3 Phase Pad Mounted Transformer
Pad mount transformers are an essential part of modern distribution networks and are used in modern underground distribution power systems. They provide efficient and reliable power distribution in a variety of environments, including residential, commercial, energy storage, tram, ultility, etc. They are widely used in the Americas region due to their durability, easy maintenance, and safety features. This article explores the intricacies of 3 phase pad mounted transformers, detailing their types, configurations, applications, technical specifications, and industry standards.
Definition and Types
A 3-phase pad-mounted transformer is an outdoor electrical transformer that includes a transformer unit and a cable compartment. It is available in live front or dead front configurations and is designed for installation directly on the ground without additional protective enclosures. This design ensures durability and facilitates ease of maintenance.
Two primary types of 3-phase pad-mounted transformers are loop feed and radial feed.
Loop feed transformers utilize six high-voltage bushings, enabling dual power supply configurations. This redundancy allows unaffected transformers to maintain continuous power supply in case of a fault, ensuring reliability in critical applications.
Radial feed transformers, on the other hand, feature three high-voltage bushings and provide a single-circuit power supply. While simpler in design, they require careful planning to minimize outage impacts during maintenance or failures.
Learn more: A Guide to Radial Feed and Loop Feed Transformers
Standards
CSA C227.4 and C227.5
Specifies requirements for 3 phase pad mount transformers, including design, safety, and performance criteria.
Ensures interoperability and safety across Canadian markets.
IEEE C57.12.34
Similar requirements as CSA but with stricter energy efficiency guidelines as per US DOE regulations.
Focuses on technical specifications to ensure reliability and high performance.
Technical Specifications
Electrical Properties
Capacity (kVA): Range from 45 kVA to 10000 kVA, catering to various power distribution needs.
Primary Voltages: Includes configurations like 2400V, 4800V, 7200V, 12470V, 13800V, 14400V and 34500V, with options for different connection methods.
Daelim Transformer’s 3 phase pad mounted transformer can achieve a voltage level of 44kV with UL listed.
Mechanical Properties
Dimensions: Compact designs suitable for outdoor installations, with robust construction to withstand harsh environmental conditions. There are strict specific dimensions for 3 phase pad mount transformer with high voltage connectors for different standards, voltage levels and terminal types. And the CSA C227.4 standard also clearly stipulates the physical sizes of transformers, you can refer to Table 8 of the standard.
Temperature Range: Operates from -40°C to 60°C, ensuring reliability in diverse climates.
3 Phase pad mounted transformer sizes
| CSA Standard Size | IEEE Standard Size |
| 75 kVA | 45kVA, 75kVA , 112.5kVA ,150 kVA |
| 150 Kva | 225 kVA,300kVA,500kVA |
| 225 kVA | 750 kVA |
| 300 kVA | 1000 kVA |
| 500 kVA | 1500 kVA |
| 750 kVA | 2000 kVA |
| 1000 kVA | 2500 kVA |
| 1500 kVA | 3750 kVA |
| 2000 kVA | 5000 kVA |
| 2500 kVA | 7500 kVA |
| 3000 kVA | 10000 kVA |
Learn more:Ultimate Guide To Transformer Sizes and Ratings
Daelim is the world's top professional supplier of pad mounted transformers. We can not only provide pad mounted transformers of the above standard sizes, but also design various sizes according to your requirements.
For example, we have customized for customers in North America and South America: 1600kva, 1700kva, 1800kva, 2550kva, 2800kva, 4000kva, 7000kva, and other sizes, and the maximum can reach 10000kva.
If the above cannot meet your requirements, please send your requirements to 678-548-5339 or pinruidan@daelim-electric.com.
- Primary Voltage Ratings: 34500Delta
- Secondary Voltage Ratings: 415GrdY/240V
- H.V. TAP RANGE: +/- 2@ 2.5% LV taps
- CONNECTION TYPE: Dyn1
- TYPE: Dead Front loop feed HV & LV configuration
- BIL: 150/30kV
- Standards: IEEE, ANSI, NEMA
- Application: Data Center
- Power Rating: 2550 kVA/3300kVA
- Certificate: UL
- Cooling Method: ONAN/ONAF
- Primary Voltage Ratings: 34.5kV
- Secondary Voltage Ratings: 480V/277
- H.V. TAP RANGE: +/- 2@ 2.5% HV taps
- TYPE: Pad mount
- BIL: 150/30kV
- Standards: IEEE, ANSI, NEMA
- Application: BESS (Megapack)
- Power Rating: 4800kVA
- Certificate: UL
- Cooling Method: KNAN
- Primary Voltage Ratings: 12000 Delta
- Secondary Voltage Ratings: 480GrdY/277
- H.V. TAP RANGE: +/- 2@ 2.5% HV taps
- TYPE: Pad mount
- BIL: 30/90kV
- Standards: IEEE, ANSI, NEMA, ASTM
- Application: EV Charging
- Power Rating: 5000kVA
- Certificate: UL
- Cooling Method: ONAN
3 Pase Pad Mounted Transformer Application Case
Daelim Transformer supplies thousands of three-phase pad-mounted transformers to the North American market annually. These transformers are utilized across diverse sectors including battery energy storage systems (BESS), electric vehicles, industrial applications, renewable energy, public utilities, data centers, and cryptocurrency mining.
Learn more about Daelim Transformer Projects
Testing
Routine Tests: Ratio, no-load loss, load losses, and impedance tests ensure performance meets standards.
Type Tests: Include resistance, temperature rise, impulse strength, and short-circuit tests to verify transformer integrity.
Reading more about Transformer Test
Packaging
Wooden Box Packaging: Ensures safety during transportation with fumigated logs and steel corner reinforcements to prevent damage.
Wooden Pallet Packaging: Provides a cost-effective solution for sea transportation, ensuring transformers are securely fastened with straps and wrapped in protective film.
Installation and Maintenance
Installing a pad mounted transformer involves considerations for location, environmental protection (NEMA 3R compliance for outdoor use), and electrical safety protocols. Routine maintenance, including testing for insulation resistance and functionality of protective devices like fuses and switches, is essential to ensure operational reliability and longevity.
More details about Transformer Installation
Conclusion
In conclusion, 3 phase pad mounted transformers are integral components of modern underground power distribution systems, offering enhanced safety, reliability, and efficiency. Their diverse configurations cater to specific application needs, ensuring uninterrupted power supply in critical scenarios. With stringent adherence to international standards and continuous technological advancements, pad mounted transformers continue to play a pivotal role in advancing sustainable energy distribution worldwide.
For more information on selecting the right pad mounted transformer for your specific requirements, consult with a certified transformer manufacturer like Daelim Transformer, renowned for its quality and reliability in the North and South American markets.