1. Product Overview

ZISHENG 750kVA Three-Phase Oil-Immersed Outdoor Substation Transformer is a high-performance distribution transformer designed for medium-capacity power distribution systems, outdoor substations, industrial facilities, renewable energy projects, and utility networks.

With a rated capacity of 750kVA, this transformer provides stable and efficient voltage conversion for applications requiring reliable power supply, high load capacity, and long-term continuous operation.

The transformer adopts high-quality transformer oil as the insulation and cooling medium. The oil-immersed design provides excellent heat dissipation, superior insulation performance, strong overload capability, and reliable operation in various outdoor environments.

Manufactured using advanced production technology, high-quality electrical materials, and strict quality control processes, ZISHENG 750kVA Oil-Immersed Transformer features:

• High energy efficiency
• Low operating losses
• Excellent thermal performance
• Strong short-circuit withstand capability
• Stable operation under harsh environmental conditions
• Long service life

It is widely used in:

• Outdoor substations
• Industrial power distribution systems
• Solar photovoltaic projects
• Energy storage systems
• Mining and infrastructure projects
• Commercial power networks

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2. Product Specifications

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3. Main Structure Design

3.1 High-Efficiency Magnetic Core

The 750kVA transformer uses premium grain-oriented silicon steel sheets with optimized magnetic circuit design.

Features:

• Low no-load loss
• Reduced excitation current
• Improved energy efficiency
• Lower operating temperature
• Reduced noise level
• Enhanced transformer stability

The optimized core design minimizes energy consumption and improves the overall operating efficiency of the transformer.

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3.2 High-Performance Three-Phase Winding System

The transformer uses high-quality copper or aluminum windings designed for medium-capacity power distribution applications.

Advantages:

• Excellent electrical conductivity
• High mechanical strength
• Strong thermal stability
• Reliable insulation performance
• Superior short-circuit resistance

The reinforced winding structure improves reliability during power system fluctuations and short-circuit conditions.

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3.3 Advanced Transformer Oil Cooling System

The transformer uses high-quality insulating oil for both cooling and insulation.

Main Functions:

• Transfers heat from windings and core
• Maintains stable operating temperature
• Improves insulation performance
• Enhances overload capability
• Extends transformer service life

The ONAN cooling system provides efficient natural oil circulation and air cooling without additional cooling equipment.

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3.4 Durable Outdoor Transformer Tank

The transformer tank is designed for outdoor installation and manufactured using high-strength steel materials.

Features:

• Strong mechanical structure
• Reliable oil sealing
• Weather resistance
• Moisture protection
• Dust resistance
• Long-term outdoor durability

The robust structure allows stable operation in:

• Tropical climates
• High-temperature regions
• High-humidity environments
• Industrial areas
• Remote locations

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4. Product Advantages

Reliable Substation Power Supply

The 750kVA Oil-Immersed Transformer is designed for continuous operation in power distribution networks.

It provides:

• Stable voltage transformation
• Reliable electricity supply
• High operational safety
• Long-term service performance

Suitable for utility and private substations.

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High Energy Efficiency

The transformer adopts low-loss materials and advanced electromagnetic design.

Benefits:

• Reduced energy consumption
• Lower operating costs
• Improved power efficiency
• Reduced carbon emissions

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Excellent Heat Dissipation Capability

The oil cooling system efficiently removes heat generated by:

• Iron core
• Windings
• Internal components

Advantages:

• Stable temperature control
• Improved insulation life
• Better overload performance

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Strong Overload Capability

The transformer is designed to withstand temporary overload conditions.

Suitable for applications with:

• Industrial load variation
• Peak electricity demand
• Renewable energy fluctuations

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Superior Short-Circuit Resistance

The optimized mechanical structure improves resistance against short-circuit forces.

Benefits:

• Enhanced safety
• Reduced failure risk
• Improved reliability

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5. Application Areas

Outdoor Substations

• Utility substations
• Distribution substations
• Medium voltage networks
• Power grid expansion projects

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Industrial Applications

• Manufacturing plants
• Mining operations
• Oil and gas facilities
• Industrial parks
• Large production facilities

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Renewable Energy Projects

• Solar PV plants
• Wind power projects
• Battery energy storage systems
• Renewable energy substations

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Commercial Infrastructure

• Shopping centers
• Commercial complexes
• Residential communities
• Public facilities

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Remote Power Supply Projects

• Rural electrification
• Agricultural power systems
• Remote industrial sites

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6. Technical Features

Outdoor Installation Design

The transformer is suitable for outdoor installation due to:

• Weather-resistant structure
• Strong sealing performance
• Environmental adaptability
• Durable steel tank design

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Low Maintenance Requirement

Routine maintenance includes:

• Transformer oil inspection
• Oil leakage checking
• Bushing inspection
• Electrical connection checking
• Insulation testing
• Grounding inspection

Regular maintenance helps extend service life and improve operating reliability.

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Flexible Configuration Options

ZISHENG provides customized solutions according to customer requirements.

Available options:

• Voltage ratio customization
• 50Hz / 60Hz frequency selection
• Copper or aluminum winding
• Vector group selection
• Impedance adjustment
• Tap changer configuration
• Special environmental protection design
• Installation structure customization

Optional accessories:

• Oil temperature indicator
• Oil level indicator
• Pressure relief device
• Lightning arrester
• Conservator tank
• Buchholz relay
• Protective enclosure

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7. Manufacturing Process and Quality Control

ZISHENG applies strict quality control throughout the entire production process.

Raw Material Inspection

Including:

• Silicon steel sheet inspection
• Copper/aluminum conductor inspection
• Insulation material inspection
• Transformer oil quality testing

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Production Process Control

Including:

• Core cutting and assembly
• Coil winding
• Insulation treatment
• Transformer assembly
• Tank welding
• Vacuum oil filling

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Final Factory Testing

Each 750kVA Oil-Immersed Transformer undergoes professional testing:

• Winding resistance test
• Insulation resistance test
• Voltage ratio test
• No-load loss test
• Load loss test
• Dielectric strength test
• Oil leakage test
• Temperature rise test
• Performance verification

Only qualified transformers are approved for delivery.

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8. Why Choose ZISHENG 750kVA Oil-Immersed Outdoor Substation Transformer

• Professional transformer manufacturer
• Multiple production lines
• Advanced manufacturing technology
• High-quality electrical materials
• Strict quality inspection system
• Competitive factory-direct pricing
• Customized engineering solutions
• Stable production capacity
• Reliable delivery capability
• Export experience in Africa, South America, Southeast Asia, Central Asia, and Middle East markets

ZISHENG 750kVA 3-Phase Oil-Immersed Outdoor Substation Transformer provides a reliable, efficient, and durable power distribution solution for utility companies, EPC contractors, renewable energy developers, industrial enterprises, and electrical equipment distributors worldwide.

750kVA 3-Phase Oil-Immersed Outdoor Substation Transformer Product Q&A

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Q1: What is a 750kVA Three-Phase Oil-Immersed Outdoor Substation Transformer?

A: A 750kVA Three-Phase Oil-Immersed Outdoor Substation Transformer is a medium-capacity power transformer designed for outdoor substations and power distribution networks.

With a rated capacity of 750kVA, it converts electrical energy between different voltage levels and provides stable power supply for industrial, commercial, renewable energy, and utility applications.

The transformer uses transformer oil as the insulation and cooling medium, providing excellent heat dissipation, reliable insulation performance, and long-term operational stability.

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Q2: What are the main advantages of a 750kVA Oil-Immersed Transformer?

A: The main advantages include:

• High reliability for continuous power distribution
• Excellent oil cooling performance
• Low energy loss and high efficiency
• Strong overload capability
• Superior short-circuit resistance
• Durable outdoor structure
• Stable operation in harsh environments
• Long service life
• Flexible customization options
• Suitable for substation applications

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Q3: Where is a 750kVA Oil-Immersed Transformer commonly used?

A: The 750kVA transformer is widely used in:

• Outdoor substations
• Industrial power distribution systems
• Solar photovoltaic power plants
• Wind energy projects
• Battery energy storage systems
• Mining power supply systems
• Commercial facilities
• Infrastructure projects
• Utility distribution networks

It is suitable for applications requiring stable medium-capacity power supply.

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Q4: What voltage ratings are available for the 750kVA transformer?

A: ZISHENG provides customized voltage configurations according to different countries and project requirements.

Common high-voltage ratings include:

• 6kV
• 10kV
• 11kV
• 13.8kV
• 15kV
• 20kV
• 35kV

Common low-voltage ratings include:

• 220V
• 380V
• 400V
• 415V
• 480V
• 690V

The voltage ratio can be customized according to local grid standards.

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Q5: What is the difference between a 750kVA Oil-Immersed Transformer and a Dry Type Transformer?

A: The main differences are:

The oil-immersed design is preferred for outdoor applications requiring high reliability and continuous operation.

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Q6: Can the 750kVA transformer use copper winding?

A: Yes. ZISHENG provides copper winding and aluminum winding options.

Copper winding advantages:

• Higher electrical conductivity
• Lower power loss
• Better heat resistance
• Strong mechanical strength
• Improved short-circuit withstand capability
• Longer service life

Customers can choose the winding material according to project requirements and operating conditions.

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Q7: How does transformer oil improve the performance of the 750kVA transformer?

A: Transformer oil provides two essential functions:

Cooling Function:

• Removes heat generated by the core and windings
• Maintains safe operating temperature
• Improves overload capability

Insulation Function:

• Provides electrical insulation between internal components
• Enhances operational safety
• Extends insulation system lifespan

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Q8: Can the 750kVA Oil-Immersed Transformer be installed outdoors?

A: Yes. It is specifically designed for outdoor substation applications.

The transformer structure provides:

• Weather resistance
• Moisture protection
• Dust protection
• Strong mechanical strength
• Reliable oil sealing

It can operate in:

• Tropical regions
• High-temperature areas
• High-humidity environments
• Industrial locations
• Remote areas

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Q9: What cooling method is used in the 750kVA transformer?

A: The standard cooling method is ONAN (Oil Natural Air Natural).

The transformer oil naturally circulates inside the tank and transfers heat to the external air through radiators.

Advantages:

• Simple structure
• Reliable operation
• Low maintenance requirement
• Efficient heat dissipation

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Q10: What protection accessories are available for the 750kVA transformer?

A: ZISHENG can provide optional protection accessories, including:

• Oil temperature indicator
• Oil level indicator
• Pressure relief device
• Lightning arrester
• Conservator tank
• Buchholz relay
• Protective enclosure

These accessories improve transformer monitoring, safety, and operational reliability.

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Q11: Can the 750kVA transformer be customized?

A: Yes. ZISHENG provides customized transformer solutions.

Customization options include:

• Voltage ratio
• Frequency (50Hz/60Hz)
• Copper or aluminum winding
• Vector group
• Impedance value
• Tap changer type
• Tank structure
• Protection configuration
• Special environmental design

Customized solutions help ensure compatibility with different electrical systems.

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Q12: What maintenance does a 750kVA Oil-Immersed Transformer require?

A: Recommended maintenance includes:

• Checking transformer oil level
• Inspecting oil leakage
• Testing oil insulation condition
• Checking HV/LV bushings
• Inspecting electrical connections
• Measuring insulation resistance
• Checking grounding system
• Inspecting protection devices

Regular maintenance improves reliability and extends transformer service life.

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Q13: How does ZISHENG guarantee the quality of the 750kVA transformer?

A: ZISHENG applies strict quality control throughout manufacturing.

Quality procedures include:

Raw Material Inspection:

• Silicon steel core inspection
• Conductor material inspection
• Insulation material inspection
• Transformer oil testing

Production Inspection:

• Core assembly inspection
• Winding process inspection
• Insulation treatment inspection
• Tank welding inspection
• Vacuum oil filling inspection

Final Testing:

• Winding resistance test
• Insulation resistance test
• Voltage ratio test
• No-load loss test
• Load loss test
• Dielectric strength test
• Oil leakage test
• Temperature rise test

Only qualified transformers are delivered to customers.

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Q14: What standards can the 750kVA transformer comply with?

A: ZISHENG transformers can be manufactured according to:

• IEC standards
• ANSI standards
• Customer technical specifications
• Local electrical regulations

The applicable standard depends on the customer's project requirements and destination market.

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Q15: What is the service life of a 750kVA Oil-Immersed Transformer?

A: A high-quality 750kVA Oil-Immersed Transformer can provide decades of reliable operation with proper installation and maintenance.

The service life depends on:

• Operating load conditions
• Installation environment
• Maintenance quality
• Insulation condition
• Operating temperature

ZISHENG uses high-quality materials and strict production processes to ensure long-term stable performance.

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Q16: Why choose ZISHENG 750kVA 3-Phase Oil-Immersed Outdoor Substation Transformer?

A: ZISHENG provides:

• Professional transformer manufacturing experience
• Multiple production lines
• Advanced production technology
• High-quality raw materials
• Strict quality control
• Competitive factory pricing
• Customized engineering solutions
• Stable production capacity
• Reliable delivery capability
• Global export experience

ZISHENG 750kVA 3-Phase Oil-Immersed Outdoor Substation Transformer is a reliable power distribution solution for utility companies, EPC contractors, renewable energy developers, industrial enterprises, and electrical equipment distributors worldwide.