Product Overview

The 330kV three-phase oil-immersed power transformer is a high-voltage grid solution designed for large-scale power transmission, regional interconnection, and major generation projects. With high insulation strength, optimized loss performance, and robust mechanical construction, it is suitable for high-capacity substations, power plants, renewable energy collection systems, and long-distance transmission networks.

330kV power transformers are particularly suitable for countries and regions where 330kV-class transmission networks are used for bulk power transfer and regional grid development. Typical markets and applications include China, Kazakhstan, Uzbekistan, Kyrgyzstan, Tajikistan, Pakistan, India, South Africa, Botswana, Namibia, Zambia, Zimbabwe, Tanzania, Mozambique, Ethiopia, Egypt, Saudi Arabia, the United Arab Emirates, Oman, Jordan, Turkey, Russia, Ukraine, Mongolia, and other countries or regions with corresponding high-voltage transmission requirements, subject to the local grid code and project specifications.

• Maximum Capacity: Up to 300MVA or customized according to project requirements
• Voltage Class: 330kV, with customized rated voltage and insulation configuration available
• Frequency: 50Hz / 60Hz
• Cooling Method: ONAN / ONAF / OFAF or customized cooling configuration
• Tap Changer: OLTC available for voltage regulation and grid voltage stability
• Design Lifespan: More than 30 years under properly specified operating conditions
• Fast Delivery: Standard lead time approximately 90 days; accelerated delivery solutions can be discussed for urgent projects

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Product Advantages

International Standards & Project Compliance

Our 330kV power transformers are designed and manufactured according to internationally recognized transformer standards, while the technical configuration can be adapted to the requirements of different utilities, EPC contractors, and grid operators.

• International Standards: Designed according to applicable requirements of IEC, GB, GOST, EN, ANSI/IEEE and other relevant standards, with project-specific engineering available for local grid codes and utility specifications.
• Testing & Quality Assurance: Factory testing and routine/ type-specific tests can be arranged according to the applicable standards and customer technical specifications.
• Certification Support: Documentation and certification can be provided according to destination-market requirements, including ISO, CE, IEC, SABS, COC, CSA, UL and other applicable compliance documents where required.

Key Product Advantages

High-Voltage Transmission Reliability

The 330kV transformer is engineered for demanding transmission applications where insulation coordination, short-circuit withstand capability, thermal performance, and long-term operational stability are critical. The optimized magnetic circuit and winding structure help achieve reliable operation under continuous and variable loads.

Designed for Large-Scale Power Systems

With high-capacity configurations available, the transformer can be used as a key interface between power generation facilities and high-voltage transmission networks. It is suitable for large thermal and hydroelectric power stations, regional substations, renewable energy transmission systems, and grid reinforcement projects.

Adaptable to Renewable Energy Integration

The transformer can be configured for renewable energy applications such as utility-scale solar PV, wind power, hydropower and hybrid renewable energy projects. Customized thermal design and voltage regulation solutions help accommodate variable generation profiles and changing grid conditions.

Adapted to Diverse Operating Environments

The transformer can be engineered for different installation conditions, including high-altitude areas, low-temperature regions, hot and humid climates, desert environments, coastal areas, and industrial zones with corrosive atmospheres. Special requirements such as enhanced cooling, creepage distance, enclosure protection and anti-corrosion treatment can be incorporated into the design.

Global Market Experience

Our transformers and related electrical equipment have been supplied to customers across Asia, Africa, the Middle East, Europe, Oceania and other international markets, supporting grid expansion, industrial electrification, renewable energy development and power transmission projects.

Typical 330kV Application Markets

330kV-class transmission systems and equipment can be found in different forms across a wide range of markets. Depending on local grid architecture and utility standards, typical application markets include:

• Central Asia: Kazakhstan, Uzbekistan, Kyrgyzstan, Tajikistan, Turkmenistan
• South Asia: Pakistan, India and surrounding high-voltage transmission markets
• East Asia: China and Mongolia
• Africa: South Africa, Botswana, Namibia, Zambia, Zimbabwe, Tanzania, Mozambique, Ethiopia, Egypt and other developing transmission markets
• Middle East: Saudi Arabia, United Arab Emirates, Oman, Jordan and other markets with large-scale transmission and generation projects
• Europe & Eurasia: Russia, Ukraine, Turkey and selected regional transmission systems
• Other Markets: Countries developing high-capacity transmission corridors, renewable energy evacuation systems and regional interconnection projects

The final voltage level, insulation coordination, transformer capacity, tap range, cooling system and testing requirements should always be confirmed according to the local utility grid code and project-specific technical specification.

Why Choose HENGFENGYOU Electric for Your 330kV Projects?

For a 330kV substation or transmission project, transformer selection involves considerably more than rated voltage and capacity. System insulation coordination, transport limitations, site conditions, cooling requirements, short-circuit performance and commissioning requirements all need to be considered during engineering.

Engineering-Focused Customization

HENGFENGYOU Electric provides project-oriented engineering rather than relying solely on standardized configurations. Our technical team can optimize the transformer design according to system voltage, capacity, short-circuit level, altitude, ambient temperature, humidity, cooling conditions, installation location and utility specifications.

For special projects, optional solutions such as OLTC, online temperature monitoring, oil level monitoring, pressure relief protection, Buchholz relay, advanced cooling systems and customized control cabinets can be integrated into the overall transformer package.

Efficient Manufacturing & Project Delivery

330kV transformers involve complex manufacturing, testing and logistics processes. HENGFENGYOU Electric coordinates engineering, raw-material procurement, manufacturing, assembly and testing to support efficient project execution.

For projects with strict construction schedules, an accelerated production and delivery plan can be evaluated according to transformer configuration, capacity, testing requirements and project priority.

Comprehensive High-Voltage Testing

Before shipment, each transformer undergoes comprehensive factory inspection and testing according to applicable standards and the approved technical specification.

Depending on the project, testing may include winding resistance measurement, voltage ratio and phase displacement tests, no-load and load-loss measurements, dielectric tests, induced voltage tests, lightning impulse tests, partial discharge measurements, temperature-rise tests and other specified tests.

This comprehensive testing process helps verify electrical performance, insulation integrity, thermal characteristics and mechanical reliability before the transformer leaves the factory.

International Technical Support & Lifecycle Service

HENGFENGYOU Electric supports customers throughout the project lifecycle, from technical clarification and transformer configuration to manufacturing, factory acceptance testing, international transportation, installation guidance and commissioning support.

For overseas projects, our technical team can provide documentation, installation instructions, operation and maintenance recommendations, spare-parts support and after-sales technical assistance to help maintain reliable transformer operation throughout its service life.

Ordering Instructions

To prepare an accurate technical proposal and quotation for a 330kV transformer, customers are recommended to provide the following information:

• Main Transformer Parameters: Rated voltage, rated capacity, frequency, vector group, impedance, no-load loss, load loss and other required technical parameters
• Grid & System Requirements: System voltage, short-circuit level, insulation level, neutral grounding requirements and applicable utility standards
• Operating Environment: Installation altitude, ambient temperature, humidity, wind conditions, pollution level, seismic conditions and installation location
• Transformer Configuration: Cooling method, tap changer type and range, bushing requirements, conservator arrangement, monitoring system and protection accessories
• Customization Requirements: Transformer color, oil type, accessories, control cabinet, cable interfaces, communication functions and other project-specific requirements
• Quantity: Minimum order quantity is 1 set
• Standard Delivery: Approximately 90 days, subject to technical specifications and production schedule
• Fast Delivery: Accelerated manufacturing and worldwide delivery solutions are available for qualified urgent projects