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50KVA Three Phase Pad Mounted Transformer 12470Y/7200 to 240/120V Secondary Copper Coils
This high-efficiency three phase pad mounted transformer features a silicon steel core and pure copper windings for minimal loss and durability. Compact, easy to maintain, and with anti-theft/anti-corrosion features, it suits energy storage, utility grids, and residential areas, meeting global quality standards.
Product Overview
The 50KVA Three Phase Pad Mounted Transformer is a high-performance, copper-coil power distribution solution engineered for 12470Y/7200V three-phase primary input and 240/120V secondary output—specialized for balanced, high-capacity power delivery to commercial, industrial, and large residential applications. Unlike single-phase models, this three-phase unit delivers consistent, low-loss voltage transformation with superior load balancing, while its premium copper windings enhance conductivity, heat resistance, and long-term reliability.
Fully compliant with ANSI, IEEE, NEMA, and DOE 2016 efficiency standards, it features non-PCB mineral oil insulation and an ONAN (Oil Natural, Air Natural) cooling system, ensuring efficient heat dissipation without external fans or pumps. Enclosed in a heavy-duty, weatherproof NEMA 3R cabinet with a corrosion-resistant epoxy coating, it is designed for direct outdoor concrete pad installation, protecting internal components from moisture, extreme temperatures (-40℃ to +55℃), and unauthorized access.
Key Features & Benefits
Three-Phase Copper Coil Construction: Equipped with high-conductivity three-phase copper windings, delivering 15-20% lower energy loss than aluminum-coil alternatives. Copper's superior heat resistance and corrosion resistance minimize wear, ensure balanced load distribution, and maintain stable performance even during peak three-phase loads.
12470Y/7200V Grounded Wye Three-Phase Primary: Standardized 4-wire multi-grounded neutral configuration for North American medium-voltage grids, optimized for three-phase power delivery. Provides enhanced fault protection, voltage balance, and compatibility with loop/radial feed utility setups.
Efficient Insulation & Three-Phase Cooling: Non-PCB mineral oil (ASTM D3487 compliant) delivers exceptional dielectric strength to prevent arcing, while the ONAN natural cooling system is calibrated for three-phase heat dissipation. Eliminates moving parts, reduces failure points, and lowers long-term operational costs.
Heavy-Duty Weatherproof Design: NEMA 3R cabinet (mild steel with epoxy coating) is fully sealed to resist moisture, dust, and harsh outdoor conditions. Features reinforced lifting lugs for easy installation, pad-lockable doors for security, and a compact footprint.
Industry Compliance & Versatile Output: Meets ANSI/IEEE C57.12.00, NEMA TP-1, and DOE 2016 efficiency standards, with UL/CSA certification for North American markets. The 240/120V split-phase secondary supports both 120V household/commercial loads and 240V heavy-duty equipment.
Product parameters and images are for general reference only and may not reflect all details of your custom configuration, due to custom builds and minor variations between standard models. Precise specifications for your order are detailed in the specification table and supporting technical documents (CAD files, dimensional drawings, wiring diagrams, etc.). Specific details may differ from images. Please review all specifications and technical documents before ordering; do not rely solely on product images. We offer custom-built units with lead times nearly as fast as prebuilt models—contact us for your specific requirements.
Applications
Large Commercial Complexes: Powers shopping malls, office parks, hotels, and grocery stores, delivering balanced three-phase power for HVAC systems, commercial refrigeration, elevators, and multiple retail/office units with minimal energy loss.
Industrial Facilities: Supports small to medium manufacturing plants, warehouses, and production facilities, providing stable three-phase power for machinery, compressors, conveyor systems, and industrial equipment that requires balanced voltage.
Multi-Family Residential Developments: Supplies power to large apartment complexes, townhouse communities, and mixed-use residential/commercial buildings, delivering reliable three-phase power for shared amenities and multiple households.
Utility Grid Upgrades & Expansion: Ideal for replacing aging aluminum-coil or single-phase transformers in North American medium-voltage grids, improving efficiency, load capacity, and compliance with modern energy standards for three-phase distribution.
Public & Municipal Infrastructure: Powers schools, hospitals, sports complexes, and municipal buildings, ensuring critical three-phase operations (e.g., medical equipment, HVAC, emergency systems) run smoothly with low maintenance needs.
Frequently Asked Questions
How does three-phase design benefit this 50KVA transformer compared to single-phase models?
Three-phase design delivers balanced power distribution, reducing voltage drop and energy loss—critical for 50KVA loads. It handles higher power demands more efficiently than single-phase units, supports industrial/commercial equipment that requires three-phase power (e.g., motors, compressors), and minimizes wear on internal components by distributing load evenly across three windings, extending service life.
Is the 12470Y/7200V three-phase primary compatible with existing North American utility grids?
Yes. The 12470Y/7200V grounded wye three-phase primary is a standard configuration in North American medium-voltage grids. It is fully compatible with both loop feed and radial feed setups, allowing seamless integration into existing three-phase distribution networks or new installations without extensive modifications.
What is the efficiency rating of this three-phase copper-coil transformer, and how does it compare to aluminum-coil three-phase units?
This transformer has a DOE 2016-compliant efficiency rating of 99.2% at full load and 99.0% at 50% load. Compared to aluminum-coil 50KVA three-phase transformers (typically 97.9-98.3% full-load efficiency), it reduces energy loss by 15-20%, translating to significant long-term cost savings for commercial/industrial users and utility companies.
Can this three-phase transformer handle unbalanced loads, and how does the copper coil design support this?
Yes. It is engineered to handle unbalanced secondary loads (common in mixed commercial/residential applications) without voltage distortion. The three-phase copper coils' superior conductivity and heat resistance ensure stable performance even when loads are uneven, preventing overheating and maintaining efficiency—unlike aluminum coils, which are more prone to wear under unbalanced conditions.
What installation considerations are unique to this three-phase pad-mounted transformer?
While it installs on a standard concrete pad (typically 5'x7' to support its weight), three-phase installation requires proper phase alignment with the utility grid to ensure balanced power delivery. It also requires three-phase input wiring (vs. single-phase), but the unit's terminals are color-coded for easy identification, simplifying installation. No additional maintenance is needed compared to single-phase units—only routine oil checks and visual inspections.
