1. Product Overview
The 35kV 3500 kVA Three Phase Oil-Filled Power Transformer for Distribution Substation is a high-performance electrical equipment solution engineered for reliable medium-voltage power distribution in utility grids, industrial substations, and EPC power projects. Designed and manufactured by Evernew Transformer, a professional power transformer manufacturer and factory in China, this transformer is optimized to meet the stringent operational, safety, and efficiency requirements of modern power systems across Europe, North America, Africa, the Middle East, and Southeast Asia.
As global demand for stable and efficient electrical infrastructure continues to grow, distribution substations play a critical role in ensuring safe voltage transformation and continuous power supply. The 35kV 3500 kVA oil-filled power transformer is specifically developed for distribution substations, where durability, long service life, and consistent electrical performance are essential. Evernew Transformer integrates advanced manufacturing technology, strict quality control systems, and internationally recognized standards to deliver a transformer that performs reliably under diverse environmental and load conditions.
This product supports three-phase power systems, offering excellent voltage regulation, low losses, and strong short-circuit withstand capability. The oil-filled insulation and cooling system ensures superior thermal performance, enabling the transformer to operate continuously under rated load while maintaining optimal internal temperature control.
Evernew Transformer offers this model as part of a comprehensive capacity range from 100 kVA to 5000 kVA and a voltage range up to 35kV, with full customization options available to meet project-specific requirements. Whether supplied for wholesale distribution, EPC turnkey projects, or utility grid expansion, this transformer delivers dependable performance and long-term value.
2. Technical Specification Table
| Parameter | Spezifikation |
| Produktname | Oil-Filled Power Transformer |
| Anmeldung | Distribution Substation |
| Nennkapazität | 3500 kVA |
| Kapazität Bereich | 100 kVA – 5000 kVA (customizable) |
| Rated Voltage (HV) | 35 kV |
| Spannungsbereich | Up to 35 kV |
| Rated Voltage (LV) | Customized (e.g. 10.5 kV / 11 kV / 6.3 kV) |
| Number of Phases | Dreiphasig |
| Frequenz | 50 Hz / 60 Hz |
| Methode der Kühlung | ONAN / ONAF (optional) |
| Insulation Medium | Mineral Oil (IEC compliant) |
| Vektor-Gruppe | Dyn11 / Yyn0 / Customized |
| Impedanz | Customized (typically 6%–10%) |
| Temperaturanstieg | Oil ≤ 60K, Winding ≤ 65K |
| Isolationsniveau | According to IEC standards |
| Wirkungsgrad | High efficiency, low no-load and load losses |
| Normen | IEC 60076 / ANSI / IEEE (optional) |
| Einrichtung | Outdoor / Indoor Substation |
| Temperatur in der Umgebung | -25°C to +40°C (customizable) |
| Höhenlage | ≤1000 m (higher altitude design available) |
| Schutzklasse | Kundenspezifisch |
| Zubehör | Conservator, Buchholz Relay, Oil Level Indicator, Temperature Indicators |
| Manufacturing Origin | China |
| Marke | Evernew-Transformator |
| Supply Type | Factory Direct / Wholesale / Custom Manufacturing |
3. Design Philosophy and Engineering Excellence
The design philosophy behind the 35kV 3500 kVA oil-filled power transformer focuses on operational reliability, electrical efficiency, and long-term durability. Evernew Transformer applies a rigorous engineering approach that combines electrical simulation, thermal analysis, and mechanical strength verification to ensure the transformer performs consistently throughout its service life.
The transformer core is manufactured using high-grade cold-rolled grain-oriented silicon steel, minimizing hysteresis and eddy current losses. Precision core stacking and advanced cutting technology significantly reduce no-load losses and noise levels, making the transformer suitable for both urban and industrial substations.
The windings are constructed using high-purity copper or aluminum conductors, depending on customer preference, and are carefully insulated to withstand electrical and thermal stresses. Vacuum pressure impregnation and controlled drying processes enhance insulation strength and ensure long-term stability.
The oil-filled insulation system not only provides excellent dielectric properties but also acts as an efficient cooling medium. Combined with a well-designed tank structure and radiator arrangement, the transformer maintains stable operating temperatures even under heavy load conditions.
Learn More：3000 Kva Three Phase Substation Transformer
4. Oil-Filled Cooling and Insulation System
The oil-filled design is a proven and widely adopted solution for medium- and high-voltage power transformers. In this 35kV distribution substation transformer, the insulating oil performs two critical functions: electrical insulation and heat dissipation.
During operation, heat generated by the core and windings is transferred to the oil, which circulates naturally through the radiators in ONAN mode. For applications requiring higher load capacity, ONAF cooling can be provided to enhance heat dissipation.
Evernew Transformer uses high-quality transformer oil that complies with IEC standards, ensuring excellent dielectric strength, oxidation stability, and thermal performance. The sealed or conservator-type tank design protects the oil from moisture and contamination, extending oil life and reducing maintenance requirements.
Read More：2500 KVA Three Phase Pad Mounted Transformer
5. Performance Advantages for Distribution Substations
Distribution substations demand transformers that can operate reliably under fluctuating load conditions while maintaining voltage stability. The 35kV 3500 kVA oil-filled power transformer offers several performance advantages:
Stable voltage transformation under variable load
Low losses for improved energy efficiency
High short-circuit withstand capability
Excellent thermal performance for continuous operation
Long service life with minimal maintenance
These advantages make the transformer ideal for utility substations, industrial power distribution systems, renewable energy integration, and EPC power projects.
6. Manufacturing Capability and Factory Strength
Evernew Transformer is a professional power transformer manufacturer and factory in China, with advanced production facilities, experienced engineering teams, and strict quality management systems. The factory is equipped with automated winding machines, vacuum drying systems, core cutting lines, and comprehensive testing laboratories.
Each transformer undergoes rigorous factory testing, including routine tests and type tests, to ensure full compliance with IEC standards and customer specifications. Factory-direct manufacturing allows Evernew Transformer to offer competitive wholesale pricing, flexible lead times, and reliable quality control.
7. Customization and OEM / ODM Services
One of the key advantages of working with Evernew Transformer is the ability to provide customized power transformer solutions. Customers can specify:
Voltage ratios and capacity
Vektorgruppe und Impedanz
Cooling method and accessories
Insulation level and environmental conditions
Standards (IEC / ANSI / IEEE)
OEM and ODM services are available for distributors, EPC contractors, and utility companies seeking tailored transformer solutions for specific projects or markets.
8. Applications and Use Scenarios
The 35kV 3500 kVA three phase oil-filled power transformer is widely used in:
Utility distribution substations
Industrial plants and manufacturing facilities
Mining and heavy industry power systems
Renewable energy substations
EPC and turnkey power projects
Overseas power infrastructure development
Its robust design and flexible configuration make it suitable for both indoor and outdoor substation installations.
9. Quality Assurance and Standards Compliance
Quality and safety are core priorities at Evernew Transformer. All products are designed and manufactured in accordance with IEC 60076 and relevant international standards. Optional compliance with ANSI and IEEE standards is also available for North American and international projects.
Each transformer is subjected to comprehensive testing, including insulation resistance, ratio testing, impedance measurement, and temperature rise verification. This ensures reliable operation and full traceability throughout the product lifecycle.
10. Wholesale Supply and Global Export Capability
Evernew Transformer supports wholesale supply and global export of power transformers. With extensive experience serving international markets, the company provides professional packaging, documentation, and logistics solutions to ensure safe and timely delivery.
The 35kV 3500 kVA oil-filled power transformer is export-ready and widely supplied to customers in Europe, Africa, the Middle East, Southeast Asia, and South America.
Learn More：Power Line Transformers: 2025 Comprehensive Technical & Buyer’s Guide
11. After-Sales Support and Technical Service
Evernew Transformer offers comprehensive after-sales support, including installation guidance, operation manuals, and technical consultation. Long-term cooperation and customer satisfaction are central to the company’s service philosophy.
12. Why Choose Evernew Transformer
Professional power transformer manufacturer and factory
Competitive wholesale pricing
Custom design and OEM / ODM capability
IEC-compliant quality assurance
Proven experience in global power projects
13. Schlussfolgerung
Die 35kV 3500 kVA Three Phase Oil-Filled Power Transformer for Distribution Substation by Evernew Transformer is a reliable, efficient, and cost-effective solution for modern power distribution needs. With advanced design, robust manufacturing quality, and flexible customization options, it is an ideal choice for utilities, industrial users, EPC contractors, and global power infrastructure projects.
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