Power Transformer and Distribution Transformer

Daelim brand 220kv,110kv, and 69kv 66kv low-loss series transformer is our independently developed new generation of transformers on the basis of absorption of China and foreign advanced technology, which features low local discharge, low loss, high reliability, strong protection against abrupt short circuit.


The performances of model S9-M, S10-M, S11-M 10kv-35KV series full-sealed oil-immersed distribution transformes conform to Standards IEC IEEE. Its core is made of quality cold-rolled silicon sheet and is of a full-miter non-puncture structure and its coil is made of quality oxygen-free copper.

Distribution Transformer

35KV Three Phase Oil-Immersed Distribution Transformer

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20KV Three Phase Oil-Immersed Distribution Transformer

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10KV Class Three Phase Oil-Immersed DistributionTransformer

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Power Transformer

110KV Class Three Phase Two Winding OLTC /NLTC Power Transformer

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110KV Class Three Phase Three Phase Three Winding OLTC/NLTC Power Transformer

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66KV Class Three Phase Three Phase Two Winding OLTC/NLTC Power Transformer

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

There are different types of transformers available in the market that come in various sizes, but basically, they all have the same purpose, which is to regulate the electricity of buildings to prevent electrical disruptions.


Back in the early days, there were only two types of transformers, which were the Step-up transformer and the Step-down transformer. The step-up transformer can only increase voltage values while the step-down only decreases voltage values.


So, which transformer is right for your neighborhood or company? Depending on what your purpose is, it is essential that you understand transformers first before you make a purchase decision.


With DAELIM’s help, you will be ensured with the right information to sustain your transformer needs.

Are Transformers Necessary?

Yes, transformers are considered to be very important. In fact, without transformers our electrical energies would not be regulated, controlled, and passed to our houses. You can think of transformers as the root of the tree, and power lines as its branches.


Transformers are responsible for the basic components of both transmission and distribution of electricity in a power system. Without a transformer, the absence of it would pose a risk of electrical disruption or uncontrollable voltage that could cause an explosion and fire.


One of the main functions of a transformer is to regulate the voltage, this is why it is necessary to have one in your building (depending on the size).

What Are Transformers Used For?

power transformer station and the high voltage electric pole

Transformers are responsible for regulating the electricity of buildings to prevent electrical disruptions and hazards. They keep the electrical currents flowing from house to house and power generator to power generator.


Compared to the past, there are now transformers that can be used to increase and decrease the voltage at the power generating station. This is to lessen the transmission losses during the process.


The increase in voltage is called step up while the decrease in voltage is called step down. With both purposes to supply power to the building.


In other forms of application that consist of different voltages, transformers are of great help because they can adjust the voltage to a compatible level for the appliance to work.


An example of this is that when a specific appliance requires a specific amount of voltage, and when the voltage is not at the right level, it will simply not operate. With the use of a transformer, adjusting the voltage can be easily done. Resulting in a fully functional appliance with the right amount of voltage.

The Three Different Types of Transformers

There are other types of Transformers as well that serve their unique purposes. Should you require more information after this section, we can get you professional help here.

Core Type Transformer

Core type transformers are usually used as energy transformation, transfer cores, and power grids.


It still serves its main function when it comes to electrical transformer applications, which is to step up transmission and step down transmission.


For its components, the core type transformer has two limbs, and the windings are contracted on two limbs of the core material.

Shell Type Transformer

Shell type transformers are commonly used for low voltage applications and in low voltage power circuits including electrical circuits.


For the components of the shell-type transformer, its core has three limbs and two windows. Both windings are contracted on the central limb specifically, one over the other.


The arrangements of these windings can also be done with one limb.

Spiral Core Transformer

The spiral core transformer employs the latest development in core construction.

Its components consist of the following: its core has three limbs and two windows. Both windings are contracted on the central limb specifically, one over the other.

What Is A Power Transformer?

Power transformers are used to transmit electricity to any component of the electrical circuit between distribution circuits (primary) and the generator it is connected to. These transformers are usually utilized in distribution networks to adjust voltages.


In other words, power transformers convert electricity to both higher and lower voltage values for specific purposes. In power grids, it is considered as a major component to supply voltage to its connections.


Its destination is to supply voltages to the connections that are linked with the power transformer.

What Are Power Transformers Used For?

Power transformers are primarily used for increasing low AC voltages at high current but it can also be used to decrease high AC voltages at low current in electric power applications.

How Do Power Transformers Work?

The core of transformers direct to the path of the magnetic field between its primary and secondary coil to not waste energy. The moment that the magnetic field comes in contact with the secondary coil, it forces electrons to go along with it.


Which results in creating electric currents through electromotive force.

What Is A Distribution Transformer?

As there are two sets of winding, one is called the primary winding and the other one is called secondary winding.


When you energize the primary winding, a magnetic flux is created which is the same flux that links to the secondary winding.

When Were Power Transformers Invented?

It all started back in the 1880s , but in terms of the property of induction, it was found in the 1830s, and this became the standard operating basis of a transformer. After years and years of development, transformers were modified, upgraded, and developed into different types. From large transformers, small and more efficient transformers were invented for total convenience.


Moreover, the potential of transformers grew as kVA and mVA came into existence, A 400KV electrical power transformer was invented at a high level voltage electrical network back in the year 1950. For transformers that supported mVA, the 1100 mVA came into existence in the early years of 1970.


Power increased as years went on, and so did the modification of the various types of transformers.

How Are Power Transformers Designed?

The power transformer’s design is composed of metal that is covered by stainless steel sheets. It is either fixed into a shell type or core type. In terms of its structures, they are contracted, this employs conductors to produce three one-phase transformers or one three-phase transformer.


Three one-phase transformers require each of its banks isolated from the extra parts, this provides continuous service in case one bank malfunctions. On the other hand, a single three-phase transformer, whether the core or shell type, will not function.

This is why the three-phase transformer is cost-effective in terms of production, with a lower carbon footprint and better operation with higher efficiency.

Its structure is molded in a fire retardant-specific fluid inside a tank. The conservatory on top of the tanks enables the moving oil to cover it totally. The charger of the load’s responsibility is to drain the side of the tank for optimal voltage adjustment.

For its bushings, its bushings enable other parts of the tank to enter and exit the system without coming in contact or damaging the outer shell. Power transformers can be operated even beyond its low rating as long as it is within the right temperature. Specifically 65ºC.

These transformers do have special fans that help cool the transformer for operating below the specified temperature.

Power Transformer Working Principles

In today’s generation, electrical energy in low-voltage ratings has been considered too cost-effective. This low-voltage rating can be transferred to another receiving section, causing more line wastes.


But if the voltage rate is increased or improved, you can expect that the current of the power will be decreased, resulting in a reduction in ohmic or I2R wastes in the networks. This also enhances the voltage adjustment in the system, but because of this, it is required to step it up for effective electrical power applications because of the lower-rating power it is in.


This is operated on a step-up device at the specialized sending section of the power network. However, large voltage power may not be distributed to its users directly, which requires it to be stepped down at a suitable rate, with the help of a step-down device on the receiving end.


This is why electrical transformers are important because they play a vital role in transmission cases.


Two winding transformers are usually applied when there is a high level voltage or low that is higher than 2. This is cost-effective to apply an transformer that is automatic where the level between high and low voltage is lower than two,


This is why it is important to keep in mind that three-phase transformers or only one unit of it is more efficient than three single-phase transformers in a three-phase network. However, one simple three-phase set can cause complications, which should be stopped immediately if this case happens.

What Are Distribution Transformers?

distribution transformer in ecuador
distribution transformer in ecuador

Distribution transformers provide the final voltage transformation in the electric power distribution system, which requires it to step down the voltage in the distribution lines to the level that is used by consumers.

In other words, it performs the last voltage transformation in a distribution grid. Converting the voltage used in transmission lines that is compatible with common households and commercial uses.

Difference Between Power Transformers and Distribution Transformers

With a closer inspection, power transformers and distribution transformers have their similarities, differences, and uniqueness. Power transformers are commonly applied in a full load since it is designed to have high efficiency at a full load.


On the contrary, distribution transformers also have high-efficiency applications if the load is half or filled up 70%. Meaning, it is not advised to operate distribution transformers at full loads.


Power transformers are known to lead to large voltages during an adjustment, whether a step-up or step-down. Their windings have better insulation compared to distribution transformer windings. Since they employ high-levels of insulation, you can expect it to be enormous and heavy.


Also, it is worth mentioning that power transformers are typically not connected to houses directly. This results in small load fluctuations every now and then. For distribution transformers, they experience heavy loads.


These are loaded daily, so the iron and copper wastes occur often. The flex density for power transformers is also greater than that of the distribution types.

Applications for Both Transformers

distribution transformer application
distribution transformer application

These are the common applications for distribution transformers:

Chemical Industries

It is very common for chemical industries to use distribution transformers as their choice of transformers because its design is built to be environmentally friendly and less flammable compared to oil-type transformers.


As you know, chemical industries are exposed to dangerous elements and fire hazards, which is why the best choice for them is distribution transformers.


Forests are highly risky because they are prone to fire, which can easily spread out at a very fast rate. For industries that are near forests or high-risk fire areas, they use distribution transformers in order to prevent fire.


distribution transformers are commonly used substations as well as this is more suited for the area because of its safer mechanical components.

Residential Complexes

Since there are a lot of buildings in residential complexes, the risk of using oil-type transformers is just too high to be applied in residential complexes. A fire could easily start and could spread easily.


The same goes with villages, as this can also be dangerous for the people living in close distances.

Large Buildings

Large buildings are known to always choose distribution areas because they prefer an environmentally-friendly transformer around.


When it comes to apartments, distribution transformers do an excellent job at regulating the circuits in apartments, and it is simply more reliable than oil type transformers


There are similarities and characteristics both the power transformer and distribution transformer share, which can be very complicated when making a purchase decision, but rest assured both transformers are at the top of its tier


However, if you have questions and concerns, we highly encourage you to ask DAELIM for professional help. The team would gladly help you assess those.

DAELIM: An Electric Product & Equipment Manufacturer.