63 MVA / 110 kV Oil-Immersed OLTC Transformer Powers Ningxia LNG & Helium Project – ZHONGXIN GENERAL Case Study

Zhongxin General technical team after successful completion of 63000kVA 110kV transformer installation and commissioning at Ningxia helium LNG facility
ZX TRANSFORMER delivered a 63MVA/110kV oil-immersed OLTC transformer to Ningxia Helium Technology's LNG and helium production facility in July 2025. After six months of continuous operation, the transformer achieved zero downtime with stable voltage regulation. Our professional team managed complete project execution from design through installation and commissioning.

Table of Contents

Project Overview: Powering China’s Strategic Helium and Natural Gas Infrastructure

In July 2025, Zhongxin General (Sichuan Zhongxin General Electric Energy Co., Ltd.) successfully delivered a 63 MVA / 110 kV oil-immersed power transformer with on-load tap changer (OLTC) to Ningxia Helium Technology Co., Ltd. This critical power infrastructure supports China’s innovative 2 million cubic meters per day liquefied natural gas (LNG) and 600,000 cubic meters per year high-purity helium production facility.

Close-up view of transformer core and copper winding assembly for 110kV 63000kVA oil-immersed power transformer by Zhongxin General
Precision-wound copper coils and silicon steel core assembly demonstrating high-quality manufacturing standards

The project, located in Gaoshawo Industrial Park, Yanchi County, Ningxia Autonomous Region, represents a significant advancement in China’s natural gas processing capabilities and strategic helium extraction—a critical resource for semiconductor manufacturing, medical imaging, aerospace applications, and scientific research.

After six months of continuous operation, the 110 kV transformer continues to perform reliably under demanding industrial conditions. The customer has expressed strong appreciation for the ZHONGXIN GENERAL engineering team’s professional execution, technical expertise, and comprehensive support throughout the project lifecycle.

Client Background: Strategic Energy Development in Northwest China

Ningxia Helium Technology Co., Ltd., in strategic partnership with Sany Energy Equipment Co., Ltd., initiated this ambitious energy infrastructure project with a total investment of 520 million RMB. The facility represents one of China’s most advanced natural gas processing operations, combining LNG production with rare helium extraction capabilities.

Project Scale and Impact

The first phase of this multi-phase development focuses on:

  • 2 million m³/day natural gas liquefaction capacity
  • 600,000 m³/year high-purity helium production
  • 480,000 tons annual LNG output
  • 180 million RMB projected annual profit
  • 100+ employment opportunities for the local community
  • Advanced carbon capture integration for future phases

This natural gas processing facility requires exceptionally reliable and stable power infrastructure to maintain continuous operation of:

  • High-pressure compression systems
  • Precision decarburization units
  • Advanced dehydration equipment
  • Cryogenic liquefaction processes
  • Helium separation and purification systems

Any power interruption or voltage instability could compromise product quality, process safety, and operational efficiency—making the selection and performance of the 63000kVA power transformer absolutely critical to project success.

Technical Specifications: Engineering Excellence for Demanding Applications

Our 110kV oil-immersed power transformer was engineered specifically to meet the stringent requirements of continuous-process natural gas facilities, where reliability, efficiency, and voltage stability are paramount.

Professional technician installing OLTC mechanism on 63MVA 110kV oil-immersed power transformer manufactured by ZX TRANSFORMER for Ningxia LNG project
Installing the on-load tap changer mechanism that enables ±8-step voltage regulation without power interruption

Advanced Technical Features

1. Intelligent On-Load Tap Changing System

The OLTC transformer incorporates a sophisticated high-voltage side on-load tap changer enabling continuous voltage regulation without power interruption—a critical feature for sensitive gas processing operations.

OLTC Capabilities:

  • ±8-step regulation with precise voltage control
  • Compensation for ±10% voltage fluctuations in the grid
  • Continuous power supply during voltage adjustment operations
  • Automatic or manual operation modes
  • Position indication and remote monitoring
  • Maintenance-free design with extended service life

This intelligent voltage regulation ensures that downstream equipment receives stable power regardless of grid fluctuations, protecting sensitive instrumentation and maintaining consistent process conditions essential for high-purity helium extraction and LNG quality control.

Engineering team conducting final quality inspection of 63MVA transformer active part before lowering into oil tank at Zhongxin General facility
Final quality inspection verifying all dimensions, connections, and parameters before tank installation

2. Superior Insulation Performance

The oil-immersed design delivers exceptional insulation characteristics crucial for 110kV operation in industrial environments:

Insulation Specifications:

  • Power frequency withstand voltage: 200kV (1 minute) on HV side
  • Lightning impulse withstand voltage: 480kV on HV side
  • Partial discharge levels: <50pC at 1.5 times rated voltage
  • High-grade cellulose insulation materials
  • Vacuum-processed oil for superior dielectric strength
  • Multiple insulation barriers for enhanced reliability

The combination of premium mineral oil insulation and advanced solid insulation materials provides both excellent dielectric properties and superior heat transfer characteristics, ensuring long-term reliability even under continuous heavy load conditions.

3. Efficient ONAN Cooling System

The transformer utilizes high-quality plate-type radiators with natural oil circulation cooling, providing:

  • ONAN cooling method for silent, maintenance-free operation
  • Optimized radiator design maximizing heat dissipation surface area
  • Natural convection ensuring even temperature distribution
  • Extended service life through optimal thermal management
  • Reduced operational costs with no forced cooling equipment
  • Excellent performance even under peak load conditions
  • Ambient temperature operation range: -25°C to +40°C

The 80-ton transformer design incorporates sufficient cooling capacity to handle continuous operation at rated load with adequate thermal margins for temporary overload conditions.

4. Comprehensive Protection and Monitoring Systems

Multiple integrated protection mechanisms ensure safe, reliable operation:

Primary Protection:

  • Buchholz relay for internal fault detection
  • Pressure relief device for overpressure protection
  • Winding temperature monitoring with alarm and trip functions
  • Oil temperature monitoring and control

Secondary Protection:

  • Short-circuit protection coordination
  • Overload protection with configurable settings
  • Earth fault protection
  • Differential protection compatibility

Monitoring Systems:

  • Oil level indicators with remote signaling
  • Silica gel breather with color indication
  • Tap position indication (local and remote)
  • Diagnostic terminals for advanced testing

5. Smart Monitoring and Remote Management

The 110kV power transformer incorporates state-of-the-art monitoring technology enabling predictive maintenance and operational optimization:

Real-time Monitoring Capabilities:

  • Continuous temperature monitoring (winding and oil)
  • Current and voltage measurement at all terminals
  • Power factor and load monitoring
  • Tap changer position and operation counting
  • Oil quality indicators

Remote Capabilities:

  • Integration with SCADA systems
  • Remote diagnostics and fault analysis
  • Predictive maintenance alerts
  • Historical data logging and trending
  • Mobile notification options

These intelligent features significantly enhance operational efficiency, reduce maintenance costs, and maximize transformer uptime—critical factors for continuous-process facilities like natural gas liquefaction plants.

Manufacturing Excellence: Precision Engineering Meets Tight Deadlines

This transformer project presented significant challenges: strict delivery deadlines, complex technical requirements, and the need for customization to meet specific application demands. The ZHONGXIN GENERAL engineering and production teams demonstrated exceptional coordination and technical expertise throughout the project lifecycle.

Engineering Design Phase

Our engineering team worked closely with the customer to develop optimized solutions:

Custom Design Considerations:

  • Load profile analysis for gas processing operations
  • Voltage regulation requirements for stable process control
  • Environmental conditions in Ningxia region
  • Seismic design considerations for the installation location
  • Integration with existing electrical infrastructure
  • Future expansion capabilities

Advanced Engineering Tools:

  • 3D electromagnetic field simulation
  • Thermal analysis and cooling optimization
  • Short-circuit stress calculations
  • Acoustic noise prediction and mitigation
  • Tank and structure finite element analysis

Standards Compliance:

  • IEC 60076 series (Power Transformers)
  • GB 1094 series (Chinese National Standards)
  • Client-specific technical requirements
  • Environmental and safety regulations
Complete transformer tank bottom shell and mounting base for 110kV 63MVA oil-immersed power transformer with bell-type upper tank design at ZX TRANSFORMER factory
Complete transformer tank bottom shell and mounting base ready for active part installation, designed for upper tank bell-type assembly

Precision Manufacturing Process

Core Construction:

  • Premium grain-oriented silicon steel laminations
  • Step-lap core construction minimizing no-load losses
  • Multiple grounding points for safety
  • Precision stacking with minimal air gaps
  • Core compression system ensuring long-term stability

Winding Fabrication:

  • High-conductivity copper conductor
  • Continuous disk winding technology
  • Advanced transposition techniques reducing eddy current losses
  • Multiple insulation layers with precise dimensional control
  • Vacuum pressure impregnation for complete insulation
High-voltage transformer core lamination and insulation detail during assembly of 63000kVA unit for natural gas industry application
Detailed view of core lamination and specialized insulation layers designed for 110kV operation
Transformer winding assembly showing insulation layers and copper conductors for 63MVA power transformer manufactured by Zhongxin General
Multi-layer winding structure with advanced insulation system ensuring optimal electrical performance

Rigorous Quality Control and Testing

Every 63MVA power transformer undergoes comprehensive testing before leaving our factory, ensuring complete compliance with specifications and standards.

Factory Acceptance Tests

Routine Tests (performed on every transformer):

  1. Winding resistance measurement at all tap positions
  2. Voltage ratio and phase displacement verification
  3. No-load loss and current measurement
  4. Load loss and impedance voltage testing
  5. Insulation resistance measurement (Megger test)
  6. Dielectric tests:
    • Separate source AC withstand test
    • Induced overvoltage withstand test
  7. Measurement of zero-sequence impedance
  8. Verification of tap changer operation
  9. Tests on auxiliary devices and protection systems

Special Tests (as specified):

  1. Temperature rise test (heat run test)
  2. Lightning impulse withstand test (480kV)
  3. Switching impulse withstand test
  4. Measurement of acoustic sound level
  5. Short-circuit withstand capability verification
  6. Partial discharge measurement
  7. Dissolved gas analysis (DGA) baseline
  8. Frequency response analysis (FRA)
Technicians conducting on-load tap changer functionality testing on 63000kVA transformer before vacuum drying at ZX TRANSFORMER factory
Pre-vacuum drying OLTC testing ensures proper mechanical operation before moisture removal process
Quality control testing of OLTC mechanism on 110kV power transformer ensuring voltage regulation capability for Ningxia gas processing facility
Comprehensive OLTC commissioning including operation counting, contact resistance, and sequencing verification

OLTC-Specific Testing:

  • Mechanical operation tests (50 full cycles minimum)
  • Contact resistance measurement
  • Timing and sequencing verification
  • Transition resistance measurement
  • Motor drive system testing
  • Position indication verification
  • Oil tightness tests
Engineering team conducting final quality inspection of 63MVA transformer active part before lowering into oil tank at Zhongxin General facility
Final quality inspection verifying all dimensions, connections, and parameters before tank installation

Final Assembly and Preparation

After successful completion of all tests, the transformer underwent final assembly procedures:

Active Part Installation:

  • Precision lowering of core-coil assembly into tank
  • Alignment and positioning verification
  • Connection of tap changer to external controls
  • Installation of bushing turrets and insulation
Core-coil assembly lowered into oil tank with subsequent connection and assembly work at Zhongxin General transformer manufacturing facility
Active part successfully lowered into transformer tank with subsequent assembly and testing work at ZHONGXIN GENERAL factory

Oil Processing:

  • Vacuum oil filling eliminating moisture and air
  • Oil filtration to meet dielectric strength requirements
  • Degassing treatment
  • Final oil sampling and laboratory analysis
  • Oil preservation system activation

Final Preparations:

  • Installation of auxiliary equipment
  • Painting and corrosion protection
  • Preparation of technical documentation
  • Packaging for transportation
  • Quality certificate issuance

The entire manufacturing process, from initial design to factory shipment, was completed within the specified timeline despite the complexity and size of this 63000kVA oil-immersed transformer, demonstrating our team’s efficiency and commitment to customer satisfaction.

Transportation and Logistics: Moving 80 Tons with Precision

Delivering a 80-ton transformer from Sichuan Province to Ningxia Autonomous Region required meticulous planning and specialized logistics:

Transportation Challenges:

  • Total weight: 80 tons (core transformer unit)
  • Route planning: Sichuan to Ningxia (~1,500km)
  • Road restrictions and bridge weight limits
  • Special permits and route surveys
  • Radiator panels shipped separately for on-site assembly

Logistics Solutions:

  • Heavy-duty specialized transformer transportation vehicle
  • Route survey and obstacle assessment
  • Police escort coordination where required
  • Real-time GPS tracking
  • Shock and vibration monitoring during transit
  • Insurance coverage for high-value cargo

The transformer was transported with radiator panels removed to reduce height and weight, enabling passage through standard infrastructure. Radiators were separately packaged and shipped for on-site assembly—a common practice for large power transformers.

Installation and Commissioning: On-Site Excellence in Ningxia

Upon arrival at the Ningxia Helium Technology facility in Gaoshawo Industrial Park, our experienced installation team executed a comprehensive commissioning program ensuring perfect integration with the customer’s electrical infrastructure.

Pre-Installation Preparation

Site Readiness Verification:

  • Foundation inspection and acceptance
  • Dimensional verification of mounting points
  • Grounding system installation confirmation
  • Cable trench and conduit preparation
  • Clearance verification for maintenance access
  • Fire protection system readiness

Equipment Inspection:

  • Post-transportation condition assessment
  • Oil sampling and dielectric testing
  • Visual inspection of all components
  • Verification of accessory equipment
  • Documentation review

Professional Installation Process

Main Transformer Positioning:

  • Heavy-lift crane operation (100-ton capacity)
  • Precision alignment on foundation
  • Leveling within specified tolerances
  • Anchor bolt installation and torqueing
  • Anti-vibration pad installation

Radiator Assembly and Installation:

Following transformer positioning, our technical team assembled and connected the cooling radiator system on-site:

Installation crew assembling ONAN cooling radiators on 63MVA oil-immersed transformer at Gaoshawo Industrial Zone, Ningxia
On-site radiator installation work enabling rapid transformer deployment and system integration
Field assembly of cooling radiators for 110kV power transformer at Ningxia natural gas processing plant by ZX TRANSFORMER installation team
Field assembly of ONAN cooling radiator system at customer site to expedite transformer commissioning and operation

Radiator Installation Steps:

  • Unpacking and inspection of radiator panels
  • Gasket installation and sealing surface preparation
  • Radiator mounting to transformer tank
  • Piping connection and leak testing
  • Oil valve operation verification
  • Final tightness inspection

Bushing and Connection Work:

  • High-voltage bushing installation (110kV side)
  • Low-voltage bushing installation (10.5kV side)
  • Terminal connector preparation
  • Cable connection and torqueing
  • Creepage distance verification
  • Porcelain cleaning and insulation verification

Auxiliary Systems Integration:

  • OLTC motor drive connection
  • Control cabinet installation and wiring
  • Protection relay integration
  • Temperature monitoring system connection
  • Remote monitoring equipment setup
  • SCADA system integration

Comprehensive Commissioning Activities

Before energization, extensive testing verified all systems:

Pre-Energization Checks:

  • Insulation resistance testing
  • Winding resistance verification
  • Turns ratio confirmation
  • Polarity and phase sequence verification
  • OLTC operation tests (all tap positions)
  • Oil sample analysis (moisture, dielectric strength, DGA)
  • Buchholz relay functionality test
  • Temperature monitoring system calibration

Energization Sequence:

  1. Initial energization at no-load
  2. Voltage and current verification
  3. Temperature monitoring during heat-up
  4. Tap changer operation under load
  5. Load application in stages
  6. Full-load operation verification
  7. Protection system coordination testing

Performance Verification:

  • Voltage regulation performance
  • Load sharing with parallel transformers
  • Harmonic measurements
  • Acoustic noise level verification
  • Thermal performance monitoring
  • Efficiency calculation

Training and Documentation:

  • Customer operations team training
  • Maintenance personnel instruction
  • Documentation handover (drawings, test reports, manuals)
  • Spare parts inventory review
  • Emergency procedures review

The complete installation and commissioning process was executed smoothly and completed on schedule, with the transformer successfully energized and placed into commercial operation in July 2025.

Zhongxin General technical team after successful completion of 63000kVA 110kV transformer installation and commissioning at Ningxia helium LNG facility
ZHONGXIN GENERAL professional team celebrating successful project delivery at Ningxia Helium Technology facility

Project Outcomes: Six Months of Proven Performance

Operational Excellence

Since commissioning in July 2025, the 63MVA/110kV oil-immersed power transformer has delivered outstanding performance supporting critical natural gas liquefaction and helium extraction operations:

Performance Highlights:

  • Zero unplanned downtime over six months of continuous operation
  • Stable voltage regulation maintaining ±1% output voltage stability
  • Excellent thermal performance with winding temperatures well within design limits
  • Reliable OLTC operation adapting seamlessly to grid voltage variations
  • Smooth integration with facility automation and monitoring systems
  • Consistent efficiency maintaining high power factor under varying loads

Environmental Conditions: The transformer has operated reliably through Ningxia’s challenging climate conditions:

  • Summer temperatures exceeding 35°C
  • Winter temperatures dropping below -20°C
  • Significant daily temperature variations
  • Dust and sand exposure in industrial environment
  • High altitude effects (approximately 1,500m elevation)

Client Feedback and Satisfaction

Representatives from Ningxia Helium Technology Co., Ltd. have expressed strong satisfaction with both the transformer performance and the comprehensive support provided by the ZHONGXIN GENERAL team:

“The 110kV transformer has proven absolutely reliable since commissioning. The stable power supply is critical for our helium extraction process where even minor voltage fluctuations could affect product purity. The ZHONGXIN GENERAL team demonstrated exceptional professionalism throughout the project, from initial design consultation through installation and commissioning. We appreciate their technical expertise and responsive support.”

The transformer has become an integral part of the facility’s power infrastructure, enabling:

  • Continuous operation of compression equipment
  • Stable power for cryogenic systems
  • Reliable supply for control and instrumentation
  • Support for future facility expansion phases

Contributing to Strategic National Goals

This project supports China’s strategic objectives in several key areas:

Energy Security:

  • Domestic LNG production reducing import dependence
  • Strategic helium supply for high-tech industries
  • Clean energy infrastructure development

Economic Development:

  • Local employment creation
  • Industrial development in Northwest China
  • Technology advancement in gas processing

Environmental Protection:

  • Natural gas as cleaner fossil fuel alternative
  • Carbon capture integration for future phases
  • Support for China’s carbon neutrality goals

Why Choose ZHONGXIN GENERAL for Your Power Infrastructure?

Comprehensive Capabilities for Complex Projects

The successful delivery of this 63000kVA transformer for helium and LNG applications demonstrates Zhongxin General’s core competencies:

Engineering Excellence:

  • 30+ years of transformer design and manufacturing experience
  • Advanced simulation and modeling capabilities
  • Custom solutions for unique application requirements
  • Compliance with international standards (IEC, IEEE, GB, ANSI)
  • Energy efficiency optimization expertise

Manufacturing Quality:

  • ISO 9001 certified quality management systems
  • State-of-the-art production facilities
  • Precision manufacturing equipment
  • Comprehensive testing capabilities
  • Rigorous quality control at every stage

Project Management:

  • Proven ability to meet tight deadlines
  • Effective coordination across engineering, production, and logistics
  • Risk management and contingency planning
  • Clear communication throughout project lifecycle
  • Complete documentation and traceability

Technical Support:

  • Experienced installation and commissioning teams
  • Comprehensive training programs
  • Responsive after-sales support
  • Spare parts availability
  • Long-term technical consultation

Diverse Product Portfolio

While our oil-immersed power transformers excel in high-voltage utility applications like this Ningxia project, ZHONGXIN GENERAL manufactures a comprehensive range of electrical equipment:

Oil-Immersed Power Transformers:

  • Voltage classes: 10kV to 132kV
  • Capacities: 30kVA to 100MVA
  • Distribution and power transformers
  • Special application designs
  • ONAN, ONAF, OFAF cooling options

Dry-Type Transformers:

  • Voltage classes: up to 35kV
  • Capacities: 30kVA to 10MVA
  • Cast resin and air-cooled designs
  • Indoor installation advantages
  • Fire-safe applications

Our dry-type transformer technology has proven equally reliable in critical applications. For example, our cast resin transformers power the intelligent electrical system at Xinjin People’s Hospital, where uninterrupted power supply is literally a matter of life and death. This healthcare project demonstrates our versatility across both industrial and institutional applications.

Special Transformers:

  • Rectifier transformers for electrochemical processes
  • Furnace transformers for industrial heating
  • Mining transformers for harsh environments
  • Renewable energy transformers (wind, solar)
  • Custom-engineered solutions

Voltage Regulation Equipment:

  • On-load tap changers (OLTC)
  • Automatic voltage regulators
  • Booster transformers
  • Phase-shifting transformers

Industry Applications: Proven Performance Across Sectors

Our transformer solutions serve diverse industrial applications globally:

Oil & Gas Industry:

  • LNG facilities (like this Ningxia project)
  • Gas processing plants
  • Pipeline compression stations
  • Offshore platforms and FPSOs
  • Refineries and petrochemical complexes

Mining & Minerals:

  • Large-scale mining operations
  • Ore processing facilities
  • Smelting and refining operations
  • Remote mining camps
  • Mineral processing plants

Power Generation:

  • Thermal power plants
  • Combined cycle facilities
  • Cogeneration systems
  • Power distribution networks
  • Grid interconnection projects

Renewable Energy:

  • Wind farm substations
  • Solar power plants
  • Hydroelectric facilities
  • Energy storage systems
  • Microgrid applications

Heavy Industry:

  • Steel mills and foundries
  • Cement production facilities
  • Chemical processing plants
  • Manufacturing complexes
  • Data centers

Infrastructure:

  • Airports and transportation hubs
  • Hospital and healthcare facilities
  • Commercial buildings
  • Educational institutions
  • Government facilities

Global Service Capability

With growing presence in international markets, ZHONGXIN GENERAL provides comprehensive support to customers worldwide:

Primary Markets:

  • Middle East: Power infrastructure, oil & gas facilities
  • Southeast Asia: Industrial development, mining operations
  • Africa: Resource extraction, power distribution
  • Central Asia: Energy infrastructure, industrial projects
  • Domestic China: All sectors and applications

Service Offerings:

  • Pre-sales technical consultation and application engineering
  • Custom design and specification development
  • Factory acceptance testing with customer witnesses
  • Installation supervision and commissioning support
  • Operator and maintenance training programs
  • Comprehensive spare parts supply
  • Emergency technical support
  • Long-term service agreements
  • Performance optimization consulting

Technical Support Infrastructure:

  • 24/7 technical hotline
  • Remote diagnostics capabilities
  • Field service engineers
  • Application specialists
  • Multilingual documentation
  • Video conferencing for remote support

Commitment to Innovation and Sustainability

ZHONGXIN GENERAL continuously invests in technology advancement and environmental responsibility:

Innovation Focus:

  • Amorphous metal cores for ultra-low losses
  • Biodegradable insulating fluids
  • Advanced monitoring and diagnostics
  • Digital twin technology
  • Smart grid integration
  • Modular designs for easy maintenance

Sustainability Initiatives:

  • Energy-efficient designs reducing operational losses
  • Recyclable materials in transformer construction
  • Extended lifecycle reducing replacement frequency
  • Proper disposal and recycling programs
  • Environmental management systems certification
  • Carbon footprint reduction in manufacturing

Technical Advantages: Oil-Immersed Transformer Technology

When to Choose Oil-Immersed Power Transformers

Oil-immersed transformers like our 110kV unit excel in specific applications:

Ideal Applications:

  • High voltage levels (35kV and above)
  • Outdoor installations exposed to weather
  • High capacity requirements (multi-MVA ratings)
  • Cost-sensitive projects seeking economic solutions
  • High overload capability requirements
  • Harsh environmental conditions

Benefits of Oil-Immersed Design

1. Superior Cooling Efficiency

  • Oil circulation provides excellent heat dissipation
  • Natural convection eliminates need for forced cooling
  • Even temperature distribution across windings
  • High thermal capacity enabling overload capability
  • Silent operation with no cooling fans

2. Strong Overload Capability

  • Can handle temporary load peaks beyond rated capacity
  • Thermal mass allows short-duration overloads
  • Important for applications with variable loads
  • Provides operational flexibility

3. Long Service Life

  • Properly maintained oil-immersed transformers operate 30+ years
  • Oil provides both cooling and insulation preservation
  • Proven technology with extensive operational history
  • Well-established maintenance procedures

4. High Insulation Strength

  • Oil provides superior dielectric properties
  • Self-healing characteristics after minor discharges
  • Excellent arc quenching capabilities
  • Suitable for high voltage applications

5. Cost-Effectiveness

  • Lower initial investment for high-capacity units
  • Economical for outdoor installations
  • Widely available spare parts
  • Established maintenance infrastructure

6. Robust Construction

  • Weather-resistant tank design
  • Suitable for harsh environments
  • Dust and contamination protection
  • Seismic resistance capabilities

Modern Environmental Considerations

Contemporary oil-immersed transformers incorporate environmental protections:

Environmental Features:

  • Biodegradable insulating oils available for sensitive locations
  • Double-wall tanks with leak detection for critical installations
  • Oil containment systems preventing environmental contamination
  • Oil recycling programs for end-of-life equipment
  • Reduced oil volumes through optimized designs
  • Fire-resistant fluids for high-risk locations

Safety Systems:

  • Pressure relief devices preventing tank rupture
  • Buchholz relays detecting internal faults
  • Temperature monitoring with automatic shutdown
  • Oil level indicators with alarms
  • Nitrogen blanketing systems preventing oxidation

The Ningxia project transformer incorporates high-quality mineral oil meeting environmental standards, complete leak prevention systems, and oil containment provisions protecting the industrial park environment.

Future Developments: Supporting Ningxia’s Energy Evolution

The successful delivery of this 63000kVA power transformer represents the foundation phase of Ningxia Helium Technology’s ambitious multi-year development plan.

Planned Facility Expansions

Phase 2 Developments (2025-2027):

  • High-purity helium liquefaction facility (increasing value-added processing)
  • Carbon capture, utilization, and storage (CCUS) systems
  • 30,000 tons/year new energy carbon materials production
  • 50,000 tons/year fuel ethanol production facility
  • Expanded natural gas processing capacity

Electrical Infrastructure Requirements: These expansion phases will require additional power infrastructure, including:

  • Additional distribution transformers (35kV class)
  • Specialized rectifier transformers for electrochemical processes
  • Harmonic filtering equipment
  • Power factor correction systems
  • Backup power systems

ZHONGXIN GENERAL stands ready to support these developments with:

  • Engineering consultation for expansion phases
  • Custom transformer solutions for specialized processes
  • Coordinated delivery schedules aligned with construction
  • Integration with existing electrical infrastructure
  • Long-term service and support agreements

Contributing to Regional Development

This project contributes to broader regional development initiatives:

Economic Impact:

  • Industrial cluster development in Gaoshawo Industrial Park
  • Technology transfer and local capability building
  • Supply chain development for gas processing industry
  • Attraction of downstream industries utilizing LNG and helium

Infrastructure Development:

  • Electrical grid strengthening in Northwest China
  • Natural gas pipeline infrastructure expansion
  • Transportation and logistics improvement
  • Industrial park utilities development

Technology Advancement:

  • Advanced gas processing technology deployment
  • Helium extraction expertise development
  • Cryogenic engineering capabilities
  • Process automation and control systems

Contact ZHONGXIN GENERAL for Your Next Project

Whether you’re developing natural gas infrastructure, renewable energy facilities, mining operations, industrial complexes, or any application requiring reliable high-voltage power transformation, Zhongxin General has the expertise, experience, and products to meet your needs.

Our Commitment to Your Success

Engineering Partnership: We approach every project as a partnership, working closely with customers to understand requirements, optimize solutions, and ensure successful outcomes.

Quality Without Compromise: 30+ years of manufacturing excellence, ISO-certified processes, and unwavering commitment to quality ensure that every transformer meets the highest standards.

Global Reach, Local Support: With international project experience and growing global presence, we combine world-class engineering with responsive local support.

Long-Term Relationship: Our relationship doesn’t end with delivery—we provide comprehensive lifecycle support ensuring optimal performance throughout your transformer’s operational life.

Why Leading Companies Choose ZHONGXIN GENERAL

Proven Track Record – Thousands of transformers operating reliably worldwide

Technical Expertise – Advanced engineering capabilities and custom solutions

Manufacturing Excellence – State-of-the-art facilities and quality systems

Comprehensive Testing – Rigorous verification ensuring specification compliance

On-Time Delivery – Project management excellence meeting tight deadlines

Complete Support – Installation, commissioning, training, and after-sales service

Competitive Pricing – Economic solutions without compromising quality

Global Experience – International projects across diverse applications

Standards Compliance – IEC, IEEE, GB, ANSI, and customer-specific requirements

Lifecycle Partnership – Long-term support maximizing transformer value

Get Expert Consultation

Our engineering team is available to discuss your power transformer requirements and develop optimal solutions for your specific application:

Services We Provide:

  • Application analysis and needs assessment
  • Technical specifications review and optimization
  • Custom design proposals and engineering drawings
  • Competitive quotations with transparent pricing
  • Project timeline planning and coordination
  • Installation and commissioning support
  • Training programs for operations and maintenance personnel
  • Long-term service agreements

Industries We Serve:

  • Oil & Gas (LNG, processing, pipelines)
  • Mining & Minerals (extraction, processing, smelting)
  • Power Generation (thermal, renewable, cogeneration)
  • Manufacturing (heavy industry, chemicals, materials)
  • Infrastructure (buildings, transportation, facilities)
  • Special Applications (custom requirements)

Connect With Us

Website: www.zxtransformer.com/contact-us/

Explore Our Solutions:

Kevin Z

About the Author

Kevin Z

Kevin holds dual academic backgrounds in Electrical Engineering and English Language. He is a core member of two selective professional communities — a group of elite electrical engineers and a high-level ESL learning circle. With over 15 years of experience in international marketing and sales, Kevin currently serves as Director of International Trade at Zhongxin General.

Beyond his corporate role, Kevin is also a key member of a distinguished export business network based in Ningbo, Zhejiang — one of China’s most dynamic trade hubs. Through this circle of outstanding export enterprises, he gains deep exposure to best practices in business operations, management strategies, and global trade — insights he brings directly to his work and writing.

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SZ13-8000/120 OLTC transformer at Lianyungang port ready for vessel loading — China export DR Congo view 1

When Your Transformer Doesn’t Fit the Ship: A Real Lesson in Large Equipment Export Logistics from China

A real account of what happened when the allocated vessel space at Shanghai Port could not accommodate an 8,000 kVA 120kV OLTC transformer main tank during export to a DR Congo power station project — the rerouting to Lianyungang Port, the two-and-a-half-month delay, and the practical lessons learned. Written for international buyers and EPC procurement teams planning to source large power transformers from China. Includes recommendations on vessel space booking, port selection for heavy-lift cargo, nitrogen transport verification, and split shipment planning.

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Heavy transport truck carrying SZ13-8000/120 OLTC transformer leaving Zhongxin General factory 7PM, 16th, September 2025

8000kVA 120kV OLTC Power Transformer Exported to DR Congo — Full Project Case Study

Zhongxin General exported a SZ13-8000/120 on-load tap-changing power transformer — 8,000 kVA, 120kV class, 27.8 tonnes total weight — to a power station project in the Democratic Republic of Congo. Independent quality inspection was personally overseen by a former General Manager of Chint Electric’s transformer division. The shipment navigated a real-world logistics challenge when vessel space constraints at the original port required rerouting via Lianyungang. The unit arrived at Mtwara Port, Tanzania on February 4, 2026, with package condition verified as no damage. Switchgear supplied as part of the complete package.

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Zhongxin General factory main gate and front facade — Xinjin District Chengdu Sichuan China

From ZX TRANSFORMER to ZHONGXIN GENERAL: Our Brand Has a New Name

Effective March 2026, Sichuan Zhongxin General Electric Energy Co., Ltd. has officially rebranded its international identity from ZX TRANSFORMER to ZHONGXIN GENERAL — aligning with our product nameplate identity and reflecting an expanded portfolio that now spans transformers, switchgear, prefabricated substations, energy storage, and EV charging infrastructure. Our website, legal entity, products, team, and certifications remain unchanged.

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SZ20-31500/35 OLTC transformer fully installed on substation foundation — Jing Teng Energy Alar City Xinjiang

31,500 kVA OLTC Transformer Powers New 35kV Substation for Alar Jing Teng Energy — Xinjiang

Zhongxin General delivered a SZ20-31500/35 on-load tap-changing transformer for Jing Teng Energy Co., Ltd.’s new dedicated 35kV substation at their Alar City, Xinjiang industrial production base. Rated at 31,500 kVA with a 7-position OLTC providing ±7.5% on-load voltage regulation, this unit was delivered January 12, 2026 and confirmed in full operation by March 2026. This case study covers the complete project lifecycle: factory manufacturing, delivery, on-site installation, and commissioned operation. Also available in 33kV, 34.5kV and 36kV for international substation projects.

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Zhongxin General management and sales team — Sichuan Zhongxin General Electric Energy Co., Ltd., China

We’re Recruiting: Part-Time Regional Business Representatives Worldwide | Zhongxin General

Zhongxin General is recruiting part-time regional business representatives worldwide — a flexible, commission-based opportunity for energy and electrical industry professionals to represent a Chinese National Little Giant transformer manufacturer in their local market. Ideal for professionals with existing networks in utilities, EPC contracting, renewable energy, or industrial power. Fully remote, work around your existing schedule. Compensation and terms discussed individually by email.

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