Product Overview
The rectifier transformer is a specialized power conversion device designed to supply power to rectifier systems in industrial applications. It converts AC power from the grid into the required voltage levels for rectification, providing stable and reliable DC power for electrochemical processes, electrolysis, traction systems, and other industrial applications. The transformer is engineered to handle the unique demands of rectifier loads including high harmonic content, asymmetric loading, and frequent overload conditions.
The product complies with IEC 60076, GB 1094, GB/T 18494, and relevant international and national standards, featuring advanced design with low losses, high efficiency, and excellent overload capacity. The transformer is available with multiple winding configurations including double-winding, three-winding, and multi-winding arrangements to meet diverse application requirements. The robust construction and high-quality materials ensure long-term reliable operation in harsh industrial environments.

Key Features
1. Specialized Design for Rectifier Applications
The transformer is specifically designed to supply power to rectifier systems with multiple secondary windings for series or parallel connection to meet various rectifier configurations. The design accommodates the unique load characteristics of rectifier systems including high harmonic currents, DC bias components, and cyclic overloads.
2. Multiple Winding Configurations
The transformer supports various winding configurations including double-winding, three-winding, and multi-winding arrangements. The secondary windings can be configured for series connection to increase output voltage or parallel connection to increase output current. Phase-shift windings are available for 6-pulse, 12-pulse, 18-pulse, or 24-pulse rectifier systems to reduce harmonic distortion.
3. High Overload Capacity
The transformer is designed with generous thermal margins to handle frequent overloads encountered in rectifier applications. The cooling system and insulation design are optimized for cyclic loading conditions, ensuring reliable operation under demanding industrial processes.
4. Strong Short-Circuit Withstand Capability
The dynamic analysis method is applied for mechanical force calculation under short-circuit conditions. The winding structure and clamping system are reinforced to withstand the severe short-circuit forces associated with rectifier systems. All fasteners are treated with special anti-loosening measures for long-term operational stability.
5. Low Loss and High Energy Efficiency
The core is made of high-quality cold-rolled grain-oriented silicon steel with advanced step-lap joint technology, significantly reducing no-load losses. The optimized winding design minimizes stray losses and eddy current losses, particularly under high harmonic content conditions.
6. Excellent Insulation and Dielectric Performance
The transformer uses high-quality mineral insulating oil in accordance with IEC 60296 standards, providing excellent electrical insulation and heat dissipation. The insulation system is designed with optimized clearances to handle the high transient voltages and harmonic overvoltages common in rectifier applications.
7. Robust Construction and Long Service Life
The transformer tank is constructed from high-strength steel plates with advanced welding and anti-corrosion treatment for enhanced durability. The sealed tank structure prevents oil contamination and slows insulation aging. The transformer is designed for continuous operation under harsh industrial conditions.
8. Comprehensive Monitoring and Protection
The transformer is equipped with oil temperature indicators, winding temperature indicators, pressure relief devices, Buchholz relays, and oil level indicators for comprehensive monitoring and protection. All instruments provide local indication and remote transmission capabilities for integration with plant monitoring and control systems.

Technical Specifications
Rated Power: 1MVA to 100MVA and above (customizable)
Primary Voltage: 6kV, 10kV, 10.5kV, 11kV, 20kV, 35kV, 66kV, 110kV, 220kV (customizable)
Secondary Voltage: 0.1kV to 2kV and above (customizable)
Connection Type: Dd, Dy, Yd, Yy, or specialized phase-shift connections (customizable)
Winding Configurations: Double-winding, three-winding, multi-winding (customizable)
Phase-Shift for Multi-Pulse Systems: 6-pulse, 12-pulse, 18-pulse, 24-pulse (customizable)
Short-Circuit Impedance: 6% to 12% (depending on capacity and configuration)
Frequency: 50Hz or 60Hz
Cooling Method: ONAN, ONAF, OFAF (customizable)
No-Load Losses: According to applicable energy efficiency standards
Load Losses: According to applicable energy efficiency standards (at 75°C, rated frequency)
No-Load Current: ≤ 0.5% to 1.5% (depending on capacity)
Insulating Medium: Mineral insulating oil in accordance with IEC 60296
Winding Material: High-quality electrolytic copper
Oil Temperature Rise: ≤ 55K to 60K (depending on design)
Winding Temperature Rise: ≤ 60K to 65K (depending on design)
Operating Temperature: -25°C to +45°C (customizable)
Altitude: Up to 1000m above sea level (customizable for higher altitudes)

Applications
The rectifier transformer is extensively used in electrochemical industries including chlor-alkali production, aluminum smelting, copper smelting, and electrolytic refining processes. It is also employed in electrolysis applications for hydrogen production and water treatment. Industrial electrodeposition processes including metal plating and surface treatment rely on this transformer for controlled DC power supply. The transformer is widely used in DC traction power supply for subways, light rail transit, trolleybus systems, and railway electrification. Industrial heating applications including electrode boilers and resistance heating utilize rectifier transformers. Large AC and DC motor drives including variable speed drives and rolling mill drives employ these transformers for power conversion. Hydrogen production via electrolysis, water treatment and desalination facilities, and electrolytic capacitor production also benefit from rectifier transformers.

Compliance Standards
IEC 60076 Power Transformers, GB 1094 Power Transformers, GB/T 18494 Convertor Transformers, IEC 61378 Convertor Transformers, IEC 60296 Mineral Insulating Oils for Transformers, and relevant local and international standards for converter transformers and rectifier applications.

Why Choose Us
Our rectifier transformers feature specialized design for rectifier applications with multiple winding configurations to meet various rectifier requirements. We offer phase-shift windings for 6-pulse, 12-pulse, 18-pulse, and 24-pulse rectifier systems to reduce harmonic distortion. The robust construction provides high overload capacity to handle the cyclic loads typical of industrial processes. We perform comprehensive quality control including core and winding assembly verification, dielectric withstand tests, temperature rise tests, and short-circuit impedance measurements before delivery. Customization options are available for capacity, voltage levels, winding configurations, phase-shift arrangements, and cooling methods to meet specific project requirements. Our engineering team provides professional technical support for system design, installation, and commissioning. Competitive pricing and efficient manufacturing processes ensure value for money. Comprehensive after-sales service includes installation guidance, commissioning assistance, spare parts supply, and technical support. Our rectifier transformers have been installed in numerous industrial projects worldwide with proven reliability and customer satisfaction.