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ground-mounted-transformers

14+FAQ ABOUT THE GROUND-MOUNTED TRANSFORMERS

When it comes to public transformer placement,  ground-mounted transformers and three-phase pad-mounted transformers are quite similar to pole-mounted transformers since these transformers are commonly seen on public, which is why learning the pad-mounted transformer diagram is a great way to understand how these transformers are safe in public

With the help of DAELIM, a company that has been manufacturing ground-mounted transformers for decades, you will be able to understand what this electric device is capable of, and if you should consider purchasing one for your project.

Choosing the right transformer manufacturer is also just as important as choosing the right type of transformer. High-quality transformers will go for as long as 40 years if manufactured professionally, and regularly maintained by the owner.

The Complete Guide to Ground Mounted Transformer

Core Products and Services

  • Industry Expertise: Leveraging years of experience in transformer design and manufacturing.
  • Quality Assurance: Rigorous testing and quality control measures, backed by certifications and warranties.
  • Customer Support: Strong after-sales service, technical support, and customer-focused approach.
Substation-Transformer
Single-Phase-Pad-Mounted-Transformer
Single Phase Transformer
Pad Mounted Transformer
dry type transformer
Distribution Transformer
220kv Power Transformer
69kv Power Transformer

Adherence to Standards

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 CESI

UL

CUL

ISO

CSA

SGS

Pad-mounted Transformer

We can provide you single phase and three phase pad mounted transformer

Dry-type Transformer

Type:Cast resin; Rated Capacity: Up to 25MVA; Rated Voltage: Up to 36KV;

Pole Transformer

TypeCSP type Frequency: 50/60Hz; Rated Power: 5~167kva

Dry-type Transformer

Frequency: 50/60Hz Rated voltage:10kv, 20kv,30kv Rated Power: 400~2500kva

GROUND-MOUNTED TRANSFORMER : The Ultimate FAQ Guide

What are Mounted Transformers?

Since this article will be focusing on two types of mounted transformers, which is the ground-mounted transformer and pole-mounted transformer, it is best to learn first why they are called mounted transformers.

Basically, transformers are usually seen on the ground, whether it is near a building, inside a power plant, or some remote area. The point is that transformers are basically seen standing in their place or on the ground.

2000 kva Transformer
2000 kva Transformer

Whereas mounted transformers are specifically mounted on to something while they are operating. They are leveraged to operate efficiently, this is why their sole purpose and design has a mounting utility on it.

What Are Ground-mounted Transformers?

Ground-mounted transformers are basically transformers that are placed on a concrete pad that is mounted to the ground. These are distribution transformers with a kV rating that is significantly lesser than typical distribution transformers.

This is because their build or construction is much smaller than normal transformers that can fit in more components that is a major contributor to the increase in kVA rating (kilovolt-ampere). Moreover, the material of the plate or pad that it is settled in can be made out of solid wood or concrete since these are non-conductive materials.

Enclosure

When it comes to the Ground-mounted transformer’s enclosure, they basically look like a small or big cabinet since there are ground-mounted transformers that can be as small as a storage box and some can be as big as a locker.

Regardless of the size, they are normally seen in a locked metal cabinet and the purpose of this is to keep people, animals, debris, and other outside elements from tampering with it while it is operating.

Small or big, ground-mounted transformers will always have a pad underneath them.This makes them easy to identify and distinguish among other transformers.

Operation

ground-mounted transformers have a unique working principle that allows primary cables to be connected with help of elbow connectors. This will be operated when it is energized, and with a use of a hot stick. Moreover, this enables users to repair and do maintenance much easier.

Ground-mounted transformers are also known to have underground connections, specifically underground utility lines that lead to service drops, which is an overhead electrical line that is running from a utility pole towards a consumer’s house or establishment.

The main function of this is to do what distribution transformers usually do, which is to decrease or “step down” the primary voltage on the utility distribution lines that is direct to a lower voltage. Specifically a lower secondary voltage for supplying consumer needs.

This is why ground-mounted transformers are able to supply electricity to numerous buildings, which is why it is not surprising to see a single ground-mounted transformer supplying a single household or large building.

This is why a lot of consumers, businesses, and companies prefer ground-mounted transformers since they are of the right size, easy to operate, and have the ability to provide sufficient electricity, which is good for almost any kind of project.

Get the most complete Pad Mounted Transformer information now!

Area

In terms of the area of where ground-mounted transformers should be placed, a lot of consumers tend to ask whether they can be placed indoors and underground, but you will get to know the answer to that in the frequently asked questions section.

Focusing on where you can commonly find ground-mounted transformers, as mentioned they can be seen almost anywhere in public. Some are even near pedestrian lanes, which does make you think if it is just safe to pass by or pass through.

Maintenance Procedures for Pad Mounted Transformers

Daelim's pad mounted transformer installed in Honduras
Daelim's pad mounted transformer installed in Honduras

Basically, it is not uncommon for ground-mounted transformers to be seen in residential areas. This is actually the reason why this type of transformer is also called “residential pad transformers” since it is normal for them to be seen in people’s front yards or front lawns.

The reason why they can be seen outdoors and near buildings is because unlike other types of transformers, ground-mounted transformers have their contact points that are live stored in a grounded metal box. The result of this makes the overall transformer safe to showcase or present in public areas, including houses that are close together in residential areas.

As you may have observed with other transformers, specifically ones that are not suitable for public locations, they are normally seen enclosed in a metal fence to protect pedestrians from coming in. 

When it comes to ground-mounted transformers this is simply not necessary. However, you do normally see them with a safety lock to avoid pedestrians from tampering with it..

What is a Single-phase Ground-mounted Transformer?

Single Phase Pad-Mounted Distribution Transformer near house
Single Phase Pad-Mounted Distribution Transformer near house

Single-phase ground-mounted transformers enable vertical feed to the primary and secondary bushings of the transformer. Single-phase ground-mounted transformers are the ones you normally see on industrial and residential applications. Because of this, there is a wide range of kVAs required and as well as a lot of cable involved.

Moreover, single-phase ground-mounted transformers accept single-phase alternating current (A.C) power. This involves the output for the single-phase A.C power that is usually between a higher or lower voltage level.

During this process, energy is also transferred from one circuit to another through the law of electromagnetic induction.

11+FAQ ABOUT THE SINGLE PHASE PAD-MOUNTED TRANSFORMER

What is a Three-phase Pad-mounted Transformer?

When it comes to Three-phase pad-mounted transformers, the distinct difference between them compared to single-phase ground-mounted transformers is that they are used to change voltages with three phases.

Basically, three-phase pad-mounted transformers go through this process. This means that they are commonly used for power generation and as well as electrical distribution network applications.

2021 Ultimate Dry Type Cast Resin Transformer Guide

What is a Pad-mounted Transformer Diagram?

A pad-mounted transformer diagram refers to what the transformer itself does, and as well as how it works. As mentioned, ground-mounted transformers are operated with the help of underground electric power distribution lines at service drops, which is to step down the primary voltage to the lower secondary voltage to provide consumers electricity.

Those big green metal utility boxes in the streets of towns and residential areas are ground-mounted transformers that are operating to lower high voltage to standard consumer voltage.

Part worth noting of the pad-mounted transformer diagram is that these transformers are not in any way protected like the way overhead lines and substations are.

What Are Pole-mounted Transformers?

Basically, pole-mounted transformers are those barrel-shaped objects that you usually see at electricity poles or utility poles. Pole-mounted transformers are also part of the distribution transformer category but instead of being planted on the ground, these transformers are mounted on an electric service pole that is made out of concrete or wood.

In terms of their height in a utility pole, these are leveled with electric wires, which is the reason why you see a lot of wires connected to a single pole-mounted transformer.

The Complete Guide to Pole-Mounted Transformer

50 kva pole mounted transformer price
50 kva pole mounted transformer price

What is the Rating of Pole-mounted Transformers?

The usual rate of Pole-mounted transformers range from 16 kilovolt amperes to 100 kilovolt amperes. It may not seem much but in terms of how much electricity they can transform, they have the ability to shrink 11,000 Volts – 33, 000 Volts to 400 Volts. They may be small, but there is no question about their ability to do that.

Another use case for pole-mounted transformers is converting distribution voltages to the 120/240 rate of the power system. This is the common rate that is used by consumers such as houses and other small to medium sized establishments.

Seven Technical parameters of Pad-mounted Transformers

What Is Inside a Pole-mounted Transformer?

For starters. pole-mounted transformers are considered as static devices that have no moving parts in them, but this does not mean that they are completely inside. Like most transformers, pole-mounted transformers have a magnetic core that is generated from laminations of silicon sheet steel. This is also known as “transformer steel”. The arrangement of this setup is stacked with the primary and secondary wire windings wrapped around them.

parts of pole-mounted transformer
parts of pole-mounted transformer

What are the Wires Connected to a Pole-mounted Transformer?

Each building or establishment may or may not have a transformer drum in their vicinity and it is mounted to a utility pole. However, this is not always the case for pole-mounted transformers since they can be located underground if buildings are too close to each other, like suburban neighbourhoods. Each house will have a transformer box underneath them.

2021 Ultimate 3 Phase Transformer Chart Guide

What is the Main Difference between Single-phase and Three-phase?

For starters, single-phase, like single-phase ground-mounted transformers, need two wires. On the other hand three-phase, like three-phase pad-mounted transformers need three or four wires.

Single-phase ground-mounted transformers simultaneously change the supply voltage of an alternating current power by a system.

Furthermore, single-phase power is a two-wire A.C power circuit while three-phase is a three-wire A.C power circuit. In terms of the three-wire A.C power circuit, each phase is expected to be 120 electrical degrees apart

Are Ground-mounted Transformers Hazardous?

Basically, the design of ground-mounted transformers is what makes it a safe public transformer. This goes to show that ground-mounted transformers do not pose a threat to people who are standing near it or passing by.

But for the safety of the pedestrians, it is best to avoid contact with a ground-mounted transformer. Better yet, put a warning sign near since children might play around with it or worse, play on top of it.

The safe distance recommended is at least 3 letters from any ground-mounted transformer.

How to ground the pad-mounted substation?

Can Ground-mounted Transformers Be Placed Indoors?

When it comes to transformers that can be placed indoors, people who have knowledge about transformers would usually think of dry-type transformers as a best example for indoor placement.

However, for ground-mounted transformers, this usually depends on the transformer if its rating meets the safety standard of the establishment. Since ground-mounted transformers make use of transformer oil or mineral oil, this means that they are highly flammable.

Public buildings have fire codes with them, so depending on the rating and fire code of the building, ground-mounted transformers may or may not be placed indoors.

2021 Ultimate Different Types of Transformer Guide

What is the Difference Between Indoor and Outdoor Transformers?

Aside from the obvious and simple explanation that indoor transformers are specifically for indoors, while outdoor transformers are specifically for outdoors, there are standards to consider to declare if a transformer belongs to the indoor or outdoor transformer category.

For ground-mounted transformers, it is best to locate them outdoors. They are highly flammable so it’s best to keep them out of establishments. Nevertheless, it is not worth taking the time to worry about its condition outdoors since the design is very solid.

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In-Depth Guide to Ground Mounted Transformers

Install Pad-mounted Transformer
Install Pad-mounted Transformer

Ground Mounted Transformer Wiring: A Step-by-Step Guide

Implementing wiring for ground mounted transformers requires careful planning and execution. Here’s a detailed guide:

  1. Site Assessment: Conduct a thorough evaluation of the installation site. Check for factors like soil stability, proximity to buildings, and accessibility for maintenance.
  2. Safety Precautions: Before beginning the installation, ensure all safety protocols are in place, including proper grounding and isolation from live circuits.
  3. Input Line Connection: Securely connect the high voltage lines, adhering to national and local electrical standards. Use appropriate insulators and protective gear.
  4. Output Line Setup: Arrange the low voltage output lines, ensuring they are correctly insulated and routed to avoid electrical hazards.
  5. Grounding Implementation: Establish a comprehensive grounding system, which is critical for safety and effective operation. This involves connecting the transformer to the earth using grounding rods or plates, ensuring a low-resistance path to ground.
  6. Installing Switchgear and Fuses: Position these components strategically for operational efficiency and ease of future maintenance.

Practical Insights: Ground vs. Pad-Mounted Transformers

Choosing between ground and pad-mounted transformers depends on specific site requirements and usage scenarios:

  • Space and Aesthetics: Pad-mounted transformers, being compact and aesthetically designed, are preferred in urban or residential areas where space is a premium. Ground mounted transformers are more suited for industrial or rural areas where space is not an issue.
  • Accessibility and Maintenance: Ground mounted transformers are typically easier to service due to their open design. This is beneficial in industrial settings where regular maintenance checks are common. Pad-mounted transformers, with their enclosed and secure design, are better in public spaces but may require more effort to access for maintenance.

Real-World Application: Common Scenarios and Solutions

  • Industrial Setting: In an industrial complex requiring a high-capacity transformer, a ground mounted unit was selected for its easy accessibility and suitability for heavy loads. The installation process involved:
    1. Customized wiring to handle high power demands.
    2. Enhanced safety protocols, including robust grounding and secure fencing around the transformer.
    3. A maintenance plan that includes regular checks and quick access to switchgear and fuses for operational efficiency.
  • Residential Area: A residential community needed a transformer that was safe and unobtrusive. A pad-mounted transformer was chosen for its compact size and aesthetic casing. Key steps in the installation included:
    1. Strategic placement to minimize visual impact while ensuring safety.
    2. Implementation of tamper-proof locks and safety signage.
    3. Coordination with local utility companies for grid integration and compliance with neighborhood regulations.

Market Overview and Practical Considerations for Ground Mounted Transformers in the U.S

Ground mounted transformer wiring cabinet diagram
Ground mounted transformer wiring cabinet diagram

The U.S. Market for Ground Mounted Transformers

The U.S. market for ground mounted transformers is diverse and dynamic, catering to a wide range of applications from residential to industrial. Key trends in this market include:

  1. Demand for Energy-Efficient Models: With increasing focus on energy efficiency, there's a growing demand for transformers that offer higher efficiency ratings and lower losses.
  2. Technological Advancements: Innovations in transformer design and materials are leading to more compact, durable, and environmentally friendly models.
  3. Regulatory Compliance: Compliance with stringent regulations such as those set by the Environmental Protection Agency (EPA) and local electrical codes is a significant consideration for manufacturers and users.

Ground Mounted Transformer Manufacturers

Several manufacturers are prominent in the U.S. market, known for their quality and reliability. Among them:

  • Daelim: Daelim is recognized for producing high-quality ground mounted transformers that meet rigorous standards. Their products are known for durability, efficiency, and adherence to U.S. and international standards.
  • Other Notable Manufacturers: Include companies like ABB, Siemens, and General Electric. These manufacturers offer a range of transformers suitable for various applications, from small residential units to large industrial transformers.

Purchasing Considerations

When purchasing a ground mounted transformer in the U.S., consider the following:

  • Capacity Needs: Determine the transformer capacity based on the power requirements of the end use. This involves calculating the total load and considering future expansion needs.
  • Local Regulations: Ensure the transformer complies with local and national regulations, including safety and environmental standards.
  • Manufacturer Reputation and Support: Choose manufacturers with a strong reputation for quality and reliability, and who offer good customer support and warranty terms. Daelim, for example, is a choice many consider for their commitment to quality and customer service.

Case Example: Implementing a Ground Mounted Transformer in a Commercial Setting

A recent implementation in a commercial complex in California provides a practical example:

  • Initial Assessment: The project involved assessing the site’s power needs, considering factors like peak load, future expansion, and local electrical codes.
  • Selection Process: After evaluating several models, a Daelim ground mounted transformer was chosen for its efficiency, compliance with California’s stringent environmental regulations, and the manufacturer's solid reputation.
  • Installation and Compliance: The installation followed a detailed plan, ensuring compliance with state and federal regulations. It included coordination with local utility providers, setting up appropriate safety measures, and establishing a maintenance schedule for long-term operational efficiency.

Transformer Capacity and Residential Coverage

Understanding Transformer Capacity: A Practical Approach

Transformer capacity, measured in kilovolt-amperes (kVA), is a critical factor in determining which transformer is suitable for a specific application. Here's how to practically approach this:

  1. Assessing Load Requirements: Begin by calculating the total electrical load of the area or facility. This includes summing up the power requirements of all devices and systems that will be connected to the transformer.
  2. Future-Proofing: Consider future expansion or additional load that might be added. It's practical to choose a transformer with a capacity slightly higher than the current requirement to accommodate growth.
  3. Safety Margins: Always include a safety margin in your calculations to prevent overloading the transformer, which can lead to failures or reduced lifespan.

Real-World Application: Residential Coverage

How many houses can a transformer supply? This is a common question and the answer varies based on the transformer's capacity and the average household consumption.

  • 50 kVA Transformer: Typically, a 50 kVA transformer can supply around 10 to 15 average-sized homes, depending on the average electrical consumption per house.
  • 100 kVA Transformer: A 100 kVA transformer, on the other hand, can cater to approximately 20 to 30 homes.

Case Scenario: Suburban Neighborhood

  • Situation: A new suburban development required a transformer to power 25 homes.
  • Solution:
    1. A 100 kVA ground mounted transformer was selected, providing enough capacity with a margin for potential future expansion.
    2. The installation plan included assessing the site layout, ensuring optimal placement for accessibility and safety, and planning for underground cabling to each home.
    3. Compliance with local electrical codes and coordination with the utility company were integral parts of the project.

Tips for Choosing the Right Transformer

  • Consult with Experts: Engage with electrical engineers or consult with transformer manufacturers like Daelim for tailored advice.
  • Review Local Regulations: Ensure that the transformer type and installation comply with local building codes and electrical standards.
  • Consider Environmental Factors: For areas with specific environmental conditions, choose transformers designed to withstand such environments.

Safety and Regulatory Compliance for Ground Mounted Transformers in the U.S.

In the United States, the installation and operation of ground mounted transformers are governed by a set of stringent regulations and standards to ensure safety and efficiency. Key regulations include:

  1. National Electric Code (NEC): Provides guidelines on installation requirements, grounding, and safety precautions for transformers.
  2. Occupational Safety and Health Administration (OSHA): Sets standards for safe working conditions around electrical equipment, including transformers.
  3. Environmental Protection Agency (EPA): Regulations concerning environmental impacts, particularly for transformers containing oils or chemicals.

Practical Implementation: Ensuring Compliance

To effectively meet these regulations, consider the following steps:

  1. Compliance with NEC: Ensure all aspects of the transformer’s installation comply with the NEC. This includes proper grounding, safe distances from structures, and adequate protective measures.
  2. OSHA Standards for Worker Safety: Follow OSHA guidelines during installation and maintenance to protect workers from electrical hazards.
  3. Environmental Considerations: If the transformer contains potentially hazardous materials, adhere to EPA guidelines for handling and disposal.

Case Example: Commercial Facility Upgrade

  • Situation: A commercial facility in Ohio needed to upgrade its transformer to a higher capacity model.
  • Solution:
    1. Selection of Transformer: A 150 kVA ground mounted transformer was chosen for its capacity and efficiency.
    2. NEC Compliance: The installation plan included spacing as per NEC guidelines, proper grounding techniques, and protective barriers around the transformer.
    3. OSHA Compliance: During installation, OSHA standards for electrical safety were strictly followed, including proper signage, safety gear for workers, and ensuring a safe working distance from energized parts.
    4. Environmental Safeguards: Since the transformer contained oil, EPA guidelines for containment and spill prevention were incorporated into the design.

Tips for Compliance and Safety

  • Consult with Local Authorities: Before installation, consult with local building inspectors or electrical authorities to ensure compliance with all relevant codes and regulations.
  • Regular Inspections and Maintenance: Establish a routine for inspections and maintenance, adhering to the manufacturer’s guidelines and safety standards.
  • Stay Informed on Updates: Regulations and standards can change. Stay informed on the latest updates to ensure ongoing compliance.

Electrical Department Contact Information

California Public Utilities Commission
California Public Utilities Commission

California

  • California Public Utilities Commission (CPUC)
    • Website: www.cpuc.ca.gov
    • Contact Number: (800) 649-7570
    • Email: public.advisor@cpuc.ca.gov

Texas

  • Public Utility Commission of Texas
    • Website: www.puc.texas.gov
    • Contact Number: (512) 936-7000
    • Email: customer@puc.texas.gov

Florida

  • Florida Public Service Commission
    • Website: www.floridapsc.com
    • Contact Number: (800) 342-3552
    • Email: contact@psc.state.fl.us

Finding Contact Information for Other States

For other states, the contact information for local electrical departments can be found through the following steps:

  1. State Government Website: Visit the official state government website. Most states have a dedicated section for public utilities or energy departments.
  2. Public Utility Commission: Look for the state’s Public Utility Commission or an equivalent regulatory authority. These commissions often oversee electrical and utility matters.
  3. Local Utility Companies: Contact local utility companies. They can provide information or direct you to the appropriate state department responsible for electrical regulations.
  4. State Electrical Licensing Boards: Some states have electrical licensing boards which can provide guidance on regulations and compliance.
  5. Online Directories: Use online directories or government resource websites that list contact information for state departments.

Final Thoughts about Ground-mounted Transformers

There is no doubt here that ground-mounted transformers are excellent transformers. But if your project requires higher voltage levels, then it is best to choose pure distribution transformers or power transformers.

But if your project only requires electricity that can provide one to multiple buildings, then ground-mounted transformers are definitely for you. They are small, easy to operate, and safe to place outdoors.

Should you have any questions or concerns, please do not hesitate to contact DAELIM’s team of professionals for professional help.