Pole Transformer

Daelim Belefic Single Phase Overhead Transformer is designed and produced normally for stepping utility distribution voltages (ranging from 2400 to 34500 volts) down to lower utilization voltages. Although some are used for stepping down to commercial and industrial voltages such as 277, 240/480, 2400 and 4800, most are used for stepping down to the single-phase voltage of 120/240.


These transformers are also used for small substations, miscellaneous applications and can serve to step up voltages.

Conventional Type Single Phase Transformer

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CSP Type Single Phase Transformer

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The Importance of Cast Resin Dry Type Transformer: The Ultimate FAQ Guide

Transformers come in a variety of shapes and sizes with different functions and purposes. Ranging from very large transformers to very small transformers. When it comes to getting the job done, there is not much of a difference between the power transformers and small ones like the single-phase transformer.


Basically, this means that regardless of the size, transformers do the same thing but depending on your project or purpose of purchasing one, you need to first understand its properties in order to get the right type of transformer.


DAELIM, one of the most prestigious transformer suppliers in the world, is dedicated to serving its clients’ high-quality transformers with fair quotes and the best services, which is why in this article DAELIM will provide you with the necessary information you need before purchasing a pole transformer.

What Is A Transformer?

For starters, a transformer is an electrical device or machine that transforms the value of current and voltages; hence, getting the name “transformer”. There are many types of transformers out there, and you will learn several of them in this article.

Step-up Transformer

A step-up transformer is a transformer that changes lower values to higher values. Step-up transformers are usually used for transmission systems.

Step-down Transformer

Contrary to the step-up transformer, the step-down transformer does the opposite job, wherein it changes higher values to lower values, and they are commonly used in a distribution system.

What Is A Pole Transformer?

So, what type of transformer is a pole transformer? Is it a step-up or step-down?

Pole transformers are actually distribution transformers that are mounted on an electric service pole that could either be wood or concrete. Moreover, they are commonly leveled with the electric wires you see connected with the pole transformer.

Pole transformers range from16 kVA - 100 kVA and they have the capability to transform 11,000 volts - 33,000 volts down to 400 volts, which is very impressive for a transformer that has the size of a barrel.

What are Pole Transformers for?

High power Transformer for Industry.

Pole transformers are used for converting distribution voltage to the 120/240 power system that are used by houses and also low-volume installations. As aforementioned, these transformers have a kVA range of 16 - 100 kVA and easily convert 11,000 - 33,000 V to 400 V.

Inside Of A Pole Transformer

Pole transformers contain a magnetic core that is produced from laminations of silicon sheet steel or otherwise known as transformer steel, that are stacked together. There are also primary and secondary wire windings wrapped around them.

Pole Transformer Connection

Each house has a transformer drum that is mounted to a wooden or concrete pole. For houses that are near each other or suburban neighbourhoods, the distribution wires are located underground with transformer boxes underneath every house.


What these transformers do is reduce 7,200 V to 240 V, this is sufficient for running a normal household with electrical services.

Different Types Of Transformers

Below are the different types of transformers you usually hear from other companies who are considering buying premium transformers for their inventory stocks. You will have a better understanding of the different types of transformers after reading this section.

Core Type Transformers

Core type transformers are commonly used in applications such as for transferring cores, energy and power grids. So, it still has the main function of what transformers do which is the ability to increase and decrease values.


When it comes to their mechanical properties, the core type transformer has two limbs with windings contracted to the core material.

Shell Type Transformer

Shell-type transformers may not be popular but it does not mean that they are not worth considering. They are used for low voltage applications including low voltage power circuits that involve electrical circuits.


Its mechanical components are composed of its core, three limbs, and two windows. For its windings, they are contracted on the center or central limb, in a “one over the other” position. Nonetheless, the arrangement of these windings can be progressed with one limb.

Spiral Core Transformer

The spiral core transformer is considered to be the modern one since it has the latest development in its core construction.


The core is formed in a continuous strip or ribbon form that is somewhat similar to a circular cylinder, hence, getting the “spiral core” for its name. This shape allows its core flux to escort the grain of the iron.

Frequently Asked Questions About Pole Transformers

Below are common questions asked by curious people and interested companies who are planning to invest in pole transformers. This will help you address some concerns as well, so keep in mind the answers to these questions.

Are Pole Transformers Necessary?

Yes, pole transformers help regulate and distribute the right amount of voltage to each house smoothly. Without pole transformers. Moreover, this keeps the electricity flowing consistently to provide homes electricity without getting it cut off.

Do Pole Transformers Contain Oil?

Yes, they do contain oil, distribution transformers like single-phase transformers and pole transformers contain oil for electrical insulation and cooling to the windings inside the transformer.

What Liquid Is In A Pole Transformer?

Single Phase Transformer in Philippines

There is a specialized oil that is specifically made for transformers, thus, claiming its name “transformer oil” that is also referred to as insulating oil. These are used for oil-type transformers, fluorescent lamps, high-voltage switches, and circuit breakers.

Are Pole Transformers Dangerous?

Yes, they can be dangerous and highly flammable. Pole transformers could also fall down, which might hit someone that is just near the pole. When it comes to its voltage, the power lines or wires between the areas could cut off and start to spark in an abnormal way, getting hit by live wires can potentially burn our insides and cause other life-threatening injuries.

Why Do Pole Transformers Explode?

pole mounted transformer
pole mounted transformer

When there is a disturbance or interruption that causes the pole transformer to receive too much electricity, the energy and electricity passing through it gets uncontrolled which results in an explosion and possibly followed by fire.

How Many Houses Are Connected To A Pole Transformer?

Normally, the range of connection between how many houses connected to a single pole transformer varies but it can be connected to up to 50 houses. But for industrial and commercial applications that require high loads of electricity, it can be as low as only 4 to 5 large infrastructures.

How Much Copper Is Inside A Pole Transformer?

The amount of copper in a pole transformer contains about 15% to 20% along with steel materials and core laminations including the insulating oil inside the pole transformer.

Advantages and Disadvantages Of Pole Transformers

In this section, you will learn the advantages and drawbacks of pole transformers. This section helps you give a final verdict on your purchase decision. So, once again, do look into the details that are provided,


If there are any concerns you would like to be assessed, DAELIM is ready to answer them. But before that let us look into its advantages.

Pole Transformer Advantages

Here are the main advantages of using pole transformers.

Excellent Control of Energy

When it comes to controlling of energy transmission, there is without a doubt that pole transformers do a decent job. It is simply well-designed and is the only compact transformer that can-do energy and electricity transmissions on a pole.

Smooth Voltage Transmission

This is the reason why pole transformers can have a lot of wired connections. It has no problems in distributing electricity to all connected houses because of its effective mechanical components that are behind the smooth voltage transmission from house to house.

Highly Efficient

By now you could definitely tell that pole transformers do well. In fact, the place you are living in might even be powered with a pole transformer! A lot of companies tend to use two or three of these because large consumption is enough for 4 to 5 huge buildings already.

Low Cost Compared To Other Transformers

Compared to its other big competitors, pole transformers are fairly priced in the middle. It is compact, low maintenance, and highly efficient. What more could you ask for? It is at the top of the league compared to its alternatives.

Low Maintenance

As mentioned, it requires little to almost no maintenance at all! Have you noticed that electricians rarely visit pole transformers? This is because it has no moving parts inside, and its material is so solid that it can withstand changing temperatures, typhoons, and heavy beating.

Solid-State Device

There are no moving parts whatsoever in pole transformers which is why it is considered as a solid-state device. This means that you have less to worry about, especially random explosions, fire, or electricity cut-offs.

Pole Transformer Disadvantages

Below are the disadvantages or drawbacks of pole transformers.

Has To Be Replaced

Since it has little maintenance and no moving parts inside, you cannot expect that it will stay in pristine condition forever, which means you will have to replace it every 3-4 years or so. Some pole transformers even require yearly replacement.


But with high-quality ones, you do not have to worry about constantly replacing your pole transformers. DAELIM has several pole transformers you can choose from.

Might Fall Off

Since it is mounted to a pole, without checking it every once in a while, pole transformers might get loose and fall off, which is why it is very important that it is installed properly by experts who are responsible for strongly clamping it to where it is mounted.


DAELIM offers low-cost installations for you to not go through that hassle. Rest assured, your pole transformer will never budge with DAELIM’s low-cost installation.

Requires Oil

As mentioned before in a previous section, some pole transformers require oil as insulation. Oil can be quite costly, and you do have to fuel it up every once and a while as well. If this is something you do not want to apply, do reconsider or contact DAELIM for your concerns.


Dangerous Voltage

As you know, there are a lot of power lines or wires connected to a single-pole transformer especially in urban areas. The range could go from 4 to 5 kilovolts. Even at this low voltage, contact with a power line can seriously cause injuries to those who come in contact with it.


This is the reason why live wires can cause injuries that require amputations and even death. The electricity that is that large of an amount is capable of stopping your heart from working. Touching a tree branch that is in contact with the wire can still reach you.


So, whenever there are live wires down connected to a transformer, stay as far away from it.


The pole, wood, or concrete that it is mounted to is usually applied with preservatives that contain harmful chemicals that are dangerous to animals, and humans. These preservatives can cause cancer, complications to our systems, and even birth defects.


So, if ever you are in a case wherein your 2nd floor is near to a transformer, keep the windows closed or wear a mask. These preservatives will eventually fade away after a month or so. Depending on how strong it is.

Stray Voltage

When the insulation that is surrounding old power lines underground degrade, the wires become exposed to the ground or soil, in which stray electrical currents can travel through soil.


YES, electricity can travel through soil. Especially, metal objects on the surface including sheets of metals, utility poles, fire hydrants, etc. Coming in contact with flowing electricity in the ground with your bare feet can cause an electric shock that causes severe injuries.


There have been lots of reports of people and animals dying from stray voltages.


Like with any transformer, pole transformers have their dangers too but this only occurs when there is an interference or an abnormality in its process of transformation probably caused by friction from building walls, animal involvement, strong winds, etc.


For a single electric barrel that is capable of passing energy of up to 50 houses, it is very efficient in its job and with little maintenance, it sustains itself very well.


Should you have further questions and concerns, you may contact DAELIM’s team of professionals who are ready to accommodate.

DAELIM: An Electric Product & Equipment Manufacturer.