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225kVA Three Phase Pad Mounted Transformer
225kVA Three Phase Pad Mounted Transformer
225kVA Three Phase Pad Mounted Transformer
225kVA Three Phase Pad Mounted Transformer

225kVA Three Phase Pad Mounted Transformer

The 225kVA three-phase pad transformer is an efficient and reliable power conversion device designed for commercial, industrial and distribution systems. With a high power capacity of 225kVA, the transformer is able to provide a stable three-phase power supply for large-scale equipment to meet high load requirements. Its rugged housing is made of weather-resistant materials and meets NEMA 3R standards, ensuring long-term stable operation in outdoor environments and preventing the influence of external factors such as water, dust and corrosion.

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Phone/WhatsApp: 8619131285373

Email: info@zishengtransformer.com
Factory Headquarters: No. 118, Jingyi Street, Economic Development Zone.

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The 225kVA Three Phase Pad Mounted Transformer is a compact, reliable, and energy-efficient outdoor distribution transformer designed for medium-voltage power distribution applications. It is widely used in utility networks, commercial buildings, industrial facilities, renewable energy projects, and infrastructure developments.

Installed on a concrete pad with a secure weather-resistant enclosure, the transformer provides safe and efficient voltage conversion from medium voltage (MV) to low voltage (LV). Compared with traditional pole-mounted transformers, the pad mounted design offers improved safety, easier maintenance, lower visual impact, and better protection in urban and industrial environments.

Manufactured with high-quality electrical materials and advanced production technology, the 225kVA three phase pad mounted transformer delivers stable performance, low power losses, excellent insulation performance, and long service life. The transformer can be customized according to different grid standards, environmental conditions, and EPC project requirements.


Advanced Design & Construction

The 225kVA Three Phase Pad Mounted Transformer adopts an oil-immersed design with ONAN (Oil Natural Air Natural) cooling. The transformer body is installed inside a robust steel enclosure that protects the internal components from moisture, dust, corrosion, and external impact.

The transformer core is manufactured using high-grade grain-oriented silicon steel, optimized to reduce magnetic losses and improve operating efficiency. The advanced core structure helps minimize no-load losses and operating noise.

The winding system uses high-conductivity copper or aluminum conductors with high-quality insulation materials. The optimized winding design provides excellent mechanical strength, thermal performance, and short-circuit resistance.

The sealed oil tank structure ensures reliable insulation performance and prevents oil leakage during long-term outdoor operation.


Key Features

1. Reliable Power Distribution

The 225kVA pad mounted transformer provides stable and continuous power supply for medium-voltage distribution systems.

Main advantages include:

  • Stable voltage output
  • High electrical efficiency
  • Strong overload capability
  • Excellent short-circuit withstand performance
  • Long operational lifespan

2. Safe Pad Mounted Structure

The enclosed cabinet design improves operational safety and reduces maintenance requirements.

Features include:

  • Outdoor weather-resistant enclosure
  • Secure locking system
  • High-voltage and low-voltage compartment separation
  • Safe cable connection design
  • Optional dead-front configuration

This makes it suitable for installation in public areas, commercial zones, and industrial sites.


3. Energy Efficient Operation

The transformer is designed with low-loss technology to reduce operating costs.

Energy-saving features include:

  • Low-loss silicon steel core
  • Optimized electromagnetic design
  • Reduced no-load losses
  • Reduced load losses
  • High-quality insulation materials

The design helps improve overall system efficiency and reduce long-term electricity consumption.


4. Flexible Voltage Configuration

The transformer can be customized according to different electrical systems.

Typical voltage configurations include:

  • 11kV / 0.4kV
  • 13.8kV / 0.48kV
  • 15kV / 0.415kV
  • 20kV / 0.4kV
  • 35kV / 0.4kV

Other voltage ratings are available based on customer requirements.


5. Durable Outdoor Enclosure

The transformer cabinet is manufactured from high-strength steel with corrosion-resistant treatment.

Suitable for:

  • Outdoor installation
  • High humidity environments
  • Coastal areas
  • Industrial environments
  • Extreme weather conditions

Optional coating systems are available for different climate conditions.


Main Components

Transformer Core

  • Grain-oriented silicon steel
  • Low-loss magnetic design
  • High mechanical strength structure

Windings

  • Copper or aluminum conductor options
  • High-temperature insulation
  • Optimized winding arrangement

Insulation System

  • Mineral insulating oil
  • Optional environmentally friendly insulating fluid
  • Reliable dielectric performance

Protection Components

Optional accessories include:

  • High-voltage fuse
  • Load break switch
  • Surge arrester
  • Low-voltage circuit breaker
  • Pressure relief device
  • Oil level indicator
  • Temperature indicator
  • Remote monitoring system

Technical Advantages

High Reliability

Designed for continuous operation in utility and industrial distribution networks.

Easy Installation

Compact pad mounted structure simplifies installation and reduces project construction time.

Low Maintenance

Robust enclosure and reliable internal components reduce maintenance requirements.

Project Flexibility

Suitable for customized EPC solutions with different voltage levels, accessories, and standards.


Applications

Renewable Energy Projects

The 225kVA pad mounted transformer is commonly used in:

  • Solar PV plants
  • Wind farms
  • Battery Energy Storage Systems (BESS)
  • Distributed energy systems

It provides reliable power conversion between renewable energy sources and medium-voltage grids.


Utility Distribution Networks

Suitable for:

  • Underground distribution systems
  • Residential communities
  • Urban power networks
  • Utility infrastructure projects

Commercial Facilities

Applications include:

  • Shopping malls
  • Office buildings
  • Hotels
  • Schools
  • Hospitals
  • Business centers

Industrial Projects

Used in:

  • Manufacturing plants
  • Mining operations
  • Oil & gas facilities
  • Chemical plants
  • Industrial parks

Providing stable power for production equipment and auxiliary systems.


Infrastructure Applications

Suitable for:

  • Water treatment plants
  • Transportation facilities
  • Municipal projects
  • Public buildings

Manufacturing & Quality Control

The 225kVA Three Phase Pad Mounted Transformer is manufactured through strict quality control procedures.

Production process includes:

  1. Engineering design review
  2. Core cutting and assembly
  3. Coil winding production
  4. Transformer assembly
  5. Tank manufacturing
  6. Vacuum oil filling
  7. Electrical testing
  8. Final inspection and shipment preparation

Factory Testing

Each transformer undergoes complete routine testing before delivery:

  • Winding resistance test
  • Voltage ratio test
  • Phase displacement test
  • No-load loss test
  • Load loss test
  • Impedance voltage test
  • Insulation resistance test
  • Applied voltage test
  • Induced voltage test
  • Oil leakage test
  • Appearance inspection

Factory Acceptance Test (FAT) and additional type tests are available for EPC and utility projects.


Why Choose Our 225kVA Pad Mounted Transformer?

✔ Direct manufacturer supply
✔ IEC / ANSI / IEEE compliant production
✔ Customized electrical design
✔ Complete factory testing before shipment
✔ Suitable for EPC and utility projects
✔ Reliable outdoor operation
✔ Professional export service and technical support


The 225kVA Three Phase Pad Mounted Transformer provides a safe, efficient, and flexible power distribution solution for modern electrical networks, renewable energy projects, industrial facilities, and commercial applications worldwide.

Item Specification
Product Type Three Phase Pad Mounted Transformer
Rated Capacity 225 kVA
Phase Three Phase
Frequency 50Hz / 60Hz
Primary Voltage 6.6kV / 10kV / 11kV / 13.8kV / 15kV / 20kV / 22kV / 33kV / Customized
Secondary Voltage 380V / 400V / 415V / 480V / Customized
Cooling Method ONAN (Oil Natural Air Natural)
Transformer Type Oil-Immersed Pad Mounted Transformer
Installation Outdoor Pad Mounted
Winding Material Copper / Aluminum
Core Material Grain-Oriented Silicon Steel
Insulation Medium Mineral Transformer Oil / Eco-Friendly Insulating Fluid
Vector Group Dyn11 / Yyn0 / Customized
Tap Changer Off-Circuit Tap Changer (NLTC)
Tap Range ±2×2.5% / ±5% / Customized
Impedance Voltage Typically 4%–6% (Customized)
No-Load Loss According to IEC / ANSI / IEEE requirements
Load Loss According to IEC / ANSI / IEEE requirements
Insulation Level According to Rated Voltage Class
Temperature Rise According to Applicable Standards
High Voltage Connection Cable Connection / Bushing Connection
Low Voltage Connection Cable Connection / Busbar Connection
High Voltage Protection Load Break Switch / Fuse / Customized
Surge Protection Surge Arrester (Optional)
Enclosure Material Powder-Coated Steel Cabinet
Enclosure Protection Outdoor Weatherproof Design
Protection Level IP54 / IP55 / Customized
Ambient Temperature -25°C to +40°C (Standard)
Altitude ≤1000m (Higher Altitude Available)
Noise Level According to IEC / Customer Requirements
Applicable Standards IEC 60076 / ANSI C57 / IEEE
Service Life 25–30 Years Under Normal Operating Conditions

Standard Accessories

The 225kVA Three Phase Pad Mounted Transformer can be equipped with:

  • High voltage load break switch
  • High voltage fuse
  • Surge arrester
  • Low voltage circuit breaker
  • Oil level indicator
  • Pressure relief device
  • Temperature indicator
  • Grounding terminals
  • Drain valve
  • Lifting lugs
  • Nameplate and warning labels

Custom Technical Options

For utility and EPC projects, the transformer can be customized with:

  • Special primary and secondary voltage ratings
  • Copper or aluminum winding design
  • Different impedance requirements
  • Customized vector group
  • OLTC / NLTC tap changer
  • Special enclosure design
  • Coastal corrosion protection
  • High-temperature operation design
  • Smart monitoring and communication system
  • IEC / ANSI / IEEE compliance documentation

Final technical parameters can be customized according to local grid requirements, project specifications, and customer standards.

The 225kVA Three Phase Pad Mounted Transformer can be customized according to different power distribution requirements, environmental conditions, and EPC project specifications.

Electrical Configuration

  • Primary and secondary voltage customization
  • 50Hz / 60Hz frequency selection
  • Copper or aluminum winding options
  • Customized impedance values
  • Vector group selection (Dyn11, Yyn0, or other requirements)
  • No-load tap changer (NLTC) adjustment
  • Customized insulation level and temperature rise requirements

Protection & Accessories

Optional protection devices and accessories include:

  • High-voltage load break switch
  • High-voltage fuse
  • Surge arrester
  • Low-voltage circuit breaker
  • Pressure relief device
  • Oil level indicator
  • Oil temperature indicator
  • Winding temperature monitor
  • Remote monitoring system
  • Smart transformer monitoring solutions

Enclosure & Mechanical Design

The transformer enclosure can be customized for different installation environments:

  • Dead-front or live-front design
  • Customized cabinet dimensions
  • Outdoor weather-resistant enclosure
  • Corrosion-resistant coating system
  • Coastal and high-humidity protection
  • Special cable entry and connection arrangement
  • Customized color and surface treatment

Insulation & Cooling Options

Available options include:

  • Mineral transformer oil
  • Environmentally friendly insulating fluid
  • Enhanced insulation system
  • Special cooling design for high-temperature environments

Standards & Project Documentation

For international and EPC projects, we provide:

  • IEC / ANSI / IEEE standard design
  • Project-specific technical specifications
  • Transformer drawings
  • Datasheets
  • Factory Acceptance Test (FAT)
  • Routine test reports
  • Quality certificates
  • Installation and operation manuals

Customized 225kVA pad mounted transformer solutions are available for utility distribution, renewable energy, industrial, commercial, and infrastructure projects.

The 225kVA Three Phase Pad Mounted Transformer is carefully inspected, protected, and packed before shipment to ensure safe delivery and reliable installation at the project site.

Export Standard Packaging

Before transportation, each transformer undergoes final inspection and preparation, including:

  • Complete appearance and quality inspection
  • Protection of bushings, terminals, and accessories
  • Moisture-proof and dust-proof treatment
  • Secure fixing to prevent movement during transportation
  • Export-standard packing suitable for international shipment

Transportation Preparation

The transformer is prepared according to different transportation methods:

  • Sea freight
  • Road transportation
  • Rail transportation

Professional packing methods help protect the transformer from vibration, impact, humidity, and environmental conditions during long-distance transportation.

Technical Documentation

Each shipment can include complete project documents:

  • Product specification sheet
  • Transformer nameplate information
  • Routine test reports
  • Factory Acceptance Test (FAT) documents (if required)
  • Quality certificates
  • Installation and operation manual
  • Packing list

Global Delivery Support

We provide complete export support for overseas customers and EPC projects, including:

  • Container loading arrangement
  • Shipping coordination
  • Export documentation support
  • Delivery tracking assistance

Every 225kVA Three Phase Pad Mounted Transformer is delivered with careful handling and professional packaging to ensure safe arrival and smooth installation at the customer’s project site.

Each 225kVA Three Phase Pad Mounted Transformer is manufactured under strict quality control and undergoes comprehensive testing before shipment to ensure reliable performance, safety, and compliance with international standards.

Our factory performs complete inspections and electrical tests according to IEC 60076, ANSI C57, IEEE standards, and customer-specific project requirements.

Factory Testing Procedures

1. Winding Resistance Test

The resistance of each transformer winding is measured to verify:

  • Winding manufacturing quality
  • Electrical connection reliability
  • Conductor consistency
  • Proper assembly performance

2. Voltage Ratio Test

The transformer ratio is tested at different tap positions to confirm:

  • Correct voltage transformation
  • Tap changer accuracy
  • Phase relationship
  • Compliance with design specifications

3. No-Load Loss & Excitation Current Test

This test evaluates the transformer core performance by measuring:

  • Core loss
  • No-load current
  • Magnetic performance
  • Energy efficiency characteristics

4. Load Loss & Impedance Voltage Test

The transformer is tested under load conditions to verify:

  • Load loss values
  • Impedance voltage
  • Electrical performance
  • Design accuracy

5. Insulation Resistance Test

The insulation system is checked between:

  • High voltage winding and low voltage winding
  • Windings and ground
  • Internal components and enclosure

This ensures safe operation and long-term insulation reliability.


6. Dielectric Strength Test

The transformer insulation system is tested through:

  • Applied voltage test
  • Induced voltage test

These tests verify the transformer’s ability to withstand electrical stress during operation.


7. Oil Quality & Leakage Test

The transformer tank and sealing system are inspected to ensure:

  • No oil leakage
  • Proper tank sealing
  • Reliable insulation performance
  • Long-term outdoor operation capability

8. Mechanical & Appearance Inspection

Final inspection includes:

  • Enclosure structure
  • Painting quality
  • Nameplate information
  • Terminal arrangement
  • Protection devices
  • Accessories installation
  • Overall workmanship

Factory Acceptance Test (FAT)

For EPC contractors, utilities, and large-scale projects, a Factory Acceptance Test (FAT) can be arranged before shipment.

FAT may include:

  • Customer witness inspection
  • Performance verification
  • Test report review
  • Technical document confirmation

Available documentation:

  • Routine test reports
  • Quality certificates
  • Technical drawings
  • Material certificates
  • Inspection records

Through strict manufacturing control and testing procedures, every 225kVA Three Phase Pad Mounted Transformer is delivered with verified quality, stable electrical performance, and reliable operation for long-term power distribution applications.

Every 225kVA Three Phase Pad Mounted Transformer undergoes complete routine testing before delivery to ensure electrical performance, safety, and reliable operation throughout its service life.

Routine tests are performed according to IEC 60076, ANSI C57, IEEE standards, and customer project requirements.

Standard Routine Tests Include:

1. Winding Resistance Measurement

Measures the resistance of transformer windings to verify:

  • Winding conductor quality
  • Internal connection reliability
  • Manufacturing consistency
  • Correct assembly process

2. Voltage Ratio Test

Checks the transformer transformation ratio and verifies:

  • High-voltage and low-voltage ratio accuracy
  • Tap position performance
  • Phase displacement
  • Compliance with design requirements

3. No-Load Loss & Excitation Current Test

Measures transformer performance under no-load conditions, including:

  • Core loss
  • Excitation current
  • Magnetic circuit performance
  • Energy efficiency characteristics

4. Load Loss & Impedance Voltage Test

Evaluates transformer performance under rated load conditions:

  • Load loss measurement
  • Impedance voltage verification
  • Operating efficiency confirmation
  • Electrical parameter inspection

5. Insulation Resistance Test

Tests the insulation condition between:

  • High-voltage winding and low-voltage winding
  • Windings and ground
  • Electrical components and enclosure

Ensures safe operation and insulation reliability.


6. Applied Voltage Test

Verifies the strength of the transformer insulation system under specified voltage conditions to ensure reliable electrical protection.


7. Induced Voltage Test

Checks internal insulation performance and confirms the transformer can withstand voltage stress during normal and abnormal operation.


8. Oil Leakage Inspection

The transformer tank and sealing system are inspected to ensure:

  • No oil leakage
  • Proper sealing performance
  • Reliable outdoor operation

9. Final Appearance & Assembly Inspection

Before shipment, each transformer is inspected for:

  • Cabinet structure
  • Painting quality
  • Nameplate details
  • Terminal connections
  • Accessories installation
  • Overall manufacturing quality

Testing Documentation

Each transformer can be supplied with complete testing records, including:

  • Routine test reports
  • Electrical performance data
  • Quality certificates
  • Inspection records

Additional inspection and testing services are available for EPC projects, utility applications, and customer-specific requirements.

Strict routine testing ensures every 225kVA Three Phase Pad Mounted Transformer meets technical specifications and provides safe, stable, and reliable power distribution performance.

The 225kVA Three Phase Pad Mounted Transformer is designed for reliable medium-voltage to low-voltage power distribution in a wide range of applications. With a compact structure, safe enclosed design, and flexible configuration options, it is widely used in utility networks, renewable energy projects, commercial facilities, and industrial power systems.


Renewable Energy Projects

The 225kVA pad mounted transformer is widely applied in clean energy projects to connect distributed power generation systems with medium-voltage grids.

Typical applications include:

  • Solar PV power plants
  • Wind farms
  • Battery Energy Storage Systems (BESS)
  • Distributed energy generation projects

It provides stable voltage conversion and reliable power transmission between renewable energy sources and electrical distribution networks.


Utility Distribution Networks

The transformer is suitable for modern underground and outdoor distribution systems used by power utilities.

Applications include:

  • Residential communities
  • Urban underground cable networks
  • Utility substations
  • Public power distribution systems
  • Rural electrification projects

The enclosed cabinet design improves safety, reduces maintenance requirements, and supports reliable long-term operation.


Commercial Buildings

The 225kVA pad mounted transformer provides dependable power supply for commercial and public facilities requiring stable electricity.

Common applications include:

  • Office buildings
  • Shopping centers
  • Hotels
  • Schools
  • Hospitals
  • Business parks

It supports lighting systems, HVAC equipment, elevators, and other commercial electrical loads.


Industrial Facilities

Designed for demanding industrial environments, the transformer provides reliable power distribution for various production applications.

Suitable for:

  • Manufacturing plants
  • Industrial parks
  • Mining operations
  • Oil & gas facilities
  • Chemical plants
  • Processing factories

It supplies stable power for industrial equipment, motors, automation systems, and production lines.


Infrastructure Projects

The compact outdoor design makes the transformer suitable for various infrastructure developments.

Applications include:

  • Water treatment plants
  • Transportation facilities
  • Municipal projects
  • Public facilities
  • Construction projects

Data Centers & Critical Power Applications

For facilities requiring high power reliability, the transformer can be integrated into medium-voltage distribution systems for:

  • Data centers
  • Communication facilities
  • Critical infrastructure
  • Backup power systems

Optional monitoring and protection solutions help improve system reliability and operational safety.


The 225kVA Three Phase Pad Mounted Transformer provides a safe, efficient, and customizable power distribution solution for utilities, EPC contractors, renewable energy developers, commercial facilities, and industrial projects worldwide.

1. What is a 225kVA Three Phase Pad Mounted Transformer?

A 225kVA Three Phase Pad Mounted Transformer is an outdoor distribution transformer designed to convert medium-voltage electricity into low-voltage power for end users. It is installed on a concrete pad and protected by a weather-resistant metal enclosure, making it suitable for utility, commercial, industrial, and renewable energy applications.


2. What voltage ratings are available for the 225kVA pad mounted transformer?

The primary and secondary voltage can be customized according to local grid requirements and project specifications.

Common configurations include:

  • 11kV / 0.4kV
  • 13.8kV / 0.48kV
  • 15kV / 0.415kV
  • 20kV / 0.4kV
  • 35kV / 0.4kV

Other voltage combinations are available upon request.


3. Can the 225kVA transformer be customized?

Yes. We provide customized transformer solutions based on customer requirements, including:

  • Voltage ratings
  • Frequency (50Hz / 60Hz)
  • Copper or aluminum windings
  • Vector group
  • Impedance
  • Tap range
  • Protection devices
  • Enclosure design
  • Accessories and monitoring systems

4. Is this transformer suitable for outdoor installation?

Yes. The 225kVA pad mounted transformer is designed for outdoor operation with a strong steel enclosure that protects internal components from:

  • Rain
  • Dust
  • Humidity
  • Temperature changes
  • Outdoor environmental conditions

Special protection designs are available for coastal and harsh environments.


5. What cooling method is used for the transformer?

The standard cooling method is ONAN (Oil Natural Air Natural), which uses natural circulation of insulating oil and air for heat dissipation.

Other cooling solutions can be customized according to project requirements.


6. What winding materials are available?

The transformer can be manufactured with:

  • Copper windings for higher conductivity and improved electrical performance
  • Aluminum windings for cost-effective distribution applications

The best option can be selected according to project requirements.


7. What protection accessories can be installed?

Optional protection and monitoring devices include:

  • Load break switch
  • High-voltage fuse
  • Surge arrester
  • Low-voltage circuit breaker
  • Pressure relief device
  • Oil level indicator
  • Temperature indicator
  • Remote monitoring system

8. What standards does the transformer comply with?

The transformer can be designed and manufactured according to:

  • IEC 60076
  • ANSI C57
  • IEEE standards

Customized standards are also available based on customer requirements.


9. What tests are performed before shipment?

Each transformer undergoes complete factory testing, including:

  • Winding resistance test
  • Voltage ratio test
  • No-load loss test
  • Load loss test
  • Impedance voltage test
  • Insulation resistance test
  • Applied voltage test
  • Induced voltage test
  • Oil leakage inspection
  • Appearance inspection

Test reports are provided for quality verification.


10. Can you provide Factory Acceptance Test (FAT)?

Yes. FAT can be arranged for EPC contractors, utilities, and large projects.

FAT services include:

  • Customer witness testing
  • Test report review
  • Quality inspection
  • Technical document confirmation

11. What information is needed for a quotation?

To provide an accurate quotation, please provide:

  • Rated capacity: 225kVA
  • Primary voltage
  • Secondary voltage
  • Frequency
  • Installation location
  • Required standards
  • Protection requirements
  • Quantity
  • Delivery destination

Our engineering team will recommend the most suitable transformer configuration based on your project requirements.


The 225kVA Three Phase Pad Mounted Transformer is a reliable solution for modern power distribution systems, providing safe operation, high efficiency, and flexible customization for global projects.

225kVA Three Phase Pad Mounted Transformer225kVA Three Phase Pad Mounted Transformer

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