substation transformer

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

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Pofessional Manufacturer of Pad Mounted Transformer Substation Transformer,HV Power Transformer Single Phase Transformer IEEE/ANSI,CSA,DOE,AS/NZS,IEC and etc。standards

Single Phase Transformer
Pad Mounted Transformer
dry type transformer
Distribution Transformer
220kv Power Transformer
69kv Power Transformer

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Single Phase Transformer CESI






Table of Contents

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.

What is a transformer substation?

A transformer substation, also known simply as a substation, is a critical component in the electrical power grid. It serves as a hub for the collection and distribution of electricity from power plants to various consumers, such as residential areas, industries, and commercial establishments. The main functions of a transformer substation include:

Transformation of Voltage Levels:

  1. Step-Up Transformers: At generating stations, transformer substations increase (step up) the voltage for efficient transmission over long distances.
  2. Step-Down Transformers: Near consumption points, they decrease (step down) the voltage for safe and effective distribution to end-users.

Connection Point in Power Grid:

  • Interconnecting Different Networks: Substations connect transmission lines from different power plants and facilitate the transfer of power between them.
  • Switching Functions: They include switchgear that can connect or disconnect parts of the grid for maintenance or to reroute power in case of faults.

Importance in Power Grid:

  1. Efficiency in Power Distribution: By adjusting voltage levels, transformer substations ensure efficient transmission of electricity, minimizing power losses over long distances.
  2. Reliability and Stability: They play a vital role in maintaining the stability and reliability of the power grid by managing the flow of electricity and responding to changes in demand.
  3. Fault Isolation: Substations help in isolating faults in the system, thereby preventing widespread outages and allowing for quicker restoration of power.
  4. Support for Renewable Energy: Modern substations are equipped to integrate electricity generated from renewable sources like solar and wind into the grid.
  5. Load Balancing: They assist in balancing the load on the grid, ensuring that electricity supply meets demand without overloading the system.

Role in Urban and Rural Infrastructure:

  • Urban Areas: In cities, substations are crucial for powering industries, commercial centers, and residential complexes.
  • Rural Areas: They facilitate the extension of electrical coverage to remote and rural locations, contributing to regional development.

In summary, transformer substations are indispensable in the power grid, ensuring efficient, reliable, and safe distribution of electricity from generation points to end-users. They act as nodal points in the grid, performing critical functions such as voltage transformation, load balancing, and fault management. Their role is especially vital in integrating renewable energy sources and in enhancing the overall efficiency and sustainability of the power distribution system.

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.

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.


Types of Transformer Substations

Transformer substations can be broadly classified into various types based on their purpose and function within the electrical power grid. Here are the main types:

  1. Transmission Substation:

    • Purpose: Primarily used in the transmission network to step up or step down voltage.
    • Features: Equipped with high-voltage transformers, they often have switchgear for controlling high-capacity power flows.
    • Role: Facilitate the efficient transmission of electricity over long distances by increasing voltage to reduce losses (step-up) or reducing voltage for further distribution (step-down).
  2. Distribution Substation:

    • Purpose: Located near consumer areas to step down the voltage for local distribution.
    • Features: Typically equipped with one or several transformers, these substations lower the voltage to levels suitable for residential, commercial, or industrial use.
    • Role: Serve as the final voltage transformation stage in the power grid, delivering electricity at usable levels to end consumers.
  3. Collector Substation:

    • Purpose: Primarily used in renewable energy setups, like wind farms or solar parks.
    • Features: Collect electricity generated from multiple sources at a lower voltage level and step it up for transmission.
    • Role: Integral in integrating renewable energy sources into the power grid.
  4. Converter Substation:

    • Purpose: Convert AC (Alternating Current) to DC (Direct Current) or vice versa in High Voltage Direct Current (HVDC) transmission systems.
    • Features: Equipped with devices like thyristors and converters for AC-DC conversion.
    • Role: Enable long-distance and underwater power transmission, and connect grids with different frequencies or incompatible systems.
  5. Switching Substation:

    • Purpose: Primarily for switching operations within the transmission network, without transforming voltage.
    • Features: Consists mainly of switchgear for routing current paths, without transformers.
    • Role: Enhance grid flexibility and reliability, allowing for maintenance, reconfiguration, or isolation of grid segments.
  6. Railway Substation:

    • Purpose: Provide electricity to railway systems.
    • Features: Convert the general power supply to a suitable form and voltage for railway systems.
    • Role: Essential for the operation of electric-powered trains, ensuring safe and reliable power for railways.

Each type of substation plays a unique and critical role in the overall functionality and efficiency of the power grid, catering to specific needs like voltage transformation, power routing, integration of renewable energy, long-distance transmission, and railway electrification. The choice and deployment of a particular type of substation depend on various factors like location, power demand, source of electricity, and grid infrastructure.

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.

Elements of a Transformer Substation

Transformer substations consist of various elements that collectively ensure the effective transformation and distribution of electrical power. These components can vary depending on the type and function of the substation, but generally, they include the following:

  1. Distribution Transformers:

    • Function: Primarily used in distribution substations to step down the voltage from transmission levels to levels suitable for consumer use.
    • Features: Designed to handle lower voltages and smaller capacities compared to transmission transformers. They are typically more numerous and widely distributed.
  2. Substation Transformers:

    • Function: Used in transmission and large distribution substations for stepping up or down the voltage.
    • Variety: Available in a wide range of sizes and capacities, tailored to the specific needs of the substation, whether for high-power transmission or for specific industrial purposes.
  3. Circuit Breakers:

    • Function: Act as a protective device to interrupt power flows in case of an overload or short circuit.
    • Importance: Essential for protecting the substation equipment and the wider power grid from damage due to electrical faults.
  4. Disconnect Switches:

    • Function: Allow for the isolation of different parts of the substation for maintenance or in case of faults.
    • Role: Provide a means to safely disconnect equipment from the live power supply.
  5. Transformers for Voltage Measurement (Potential Transformers):

    • Function: Step down high voltages to lower, safer levels for measurement and monitoring purposes.
    • Use: Essential for the accurate measurement of line voltage, used in conjunction with metering and protective relays.
  6. Current Transformers:

    • Function: Transform high current levels to lower values for measurement, control, and protection.
    • Application: Used for monitoring the current flow and providing inputs for protective relays and metering equipment.
  7. Busbars:

    • Function: Conductors that serve as a common connection point for multiple circuits.
    • Role: Distribute power incoming from transformers to outgoing feeders.
  8. Grounding System:

    • Purpose: Ensure safety and protect equipment by providing a path for fault currents to ground.
    • Components: Includes grounding rods, conductors, and grids.
  9. Protective Relays and Control Equipment:

    • Function: Monitor the electrical parameters, detect abnormalities, and initiate protective actions.
    • Types: Include overcurrent relays, differential relays, distance protection, etc.
  10. Capacitor Banks:

    • Function: Improve power factor and voltage regulation, and reduce losses.
    • Location: Often found in substations serving industrial areas with large inductive loads.
  11. Auxiliary Power Supplies and Backup Generators:

    • Purpose: Provide power for control systems, lighting, and other essential functions during outages.
  12. Communication Equipment:

    • Role: Enable remote monitoring, control, and communication with the grid control center.
  13. Switchgear Housing:

    • Function: Encloses circuit breakers, disconnectors, and other control equipment.
    • Design: Varies from simple open-air setups to complex gas-insulated switchgear for space-saving and enhanced safety.

These elements work together to ensure the smooth operation of the substation and the wider power grid, providing necessary functions like voltage transformation, power distribution, system protection, and operational control.

Transformer Substation Maintenance

Transformer substation maintenance is crucial for ensuring the reliable operation and longevity of the electrical power grid. It involves a combination of preventive and corrective actions. Here’s an overview:

Preventive and Corrective Maintenance

  1. Preventive Maintenance: Regularly scheduled tasks to prevent equipment failures. This includes routine inspections, cleaning, testing, and proactive component replacement.
  2. Corrective Maintenance: Actions taken to repair or replace components after a fault or failure has occurred. This is often more time-consuming and costly than preventive maintenance.

Common Maintenance Tasks

  1. Inspection: Regular visual checks for signs of wear, corrosion, oil leaks, or damage to transformers, bushings, insulators, and other components.
  2. Testing: Includes electrical tests like insulation resistance, transformer oil testing (Dissolved Gas Analysis), and functional tests of protective devices.
  3. Cleaning: Removal of dirt, debris, and contaminants that can affect the performance and cooling efficiency of transformers and other equipment.
  4. Component Replacement: Proactive replacement of aging or worn parts, such as cooling fans, gaskets, bushings, and relays.

Specialized Maintenance Activities

  1. Thermographic Inspections: Identifying hot spots using infrared cameras to detect potential problems like loose connections, overloaded circuits, or insulation failures.
  2. Oil Analysis: Regular sampling and analysis of transformer oil for moisture content, acidity, dielectric strength, and presence of dissolved gases indicating potential internal faults.
  3. Load Testing: Ensuring transformers and other components can handle specified loads without overheating or voltage drops.
  4. Protection System Testing: Verifying the correct operation of relays, circuit breakers, and other protective devices.

Benefits of Regular Maintenance

  1. Increased Lifespan: Regular maintenance can significantly extend the operational life of substation components, reducing long-term costs.
  2. Improved Efficiency: Keeping equipment in optimal condition ensures efficient operation, reducing energy losses and operating costs.
  3. Reduced Risk of Failures and Outages: Proactive maintenance can prevent faults and failures, ensuring continuous and reliable power supply.
  4. Safety: Regular maintenance reduces the risk of accidents and injuries caused by equipment failure.
  5. Regulatory Compliance: Adhering to industry standards and regulations, avoiding potential fines or legal issues.

Maintenance Planning and Record Keeping

  • Scheduled Maintenance Plans: Regularly scheduled inspections and maintenance activities based on manufacturer recommendations and industry standards.
  • Maintenance Records: Detailed logs of all maintenance activities, including inspections, test results, and repairs, to track equipment history and plan future actions.

Regular transformer substation maintenance is a critical aspect of grid management, ensuring not only the reliability and efficiency of the power supply but also the safety of the personnel and the public. It requires a balance between routine preventive actions and timely corrective measures in response to emerging issues.

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.

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.