Market Demand for 33kV Oil-Immersed Transformers in France’s Wind Power Industry: Opportunities Driven by Renewable Energy Development and Grid Upgrades

Writer： Hengfeng you electric Time：2026-10-15 views：times

Ⅰ. Wind Power Development in France and Transformer Procurement Demand

France continues to promote renewable energy development. Onshore wind farms, offshore wind projects, and power grid upgrades are important sources of demand for electrical equipment. As new renewable energy projects advance and existing facilities undergo upgrades, demand for transformers, switchgear, protection equipment, and substation components is also attracting attention.

Power transmission within a wind farm generally involves several stages, including electricity generation, internal power collection, voltage step-up, and grid connection. Electricity generated by wind turbines is stepped up through turbine transformers and collected through medium-voltage circuits. It is then stepped up further at a substation before being connected to the public power grid.

A 33kV system can serve as the internal collector voltage level for certain wind farm projects. Its suitability depends on the turbine configuration, collector circuit design, total project capacity, and grid connection scheme.

It is important to note that not all wind power projects in France use 33kV systems. Other medium-voltage levels may also be adopted, while grid connection schemes may involve high-voltage levels such as 225kV. Transformer procurement decisions should therefore be based on the project's electrical design and grid connection requirements rather than assumptions about standard configurations across the country or industry.

In addition to new wind farm construction, equipment replacement at existing wind farms, improvements in grid capacity, and the integration of wind power with energy storage systems may also create procurement opportunities for transformers and related distribution equipment.

For equipment suppliers, competition in the French market depends on more than product pricing. Technical compatibility, compliance with applicable standards, complete documentation, delivery capabilities, and after-sales technical support are also important considerations.

Ⅱ. Applications and Key Selection Considerations for 33kV Oil-Immersed Transformers

Wind farms operate primarily in outdoor environments and must accommodate variations in load, climate, and on-site maintenance conditions. Compared with conventional distribution applications, wind power projects place greater emphasis on operational reliability under actual working conditions and compatibility with the overall collector system.

1. Matching Rated Capacity and Electrical Parameters

Transformer capacity should be determined according to individual wind turbine ratings, the number of collector circuits, total installed project capacity, and load characteristics.

Key parameters to confirm include the rated voltages of the high-voltage and low-voltage sides, frequency, vector group, impedance voltage, and tap-changing arrangement. These parameters should also be checked against the system short-circuit level and protection configuration.

For projects involving fluctuating loads, temperature rise, cooling capacity, and permissible overload requirements should be evaluated according to actual operating conditions. Selecting a transformer based solely on its rated capacity may not adequately address the project's operational needs.

2. Adapting to Climate Conditions in Different Regions of France

Operating conditions vary across coastal, inland, and southern regions of France. For coastal installations, particular attention should be paid to salt spray, humidity, and corrosion protection for metal components.

In regions with cold winters, buyers should verify the minimum ambient temperature, sealing performance, and suitability of the insulating oil for the specified operating conditions. In areas experiencing high summer temperatures, cooling performance and temperature-rise limits require careful evaluation.

For outdoor oil-immersed transformers, suitable enclosure arrangements, corrosion protection systems, temperature monitoring, and pressure-relief devices should be considered according to project specifications.

The required protection level and coating system should be determined by the installation environment and technical requirements rather than applying the same configuration to every project.

3. Operational Monitoring and Maintenance Accessibility

Wind farms are often spread across large areas, and some equipment may be installed in remote locations where maintenance is costly. During procurement, buyers should consider monitoring requirements for oil temperature, winding temperature, oil level, and other operating parameters.

Where integration with a Supervisory Control and Data Acquisition (SCADA) system is required, the monitoring points, communication interfaces, alarm signals, and data transmission requirements should be confirmed in advance. This helps reduce the likelihood of modifications after equipment delivery.

Ⅲ. European Standards and Compliance Requirements for Projects in France

Transformer suppliers entering the French market need to consider applicable EU legislation, relevant EN and IEC standards, and the technical requirements specified by project owners and grid operators.

The IEC 60076 series provides important standards for power transformer design, performance, and testing. The applicable parts of the series and corresponding test requirements should be identified according to the equipment type, intended application, and project technical specifications.

The fact that a transformer is intended for a wind farm does not automatically mean that it must comply with a particular wind power transformer standard. The applicable requirements should be verified against the product classification and project specifications.

CE marking must also be assessed according to the EU legislation applicable to the specific product. A test report alone does not automatically establish CE compliance for every transformer. Manufacturers should identify the applicable legislation, determine the appropriate conformity assessment procedures, and prepare the required technical documentation before completing the relevant compliance process.

Similarly, the applicability of RoHS requirements, including any relevant exemptions, should be verified according to the product category and the scope of the applicable legislation. RoHS should not be treated as a universal market-entry requirement for all power transformers without further assessment.

During project execution, buyers may also request the following documents:

• Product technical datasheets, general arrangement drawings, and wiring diagrams;

• Applicable standards and relevant test reports;

• Factory routine test reports and documentation for agreed witness tests;

• Installation, operation, and maintenance manuals;

• Spare parts lists and quality assurance documentation.

For projects connecting to the French public power grid, the relevant requirements and approval procedures specified by the applicable grid operator should also be confirmed according to the connection voltage and project conditions.

Clarifying the documentation checklist and acceptance criteria at an early stage can help reduce communication costs during design approval, equipment inspection, and project delivery.

Ⅳ. Transformer Procurement Trends and Key Supplier Evaluation Criteria

Transformer procurement for French wind power projects generally requires coordination across technical performance, cost, delivery, and long-term operation. For EPC contractors and renewable energy project developers, purchasing decisions should consider more than the initial quotation. Equipment losses, maintenance requirements, spare parts availability, and lifecycle operating costs should also be evaluated.

From a technical perspective, suppliers should confirm key parameters according to project requirements, including rated capacity, voltage levels, cooling methods, insulation levels, and protection arrangements. They should also provide appropriate design recommendations for specific operating environments, such as coastal corrosion, high temperatures, or low temperatures.

In terms of quality management, complete production inspection records, factory test reports, and arrangements for any required witness tests help buyers verify product quality. For large or customized equipment, both parties should also confirm the technical document approval process, production schedule, inspection milestones, and transportation requirements in advance.

Regarding delivery and service, suppliers should clarify packaging and transportation conditions, lead times, installation and commissioning support, and after-sales response arrangements.

If a project involves the procurement of transformers, switchgear, and other associated equipment, coordinating equipment interfaces and technical documentation can also help reduce the management burden associated with working with multiple suppliers.

Chinese transformer manufacturers can participate in the European market by offering flexible customization, manufacturing capabilities, and project coordination services. However, their competitiveness in France ultimately depends on product quality, compliance capabilities, project experience, and contract performance rather than price advantages alone.

Ⅴ. Hengfengyou Electric: Transformer and Power Distribution Equipment Supply for European Projects

Wind power development and grid modernization projects in France place comprehensive demands on equipment compatibility, quality verification, and delivery coordination. For buyers evaluating suppliers or preparing project designs, confirming equipment parameters, applicable standards, documentation requirements, and delivery schedules at an early stage can improve procurement efficiency.

Qingdao Hengfengyou Electric Engineering Co., Ltd. specializes in the export of power transmission and distribution equipment. Its product portfolio includes power transformers, distribution transformers, and supporting switchgear.

For projects in France and other European markets, Hengfengyou Electric can work with customers to confirm product parameters, discuss customized designs, conduct factory testing, and prepare relevant technical documentation based on the technical specifications and application requirements provided.

For French wind farms and renewable energy infrastructure projects, buyers are encouraged to provide the following information when requesting a quotation:

• Rated transformer capacity;

• Rated voltage and voltage ratio;

• Installation environment and operating conditions;

• System connection scheme;

• Applicable standards and project specifications;

• Required documentation and delivery schedule.

Providing these details enables suppliers to evaluate the proposed equipment configuration more accurately and determine its suitability for the project.

For inquiries about 33kV oil-immersed transformers and related power transmission and distribution equipment, please contact Hengfengyou Electric:

Email: perona@hengfengyou.com

As France continues to develop wind power capacity and upgrade its electricity infrastructure, suppliers capable of combining technical compatibility, quality control, regulatory compliance, and reliable project delivery will be better positioned to participate in renewable energy projects in France and across Western Europe.