ELECTRIC, WITH AN EDGE

Transformer Mounting Pads

The Ultimate Guide to Transformer Mounting Pads

Transformer mounting pads are a crucial component in modern electrical distribution systems, especially in the USA. These pads provide a stable and secure base for pad-mounted transformers, which are essential for the efficient distribution of electricity. Pad-mounted transformers differ from their pole-mounted counterparts in several ways, most notably in their ground-level installation and enclosed housing. They are commonly used in both residential and commercial settings, where they play a vital role in stepping down high-voltage electricity for everyday use.

In this guide, we will delve into the various aspects of transformer mounting pads, including their purpose, types, safety considerations, and installation guidelines. Whether you are an industry professional, a curious homeowner, or someone with an interest in electrical infrastructure, this guide aims to provide comprehensive insights into the world of pad-mounted transformers.

DAELIM’s range of single and three phase pad mounted transformers is designed to meet the dynamic and diverse electrical needs of industries in the USA and Canada. Our products combine state-of-the-art technology with compliance to North American standards, ensuring reliable and efficient power distribution.

Core Products and Services

  • Quality Assurance: Each transformer undergoes rigorous testing under ISO 9001 quality management system.
  • Customization and Flexibility: Both single and three phase transformers can be customized to specific requirements.
  • Local Support: Backed by responsive and skilled support teams in the USA and Canada for installation and after-sales service.
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

  • Eco-Conscious Manufacturing: We use environmentally responsible materials and processes.
  • Energy Efficiency: Our transformers are designed for optimal performance, aligning with the energy efficiency goals of North American businesses.

Single Phase Transformer CESI

UL

CUL

ISO

CSA

SGS

Single Phase Pad Mounted Transformer

Single Phase Pad Mounted Transformer: Compact Power

  • Ideal for Residential and Light Commercial Use: Perfect for locations requiring a compact and efficient power solution.
  • Standards Compliance: Meets UL/CUL, NEMA, CSA, and ANSI standards, ensuring safety and reliability.
  • Customizable Solutions: Tailored to meet specific local power requirements and environmental conditions.

Three Phase Pad Mounted Transformer: Robust and Versatile

  • Suitable for Diverse Industrial Applications: Ideal for larger facilities needing a stable and high-capacity power supply.
  • Compliance with Industry Standards: Adheres to UL/CUL, NEMA, CSA, ANSI, DOE, and IEEE standards, reflecting our commitment to quality and performance.
  • Eco-Friendly and Safe: Manufactured with sustainable practices, ensuring minimal environmental impact.
Three Phase Pad Mounted Transformer

Table of Contents

What is a Single Phase Pad Mounted Transformer?

Single phase pad-mounted transformers are specialized electrical devices used primarily in residential areas or for light commercial applications. They play a crucial role in stepping down high voltage from the electrical grid to usable levels for homes and small businesses.

Single phase Pad mounted Transformer Specification

Rating

(kVA)

High voltage(kV)

No Load Loss

On load Loss

Height

(mm)

Depth

(mm)

Width

(mm)

Oil Weight(kg)

Total Weight(kg)

15 kVA

34.5/19.92

13.8/8

13.2/7.6

12.47/7.2

or others

50

195

840

740

610

45

294

25 kVA

80

290

840

740

610

68

362

37.5 kVA

106

360

840

760

610

75

476

50 kVA

135

500

840

810

610

93

553

75 kVA

190

650

840

860

610

132

672

100 kVA

280

1010

910

1200

965

230

714

167 kVA

435

1530

1000

1200

965

265

913

250 kVA

550

2230

1250

1300

1430

325

1106

Detailed Breakdown:

  • Design Characteristics:
    • Enclosed in robust, tamper-proof metal cabinets, often with a lockable security feature to prevent unauthorized access.
    • Compact in size, designed to blend into the landscape with minimal visual impact.
    • Noise reduction features are incorporated to minimize operational sound.
  • Technical Specifications:
    • Voltage handling capabilities typically range from 2400V to 34500V on the primary side.
    • Standard secondary voltage output is 120/240V, aligning with typical residential requirements.
    • Sizes and capacities vary, with most units ranging up to 500 kVA.
  • Safety and Compliance:
    • Designed with safety in mind, including features like fault protection and grounding systems.
    • Comply with industry standards such as ANSI, IEEE, and NEMA for operational safety and efficiency.

The following table is a factory test report for Daelim 14.4 kV 100 kVA single-phase pad-mounted transformer.

Single Phase Pad Mounted Transformer Specification

 

Rated Capacity

100

Product Type

ZGD-H- 100/14.4/0.24(0.12)

60HZ

Factory  Serial No.

DL2201026

3Voltage Combination

HV(kV)

14.4

Current

HV

6.94

Polarity

Ii6

 

Measurement of voltage ratio

Tapping Position

HV and LVThe Voltage Value of the Test The Grade and Accuracy:QJ3 5A

Grade 0.2

HV(kV)

LV(kV)

HV/LV(%)

1

15120

240

0.00

2

14760

0.00

3

14400

0.00

4

14040

0.00

5

13680

0.00

Measurement of winding resistance (Routine)

Tapping Position

Winding Resistance Measurement

KV-HV (Ω)

LV(Ω)

1

4.773

x1x2(Ω)

0.002009

2

4.659

x2x3 (Ω)

0.001322

3

4.544

4

4.432

x1x3 (Ω)

0.002972

5

4.313

The Meter NO. and Grade of Accuracy

BZC3395 Grade

0.2

Temperature

26℃

Humidity

46%

Measurement of winding resistance (Routine)

Test Items

No-Load Loss at rated voltage W

No-Load Current %

Measured Value

252

0.37

Load loss and Short circuit test.

Test Items

Load Loss at 85°C and rated voltage W

Total Loss W

Short Circuit Impedance at 85°C

Measured Value

946

1198

2.61

Applied voltage test

Power Frequency

withstand Voltage Test

x1x3Earthing

Test Time

60 S

The Test Voltage(kV)

10

Induced Over Voltage Withstand Test

Induced Over Voltage

Withstand Test

0.48(rms) for L.V. bushing at 120HZ 60S

Insulation Resistance test

location

Insulation Resistance( M Ω) at 15℃ R60

HV-E

0

LV-E

>2500

Leakage test  (Routine)

Test method

Applied pressure(kPa)

Duration(h)

Residual pressure(kPa)

Result

The static pressure

method

20

12

18

No leakage and no

damage

What is a Three Phase Pad Mounted Transformer?

Three phase pad-mounted transformers are more powerful and are used in commercial or industrial settings. These Transformer Mounting Pads are designed for environments that demand higher power and are essential for the efficient operation of large buildings, factories, and utility applications.

 

3-Phase Pad mounted transformer Specification

 

kVA

HV

LV

Total weigh

oil weight

75 kVA

25000Delta

480GrdY/277

1,400Kg

540KG

100 kVA

24900GrdY/14400

600V

729KG

138KG

150 kVA

14400V

600GrdY/347

2400kg

750L

200 kVA

13800V

380GrdY/220

2000kg

250kg

225 kVA

4160Delta

347GrdY/600V

2500KG

850L

300 kVA

34500V

208GrdY/120

2300kg

1025L

500 kVA

24940DELTA×12470DELTA

208GrdY/120

3050kg

1170L

625 kVA

13,800Delta

480GrdY/277V

2000KG

520KG

750 kVA

24940GrdY/14400

800GrdY/462

3100Kg

920L

1,000 kVA

13,200DELTA

480GrdY/277

8,360lbs

310GAL

1,250 kVA

25000V

416V

4000kg

1250L

1,500 kVA

4160GRDY/2400

600GrdY/347

4300kg

1400L

1,700 kVA

13,800Delta

480GrdY/277V

4600Kg

1050L

2,000 kVA

4160DELTA

415GrdY/240

4600Kg

1280L

2,500 kVA

25000DELTA

600GrdY/347

5850Kg

1680L

2,550 kVA

12470DELTA

415GrdY/240

5800Kg

1750L

2600 kVA

34500DELTA

416GrdY/240

6350Kg

1940L

2800 kVA

21000V

480V

13669lb

489gal

3000 kVA

13800V

415V

6700Kg

1885L

4000 kVA

34,500DELTA

12,470DELTA

9,500Kg

3560L

5000 kVA

22860GrdY/13200

4160GrdY/2400

9100Kg

2435L

7000 kVA

27,600DELTA

13,800DELTA

11600kg

2820L

7500 kVA

249400DELTA

4.16kv Wye

12000 Kg

3000KG

10000 kVA

24900GrdY/14400

600V

15000Kg

3000L

Detailed Breakdown:

  • Capacity and Power Efficiency:
    • Typically, these Transformer Mounting Pads have a capacity range from 75 kVA to 5000 kVA, designed to handle higher load requirements effectively.
    • They are more efficient in managing power distribution in three-phase electrical systems.
  • Construction and Design:
    • Encased in durable, weather-resistant enclosures to withstand environmental stressors.
    • Equipped with advanced cooling systems to handle the heat generated during operation.
    • Include safety features like pressure relief devices and fault protection mechanisms.
  • Application-Specific Customization:
    • Available in various configurations to meet specific voltage and power requirements.
    • Commonly used in sectors that require a reliable and uninterrupted power supply.
  • Environmental and Safety Compliance:
    • Compliant with strict safety and environmental standards.
    • Often equipped with oil containment and spill prevention systems to minimize environmental impact.

Durability of Pad-Mounted Transformers

Transformer Mounting Pad

Overview and Lifespan

  • Expected Lifespan: Pad-mounted transformers in the U.S. are generally designed for a service life of 25 to 50 years. However, this can vary based on several factors.

Key Factors Affecting Lifespan

  • Maintenance Quality: Regular, comprehensive maintenance can extend a transformer’s life significantly. For example, a well-maintained transformer could potentially exceed its expected lifespan, while neglected units might fail prematurely.
  • Environmental Impact: Harsh environmental conditions like extreme temperatures, humidity, and pollution can accelerate aging. Transformer Mounting Pads in more stable environments tend to last longer.
  • Operational Load: Consistent operation at or near full capacity can lead to quicker degradation compared to those used under moderate loads.

Safety of Pad-Mounted Transformers

Safety Features and Compliance

  • Design and Construction: U.S. standards, such as those set by the American National Standards Institute (ANSI) and the Institute of Electrical and Electronics Engineers (IEEE), dictate stringent requirements for the design and construction of pad-mounted transformers to ensure safety.
  • Public Safety Protocols: Measures like secure, lockable enclosures and warning signage are mandated to prevent unauthorized access and accidents.

Regulations on Proximity to Buildings

  • Distance Standards: The National Electrical Safety Code (NESC) and local building codes typically specify the minimum safe distance between a pad-mounted transformer and nearby structures. For instance, a common guideline is a clearance of at least 3 meters from buildings, ensuring safety and accessibility for maintenance.

Installation Guidelines for Pad-Mounted Transformers

Anchoring and Positioning

Anchoring the Transformer:

  • Foundation Standards: According to ANSI and IEEE standards, a solid concrete foundation is essential for stabilizing the Transformer Mounting Pad. This ensures it remains anchored against environmental factors like wind or flooding.
  • Securing to the Pad: The Transformer Mounting Pad should be bolted securely to the pad, as per the manufacturer’s guidelines and ANSI/IEEE standards. This is crucial for both stability and safety.

Positioning and Compliance:

  • Proximity to Buildings: The National Electric Code (NEC) and local building codes provide specific guidelines on the placement of pad-mounted transformers. For example, a common requirement is maintaining a minimum distance of 3 meters from any structure to ensure safety and accessibility.
  • Accessibility: Adequate space around the transformer is mandated for safe and efficient maintenance and emergency access, in compliance with OSHA (Occupational Safety and Health Administration) standards.

These guidelines and standards ensure the safe and efficient installation of pad-mounted transformers, adhering to the requirements set by U.S. regulatory bodies.

Detailed Installation Methods for Pad-Mounted Transformers

Step-by-Step Installation Process

  1. Site Preparation:
    • Evaluate and prepare the installation site, ensuring level ground and proper drainage.
    • Determine the location based on proximity to load points and accessibility for maintenance.
  2. Foundation Construction:
    • Construct a robust concrete foundation, following local building codes and ANSI/IEEE standards.
    • The foundation must be of appropriate dimensions and depth to support the weight and size of the transformer.
  3. Transformer Placement and Anchoring:
    • Carefully place the transformer on the concrete pad using appropriate lifting equipment.
    • Securely bolt the transformer to the pad, ensuring stability and alignment.
  4. Electrical Connections:
    • Follow manufacturer guidelines and NEC standards for making electrical connections.
    • Implement proper grounding techniques as per IEEE guidelines.
  5. Safety and Compliance Checks:
    • Conduct a thorough inspection to ensure compliance with all relevant safety standards and regulations.
    • Verify clearances around the transformer as mandated by the NESC.

Comprehensive Overview of Pad-Mounted Transformer Types

Single-Phase Pad-Mounted Transformer

  1. Design and Application:
    • Specifically designed for residential use with lower kVA ratings.
    • Compact and aesthetically designed to blend into residential settings.
  2. Technical Specifications:
    • Voltage ratings typically range from 2400V to 34500V on the primary side and 120/240V on the secondary.
    • Equipped with load tap changers to adjust voltage levels as per demand.
  3. Safety Features:
    • Built with lockable, tamper-proof enclosures.
    • Includes fault and surge protection mechanisms.

Three-Phase Pad-Mounted Transformer

  1. Industrial and Commercial Use:
    • Higher capacity Transformer Mounting Pads designed for commercial and industrial applications.
    • Can handle significant load variations and high power demands.
  2. Advanced Design Features:
    • Equipped with cooling systems for efficient heat dissipation.
    • Robust construction to withstand environmental stressors.
  3. Customization and Compliance:
    • Customizable for specific voltage requirements and applications.
    • Compliant with stringent safety standards like ANSI and IEEE.

Environmental Impact and Regulations for Pad-Mounted Transformers in the United States

Compliance with Environmental Standards

  1. EPA Guidelines:
    • The Environmental Protection Agency (EPA) sets forth regulations concerning the use of hazardous substances in transformers, including restrictions on PCBs.
    • For detailed regulations, you can refer to the EPA’s website at EPA Regulations.
  2. Noise Pollution Standards:
    • Local ordinances often dictate noise pollution standards. For example, the Noise Control Act and the Quiet Communities Act provide a framework for noise control.
    • Specific standards can be found at Noise Pollution Laws.
  3. Cooling and Heat Dissipation Compliance:
    • ANSI/IEEE standards, such as IEEE C57.12.00 for general requirements of transformers, specify permissible temperature rises and cooling methods.

These standards ensure transformers operate within safe thermal limits, minimizing environmental impact. For more information, see IEEE Standards.

ANSI/IEEE Standards on Temperature Rise and Cooling Methods for Pad-Mounted Transformers

Understanding ANSI/IEEE Temperature and Cooling Standards

  1. ANSI/IEEE Standards Overview:
    • The American National Standards Institute (ANSI) and the Institute of Electrical and Electronics Engineers (IEEE) have established standards for transformer temperature rise and cooling methods.
    • Key standards include IEEE C57.12.00 (general requirements for liquid-immersed distribution, power, and regulation transformers) and IEEE C57.12.90 (test code for liquid-immersed distribution, power, and regulation transformers).
  2. Temperature Rise Specifications:
    • These standards specify the maximum allowable temperature rise for transformers under normal operating conditions.
    • Temperature rise limits are set to ensure reliability, efficiency, and longevity of transformers, typically not exceeding 65°C over ambient temperature for oil-immersed transformers.
  3. Cooling Method Guidelines:
    • Standards provide guidelines for different cooling methods, including self-cooled, air-cooled, and liquid-cooled systems.
    • The choice of cooling method affects the transformer’s capacity and efficiency, with specific design considerations for each method to ensure proper heat dissipation.

For detailed information on these standards, industry professionals and interested parties can refer to the IEEE Standards Association website at IEEE Standards.

Local Utility Company Grid Connection Guidelines: Texas, California, Florida

Texas Grid Connection Guidelines

  1. ERCOT Standards:
    • In Texas, the Electric Reliability Council of Texas (ERCOT) sets guidelines for grid connection.
    • These include specifications on voltage levels, phase synchronization, and frequency stability.

More information is available at ERCOT.

California Grid Connection Guidelines

  1. CAISO Regulations:
    • The California Independent System Operator (CAISO) oversees grid connection standards in California.
    • Focuses on renewable integration, voltage control, and phase balancing.

Details can be found at CAISO.

Florida Grid Connection Guidelines

  1. Florida PSC Rules:
    • In Florida, the Public Service Commission (PSC) regulates transformer connections to the grid.
    • Emphasizes on safety, reliability, and compatibility with existing grid infrastructure.
    • Further information is accessible at Florida PSC.

These regional guidelines highlight the importance of adhering to local utility standards to ensure safe and efficient grid integration for pad-mounted transformers.

National and State-Specific Electrical Codes in the Top Ten U.S. States for Pad-Mounted Transformers

Understanding the specific electrical codes in each state is crucial for the correct installation and operation of Transformer Mounting Pads. While these codes are generally aligned with the National Electrical Code (NEC), each state has its unique amendments and specifications.

Examples of State-Specific Codes:

  1. California (CA): California Electrical Code (CEC) – Incorporates NEC with state-specific amendments. Focuses on earthquake safety measures and renewable energy integration.
  2. Texas (TX): Texas Electrical Code – Aligns with NEC, with additional regulations for extreme weather conditions and energy efficiency standards.
  3. Florida (FL): Florida Building Code – Includes NEC standards and emphasizes hurricane-resistant construction practices.

Other states like New York (NY), Pennsylvania (PA), Illinois (IL), Ohio (OH), Georgia (GA), North Carolina (NC), and Michigan (MI) also customize their electrical codes based on the NEC, tailoring them to local environmental conditions and specific energy needs.

Professionals installing Transformer Mounting Pads must reference their specific state’s building code for detailed regulations, ensuring compliance with both national and localized standards.

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