35kv 200kva 300kva Toroidal 50/60hz Three-phase Oil-immersed Power Transformer

1. Product Description

The 35kv 200kva 300kva Toroidal 50/60hz Three-phase Oil-immersed Power Transformer is a high-stability medium-voltage power transformation device built with advanced toroidal core technology, specially designed for 35kV high-voltage power distribution systems. Covering two mainstream rated capacities of 200kVA and 300kVA, this three-phase oil-immersed power transformer supports both 50Hz and 60Hz grid frequency operation, making it highly adaptable for global industrial power distribution, utility grid projects and renewable energy power conversion scenarios.

Different from traditional laminated core transformers, this medium-voltage oil immersed transformer adopts an integrated closed toroidal core structure, which effectively eliminates magnetic flux leakage and reduces no-load loss significantly. The whole machine is manufactured in strict accordance with IEC 60076 international power transformer standards, with high-purity copper three-phase windings uniformly wound around the toroidal core for balanced electromagnetic conversion. Filled with high-performance insulating mineral oil, the equipment achieves excellent insulation strength and continuous circulating heat dissipation, supporting stable long-term full-load operation under 35kV high-voltage working conditions.

Featuring a fully sealed anti-corrosion steel tank design, this 35kV three-phase power transformer avoids moisture intrusion, dust accumulation and insulating oil oxidation during outdoor and indoor operation. The universal 50/60Hz frequency design allows seamless deployment in European, Asian, African and American power grids without additional parameter modification. Available in 200kVA and 300kVA compact capacity specifications, this toroidal core oil-immersed transformer delivers higher efficiency, lower noise and better operational stability than conventional transformers of the same grade, serving as an upgraded solution for medium-voltage power distribution systems.

2. Product Features

2.1 Advanced Toroidal Core Structure & Ultra-Low Magnetic Loss

This 35kV three-phase oil-immersed power transformer adopts a premium toroidal core design, which features a complete closed magnetic circuit with no air gap. Compared with traditional stacked silicon steel cores, the toroidal structure greatly suppresses magnetic flux leakage, minimizes no-load current and cuts down overall power loss. Whether running at 200kVA light load or 300kVA full load, the equipment maintains high electromagnetic conversion efficiency, realizing outstanding energy-saving effects for long-term grid operation and industrial power supply.

2.2 Dual 50/60Hz Frequency Compatibility & Stable Global Adaptability

Engineered with universal grid frequency adaptability, this toroidal oil immersed transformer works stably on both 50Hz and 60Hz power systems. It can be directly applied to most national and regional medium-voltage power grids without structural adjustment or electrical modification. The consistent voltage regulation performance and frequency response capability ensure stable 35kV voltage conversion output in different climatic and grid environments, effectively solving the frequency mismatch problem of ordinary medium-voltage transformers in cross-border engineering projects.

2.3 Balanced Three-Phase Output & Low Operating Noise

Thanks to the uniform winding layout of the toroidal core, this three-phase power transformer achieves extremely balanced three-phase voltage and current output, avoiding phase deviation and unbalanced load operation that commonly occur in traditional transformers. The integrated core structure reduces mechanical vibration and electromagnetic noise during operation, enabling low-noise power conversion that meets environmental protection standards. It is suitable for both indoor substation rooms and outdoor unattended substation environments without causing noise pollution to surrounding areas.

2.4 Reliable Oil-Immersed Insulation & Long Service Life

Equipped with high-purity anti-aging insulating oil and professional oil-paper composite insulation system, this 35kV medium-voltage transformer has excellent high-voltage insulation and arc resistance performance. The fully sealed tank structure prevents external humid air and corrosive gas from entering the interior, delaying insulation aging and oil deterioration. Adopting standard ONAN natural oil circulation cooling mode, the equipment realizes passive heat dissipation with low temperature rise, supporting 24-hour continuous operation. With stable mechanical and electrical performance, the service life can reach more than 30 years with routine simple maintenance.

3. Core Purpose

The core purpose of the 35kv 200kva 300kva Toroidal 50/60hz Three-phase Oil-immersed Power Transformer is to implement efficient, safe and stable medium-voltage power conversion and power distribution for 35kV level power systems. It mainly completes step-down voltage conversion from 35kV high voltage to conventional low-voltage power supply, providing standardized and balanced three-phase power for industrial equipment, municipal power grids and public power facilities.

With unique toroidal core energy-saving advantages and dual-frequency adaptability, this oil immersed power transformer optimizes power quality, stabilizes grid voltage and reduces transmission loss in medium-voltage power distribution networks. The 200kVA model targets light and stable load scenarios, while the 300kVA capacity meets medium-load power consumption and peak load demands. It effectively solves the problems of high loss, unbalanced phase voltage and poor frequency adaptability of traditional transformers, ensuring reliable and high-efficiency power supply for medium-voltage power distribution projects.

4. Application Scenarios

4.1 Municipal Medium-Voltage Power Grid Construction

This 35kV toroidal three-phase oil-immersed transformer is widely used in urban and rural 35kV power grid renovation, grassroots medium-voltage substations and regional power distribution stations. The 200kVA and 300kVA compact capacities are very suitable for township-level power supply, suburban grid supporting and residential cluster power distribution. Its low loss and stable operation effectively reduce municipal grid operating costs and improve terminal power supply quality.

4.2 Small and Medium Industrial Power Distribution

It is widely applied in small and medium-sized factories, light industrial parks and mining auxiliary power supply projects with 35kV grid access conditions. The balanced three-phase output ensures stable operation of production lines, mechanical equipment and electrical control systems. The dual 50/60Hz frequency design makes it adaptable for imported production lines and foreign-funded industrial projects, providing reliable medium-voltage power conversion support for industrial production.

4.3 New Energy Power Station Supporting Projects

Suitable for distributed solar power stations, small wind power plants and new energy micro-grid systems. This toroidal core oil immersed power transformer can stabilize fluctuating new energy power output, complete 35kV grid-connected voltage matching and optimize grid-connected power quality. Its strong environmental adaptability allows long-term outdoor operation in new energy stations, effectively improving the stability and efficiency of clean energy power transmission.

4.4 Overseas Engineering & Cross-Border Power Projects

Thanks to 50Hz and 60Hz dual-frequency universal design, this 35kV three-phase power transformer is the preferred equipment for overseas power engineering, international EPC projects and cross-regional power facility construction. It can adapt to different national grid standards without customized modification, greatly improving project implementation efficiency. The energy-saving and low-maintenance design also reduces long-term operation costs for overseas power distribution systems.

5. Frequently Asked Questions (FAQ)

Q1: What is the biggest advantage of toroidal core oil immersed transformers over traditional transformers?

Different from conventional laminated core transformers, this 35kV toroidal three-phase oil-immersed power transformer adopts a closed magnetic circuit structure with no air gap. It features extremely low magnetic flux leakage, much lower no-load loss and quieter operation. The three-phase winding is more uniform, ensuring balanced current and voltage output during operation. Compared with traditional transformers of the same 200kVA and 300kVA capacity, it has higher energy efficiency, more stable performance and stronger overload resistance, making it more suitable for long-term continuous medium-voltage power distribution.

Q2: What is the difference between 50Hz and 60Hz operation for this dual-frequency transformer?

This transformer is professionally designed for universal 50/60Hz operation with no need for structural changes or parameter replacement. Under 50Hz operating conditions, it perfectly matches most power grids in China, Europe, Asia and Africa; under 60Hz conditions, it adapts to American, Southeast Asian and Oceanian grid standards. Both frequency modes maintain consistent voltage conversion accuracy, low-loss performance and three-phase balance, fully meeting the deployment needs of global cross-border power projects.

Q3: How to choose between 200kVA and 300kVA capacity for practical projects?

The 200kVA toroidal oil immersed transformer is recommended for light-load and stable power supply scenarios, including township public power distribution, small new energy stations and auxiliary industrial power supply, offering higher cost performance. The 300kVA model is more suitable for medium-load scenarios with occasional peak power consumption, such as medium-sized industrial workshops, suburban central substations and commercial supporting power distribution. Choosing a reasonable capacity can avoid long-term overload operation and effectively extend the service life of the medium-voltage power transformer.