HENGFENGYOU ELECTRIC --SMART ELECTRIC GLOBAL SERVICE PROVIDER
The 66kV oil-immersed power transformer is designed for regional power transmission and distribution, industrial power supply, renewable energy integration and substation voltage conversion.
As an important voltage level between high-voltage transmission networks and medium-voltage distribution systems, 66kV is widely used in urban substations, industrial parks, mining areas, chemical plants, power plants, renewable energy projects and other high-demand power applications.
HENGFENGYOU provides 66kV three-phase oil-immersed transformers with capacity configurations covering approximately 3MVA to 63MVA, with voltage combinations and transformer structures customized according to project requirements.
Typical applications include 66kV/33kV, 66kV/11kV and other customized voltage conversion systems. Depending on the power system configuration, the transformer can be supplied as a double-winding transformer, three-winding transformer or autotransformer.
The product is designed to provide stable voltage conversion under continuous loading and changing operating conditions, making it suitable for both conventional power grids and renewable energy power collection systems.
Capacity Range: 3MVA–63MVA
Voltage Class: 66kV
Typical Voltage Levels: 63kV / 66kV / 69kV on the high-voltage side, with low-voltage configurations including 6.3kV, 6.6kV, 10.5kV and 11kV
Efficiency: More than 98% according to the available product information
Design Lifespan: More than 30 years under appropriate operating and maintenance conditions
Voltage Regulation: Off-circuit tap changer or on-load tap changer
Cooling: Selected according to capacity, load characteristics and installation environment
Insulating Oil: Conventional mineral insulating oil or FR3 environmentally friendly insulating oil according to project requirements
Delivery: Normal delivery approximately 90 days; shortest stated delivery cycle approximately 50 days
HENGFENGYOU has accumulated project experience in more than 50 countries and regions, supporting power grid transformation, renewable energy access and other power infrastructure projects.
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The 66kV voltage level is widely used in regional transmission and distribution systems and serves as an important connection between high-voltage networks and downstream medium-voltage loads.
HENGFENGYOU 66kV transformers can be configured for different power system structures, including:
This makes the 66kV oil-immersed transformer suitable for customers looking for a reliable solution between high-voltage transmission and medium-voltage distribution.
Different countries and regions use different distribution voltage levels. HENGFENGYOU therefore provides customized voltage combinations rather than limiting the product to a single fixed configuration.
The available high-voltage side configurations include:
63kV / 66kV / 69kV
Typical low-voltage configurations include:
6.3kV / 6.6kV / 10.5kV / 11kV
The final voltage ratio, tap range and electrical parameters can be designed according to the customer's grid requirements.
Different substation structures require different transformer configurations.
66kV Double-Winding Transformer
The double-winding transformer is suitable for direct voltage conversion between two voltage levels, such as 66kV/33kV or 66kV/11kV.
It is widely applicable to regional substations, industrial facilities and distribution systems.
66kV Three-Winding Transformer
The three-winding configuration can connect three voltage levels through one transformer and is suitable for substations with more complex power distribution structures.
66kV Autotransformer
An autotransformer can be considered for interconnection between relatively close voltage levels where its shared winding configuration is technically suitable.
The final transformer type is selected according to voltage ratio, capacity, insulation requirements and the overall power system design.
HENGFENGYOU provides different voltage regulation solutions according to the operating characteristics of the power system.
Off-Circuit Tap Changer
Suitable for applications where voltage adjustment can be performed after the transformer is de-energized.
The supplied technical configuration includes a typical ±2×2.5% tap arrangement for off-circuit voltage regulation.
On-Load Tap Changer
For power systems with frequent voltage fluctuations or changing load conditions, an OLTC solution can be selected.
The available technical configuration includes ±8×1.25% on-load voltage regulation.
The actual tap range and tap changer configuration are determined according to the customer's technical specification.
66kV transformers are increasingly used in applications where load conditions can change significantly.
Typical examples include:
For these applications, transformer capacity, impedance, cooling method and voltage regulation can be coordinated according to the project's load profile.
For renewable energy projects, on-load voltage regulation and appropriate monitoring systems can be considered where the grid requires more dynamic voltage control.
According to the available product information, the efficiency of the 66kV transformer can exceed 98%.
Optimized core and winding design helps control no-load and load losses during long-term operation.
For substations and industrial facilities operating continuously, reducing transformer losses can contribute to lower energy consumption and lifecycle operating costs.
66kV transformers can be engineered for different installation environments, including:
The final insulation system, cooling configuration, oil selection, enclosure protection and other design parameters can be adjusted according to the actual environmental conditions.
For projects with higher environmental requirements, HENGFENGYOU can provide FR3 environmentally friendly insulating oil and recyclable materials according to project specifications.
These options are suitable for customers seeking to reduce the environmental impact of electrical infrastructure while maintaining reliable transformer operation.
A 66kV transformer needs to be matched with the entire substation rather than selected only according to rated voltage.
HENGFENGYOU's engineering team can evaluate:
This project-oriented approach helps ensure that the transformer matches the electrical system and operating environment.
The available 66kV product range covers approximately 3MVA to 63MVA, providing options for different application scales.
Smaller capacities can be used for regional distribution and industrial power supply, while larger configurations are suitable for substations, large industrial loads and renewable energy collection systems.
The final rated capacity is selected according to the project's present load, expected load growth and power system requirements.
Short-circuit impedance is an important parameter when selecting a 66kV transformer because it affects voltage regulation and fault current characteristics.
The available product specification identifies a typical impedance range of approximately 8%–12%, with customization available according to load characteristics and system requirements.
For industrial areas or power systems with higher short-circuit levels, the impedance value should be coordinated with the system short-circuit calculation rather than selected independently.
Different capacities require different heat dissipation solutions.
For smaller-capacity transformers, ONAN cooling can provide a relatively simple and reliable configuration.
For medium- and larger-capacity applications, forced cooling such as OFAF can be considered when higher heat dissipation capability is required.
For specific high-capacity or high-temperature applications where a water cooling system is available, OFWF can also be considered.
The final cooling configuration is determined according to transformer capacity, load profile and ambient conditions.
Before delivery, HENGFENGYOU 66kV transformers can undergo factory testing according to applicable standards and customer technical requirements.
Depending on the project, testing may include:
The final inspection and testing scope is determined according to the applicable standard and customer specification.
HENGFENGYOU has accumulated experience in power infrastructure projects across more than 50 countries and regions.
The company's transformer products have been supplied for applications involving power grid transformation, industrial power supply and renewable energy integration.
This international project experience provides a practical basis for adapting transformer solutions to different grid standards, operating environments and project requirements.
The normal delivery period for the 66kV transformer is approximately 90 days, while the shortest stated delivery cycle is approximately 50 days.
Actual delivery time depends on the final technical specification, transformer capacity, customized components, production scheduling and testing requirements.
For urgent projects, delivery planning can be coordinated with the customer's construction and commissioning schedule.
The 66kV double-winding transformer is the most direct solution for two-voltage-level power conversion.
Typical configurations include:
The rated capacity, impedance, connection group, tap range and cooling system can be customized according to project requirements.
The three-winding configuration is suitable for substations requiring connection between three voltage levels.
It can reduce the need for multiple independent transformers in certain substation configurations and provide centralized voltage conversion.
Typical voltage combinations can be customized according to the customer's power system.
The 66kV autotransformer is suitable for applications where two voltage levels are relatively close and an autotransformer structure is technically appropriate.
Its shared winding configuration can provide a compact solution for specific grid interconnection applications.
The final selection requires consideration of voltage ratio, capacity, insulation requirements and short-circuit conditions.
66kV transformers can be used as main transformers in urban and regional substations, stepping down high-voltage power to 33kV, 11kV or other distribution voltage levels.
Industrial parks with concentrated electrical loads can use 66kV transformers as the main connection between the regional grid and internal medium-voltage distribution network.
Mining operations and heavy industrial facilities often have large and continuously changing loads. A customized 66kV transformer can provide stable high-voltage power supply for these applications.
Chemical plants and process industries require stable power supplies for continuous production systems. The transformer can be configured according to load characteristics, environmental conditions and required voltage levels.
66kV transformers can be used in renewable energy booster stations and collection systems to transfer generated electricity into the regional high-voltage grid.
66kV transformers can also be configured for high-voltage power supply systems serving rail transit and other large public infrastructure projects.
A 66kV power transformer is an electrical transformer with a rated high-voltage level of 66kV. It is mainly used for voltage step-up or step-down in regional power grids, industrial facilities, substations and renewable energy projects.
The available HENGFENGYOU product range covers approximately 3MVA to 63MVA.
The actual capacity should be selected according to the present load, future load growth, transformer operating conditions and power system requirements.
Typical high-voltage configurations include 63kV, 66kV and 69kV, while common low-voltage configurations include 6.3kV, 6.6kV, 10.5kV and 11kV.
Other voltage combinations can be customized according to the customer's power system.
An off-circuit tap changer is suitable when voltage adjustment does not need to be performed while the transformer is energized.
An on-load tap changer (OLTC) is more suitable for systems where voltage changes frequently and continuous voltage adjustment is required during operation.
The appropriate solution depends on the grid voltage stability requirements and load characteristics.
The cooling method depends mainly on transformer capacity, loading conditions and ambient temperature.
ONAN can be considered for smaller-capacity applications, while OFAF may be used for medium- and large-capacity transformers requiring greater heat dissipation.
For specific high-capacity applications, OFWF can also be considered.
Yes. 66kV transformers can be used in photovoltaic and wind power projects, particularly in booster substations and renewable energy collection systems.
For projects with significant power fluctuations, OLTC, temperature monitoring and other appropriate control or monitoring solutions can be considered according to the grid requirements.
The available technical specification indicates a typical range of approximately 8%–12%.
The final value should be coordinated with the system short-circuit capacity, voltage regulation requirements, parallel operation conditions and load characteristics.
Yes. The transformer design can be adapted to different ambient conditions.
For extreme-temperature projects, the engineering design can consider appropriate insulating oil, cooling capacity, material selection and temperature-rise requirements.
The actual ambient temperature range should be provided during the quotation stage.
HENGFENGYOU 66kV transformers can be designed according to GB, IEC, GOST, EN, NF and ANSI/IEEE standards.
The applicable standard should be confirmed according to the destination country, utility requirements and project technical specification.
The normal stated delivery period is approximately 90 days, while the shortest stated delivery cycle can reach approximately 50 days.
The actual delivery period depends on capacity, customization, component availability, production schedule and factory testing requirements.
The product is designed for a service life of more than 30 years under appropriate operating and maintenance conditions.
Actual service life depends on loading, insulation condition, operating temperature, environmental conditions and maintenance quality.
For an accurate 66kV transformer quotation, customers are recommended to provide:
With these details, HENGFENGYOU can prepare a project-specific technical proposal and commercial quotation.
To order a 66kV oil-immersed power transformer, please provide the required technical specifications and project information.
Main Electrical Parameters
Transformer Configuration
Operating Environment
Additional Requirements
Minimum Order Quantity: 1 set
Delivery: Normal delivery approximately 90 days; shortest stated delivery cycle approximately 50 days, subject to final technical specifications and production scheduling.
For a customized quotation, please send your capacity, voltage ratio, tap changer requirement, cooling method and applicable standard.
HENGFENGYOU's engineering team can provide a 66kV transformer solution for substations, industrial facilities, mining projects, renewable energy plants and regional power networks.
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+86 15853252696
Tel：+86-0532-68688801
Fax:+86-0532-87038801
Email: hfy@hengfengyou.com
Address: No.638,Zhongcheng Road, Chengyang District, Qingdao City，China
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