ELECTRIC, WITH AN EDGE
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ELECTRIC, WITH AN EDGE
Nowadays, one of the most in-demand electrical devices is the single-phase overhead distribution transformer due to their good performance in distributing electricity to residential, commercial, and industrial areas.
So, why are single-phase distribution transformers worth considering?
In this article, you’ll know the single-phase pole-mounted transformer wiring diagram and the different single-phase pole-mounted transformer sizes.
With the professional help of DAELIM, a company that has been manufacturing single-phase overhead distribution transformers for decades, you will be able to fully understand what single-phase distribution transformers are capable of and make a wise purchase decision.
In general, single-phase overhead distribution transformers are oil-filled transformers that belong to the classification “distribution transformers”, which are transformers that are designed for providing electricity to residential areas with distribution loads.
More about distribution transformers below.
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Before we through the characteristics of single-phase overhead distribution transformers, it is best to be informed about distribution transformers in general first so that you will not be confused as we go deeper into the article.
In addition to the details above, distribution transformers are also commonly used for industrial lighting and multiple power applications since they are designed to be compatible with light commercial loads that do not require too much power or electricity for distribution.
Like the different single-phase pole-mounted transformer sizes, distribution transformers also come in a variety of sizes.
Don’t be surprised to see distribution transformers that are of the size of a small car because high-power-rated distribution transformers can be enormous.
But distribution transformers can be as small as a barrel as well.
For instance, those barrel-liked-shaped electrical devices that you see on utility poles in public are called single-phase overhead distribution transformers.
But despite the variety of sizes of these transformers, they have the same working principle and the same function but with a different power rating, which means that they have dissimilar capabilities as well.
Speaking of working principle, as aforementioned, regardless of what shape or size your distribution transformer has, they all have the same working principle which is to transform the value of voltage and current.
This can be done by changing the values of the voltage or current from lower values to higher values or vice-versa.
This type of process is commonly done by step-up transformers, which is a type of transformer that is capable of increasing or “stepping up” the value of the voltage or current from low to high.
This type of electrical transformer is commonly used in transmission systems.
On the other hand, for distribution systems, this system usually uses a step-down transformer, which as the name suggests, decreases the value of the current or voltage.
In simpler terms, it changes the values from high to low.
Those are basically the fundamentals of what distribution transformers do, and it is necessary to involve this since single-phase overhead distribution transformers belong to this category of transformers.
Furthermore, this will help you differentiate the difference between the numerous types of transformers in the market.
In a distribution transformer, it is expected that you will find three elements.
The metalcore, the primary winding, and the secondary winding.
The way this works is that the voltage will be applied through the primary winding and taken off of the secondary winding.
As there is being voltage being applied to the primary winding, the resulting current will then create a current that is expected to create a magnetic field or the core that induces a voltage in the secondary winding.
The ratio between the number of turns in the primary winding and the number of turns in the winding will be the one responsible for determining whether or not the voltage that is being induced in the secondary has a low or high value than the voltage being applied in most distribution transformers.
The voltage that will be induced by the secondary winding is expected to be lower than the voltage that is being applied to the primary winding.
For step-down transformers, it is expected that one end of the primary winding is grounded with a tap coming off the center of the primary winding that is also grounded.
The result of this will lead to one primary coming into the transformer, but with two secondary leads.
In addition to that, there will be a ground that will come out of the transformer.
Eaton’s Cooper Power series single-phase conventional overhead transformers are designed for exceptional performance.
Available in ratings from 5-167 kVA, the transformers are designed with an interlaced core (5-50 kVA), which is recommended by the Electric Power Research Institute (EPRI).
Conventional transformers meet or exceed the requirements of applicable ANSI and NEMA standards.
Single-phase overhead transformers can be filled with standard electrical grade mineral insulating oil or fire-resistant Envirotemp FR3 fluid.
Single-phase overhead distribution transformers are commonly mistaken as pole-top transformers, and no, they may look and function the same but there is a significant difference between the two.
Basically, the difference between the two is that single-phase overhead distribution transformers only have one large bushing while pole-top transformers have two.
What the second bushing does is that it connects the primary winding instead of having the other end of the primary winding grounded through the transformer housing.
The majority of pole-top transformer is being grounded through the secondary bushing.
Both single and double bushing transformers perform the exact same job, but the difference is their appearance due to the extra bushing pole-top transformers have.
There are cases that the load demand and equipment are being used by another customer to acquire the use of a three-phase transformer in an overhead system.
Three single-phase transformers can be connected together to form a pre-phase transformer.
Although not all are located overhead or above-ground in areas that have underground distribution system pads that are mounted.
This is known as a common method of installing transformers.
Three-phase transformers can be housed or enclosed in a housing that has the shape of a metal cabinet that is sitting on a concrete pad, and all connections of the transformers are being concealed within the cabinet. Some might have the shape but with different sizes.
Inside you will be able to find the primary bushings and the secondary bushings.
Although underground setups are not that common, a lot of companies use this type of setup too.
In fact, there are many underground distribution systems out there that are subsurface transformers.
Subsurface transformers are basically transformers that are specifically made to be compatible with the underground installation.
In constructed vaults for protection in shape subsurface transformers that resemble single-phase pole-top transformers.
However, the setup of this involves both the primary windings and secondary windings located on top of the transformer housing.
All of the transformers mentioned can be found in distribution systems.
As mentioned, you will be able to recognize single-phase overhead distribution transformers easily since they have this cylindrical housing shape.
For starters, they have a large primary bushing that is on top of the housing, and there are three secondary bushings that can be found on the side of the housing.
This is the most common form of single-phase overhead distribution transformers.
Both the primary and secondary bushings are responsible for insulating the transformer leads as they are flowing through the enclosure.
The role of the primary winding in this transformer is being supplied with the distribution voltage that is coming from a distribution line on the pole primary voltage is being applied to a lead that is running through the primary bushing to one end of the primary winding.
The other end of the winding is being tied to the transformer’s housing, and the external ground is applied.
The secondary or also known as utilization voltage that is induced in the secondary winding is tapped off the transformer through leads that pass through the secondary bushings on the side of the housing.
A common set of this is that the middle bushing of the secondary side is being grounded, and the leads to the other side are known as the secondary leads that are usually connected to wires to form a secondary bus which applies consumers with electricity through what is known as “service drops”.
To identify a single-phase overhead distribution transformer, see to it if the electrical device that you are looking at has a large primary bushing on top that is connected to a distribution line.
The next step in identifying single-phase overhead distribution transformers is to see if there are smaller secondary bushings on its enclosure.
Lastly, see to it if the wires that are coming from a second bushing is forming a secondary bus and service and service drop going to the customer.
These are the best ways to identify a single-phase distribution transformer.
When it comes to single-phase pole-mounted transformer sizes, there are plenty of sites out there that you can choose from.
But nothing too much that it is hard to install.
DAELIM offers a variety of sizes for their single-phase distribution transformers.
So, if you are looking for a specific size, do not hesitate to contact DAELIM for professional advice.
When it comes to single-phase pole-mounted transformer sizes, there are plenty of sites out there that you can choose from.
But nothing too much that it is hard to install.
DAELIM offers a variety of sizes for their single-phase distribution transformers.
So, if you are looking for a specific size, do not hesitate to contact DAELIM for professional advice.
Speaking of DAELIM single-phase transformers, DAELIM’s single-phase distribution transformers are popularly known to be of top quality and are capable of proving the best performance with failure rates that are close to zero.
Built with advanced quality from experts, the single-phase overhead distribution transformers of DAELIM ensure optimum performance and reliability when it comes to its operation.
If requested, the single-phase overhead distribution transformers can be filled with a premium insulating fluid of your choice for safety precautions and environmental protection.
Fluid may be the most recommended fluid to be used for cooling, but you can choose to use another type of fluid that is sustainable and cheap for less expense.
As long as it is effective and just as good as transformer oil or mineral oil.
In summary of the benefits of single-phase overhead distribution transformers, below are the main advantages of single-phase distribution transformers, including but are not limited to:
As mentioned above, you do have the option to use other types of liquid for safety purposes.
If you are planning on purchasing oil that is for insulating, make sure that it is compatible with single-phase distribution transformers since incompatibility can cause serious complications to the electrical device.
All of DAELIM’s single-phase overhead distribution transformers are manufactured to meet the industry standards of D.O.E, N.EM.A, and A.N.S.I.
This is to ensure that all of these electrical devices are safe to operate.
The single-phase overhead distribution transformers from DAELIM are designed and associated with a design that is proved to resist low-side voltage surges, which are common issues of single-phase overhead distribution transformers.
In terms of its reliability or efficiency in general, the single-phase overhead distribution transformers from DAELIM are specifically designed for low failure rates and are available in different variants for your suiting.
Customization is also available.
One of the elements that you should consider when looking for a single-phase transformer is its cost, and luck for you, DAELIM’s single-phase distribution transformers are known to be low cost, which means that you won’t have to worry about budgeting with this device.
If you add more than one single-phase distribution transformer and connect it to one another in parallel, this will result in the system being more reliable.
If you find that the existing distribution transformer types or power cannot meet your requirements. You can choose to tell Daelim. Daelim has a team that has always had a wealth of design transformers, and can give you a specific design plan in the shortest time.
Daelim’s distribution transformers comply with IEEE, ANSI, CSA, IEC certification, and are used in North America (such as Canada, the United States, Mexico), South America (such as Ecuador, Chile), Europe (such as Spain, Lithuania) and some Asian countries. Daelim even has a professional installation team that can provide you with installation services.
ELECTRIC, WITH AN ENGE-- DAELIM BELEFIC
