Overview of Transformer Three Phase Pad Mounted
The Three Phase Pad Mounted Transformer Series made by ShineGrand Electric is an outdoor power distribution solution rated for use with systems rated as high as 35KV and 6300KVA. These transformers are built for reliable, low maintenance reliability by small substations and integrate both high-voltage and low-voltage equipment into one sealed enclosure to reduce the amount of errors when performing field assembly on site due to wiring problems with separate components being installed in individual housings. The overall compactness of these transformers will fit within small urban spaces, along with industrial parks, and landscaped residential areas, while their corrosion-resistant housing will provide robust service outside.
The design has been designed with practicality in mind. These transformers can be placed on their concrete pads and will be ready to have power connected to them. The doors and windows can be accessed easily so that routine maintenance can be performed quickly without having to disassemble the transformer extensively and thereby minimize downtime for customers. The use of these transformers will enable large reductions in distribution voltages from the utility to customers in an industrial, commercial or residential application, and will continue to provide service through durable construction methods while supplying required power to customers.
- A voltage range from 35KV, maximum capacity is 6300KVA – Suitable for most small substation applications
- HV and LV components pre-integrated into one cabinet provide easy, quick and error-free installation
- Corrosion-resistant enclosure provides durability against environmental effects such as rain, humidity, UV exposure and temperature extremes
- Maintenance-friendly design includes access doors and windows, as well as accessible fuses
Key Features & Benefits
Pre-Installed Integration
HV and LV components are internally installed together in a sealed cabinet. When a transformer has been set on its pad, it can almost immediately be connected to power, which greatly reduces the amount of labor and mistakes made in the field.
Compact Space-Saving Design
The single cabinet design has a smaller footprint than traditional designs, allowing for installation in tight locations such as urban areas, landscaped areas, or retrofits.
Superior Outdoor Protection
The A3 steel cabinet is coated with an anti-corrosion finish providing the necessary protection against rain, UV rays, humidity, and temperature changes; therefore, it delivers decades of dependable pad-mounted transformer operation.
Easy Access Maintenance
The use of hinged doors, inspection windows, and drain/sample valves allows maintenance personnel to easily check oil levels, fuses, and connections without having to completely disassemble the equipment, resulting in little or no disruption of service.
Flexible Ratings
The pad-mounted transformers are designed for primary voltages up to 35 kV and have capacity ratings of up to 6300 kVA, with tappings (±5% or ±2×2.5%) available to meet various distribution systems.
Quiet & Discreet Operation
The low magnetic noise produced by the pad-mounted transformers and their compact cabinet allow these transformers to blend seamlessly into either residential or commercial environments without causing visual or audible pollution.
Applications & Industries
Industrial Parks
Provide centralized power distribution to multiple facilities from a single outdoor substation, ideal for manufacturing and logistics hubs.
Residential Developments
Steps down voltage for housing communities while blending into the landscape with a low-profile, green-colored cabinet.
Commercial Complexes
Shopping centers, office parks, and retail spaces benefit from the compact size and quiet operation, reducing impact on customer areas.
Rural & Temporary Power
Quick deployment for rural electrification, construction sites, or emergency backup — simply place on a pad and connect.
Technical Specifications & Components
Typical three-phase pad-mounted transformer configuration (ratings as high as 35KV, 6300KVA). Detailed specifications and diagrams are available upon request.
| Item | Description | QTY |
|---|---|---|
| 1 | LIFTING LUG | 4 |
| 2 | FOUR POSITION LB SWITCH | 1 |
| 3 | BAYONET FUSE | 3 |
| 4 | DRIP TRAY | 1 |
| 5 | TAP CHANGER | 1 |
| 6 | FILL PLUG | 1 |
| 7 | OIL LEVEL GAUGE | 1 |
| 8 | PRESSURE RELIEF VALVE | 1 |
| 9 | VACUUM PRESSURE GAUGE | 1 |
| 10 | OIL TEMPERATURE INDICATOR | 1 |
| 11 | NAME PLATE | 1 |
| 12 | LV BUSHING | 4 |
| 13 | ELSP FUSE | 6 |
| 14 | TANK COVER | 1 |
| 15 | LOADBREAK BUSHING INSERT | 3 |
| 16 | HV BUSHING WELL | 3 |
| 17 | HINGED DOOR | 2 |
| 18 | DOOR HANDLE | 1 |
| 19 | GROUND STRAP COPPER | 1 |
| 20 | GROUND STEEL PAD | 1 |
| 21 | 1″ DRAIN VALVE WITH 3/8″ SAMPLER | 1 |
| 22 | PARKING STAND BRACKET | 5 |
Request detailed pad-mounted transformer diagrams, dimensional drawings, and technical datasheets for your project.
Why Choose Our Three Phase Pad Mounted Transformers
Faster Installation
Pre-integrated cabinet reduces wiring and assembly time by up to 50% compared to conventional setups, cutting labor costs.
Certified Durability
Enclosure passes salt spray, UV, and humidity tests; every unit undergoes routine load and insulation testing.
Competitive Price
Factory-direct supply keeps the 3 phase pad mounted transformer price low for bulk orders — request a quote for 500 kVA, 2500 kVA, or other ratings.
Fast Lead Times
Standard models ship in 3–5 weeks. Custom tapping and accessories are available with flexible delivery schedules.
Certifications & Standards
IEC 60076
ISO 9001
DOE 2016
NEMA TR1
How This Pad Mounted Transformer Fits Your Project
Guidance for EPCs, contractors, and distributors selecting a three-phase pad-mounted transformer for outdoor substations.
Project Applications
For Industrial Parks, the 2000–6300KVA range handles heavy machinery loads with minimal footprint. Residential Developments commonly use 500–1000KVA units to step down to 208Y/120V or 480Y/277V, blending into landscaping. Commercial Complexes prefer the quiet, low-profile cabinet that sits easily near buildings and parking areas without visual disruption.
Common Ratings & Selection
The 500 kVA 3 phase pad mounted transformer is a popular choice for mid-sized residential or commercial loads. For larger distribution, the 2500 kVA 3 phase pad mounted transformer suits industrial feeders. Our series scales from small 150 kVA up to 6300 kVA, and primary voltages up to 35KV — request a 3 phase pad mounted transformer diagram to verify terminal configurations.
Pad Mount vs. Pole Mount vs. Underground
This padmount transformer sits on a concrete pad at ground level, offering easier access for maintenance than pole-mounted units and simpler installation than underground vault types. It’s ideal when overhead lines are impractical but below-grade installation isn’t required.
Frequently Asked Questions
What is a pad-mounted transformer?
A pad-mounted transformer is a ground-level electrical distribution transformer housed in a locked metal cabinet, commonly used in residential neighborhoods, commercial areas, and industrial parks. It is installed on a concrete pad and steps down primary voltage for local usage.
What is the NEC code for pad-mounted transformers?
The National Electrical Code (NEC) primarily addresses transformers in Article 450. For pad-mounted units, additional clearances and accessibility requirements may apply under local utility standards. Typically, NEC 110.34 and 450.21 cover working space and guarding, but the exact requirements can vary — consult the latest edition and local amendments.
Are pad-mounted transformers still used?
Yes, pad-mounted transformers are widely used today for new residential, commercial, and light industrial distribution. Their ground-level design, security, and ease of maintenance make them the standard choice in many modern developments.
What is the 80% rule for transformers?
The 80% rule refers to continuous loading recommendations — a transformer should generally not exceed 80% of its nameplate rating for continuous loads to avoid overheating and extend service life. This is a common best practice rather than a strict regulation, derived from the NEC’s continuous load rules (Article 100 and 215.3).
How does a pad mounted transformer work?
A pad mounted transformer receives primary distribution voltage (e.g., 13.8 kV or 35 kV) through underground or overhead lines into its HV bushings. Inside, the voltage is stepped down by the core and coils to a lower utilization voltage (e.g., 480Y/277V or 208Y/120V), which exits through LV bushings to feed local loads.
Can I get custom specifications and diagrams?
Yes. We provide detailed 3 phase pad mounted transformer specifications, dimensional diagrams, and pricing for any rating up to 6300 KVA. Contact us with your project details for a tailored proposal.
→ Request a Quote or Datasheet for Your Pad Mounted Transformer
