Substation transformer | Outdoor Indoor | Manufacturer Price

Substation transformers have been around for decades and the most common type of them is the distribution substation transformer. In this article, DAELIM, one of the top substation transformer manufacturers in the world, will provide you details about substation transformer ratings, substation transformer diagrams, substation transformer capacity, and many more.

This is crucial for consumers to learn these elements in order to make a clear purchase decision on which substation transformer they should choose from. There are several characteristics you should learn first before proceeding with what substation transformers are.

For instance, since you will learn about what distribution substation transformers are, it is vital that you understand first what distribution transformers are for you to easily understand the characteristics and components of distribution substation transformers.

630 kVa Mini Substation and Miniature Substation

substation transformer

Liquid-Filled Radial Feed Pad Mounted Transformer

Rated Power:75~2500 kva No-load Loss:180~2680W On-load Loss:1250~27786W

Substation transformer

Primary Voltage Ratings: 2.4kV/4.16kV/4.8kV/6.9kV/7.2kV/12kV/12.47kV/13.2kV/13.8kV/23kV/34.5kV/44kV Secondary Voltage Ratings: 208Y/240/480/600/2400/4160Y/4800/12000/12470/13200/13800 TYPE: Oil immersed BIL: 95

Liquid-Filled Loop Feed Pad Mounted Transformer

Primary Voltage Ratings: 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2 or others

Single Phase Pad mounted transformer

Rated Power:15~167 kva No-load Loss:50~350W On-load Loss:195~1410W

Why Choose Daelim As Your Subtation Transformer Supplier?

Looking for high-quality substation transformers for your power needs? Look no further than Daelim Belefic! With over 15 years of experience in designing, engineering, and producing electrical equipment, Daelim Belefic is a leader in the industry. Our focus on “DAELIM EDGE+ ADVANTAGE” ensures that we provide our clients with multiple standards, cutting-edge service, and professional customization skills that help you meet your specific requirements.

Our investment in research and development has allowed us to provide efficient and professional transformer product solutions to our clients, helping them to reduce costs and create new value. We use the latest technology and machines, and our products are made of qualified standard materials that meet the standards of world-renowned suppliers through international procurement.

At Daelim Belefic, we prioritize quality, and we strictly implement the ISO 9001 quality management system to ensure that our products meet the highest standards. We perform three different quality tests to guarantee that our transformers are reliable and safe for our clients. We conduct type tests, FAT tests, and inspection tests to ensure the quality of our products.

Our expert team of electrical engineers, CAD first-class draftsmen, and other professionals control each process from product development to design, production, and manufacturing to achieve our goals. We are familiar with lots of international transformer standards, such as IEC, IEEE / ANSI, CSA, etc. and have more than 20 years of transformer design experience.

Daelim Belefic is committed to providing its customers with the best products and services. Our dedicated customer service, product innovation, engineering excellence, and strong social & environmental responsibility sense have made us a valued and trusted power solutions partner for the global electric industry. Contact us today to learn more about how we can help you with your substation transformer needs!


In the sphere of power distribution, substation transformers are the unseen workhorses that ensure the smooth transfer of energy across diverse infrastructural networks. At Daelim, as an experienced distribution transformer manufacturer, we understand the gravity of this role. We offer a wide range of transformers to cater to varied power needs, be it a 500kV main transformer for extensive power grids or single-phase distribution transformers for localized applications.

Understanding Substation Transformers

Substation transformers are pivotal for adjusting the voltage levels from high to low or vice versa, enabling the efficient transmission and distribution of electric power. These transformers can be seen in different formats – oil-cooled transformers, liquid-filled transformers, and three-phase dry-type transformers among others.

The choice of transformer often depends on the application, power requirement, and location constraints.

For instance, pad-mounted transformers are a common choice for areas that prioritize aesthetic concerns, while ground-mounted transformers may be better suited for industrial regions with spacious outdoor facilities.

Substation Transformers and Power Plants

indoor substation transformer

A substation transformer is a critical component of any power plant setup. Our power plant transformers help facilitate the generation and distribution of electricity across vast distances. Further, they play an essential role in step-up or step-down functions, as seen with our generator step-up transformers, ensuring seamless power supply.

The electric power produced in a power plant is initially at a lower voltage. Herein, a step-up transformer is employed to increase the voltage for efficient long-distance transmission. Subsequently, at the receiving substation, the voltage needs to be stepped down, and this is where substation transformers come into play.

The Broad Spectrum of Applications

Substation transformers can be customized according to the specific power requirements of different sectors, such as the distribution transformer solution for papermaking enterprises, or the distribution transformer capacity solution for processing factory.

Daelim also provides a detailed explanation of 10kV transformers and specifications, underlining our commitment to customer education and transparency in operations.

Whether you need transformers for sale in Canada, or a specific residential pad-mounted transformer, Daelim has got you covered. We pride ourselves on delivering reliable solutions tailored to your unique needs.

In the next part of this article, we will delve deeper into mobile transformer substations, high-voltage distribution transformers, and more. Stay tuned to learn about these exciting topics.

What is a Distribution Transformer?

A distribution transformer is basically a service transformer that provides electricity to houses and other buildings by providing the final voltage transformation in the electric power distribution system. Distribution transformers also have the ability to step down voltages that are used in distribution lines. The purpose of this is to meet consumer needs.

Of course, it comes with several other features as well which is why it is not surprising to see distribution transformers at transmission systems for power distribution purposes since it has the highest power as well or volt-ampere ratings. 

In terms of the substation transformer rating, this is determined through what type of cooling medium the substation transformer is using. This is either pressurized air (forced air) or transformer oil (mineral oil).

Transformers that use pressurized air or forced air are called Dry-type transformers. On the other hand, transformers that utilize oil or mineral are called oil-immersed transformers. Each of which has its own advantages and disadvantages.

The Complete Guide to High Voltage Distribution Transformer

Dry-type Transformer
Dry-type Transformer
oil-immersed transformers
oil-immersed transformers

How do Distribution Transformers Work?

The working principle of distribution transformers is similar to the substation transformer diagram. The main working principle operation of a transformer relies on mutual inductance that is between two circuits, in which, it is linked by a magnetic flux. 

In the case that the second coil circuit is closed, You can expect that current will still flow in it, and this makes electrical energy transferred through the laws of magnetism from the first coil to its secondary coil.

Distribution Transformer Solution for Papermaking Enterprises

What are the Common Applications of Distribution Transformers?

Generally, distribution transformers like distribution substation transformers have the ability to transform high voltage level electricity to low voltage electricity in a matter of seconds for consumer use (i.e., like houses and other establishments.)

Distribution transformers have no problem distributing electrical energy to large industries with less voltage of under 33 kV and 440 V to 220 V for common domestic purposes.

Distribution Transformer Selection of An Office Building

What are the Different Types of Distribution Transformers?

Before you learn what a distribution substation transformer is, it is highly recommended that you familiarize other distribution transformers first. This is another amendment to make things easier for you to understand. 

Selection of 500kV Main Transformer in Hydropower Station

Single-phase Distribution Transformers

Single-phase transformers are primarily used in applications that do not need a three-phase source. This type of transformer is commonly used for repairing overhead distribution powers. The most common scenario would be residential cases.

This type of transformer is also used in commercial loads, power applications, industrial lighting, and many more. However, for applications that have a three-phase source, a three-phase distribution transformer is needed for a successful operation.

Electric Pole Transformer | Single Phase Transformer

Pole-mounted Transformers
Pole-mounted Transformers

Three-phase Distribution Transformers

Speaking of three-phase distribution transformers, these are basically transformers that keep electrical energy from basic distribution networks to a distribution user that uses it less. This means that the transformer passes the current to a secondary distribution case that decreases the voltage primary component.

This type of transformer with a three-phase utility decreases the voltage source for the primary network to meet the user’s requirements or needs.

The voltage involved in this is often modified. Moreover, it can be different for consumers of residential and commercial areas since these electrical devices operate based on the level of ratings of frequency and voltage. This is according to the standards of various countries.

So one of the main differences between single-phase distribution transformers and three-phase distribution transformers is the employed residential application, and the pad used in primary underground networks.

Three-Winding Transformer | Three-Phase Transformer

Mounted Transformers

There are two common types of pad-mounted transformers that are commonly seen in public, and that is the ground-mounted transformer and the pole-mounted transformer. These two are famous transformers that are safe to be exposed in public. However, they do not have the same functions.

But in general, pad-mounted transformers usually consist of metal housing, and they are set at a location where there is not enough space. For pole-mounted transformers, this simply is not the case since they can be mounted onto utility poles.

Basically, these devices can be employed with electric energy distribution lines at an overhead electrical path for lowering the primary voltage for the purpose of providing the consumers’ electricity,

One of these mounted transformers can actually serve multiple houses or buildings. Supplying electricity to a single building or house is no problem. But for large establishments like industrial buildings or factories, then a transformer of another type is best for that situation.

These transformers can be constructed and secured from corrosive elements that can pose a threat to ordinary transformers. Since they are exposed to the public, this means that outside elements like harsh weather, animals, pedestrians, etc. can easily interfere with the transformer’s operations.


What is a Substation Transformer?

Now that you have met some of the different types of distribution transformers, getting to know and understanding what substation transformers are will no longer be a difficult topic for you to understand.

For starters, substation transformers are commonly used with outdoor substations. Moreover, these are highly rated, usually about 750 to 5,000 kVA or Kilovolt Amperes (for single-phase devices) and 750 to 25,000 kVA for three-phase devices.

High voltage transformers can also step down voltages. For instance, 220kv stepped down or decreased to 10kV.

A substation transformer is a large piece of electrical equipment that is used to step down the voltage of electricity from the high voltage transmission lines to a lower voltage suitable for distribution to homes and businesses. It is typically located in a substation and is responsible for ensuring that the electrical power is distributed safely and efficiently.


Substation Transformer Diagram

When it comes to the substation transformer diagram, substation transformers basically follow the rule of thumb of transformers in general as well. Transformers are usually categorized as a passive electrical device that transfers electricity or electrical energy from circuit to circuit through the process of electromagnetic induction.

The substation transformer diagram is commonly used to increase or decrease the voltage levels between the circuits.

Selection of Power Distribution Main Transformer in 110kV Substation Design

Winding of 10 kv transformer
Winding of 10 kv transformer

Substation Transformer Ratings

For substation transformer ratings, there is a variety of rating out there since nowadays there are a lot of substation transformers available with different ratings. This could depend on the substation transformer manufacturers if they add or decrease the traditional substation transformer ratings.

Selection of Power Distribution Main Transformer in 110kV Substation Design

Substation Transformer Capacity

This also goes the same for the substation transformer capacity because substation transformer manufacturers can nerf or tweak this aspect of the substation transformer. A typical substation transformer would normally be rated somewhere between 69-13 kV and 20 MVA.

This means that the primary voltage is usually around 69 kV. On the other hand, the secondary voltage would be around 13 kV. The substation transformer capacity has a power rating of 20 MVA or 20,000 kVA.

Selection and Capacity Calculation of Transformers Used in Substations


The connections of substation transformers indicate how three phases of transformer winding are associated with one another. There are basically two connections of the windings, the Delta which is where the end of each phase winding is linked to the start of the following phase, and the Star that connects two ends of each phase are connected with one another.

Normally, substation transformers are connected with a delta formation at the high-voltage aspect and wye for the low voltage aspect. The delta connection also isolates two systems when it comes to giving the harmonics space. 

However, these are not preferred by the system. The wye connection on the other had established a convenient neutral point for the purpose of connecting it to the ground.

Connection Mode of Working Winding of Three-phase Transformer

Voltage Regulation

This indicates that the transformer is capable of changing the low voltage side voltage in order to maintain nominal voltage at customer service points. The voltage at customer service points can fluctuate as a result of either primary system voltage fluctuation or excessive voltage drop due to the high load current.

Transformer taps effectively change the transformation ratio and allow voltage regulation of 10–15% in steps of 1.75–2.5% per tap. Transformer tap changing can be manual or automatic.

However, only under-load type tap changers can operate automatically.

What is a Distribution Substation Transformer?

Now that you know the fundamentals of substation transformers, it is time to move on to what are distribution substation transformers. 

For starters, distribution substation transformers are transformers that usually operate at 2.4 – 34.5 kV voltage levels. Moreover, distribution substation transformers deliver electric energy or electricity directly to residential consumers. For industrial consumers, this is also possible as well.

Distribution feeders also transport power from the distribution substations for the purpose of delivering it to the homes of the consumers. Basically, these feeders are capable of serving multiple buildings or establishments.

In the case of the consumer’s premises, the distribution substation transformer will be responsible for transforming the voltage to the service level voltage that is directly used in households and industrial plants that are usually rated from 110 volts to 600 volts.

Substation Transformer
Substation Transformer

Supply Line

When it comes to the distribution substation transformer’s supply line, the distribution substation transformer is basically connected to a sub-transmission system with one supply line. This is referred to as the “primary feeder”.

However, keep in mind that it is normal for distribution substation transformers to be supplied with two or more supply lines. The purpose of this is to increase the reliability of the power supply in the case that a supply line is accidentally disconnected.

These supply lines are connected to the substation transformer through high voltage disconnecting switches. This is to prevent isolated lines from the substation in order to do maintenance or any repair work.

Power Rating

substation transformer ratings are usually expressed through kilovolt amperes or kVA. But they can be expressed in MVA as well, which means megavolt ampers. This basically indicates the amount of power there can be when there is a transferring process through the transformer.

substation transformers usually range from 3 kVA to 25 MVA.

Voltage Rating

In terms of the voltage rating, it is a different aspect from the power rating, and it is governed by the sub-transmission and distribution voltage levels in which the transformer is connected. Furthermore, there are voltages that are governed by applicable standards as well.

This is one of the reasons why the voltage rating is showcased by the substation transformer manufacturers

The voltage rating is what dictates the construction and insulation of the requirements of the transformer. This is for the transformer to be able to withstand the rated voltage or higher when the system is in operation.

Cooling Medium

In terms of the cooling medium, as mentioned there can be two possible cooling mediums used by transformers, which are mineral oil and pressurized air.

The cooling medium basically dictates what the transformer’s power rating is capable of, as well as inspecting the level of temperature it can withstand during peak demands. Transformer rating involves self-cooling ratings at specified temperatures during operations.

What is the difference between a pad-mounted transformer and a substation transformer?

A pad-mounted transformer is a type of transformer that is installed on a concrete pad, typically at ground level. It is designed for outdoor use and can be seen in residential, commercial, and industrial areas. It is typically used to step down the voltage from a medium voltage to a low voltage that can be used by buildings or homes. These transformers are relatively small, and they can range in size from a few kVA to around 3000 kVA.

On the other hand, a substation transformer is a larger transformer that is typically used in electrical substations. These transformers are designed to step down the voltage from a high voltage to a lower voltage that can be distributed to homes and businesses. They are much larger than pad-mounted transformers and can range in size from a few hundred kVA to several MVA.

The main difference between a pad-mounted transformer and a substation transformer is their size and location. Pad-mounted transformers are smaller and located on the ground, while substation transformers are larger and located within electrical substations. Pad-mounted transformers are often used for local distribution, while substation transformers are used for higher voltage transmission and distribution.

Pad-mounted transformers are also typically more visible to the public, as they are often installed in areas where they are more easily seen. Substation transformers are typically located in fenced-in areas and are not as visible to the public.

Overall, both pad-mounted and substation transformers play an important role in the electrical grid, as they help to step down voltage for local use. Understanding the difference between the two can help customers to make more informed decisions about their power needs.

What are some substation transformer manufacturers?

When it comes to substation transformers, it is important to choose a reliable and experienced manufacturer that can deliver high-quality products. Here are some reputable substation transformer manufacturers that have a strong track record in the industry:

substation transformer function
substation transformer function


DAELIM BELEFIC TECH CO. LTD. is a well-known manufacturer of substation transformers with more than 15 years of experience in the field. Their substation transformers are designed, engineered, and produced with a focus on high-quality electrical equipment. DAELIM BELEFIC’s substation transformers are also known for being efficient, safe, environmentally friendly, and have low lifecycle costs. They strictly implement the ISO 9001 quality management system and conduct multiple quality tests to ensure that their transformers meet the required standards.

ABB Group

ABB Group is a leading manufacturer of substation transformers and offers a wide range of products and services related to power transmission and distribution. ABB Group has extensive experience in the design, engineering, and production of substation transformers for a variety of applications.

Siemens Energy

Siemens Energy is another prominent manufacturer of substation transformers, providing solutions for the transmission and distribution of electrical power. The company offers a comprehensive range of substation transformers, from small distribution transformers to large power transformers for utility applications.

Toshiba Corporation

Toshiba Corporation is a Japanese multinational company that has been manufacturing transformers for over 100 years. The company provides a range of substation transformers for various applications, including power transmission and distribution, as well as industrial and commercial applications.

Hyundai Heavy Industries Co. Ltd.

Hyundai Heavy Industries Co. Ltd. is a South Korean company that offers a wide range of products and services related to power generation, transmission, and distribution. The company provides a range of substation transformers for utility and industrial applications, designed to meet the highest standards of quality and efficiency.

Overall, it is important to choose a substation transformer manufacturer with a strong track record in the industry, as this will ensure that you receive high-quality, reliable products that meet your specific needs and requirements.

How to Choose a Industrial Transformer Application for a Chemical Plant?

What is the function of a substation transformer?

The function of a substation transformer is to transfer electrical power from one voltage level to another. In a power system, electrical power is generated at high voltage levels (usually above 10 kV) and is then transmitted over long distances through transmission lines. However, this high voltage cannot be used directly by consumers. Therefore, at various points along the transmission line, there are substations that step down the voltage to lower levels (usually below 1 kV) that can be used by consumers.

The substation transformer is a key component in the substation that is responsible for stepping down the voltage. It consists of two coils of wire, known as the primary winding and the secondary winding. The primary winding is connected to the high voltage transmission line, while the secondary winding is connected to the distribution line that supplies power to consumers.

The substation transformer works by using the principle of electromagnetic induction. When an alternating current (AC) flows through the primary winding, it creates a magnetic field that induces a voltage in the secondary winding. The ratio of the number of turns in the primary winding to the number of turns in the secondary winding determines the amount of voltage step-down.

Substation transformers come in a range of sizes and specifications to suit different voltage levels and power demands. They are designed and manufactured by specialized transformer manufacturers, such as Daelim Belefic, who have the expertise and experience to produce high-quality, reliable transformers that meet the specific requirements of their clients.

Ultimate Dirstribution Transformer for Guide

What sizes and specifications are available for substation transformers?

substation transformer sizes
substation transformer sizes

Substation transformers come in a range of sizes and specifications to meet various power distribution needs. The size and specifications of substation transformers depend on several factors such as the level of voltage required, load demand, and the type of substation.

In general, substation transformers can be classified by their power rating, which is measured in kilovolt-amperes (kVA). The power rating of a substation transformer can range from a few kVA to several hundred MVA.

The physical size of a substation transformer is also an important consideration. The size of a substation transformer is typically determined by the amount of insulation required for the voltage level and load demand. Larger transformers will generally require more insulation and therefore have a larger physical size.

Substation transformers are also available in different specifications depending on the specific application requirements. Some common specifications include the type of cooling system, such as forced air or liquid, and the type of insulation, such as oil or dry-type.

Other specifications that can vary between substation transformers include the number of phases, the frequency, and the voltage class. The most common voltage classes for substation transformers are 69 kV, 115 kV, 138 kV, 230 kV, and 345 kV.

When selecting a substation transformer, it is important to consider all of these factors to ensure that the transformer meets the specific requirements of the application. Consulting with a reputable substation transformer manufacturer can help in selecting the appropriate size and specifications for the transformer needed.

Why Does the Power Factor of the Distribution Transformer Become Smaller?

What is the weight of a substation transformer?

The weight of a substation transformer can vary greatly depending on its size, voltage rating, and other specifications. Typically, smaller substation transformers designed for distribution-level voltages (typically up to 69 kV) have a weight of a few thousand pounds, while larger substation transformers designed for higher voltage levels (up to 765 kV) can weigh several hundred thousand pounds.

The weight of a substation transformer is an important consideration when it comes to transportation, installation, and maintenance. Larger transformers often require special equipment for transportation and installation, such as cranes and heavy-duty trucks, while smaller transformers can be transported using standard flatbed trailers.

It is important to consult the manufacturer’s specifications for a particular substation transformer to determine its exact weight, as well as any special transportation or installation requirements.

Mobile Transformer Substations and High Voltage Distribution: The Heart of Modern Power Networks

As we navigate through the expansive world of substation transformers, it’s crucial to highlight some specific aspects that significantly influence modern power distribution networks. We will explore the concept of mobile transformer substations and the essential role of high-voltage distribution transformers in maintaining a reliable power supply.

Mobile Transformer Substations: Power on the Move

High voltage distribution transformers play a pivotal role in transmitting electrical power across long distances. They step down the high voltage from transmission lines to a level suitable for local distribution networks.

At Daelim, our high-voltage distribution transformers are designed to ensure maximum efficiency and reliability. Alongside, we also offer utility electric pole transformers and ground-mounted transformers for specific usage scenarios, each designed with precision and a thorough understanding of power distribution requirements.

High Voltage Distribution Transformers: Powering the Grid

A mobile transformer substation, also known as a compact substation or a mini substation, is a unique solution for flexible and emergency power needs.

This setup typically includes a transformer and a high-voltage switchgear assembled on a self-supporting platform, offering a plug-and-play solution that can be rapidly deployed to manage unexpected power outages or temporary power needs. Mobile transformer substations can accommodate various transformers, including three-phase transformer and single-phase distribution transformers, allowing adaptability to diverse power requirements.

Mobile transformer substations act as a rapid response unit in the power grid, ensuring continuity in power supply during critical times.

Bespoke Transformer Solutions

We understand that every scenario might require a different solution. Therefore, we provide distribution transformer selection for office buildings, three-winding transformers for specific applications, or cooper pad-mounted transformers for more robust power needs.

Understanding your needs and providing an effective solution is our primary focus. For instance, if you’re uncertain about what to look for, our comprehensive guide on how to choose a distribution power transformer will walk you through the process.

To conclude, substation transformers form an essential part of our power networks, be it in mobile substations, high-voltage distribution, or tailored applications. Our commitment at Daelim is to provide reliable and high-quality transformers, optimized to meet the unique requirements of every customer. We take pride in our power distribution main transformer range and the varied collection of products designed for your specific needs.

Embracing the Future: Transmission Transformers and Innovative Solutions

Diving deeper into the intricacies of substation transformers, let’s explore the critical role of transmission transformers. We’ll also introduce some novel solutions like the three-phase distribution transformers, pushing the envelope of transformer technology and efficiency.

Transmission Transformers: The Highways of Power

Transmission transformers are integral to the electric power grid. They handle high-voltage power from generation plants, making it suitable for transmission across vast distances.

Our state-of-the-art transmission transformers can withstand these high voltage levels, offering superior performance and a long lifespan. They are designed with precision and quality materials, promising reliability and efficiency in the most demanding conditions.

“Efficiency, reliability, and durability form the core of our transmission transformer design philosophy.”

Innovations and Trends

The landscape of power distribution is ever-evolving, with technological advancements and innovative solutions continuously reshaping the industry. For example, our three-phase distribution transformers provide efficient power distribution in both urban and rural areas, showcasing the ability to adapt to varied power needs.

Moreover, our oil-filled transformers offer a robust solution for high-capacity power transmission and distribution. These transformers ensure efficient heat dissipation, resulting in enhanced performance and longer equipment lifespan.

We are also proud to offer an assortment of ground-mounted options, including ground-mounted transformers. These are particularly suitable for industrial and commercial applications where there’s ample space for outdoor installations.

Tailored Solutions for Every Need

At Daelim, we appreciate the unique power requirements of different sectors and are committed to providing tailored solutions. Whether it’s a power plant transformer for a new energy project or a distribution transformer for a processing factory, our extensive collection ensures we have the right transformer for every need.

We understand that choosing a transformer can be a complex process. That’s why we provide resources like how to choose a distribution power transformer, guiding you through the process.

In conclusion, substation transformers, especially transmission transformers, are the backbone of our modern power systems. As a leading transformer manufacturer, Daelim is dedicated to offering top-quality, efficient, and reliable products designed to meet the evolving needs of our customers. By embracing innovative technologies and solutions, we strive to power a brighter, more sustainable future.

What Role Does a Substation Transformer Play in Power Distribution?

Importance of Substation Transformers in Power Distribution

A substation transformer serves a pivotal role in the power distribution network. It primarily modifies the voltage level between the transmission and distribution systems. By efficiently adjusting these voltage levels, the substation transformer ensures that power is transmitted over long distances without significant losses.

When energy reaches the consumer’s end, it must be at the correct voltage for safe usage. Here, the substation transformer steps in, converting the high transmission voltages to lower, usable levels for households and industries.

Furthermore, these transformers play an integral role in stabilizing grid operations. In scenarios where there’s a sudden spike or dip in power demand, the transformer helps maintain a consistent supply.

In addition, substations equipped with these transformers often have advanced monitoring systems. These systems provide real-time data, helping operators make informed decisions.

For those keen on the financial aspect, the efficiency of a substation transformer can lead to significant cost savings. Reducing energy wastage is not only good for the wallet but also for the environment.

To summarize, the substation transformer is the bridge connecting power generation sites to consumers, ensuring a steady and safe energy supply.

: Which Specific Transformers are Essential for Substations?

The Crucial Transformers for Substations

Electrical substations house various transformers, each serving a unique purpose. The key transformers include:

  • Power Transformers: These are the primary transformers in substations. They handle large voltage levels and are vital for transmitting power from generating stations to the substation.

  • Distribution Transformers: Positioned closer to the consumer end, these transformers step down the voltage to usable levels for homes and businesses.

  • Instrument Transformers: These are specialized transformers, including Current Transformers (CTs) and Potential Transformers (PTs). They provide accurate current and voltage measurements for metering and protective relaying.

  • Phase Shifting Transformers: They control the power flow between specific lines in interconnected grids, ensuring a balanced and efficient distribution.

  • Autotransformers: Unlike conventional transformers, these have only one winding per phase. They are often used because of their cost and size advantages, especially when adjusting small voltage differences.

  • Special Transformers: These cater to specific needs, like furnaces or rectifiers. Their design might differ based on the application they serve.

In the context of substations, the choice of transformer relies heavily on its intended function. While power transformers manage large power loads over longer distances, distribution transformers are about delivering that power to the end user in the required form.

When it comes to safety and monitoring, instrument transformers are indispensable. They ensure that all operations within the substation are within safe parameters and provide critical data to operators.

The interconnected nature of modern grids means that controlling power flow is more vital than ever. Phase shifting transformers, in this regard, prevent overloading and maintain the integrity of the grid.

In essence, each transformer in a substation is a cog in the larger machine. Together, they ensure power is distributed efficiently, safely, and reliably.

Why Are 3-Phase Transformers Crucial in Substations?

The Significance of 3-Phase Transformers in Electrical Substations

Three-phase transformers are fundamental in power systems. These transformers handle three-phase electric power, the standard method for transferring electricity in grids worldwide.

First, 3-phase transformers are incredibly efficient. By handling three phases simultaneously, they distribute power evenly, reducing the chances of overloads in any single phase.

Moreover, they are cost-effective. Instead of installing three separate single-phase transformers, a single 3-phase unit does the job. This consolidation reduces costs, both in terms of equipment and installation.

Another advantage is their compact nature. Despite handling multiple phases, their design is relatively compact, saving crucial space in substations.

In industrial settings, which often rely on heavy machinery, 3-phase transformers ensure a smooth and steady power supply. This consistent energy flow is vital for machines that require substantial power without interruptions.

In summation, 3-phase transformers are an indispensable part of substations. Their efficiency, cost-effectiveness, and adaptability make them a staple in modern power distribution systems.

Is Every Electrical Substation Equipped With a Transformer?

Transformers: An Integral Part of Every Electrical Substation?

While it might seem intuitive that every electrical substation houses a transformer, this isn’t always the case. Most substations do contain one or more transformers. They play the role of adjusting voltage levels between transmission lines and distribution networks.

However, there are “switching substations.” These substations don’t adjust voltage levels but instead direct the flow of electricity. Their primary function is to connect different parts of the power grid and manage the flow without necessarily transforming the voltage.

That said, the vast majority of substations you’ll encounter do have transformers. These are critical hubs in the power distribution system, ensuring electricity gets to consumers at the correct voltage.

In essence, while most electrical substations are equipped with transformers to adjust voltage, some serve purely as junction points in the grid.

What Determines the Number of Transformers in a Substation?

Factors Influencing Transformer Count in a Substation

The number of transformers in a substation isn’t arbitrary. Several factors determine this count:

  • Power Load: The primary factor is the total power load the substation needs to handle. Larger loads may require multiple transformers to distribute the power effectively.

  • Redundancy Needs: To ensure uninterrupted power, substations often have backup transformers. In case of a failure or maintenance requirement, these backups can take over.

  • Type of Substation: Distribution substations might have fewer transformers than transmission substations, as they deal with lower voltages.

  • Future Expansion Plans: If there’s a plan to expand the grid or accommodate more power in the future, additional transformers might be installed in anticipation.

  • Space and Layout: Physical constraints of the substation area can influence the number and size of transformers installed.

To put it briefly, the transformer count in a substation is determined by load requirements, redundancy needs, and logistical considerations.

How Do We Categorize the Sizes of Substation Transformers?

Distinguishing Substation Transformer Sizes

Substation transformer sizes can be categorized based on various factors:

  • Capacity (MVA Ratings): One of the primary ways to categorize transformers is by their power handling capacity, measured in MVA (Mega Volt-Ampere).

  • Physical Dimensions: Especially in space-constrained substations, the physical size of a transformer becomes crucial. This can range from compact units to large, high-capacity ones.

  • Voltage Levels: Transformers are also categorized by their voltage rating, indicating the maximum voltage they can handle.

  • Application: Special transformers, like furnace or rectifier transformers, have specific sizes tailored to their functions.

In essence, the size of a substation transformer is determined by its capacity, physical dimensions, voltage ratings, and specific applications.

How Does a Busbar Function in an Electrical Substation?

Role of Busbars in Electrical Substations

Busbars in substations are foundational. These thick strips of copper or aluminum are responsible for distributing electricity from transformers to different outgoing circuits.

Advantages include:

  • Efficiency: Provides a streamlined path for electricity, minimizing losses.

  • Flexibility: Can be designed to accommodate varying power loads.

  • Safety: With their robust design, busbars reduce the risk of electrical faults.

In short, busbars ensure efficient, flexible, and safe power distribution within substations.

What Voltage Level is Maintained from the Substation to Residences?

Voltage Transition: From Substations to Homes

When electricity moves from substations to homes, it’s crucial that it’s at a safe and usable voltage. Typically, this voltage ranges from 110V to 240V, depending on the country and standard.

To achieve this:

  1. High Voltage Transmission: Electricity initially travels at high voltages (115kV to 765kV) for efficiency over long distances.
  2. Substation Transformation: Once at the substation, transformers reduce this high voltage to a medium voltage.
  3. Distribution: This medium voltage is then further stepped down by distribution transformers, usually situated on poles or underground, closer to residences.

In summary, while substations handle high to medium voltages, the final transformation to lower voltages suitable for home use occurs closer to the end users, ensuring safe and efficient power distribution.

Why Opt for Busbars Over Traditional Wiring in Substations?

Making the Case for Busbars in Electrical Substations

The debate between using busbars and traditional wiring might seem nuanced, but there are tangible benefits to employing busbars:

  • Current Capacity: Busbars can handle a much larger current than conventional wiring. This capacity is essential in substations where high currents are the norm.

  • Heat Dissipation: With their wider surface area, busbars dissipate heat more efficiently than wires. This feature helps prevent overheating and enhances the longevity of the setup.

  • Reduced Resistance: A lower resistance in busbars ensures fewer power losses, contributing to the efficiency of power distribution.

  • Safety and Reliability: Busbars present a reduced risk of electrical fires due to their robust construction. Their rigid nature also minimizes the chance of accidental disconnections.

  • Space-Efficient: In comparison to a bundle of wires carrying the same current, a busbar system occupies less space, making it ideal for space-constrained substations.

In essence, busbars are a preferred choice in substations due to their capacity, efficiency, safety, and space-saving characteristics.

What Impacts Substation Transformer Prices?

Unpacking the Cost Factors of Substation Transformers

The price of a substation transformer isn’t just about its capacity. Several factors influence its cost:

  • Raw Materials: The price of steel, copper, and insulation materials can significantly influence the final cost of the transformer.

  • Technology and Features: Transformers with advanced features, such as on-load tap changers, or those built using cutting-edge technology, tend to be pricier.

  • Customization: Custom-built transformers, tailored for specific needs, often come at a premium.

  • Labor and Manufacturing Costs: Production costs can vary based on the location of the manufacturing facility and the complexity of the design.

  • Transportation and Logistics: Heavier transformers might incur higher shipping costs.

  • Certifications and Compliance: Transformers adhering to specific international standards or certifications might be priced higher due to the added quality assurance.

In summary, the pricing of a substation transformer is a culmination of material, technological, logistical, and compliance factors.

What are the main functions of a main power transformer in a substation?

Main power transformers are vital equipment in substations. They play a pivotal role in electricity distribution. Their primary function? To convert voltage levels. Here's how:

  • Voltage Step-up: Before power can travel long distances, it needs to be at a higher voltage. Main power transformers increase this voltage.

  • Voltage Step-down: As electricity nears its destination, its voltage needs decreasing. Again, this is where our transformer steps in.

  • Safety: Power transformers create a barrier. They prevent high voltage from directly entering homes and businesses.

  • Efficiency: These transformers ensure that power loss is minimal during transmission.

  • Connection: They help in connecting various parts of the electric grid.

  • Energy Distribution: Directing electricity to where it's needed most.

  • Protection: Safeguarding other substation equipment from voltage surges.

  • Monitoring and Control: Many modern transformers come equipped with monitoring systems. This ensures that any irregularities are quickly detected.

  • Power transformer in substation functions might seem straightforward. Yet, the technology and precision behind them are awe-inspiring. Many industries trust and rely on these powerhouses for their daily operations.

How does a power transformer differ from other types of transformers?

At the core, all transformers serve one purpose – to modify electrical voltage. Yet, not all transformers are created equal. Power transformers, especially main power transformers, stand out.

  • Capacity: Power transformers can handle a massive load. They're designed to manage high voltage and power.

  • Size: Due to their capacity, they're often larger than other transformer types.

  • Location: Typically found in substations and power generation stations.

  • Application: They're crucial for long-distance electricity transmission.

  • Frequency: Main power transformers operate at high frequencies. This is due to their role in electricity transmission.

The world of transformers is diverse. From pole-mounted transformers to HV power transformers, the variety is vast. However, when it comes to sheer power and capacity, main power transformers reign supreme.

What are the primary uses of main power transformers?

Main power transformers are not just power converters; they are pivotal to efficient power distribution. Here's why they are indispensable:

  • Bulk Transmission: They aid in transmitting massive amounts of power across vast distances.

  • Stability: They provide consistent power, ensuring stability in the grid.

  • Integrating Renewables: As we push towards green energy, main power transformers help integrate solar and other renewable sources.

  • Regulation: They aid in voltage regulation, ensuring devices and machinery get the precise voltage they need.

  • Versatility: Main power transformers can be tailored. Whether it's for industries, data centers, or commercial buildings, customization ensures they fit the bill.

Understanding the many uses of power transformers is crucial. These devices ensure that from the moment you flick a switch, power is delivered safely and efficiently.

Which industries rely heavily on main power transformers?

Main power transformers are the backbone of many sectors. Their adaptability and efficiency make them a popular choice. Here's a snapshot:

  • Utilities: Power distribution to homes and businesses is primarily thanks to these transformers.

  • Data Centers: With the boom in tech, data centers, including encryption mines, need a reliable power source. Enter, power transformers.

  • Renewable Energy: Solar farms and wind turbines require these transformers to push power into the grid.

  • Oil and Gas: In this industry, reliable power is a must. Transformers ensure uninterrupted operations.

  • Industrial Facilities: From factories to mills, these facilities run on power. Transformers make that possible.

Industries trust main power transformer manufacturers like Daelim to ensure that their operations run seamlessly, showing the true significance of these power players.

How do main power transformer manufacturers ensure quality and compliance?

Quality is not a mere buzzword when it comes to main power transformers. Manufacturers adopt rigorous standards to ensure excellence. Here's a look:

  • Standards Adherence: ANSI, IEC, IEEE – these aren't just acronyms. They are a testament to a transformer's quality.

  • Testing: Rigorous testing in factories and third-party labs guarantees top-notch products.

  • Monitoring: Modern transformers have built-in monitoring. This ensures they operate optimally at all times.

  • After-Sales Service: Quality doesn't end after a sale. Companies like Daelim emphasize post-sale service, with branches globally ensuring smooth operations.

Manufacturers know that a transformer's quality directly impacts power reliability. That's why they leave no stone unturned to deliver the best.

How do solar energy systems utilize main power transformers?

Solar energy is clean and sustainable. But harnessing it requires robust equipment like main power transformers. They play several roles:

  • Voltage Conversion: Solar panels produce low-voltage power. Transformers step it up for long-distance transmission.

  • Grid Integration: Before solar power can be integrated into the grid, its voltage must match the grid's. Transformers make this possible.

  • Safety: They ensure that the power from solar installations is safely transmitted, protecting both the grid and end-users.

  • Efficiency: As with other applications, transformers minimize energy loss from solar farms, ensuring maximum energy utilization.

Solar might be the future of energy, but it relies heavily on the steadfast technology of power transformers to truly shine.

What are the essential components inside a power transformer?

Peeking inside a power transformer is like looking at the heart of the power distribution system. Several components work in harmony:

  • Windings: Conductive coils, either copper or aluminum, that facilitate voltage transformation.

  • Core: Typically made from laminated steel, it supports and provides a path for magnetic flux.

  • Insulation: Ensures that the windings and other components remain separate, preventing short circuits.

  • Tap Changers: Allow for the adjustment of the transformer's output voltage.

  • Cooling System: Keeps the transformer from overheating, using oil or air as a coolant.

  • Bushings: Provides an insulated entry for electrical connections.

Knowing these components is essential. After all, they collectively ensure the safe and efficient operation of the power transformer.

How do power transformers contribute to energy storage and renewable power plants?

Transformers are not just about converting voltage. In the realm of renewable energy, they have more roles:

  • Interconnection: They serve as a bridge, connecting renewable sources like wind or solar to the main grid.

  • Storage Integration: With batteries storing renewable energy, transformers help in drawing or feeding this stored energy.

  • Harmonization: Different renewable sources might generate power differently. Transformers harmonize this power, ensuring consistency.

  • Optimization: They ensure that the power from renewable sources is optimized, minimizing losses.

In the green energy revolution, the main power transformer emerges not just as a participant but a leader, guiding the way.

What is the significance of the ANSI and IEEE standards in power transformer manufacturing?

Standards ensure consistency, safety, and quality. In power transformer manufacturing, ANSI and IEEE play a pivotal role:

  • Safety Protocols: These standards outline safety measures, ensuring minimal risks during operations.

  • Performance Benchmarks: They set the performance expectations for transformers, ensuring they deliver as promised.

  • Interoperability: Ensuring transformers from different manufacturers can work seamlessly together.

  • Innovation: While they set standards, they also encourage innovations, ensuring the industry moves forward.

For those in the know, ANSI and IEEE are more than just acronyms. They are the gold standards, ensuring every power transformer meets the mark.

Where can one access detailed power transformer pdf manuals and guidelines?

Knowledge is power, and with power transformers, accurate information ensures safe operations:

  • Manufacturer's Website: Companies like Daelim often provide detailed PDFs on their products.

  • Industry Associations: IEEE, ANSI, and similar bodies often have publications on transformer guidelines.

  • Utility Companies: They often have resources, especially pertaining to installation and maintenance.

  • Technical Libraries: Some specialized libraries store comprehensive manuals on electrical equipment.

When in doubt, always refer to official documentation. A power transformer's operation is intricate, and having the right information is paramount.

Final Thoughts

Substation transformers are excellent electrical devices that are a combination of both a substation and a distribution transformer. Basically, they are capable of doing what substations and distribution do. 

This means that if your purpose or project requires distribution operations, then the substation transformer is a great option to choose from.

However, if you have any questions or clarifications about substation transformers, it is best to contact DAELIM’s team of professionals first before making a purchase decision. This is to ensure that you are getting the right type of transformer for your project or usage.

About Bin Dong

Hello, I am Bin, General manager of Daelim which is a leading transformer manufacturer. As a expert, I am glad to share my experience in transformer to you. I believe our professional team can always provide you with high quality service and we are ready to provide you with one stop solution. If you have problems when you are looking for the equipment, what you need to do is tell us.

Custom Substation Transformer

When you need to find more than just existing transformers, Daelim’s Transformer Service Center can help you design and produce distribution transformers that meet your unique needs.

We have our own factory and a professional team of engineers, which can design and modify application requirements that meet all your conditions.

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