Customization of oil immersed transformers

　　Core Considerations and Recommended Solutions for Customizing Oil-Immersed Transformers

　　I. Customization Demand Analysis: Technical Adaptability is Key

　　1. Capacity and Voltage Levels

　　Small- to Medium-Scale Projects (e.g., commercial buildings, industrial parks):

　　Recommend customizing 10kV oil-immersed transformers with capacities ranging from 100kVA to 1,600kVA. For instance, Jiangsu Hong’an’s SCBH15 amorphous alloy dry-type transformer (though dry-type, its amorphous alloy technology is equally applicable to oil-immersed customization) reduces no-load losses by 70%-80%, ideal for energy-efficient applications.

　　Large-Scale Industrial or Grid Projects:

　　Require customization of 2,000kVA or higher, even up to 10MVA-class, 35kV oil-immersed transformers. For example, TBEA’s SCB18 series can replace some oil-immersed models while supporting large-capacity demands.

　　2. Environmental Adaptability

　　High-Temperature/High-Humidity Environments:

　　Opt for open-type or specially designed heat-dissipation oil-immersed transformers, such as Beijing Heng’anyuan’s SGB11 open-type dry-type transformer (oil-immersed variants can adopt similar heat-dissipation structures), with a temperature resistance of up to 180°C, suitable for metallurgical and chemical industries.

　　Corrosive Environments:

　　Customize fully sealed, corrosion-resistant enclosures using stainless steel or specialized coatings to extend service life.

　　3. Energy Efficiency and Savings

　　Prioritize amorphous alloy cores or Grade 1 energy efficiency standard products, such as Goldwind Science & Technology’s JST-SCB14 amorphous alloy transformer, which cuts no-load losses by 60%, ideal for renewable energy sectors like photovoltaics and wind power.

　　II. Supplier Selection: Balancing Technical Expertise and Customization Capabilities

　　1. Industry-Leading Suppliers

　　TBEA:

　　Offers full-voltage-level oil-immersed transformer solutions, supports large-capacity customization up to 35kV, and maintains a nationwide service network, suitable for large-scale projects.

　　Goldwind Science & Technology:

　　A global core supplier in the renewable energy sector, leading in photovoltaic and wind power transformer market share, with products exported to Europe and the Americas and compliant with international IEC standards, ideal for export or high-standard projects.

　　2. Regionally Dominant Suppliers

　　Shandong Huaheng Transformer:

　　With an annual production capacity of 1.5 million KVA, supports customization across 6kV-35kV voltage levels and 30kVA-40,000kVA capacities, covering S11/S13/S20/S22 oil-immersed transformers and specialized models, suitable for regional bulk procurement.

　　Henan Taixin Electric:

　　Based in Pingdingshan, Henan, provides customization of S11/S13 series energy-efficient oil-immersed transformers and offers 24-hour on-site services, ideal for projects in Central China.

　　3. Specialized Transformer Suppliers

　　Jiangsu Juli Power:

　　Specializes in 35kV-class oil-immersed transformers, supports customization with amorphous alloy cores (e.g., SH15 amorphous alloy transformer), suitable for energy-saving retrofits.

　　Qingdao Qingdian Electric:

　　Provides sealed oil-immersed transformers and supports large-scale customization, such as the S11-2,000kVA model, ideal for power plants and substations.

　　III. Customization Process and Key Considerations

　　1. Demand Communication

　　Clearly define core parameters like capacity, voltage level, environmental conditions, and energy efficiency requirements. Provide project blueprints or site photos to facilitate supplier design.

　　Confirm requirements for special features, such as smart monitoring, remote control, or explosion-proof design.

　　2. Technical Proposal Validation

　　Require suppliers to submit detailed technical proposals covering core materials, winding structures, cooling methods, and insulation grades.

　　Compare multiple proposals and prioritize products certified by KEMA, CUL, or other international standards to avoid grid connection failures due to missing certifications.

　　3. Cost and Delivery Timelines

　　Bulk Purchases: Negotiate pricing with mid-sized suppliers like Zhejiang Zhiduoxin and Shandong Jinshida. Quotes for 10kV/630kVA transformers can be 15% below industry averages.

　　Urgent Deliveries: Select East China-based suppliers (e.g., Shanghai Chuanyong, Yueqing Zhengbei) for short logistics radii and 48-hour emergency delivery.

　　Framework Agreements: Sign annual agreements with suppliers like Shunte and Goldwind to hedge against price volatility.

　　4. After-Sales Support

　　Verify if suppliers offer full lifecycle services, such as transformer condition monitoring systems and remote fault diagnostics.

　　Require suppliers to maintain regional warehouses nationwide to ensure ≤24-hour replacement cycles for critical components (e.g., temperature controllers, fans).

　　IV. Risk Mitigation and Optimization Strategies

　　1. Low-Cost Traps

　　Avoid suppliers cutting costs by reducing silicon steel sheet thickness or downgrading insulation, which can result in >20% higher no-load losses.

　　Demand type test reports to verify key specifications.

　　2. Service Gaps

　　Small suppliers may lack high-voltage testing equipment, leading to 15–30-day factory return cycles for repairs.

　　Prioritize suppliers with complete testing capabilities, such as Henan Taixin Electric, which operates two oil-immersed transformer production lines with comprehensive testing facilities.

　　3. Trade-In Programs

　　Leverage supplier recycling policies to dispose of outdated equipment, with some manufacturers offering 10%-15% subsidies for replacements, reducing upgrade costs.