Electrical Performance Specifications

Mechanical Specifications

Environmental Specifications

Optional Technical Configurations

ZISHENG provides flexible customization options for different power distribution projects.

Voltage Customization

Available options:

• Primary voltage adjustment
• Secondary voltage adjustment
• 50Hz / 60Hz frequency selection
• Special voltage ratio requirements

Winding Customization

Options:

• High conductivity copper winding
• Cost-effective aluminum winding
• High-efficiency low-loss winding design

Protection Accessories

Optional accessories include:

• High-voltage load break switch
• Fuse protection system
• Lightning arrester
• Pressure relief device
• Oil temperature indicator
• Oil level indicator
• Temperature monitoring system
• Grounding accessories

Enclosure Customization

Available options:

• Different cabinet sizes
• Enhanced anti-corrosion coating
• High-temperature protection design
• Coastal environment protection
• High-humidity protection
• Customized cable entry arrangement

Testing and Standards

The 75kVA Three Phase Pad Mounted Transformer can be manufactured according to:

• IEC 60076 standards
• ANSI standards
• IEEE requirements
• Customer-specific technical specifications

Routine factory tests include:

• Winding resistance test
• Voltage ratio test
• Vector group test
• Insulation resistance test
• Dielectric withstand test
• No-load loss test
• Load loss test
• Short-circuit impedance test
• Oil leakage test
• Final appearance inspection

Note: The above technical specifications are reference values. The final transformer design will be confirmed according to customer voltage requirements, local grid standards, installation conditions, and project technical specifications.

ZISHENG provides professional customization services for the 75kVA Three Phase Pad Mounted Transformer according to different grid requirements, project specifications, installation environments, and customer application needs.

With flexible engineering capabilities and advanced manufacturing technology, ZISHENG can customize transformer solutions for utility companies, EPC contractors, commercial developments, industrial facilities, and renewable energy projects worldwide.

1. Voltage Configuration Customization

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

Primary Voltage Options (Medium Voltage Side)

Available configurations include:

• 6.6kV
• 10kV
• 11kV
• 13.8kV
• 15kV
• 20kV
• 22kV
• 33kV

Secondary Voltage Options (Low Voltage Side)

Available configurations include:

• 380V
• 400V
• 415V
• 480V
• 600V
• Customized voltage levels

Additional options:

• Special voltage ratio
• Dual voltage output
• Customized tap settings

2. Winding Material Customization

ZISHENG offers different winding material solutions according to customer requirements and project budgets.

Copper Winding

Advantages:

• High electrical conductivity
• Lower power losses
• Excellent thermal performance
• Strong short-circuit resistance
• Suitable for high-reliability applications

Recommended for:

• Utility networks
• Industrial facilities
• Critical power systems

Aluminum Winding

Advantages:

• Cost-effective solution
• Reduced transformer weight
• Good electrical performance
• Suitable for general distribution applications

3. Frequency Customization

The 75kVA Three Phase Pad Mounted Transformer can be manufactured according to different power system frequencies.

Available options:

• 50Hz
• 60Hz

This ensures compatibility with electrical networks in different countries and regions.

4. Core Design Customization

ZISHENG can optimize the transformer magnetic core according to efficiency requirements.

Customization options:

• High-quality grain-oriented silicon steel core
• Step-lap core design
• Low-loss core structure
• Energy-efficient electromagnetic design

Benefits:

• Reduced no-load losses
• Lower operating temperature
• Improved efficiency
• Longer service life

5. Connection and Vector Group Customization

Different connection configurations can be provided according to system requirements.

Available options:

• Dyn11
• Yyn0
• Customized vector groups

Customization includes:

• Primary connection method
• Secondary connection method
• Phase configuration
• Terminal arrangement

This ensures compatibility with different distribution systems.

6. Tap Changer Customization

Voltage adjustment solutions can be customized according to grid voltage fluctuations.

Options include:

• Off-circuit tap changer
• ±2×2.5% adjustment range
• ±5% adjustment range
• Customized tap positions

Benefits:

• Improved voltage stability
• Better grid adaptability
• Reliable power supply performance

7. Enclosure and Cabinet Customization

The pad mounted enclosure can be customized for different installation environments.

Options include:

• Standard outdoor enclosure
• Enhanced anti-corrosion cabinet
• High-security locking system
• Customized cabinet dimensions
• Special cable entry arrangement

Benefits:

• Improved equipment protection
• Better environmental resistance
• Enhanced installation flexibility

8. Protection System Customization

ZISHENG provides various protection accessories according to project requirements.

Optional protection devices include:

• High-voltage fuse protection
• Load break switch
• Lightning arrester
• Surge protection device
• Pressure relief device
• Oil temperature indicator
• Oil level indicator
• Temperature monitoring system
• Grounding protection accessories

These solutions improve transformer safety and operational reliability.

9. Cable Connection Customization

The transformer connection system can be customized according to installation requirements.

Options include:

• Underground cable connection
• High-voltage cable compartment
• Low-voltage cable compartment
• Different cable entry directions
• Customized terminal arrangements

This allows easier integration into existing power distribution systems.

10. Oil and Insulation Customization

Different insulation solutions can be selected according to environmental and project requirements.

Options include:

• High-quality mineral transformer oil
• Environment-friendly insulating fluid
• Enhanced moisture protection design
• Improved insulation structure

Benefits:

• Better insulation reliability
• Improved heat dissipation
• Extended service life

11. Environmental Adaptation Customization

ZISHENG provides special designs for challenging operating environments.

Customization options:

• High-temperature protection
• High-humidity protection
• Coastal corrosion resistance
• Dust-resistant design
• Tropical climate adaptation
• High-altitude operation

Suitable for:

• Africa
• Southeast Asia
• Middle East
• South America
• Other harsh environments

12. Energy Efficiency Customization

For projects requiring lower operating costs, ZISHENG provides optimized energy-saving solutions.

Options include:

• Low-loss silicon steel core
• Reduced no-load loss design
• Reduced load loss design
• High-efficiency transformer configuration

Benefits:

• Lower energy consumption
• Reduced operating costs
• Improved power system efficiency

13. Monitoring and Smart Function Customization

For advanced power management applications, optional monitoring solutions are available.

Options include:

• Temperature monitoring system
• Remote monitoring interface
• Digital measurement devices
• Smart operation monitoring

Suitable for:

• Smart grids
• Industrial automation systems
• Renewable energy projects

14. Standards and Documentation Customization

ZISHENG can manufacture transformers according to different international standards and customer specifications.

Applicable standards:

• IEC 60076
• ANSI standards
• IEEE requirements
• Customer-specific standards

Available documents:

• Technical drawings
• Factory test reports
• Quality certificates
• Product compliance documents
• Inspection records

Complete Customized Transformer Solution

ZISHENG provides full technical support from design confirmation to final delivery:

1. Project requirement analysis
2. Technical parameter confirmation
3. Customized design proposal
4. Production manufacturing
5. Factory testing
6. Export packaging and delivery

With professional customization capability, the 75kVA Three Phase Pad Mounted Transformer can be configured to meet various power distribution requirements, providing customers with safe, efficient, and reliable transformer solutions for urban networks, commercial projects, industrial facilities, and renewable energy applications worldwide.

ZISHENG performs strict routine testing on every 75kVA Three Phase Pad Mounted Transformer before shipment to verify electrical performance, insulation reliability, structural quality, and operational safety.

Each transformer undergoes individual testing according to customer requirements and applicable international standards. The routine testing process ensures that every unit delivered to customers can operate safely and reliably in underground and outdoor power distribution systems.

1. Winding Resistance Test

The winding resistance test is performed to verify the electrical condition and manufacturing quality of transformer windings.

Testing includes:

• High-voltage winding resistance measurement
• Low-voltage winding resistance measurement
• Three-phase resistance balance verification
• Connection quality inspection

The test helps ensure:

• Stable current distribution
• Reliable electrical connections
• Consistent transformer performance

2. Voltage Ratio Test

The voltage ratio test confirms the accuracy of the transformer voltage conversion function.

The test verifies:

• Primary-to-secondary voltage ratio
• Rated voltage accuracy
• Tap position performance
• Voltage regulation capability

This ensures the transformer matches the customer’s power system requirements.

3. Vector Group Test

As a three-phase transformer, the vector group test is performed to confirm correct phase relationships.

Testing items include:

• Phase displacement measurement
• Winding connection verification
• Phase sequence confirmation
• Vector group identification

This ensures safe connection and proper operation within three-phase distribution networks.

4. Insulation Resistance Test

The insulation resistance test evaluates the condition and reliability of the transformer insulation system.

Testing includes:

• High-voltage winding insulation
• Low-voltage winding insulation
• Winding-to-ground insulation

The test confirms:

• Insulation strength
• Electrical safety
• Moisture resistance
• Long-term reliability

5. Dielectric Withstand Test

The dielectric withstand test checks the ability of the insulation system to withstand electrical stress.

Testing includes:

• High-voltage withstand test
• Low-voltage insulation verification
• Ground insulation performance check

This ensures the transformer can safely operate under normal grid conditions and temporary voltage fluctuations.

6. No-Load Loss Test

The no-load loss test evaluates the transformer core performance when the secondary side is open.

The test measures:

• No-load power loss
• Core loss performance
• Energy efficiency characteristics

Benefits:

• Confirms low-loss design
• Verifies core manufacturing quality
• Helps reduce operating costs

7. No-Load Current Test

The no-load current test measures the magnetizing current required for transformer operation.

The test verifies:

• Core magnetic performance
• Manufacturing consistency
• Transformer efficiency

It helps ensure economical and stable operation.

8. Load Loss Test

The load loss test evaluates transformer performance under rated operating conditions.

Testing includes:

• Load loss measurement
• Copper loss verification
• Efficiency evaluation

This confirms the transformer can provide stable power output during continuous operation.

9. Short-Circuit Impedance Test

The short-circuit impedance test verifies transformer impedance characteristics.

The test checks:

• Impedance value
• Voltage regulation performance
• Electrical stability

This helps ensure reliable operation during load changes and system faults.

10. Insulating Oil Inspection

For oil immersed pad mounted transformers, transformer oil quality is inspected to ensure proper insulation and cooling performance.

Inspection items include:

• Oil appearance
• Dielectric strength
• Oil cleanliness
• Insulation performance

This ensures long-term transformer reliability.

11. Oil Leakage Test

The transformer tank and sealing system undergo inspection to prevent oil leakage.

Testing includes:

• Tank sealing inspection
• Welding quality verification
• Bushing sealing inspection
• Leakage detection

This guarantees reliable outdoor operation and protects the insulation system.

12. Temperature Monitoring System Test (Optional)

If equipped with temperature monitoring devices, ZISHENG performs functional testing.

Testing includes:

• Temperature indicator operation
• Sensor inspection
• Alarm function verification
• Monitoring system performance

This improves operational safety and maintenance efficiency.

13. Mechanical and Appearance Inspection

A complete mechanical inspection is carried out before shipment.

Inspection items include:

• Transformer dimensions
• Nameplate information
• Enclosure condition
• Cabinet doors and locks
• Cable compartments
• Grounding terminals
• Accessories installation

This ensures the transformer meets approved drawings and delivery requirements.

14. Final Routine Test Report

After all tests are completed, ZISHENG provides a complete routine test report.

The report includes:

• Transformer technical parameters
• Test measurement results
• Inspection records
• Quality confirmation data

The report supports customer acceptance, installation, and project documentation.

Reliable Routine Testing Assurance

Through comprehensive routine testing procedures, ZISHENG ensures every 75kVA Three Phase Pad Mounted Transformer provides:

• Accurate electrical performance
• Reliable insulation protection
• Low energy consumption
• Strong operational stability
• Long service life

Strict factory routine testing guarantees dependable transformer performance for utility companies, commercial buildings, industrial facilities, renewable energy projects, and underground distribution networks worldwide.

1. What is a 75kVA Three Phase Pad Mounted Transformer?

A 75kVA Three Phase Pad Mounted Transformer is an oil immersed distribution transformer designed for ground-level installation in underground power distribution systems.

It converts medium-voltage electricity from utility networks into low-voltage power suitable for residential, commercial, industrial, and infrastructure applications.

Its enclosed cabinet structure provides enhanced safety, weather protection, and reliable operation in outdoor environments.

2. What are the main advantages of a pad mounted transformer?

The main advantages include:

• Compact ground installation
• Safe enclosed design
• Reduced visual impact
• Reliable underground cable connection
• High energy efficiency
• Strong environmental adaptability
• Low maintenance requirements
• Long service life

It is especially suitable for modern urban distribution networks where safety and space utilization are important.

3. What voltage ratings are available for the 75kVA transformer?

The transformer voltage configuration can be customized according to different country standards and project requirements.

Primary Voltage Options:

• 6.6kV
• 10kV
• 11kV
• 13.8kV
• 15kV
• 20kV
• 22kV
• 33kV

Secondary Voltage Options:

• 380V
• 400V
• 415V
• 480V
• 600V
• Customized voltage levels

ZISHENG can design the transformer according to local grid specifications.

4. Where is the 75kVA Three Phase Pad Mounted Transformer used?

It is widely applied in:

• Urban underground power networks
• Residential communities
• Commercial buildings
• Industrial facilities
• Renewable energy projects
• Data centers
• Public infrastructure
• Agricultural power systems

It is suitable for both utility and private power distribution applications.

5. Is the transformer suitable for outdoor installation?

Yes. The 75kVA Three Phase Pad Mounted Transformer is specifically designed for outdoor operation.

The protective enclosure provides:

• Weather resistance
• Dust protection
• Corrosion resistance
• Equipment security
• Protection against environmental conditions

It can be customized for tropical, coastal, high-temperature, and high-humidity environments.

6. What cooling method does the transformer use?

The standard cooling method is:

ONAN (Oil Natural Air Natural)

The transformer oil provides both insulation and cooling functions.

Advantages:

• Efficient heat dissipation
• Simple structure
• Reliable operation
• Low maintenance requirements
• Long service life

7. What winding materials are available?

ZISHENG provides two winding material options:

Copper Winding

Advantages:

• Excellent conductivity
• Lower electrical losses
• Better heat resistance
• Strong short-circuit capability
• Suitable for high-reliability projects

Aluminum Winding

Advantages:

• More economical
• Lightweight design
• Good electrical performance
• Suitable for general distribution systems

8. Can the transformer be customized?

Yes. ZISHENG provides customized solutions based on customer project requirements.

Customization options include:

• Primary and secondary voltage
• Frequency (50Hz / 60Hz)
• Copper or aluminum winding
• Vector group
• Tap changer configuration
• Enclosure design
• Protection accessories
• Cable connection method
• Anti-corrosion treatment
• Special environmental protection design

9. What protection accessories are available?

The transformer can be equipped with various protection devices, including:

• High-voltage fuse protection
• Load break switch
• Lightning arrester
• Surge protection device
• Pressure relief device
• Oil temperature indicator
• Oil level indicator
• Temperature monitoring system
• Grounding accessories

These accessories improve operational safety and reliability.

10. What standards does the transformer comply with?

The transformer can be manufactured according to:

• IEC 60076 standards
• ANSI standards
• IEEE requirements
• Customer-specific technical specifications

ZISHENG can provide related technical documents and test reports for project approval.

11. How does ZISHENG control transformer quality?

ZISHENG follows strict quality control procedures throughout manufacturing.

Quality control includes:

• Raw material inspection
• Core inspection
• Winding inspection
• Tank welding inspection
• Oil leakage testing
• Electrical performance testing
• Final factory inspection

Each transformer is tested before shipment.

12. What routine tests are performed before delivery?

The transformer undergoes complete factory routine testing, including:

• Winding resistance test
• Voltage ratio test
• Vector group test
• Insulation resistance test
• Dielectric withstand test
• No-load loss test
• No-load current test
• Load loss test
• Short-circuit impedance test
• Oil leakage inspection
• Appearance inspection

Test reports can be provided for customer verification.

13. What is the expected service life of a 75kVA pad mounted transformer?

Under normal operating conditions, the transformer can provide more than 20 years of reliable service life.

Actual service life depends on:

• Operating load conditions
• Installation environment
• Maintenance practices
• Protection configuration

14. How is the transformer packaged for export?

ZISHENG uses professional export packaging methods to protect the transformer during transportation.

Packaging includes:

• Strong wooden cases when required
• Moisture-proof protection
• External component protection
• Secure fixing
• Clear shipping marks

The packaging is suitable for sea, road, and rail transportation.

15. What shipping documents are provided?

Standard export documents include:

• Commercial invoice
• Packing list
• Certificate of origin
• Factory test report
• Quality certificate
• Technical specification documents
• Shipping documents

Additional documents can be prepared according to customer and project requirements.

16. What is the delivery time for a 75kVA Three Phase Pad Mounted Transformer?

Delivery time depends on:

• Product specifications
• Customization requirements
• Order quantity
• Production schedule
• Shipping destination

ZISHENG provides production planning and logistics coordination to support customer project schedules.

17. Can the transformer operate in harsh environments?

Yes. The transformer can be customized for challenging environments.

Optional designs include:

• High-temperature resistance
• High-humidity protection
• Coastal corrosion protection
• Dust-resistant structure
• Tropical climate adaptation
• High-altitude operation

These solutions improve reliability in demanding locations.

18. Why choose ZISHENG 75kVA Three Phase Pad Mounted Transformer?

ZISHENG provides:

• Professional transformer manufacturing experience
• Advanced production technology
• High-quality materials
• Strict testing procedures
• Competitive factory pricing
• Customized engineering solutions
• Reliable export service

The 75kVA Three Phase Pad Mounted Transformer delivers safe, efficient, and stable power distribution for utility networks, commercial facilities, industrial projects, renewable energy systems, and infrastructure developments worldwide.