin twisted paper of copper insulated or aluminum. The entire convention is made to join the resin bindings and then drained in a powder-smeared steel tank. 

Later the tank is packed with highly concentrated mineral oil, which is inert in nature and non-conductive. Mineral oil is used to disperse heat and safeguard the device from any destruction on the mineral oil surface. So, to remove moisture, the tank is made to be under pressure, creating arcing. Finally, on the topmost surface of the tank, a gasket is placed to let it be safe from unusual weather conditions.

Types of distribution transformers

Distribution transformers are classified upon factors like

● Mounting position

● Kind of insulation used

● Number of phases it is operated

● Type of voltage level

Few types of distribution transformers are stated as below:

Pole Mounted Distribution Transformers

Distributed transformers are expressed as pole-mounted when the transmission lines are placed above the ground and are of a single phase. These kinds of transformers are primarily utilized for household applications because they can hold the ability to convert the voltage range to 120 or 240 volts.

The smallest size and installation are simplified, and this allows the device to be either mounted on single and dual on pole structures. These Voltage levels range from 11,000 to 33,000 volts.

As these are set nearly 5 meters above the ground, there can be no harm to animals and people who are walking on the ground. These devices can handle difficult atmospheric conditions.

Due to its shape, the transformers can decrease water storage levels. Tanks are made of zinc in coastal locations whereas, in vast corrosive locations, these are constructed of steel material.

Pad-Mounted Distribution Transformers

Distributed transformers are stated as pad-mounted when the transmission lines are situated under the ground. When there is no place for a walled compound, people go with the alternative of executing pad-mounted transformers. 

These have a secured steel closet that is placed on a pad made of concrete material. Because of the Enclosed construction in these devices, there is no access to the internal running parts. The enclosure might consist of isolating fuses, switches, bushings, levers, and others. The voltage levels in this type of device range from 100 – 2000 kVA. A single pad-mounted transformer can fulfill the necessities of many homes, mostly an apartment.

Distribution Transformer Connections

There are different kinds of distribution transformers: single-phase and three-phase.

The connection of this device fluctuates based on the kind of distribution transformer that is used. Single-phase transformers are designed either with one or two bushings, and they are connected in wye shape. These primary bushings can also be utilized with four-wire or three-wire wye connections only when appropriately connected.

And also, these single-phase transformers are connected to the overhead wires in 2 ways, and those are:

Wye: Here, a section to neutral kind of electrical device is used. It’s a high bushing where it’s a reference to either of the phases. The other aspect of the winding is connected to the neutral wire, and it’s grounded. 

A wye association is chosen due to unstable masses that may cause currents within the neutral aspect, and with this connection, those have a direction towards the bottom. Whereas within the delta affiliation, the unstable masses develop voltage variations on the three-phase wires.

Delta: Here, a phase-to-phase kind of electrical device is used. It’s two bushings where these have a reference to 2 of the phases. The other aspect of the winding is connected to the neutral wire, and it’s grounded. 

The disadvantage of this connection is that once any one of the first phases goes below First State energy, the other part can cause current movement in an exceedingly reverse direction, which may severely damage the employees and workers.

Uses of Distribution transformer

A few of the applications of distribution transformer to be mentioned are as follows:

● Distribution transformers are extensively used for household applications While they can be used in pumping stations, separate homes, and farmyards.

● They can be enforced in railway systems high-powered with AC.

● They are used in power collector networks.

● This electrical device changes from high voltage electricity to low voltage electricity, used in homes & businesses.

● The primary function of this can be to step down the voltage to supply isolation between 2 windings like primary & secondary.

● This Distribution transformer distributes the power to remote areas that are generated from the power plants.

● Generally, this electrical device distributes the electricity to industries with less voltage below 33KV and 440 volts to 220volts for domestic functions.


Distribution Transformers manufacturers of India offer two types of distribution transformers. One can be used at tiny houses, and the other transformer can be used at buildings like apartments. Hence, these transformers are helpful for us and help us to make our work easier. These days transformers play an important role everywhere. So, if you install any transformer either for your company or household, choose the best one!