Product Overview
The oil-immersed rectifier transformer is a core specialized device for industrial DC power supply systems. It is suitable for three-phase AC 50Hz power transmission and distribution systems. Its core function is to provide stable AC power to rectifiers, cooperating with rectifier devices to convert AC power to DC power. Widely used in industries such as metallurgy, chemicals, electrochemistry, locomotive traction, electroplating/electrolysis, new energy charging, and DC drives. It undertakes functions including voltage transformation, rectifier power supply, harmonic suppression, and stable output. It is key equipment for DC power supply in industrial production, suitable for medium to large-scale DC load scenarios, balancing power supply stability, impact resistance, and energy efficiency, meeting the needs for efficient and green industrial development.
The product adopts a fully sealed oil-immersed structure (non-sealed optional). The core uses 30q130 high-permeability cold-rolled grain-oriented silicon steel sheets, employing a 3～6 step multi-stage lamination method to effectively reduce no-load loss and noise. The windings use high-strength oxygen-free copper conductors (copper flat wire, transposed conductor optional), paired with PCB-free environmentally friendly insulating oil and vacuum oil filling process. Designed and optimized for rectifier loads characterized by significant harmonics and large surges, it features low loss, strong short-circuit withstand capability, good thermal stability, excellent overload performance, and stable operation. Complies with national standards and industry specifications such as GB 1094, GB 20052-2024, and JB/T 8636-2018, has passed CCC and ISO certifications. The quality is reliable, technology mature, and cost-performance outstanding, adaptable to different rectifier circuits and demanding industrial conditions.
Operating Environment
1. Ambient temperature: -25℃～+40℃, 24h average ≤ +35℃; anti-freeze insulating oil and heating devices can be customized for low temperatures to ensure oil fluidity and equipment startup, suitable for high-temperature production scenarios like metallurgy/chemicals and severely cold regions.
2. Altitude: ≤1000m; customizable up to 3000m under special conditions. Optimized insulation structure for high-altitude adaptation, complying with insulation requirements of GB/T 1094.3-2017, avoiding the impact of high altitude on insulation performance, ensuring stable equipment operation.
3. Relative humidity: Daily average ≤ 95%, monthly average ≤ 90%; anti-condensation devices can be provided for humid environments to ensure insulation stability and avoid insulation aging, suitable for high-humidity industrial scenarios like electroplating and electrolysis.
4. Installation site: No violent vibration, corrosive gases, flammable/explosive dust, or conductive dust; keep away from strong electromagnetic interference. Adaptable to C3-C5 corrosive environments (upgradable to C5-M salt spray level), meeting the stringent requirements of metallurgical plants, chemical workshops, and electroplating workshops.
5. Outdoor units withstand rain, snow, sand, dust, and salt spray erosion, equipped with rain, dust, and corrosion protection enclosures and "three-proof paint" coating, with seals made of fluoroelastomer. Indoor units require good ventilation, no standing water, and should be kept away from high-temperature heat sources, suitable for centralized installation in workshop switchgear rooms.
6. Installation inclination: ≤3° relative to the vertical plane. The core and tank are firmly secured, using a rigid plate buffer structure to overcome the "core suspension" phenomenon, ensuring equipment stability and even oil distribution, guaranteeing heat dissipation and insulation performance, avoiding displacement during transport and operation.
Technical Parameters
Item | Unit | Parameters |
|---|---|---|
Rated Voltage | kV | 10/0.4, 35/0.4 (customizable, supports on-load/off-load tap changing, adaptable to rectifier circuit requirements) |
Rated Capacity | kVA | 100, 160, 200～12500 (full series, larger capacities customizable, suitable for ZSG, ZS series) |
Connection Symbol | --- | Dyn11, Yd11 (common), connection mode customisable according to rectifier circuit |
Cooling Method | --- | ONAN (Oil Natural Air Natural), ONAF (customizable), OFAF (Forced Oil Forced Air - customizable for high-load scenarios) |
Insulation Level | kV | Power frequency withstand voltage 65～100kV/1min; induced withstand voltage 130～195kV (10s), environmental safety factor ≥1.67, complies with GB/T 1094.3-2017 |
Impedance Voltage | % | 8.0%, 10.0%, 12.0% (30% higher than power transformers of the same capacity to suppress di/dt and protect rectifier components) |
Noise Level | dB | ≤65～78 (standard), low-noise type customizable to ≤58dB, significant noise reduction effect with optimized core structure |
Protection Grade | --- | Indoor IP20; Outdoor IP33, IP54, IP65 (WF2 corrosion protection grade customizable, suitable for salt spray, high-corrosion environments) |
Insulating Oil | --- | 25# environmentally friendly transformer oil (45# low-temperature type, anti-aging type customizable, PCB-free, suitable for high-temperature conditions) |
Product Features
1. High Efficiency, Low Loss, Significant Energy Savings: Uses high-permeability silicon steel sheets and multi-stage stepped lamination. Optimized winding arrangement using oxygen-free copper conductors results in no-load loss and current lower than industry averages, meeting national Tier 1/Tier 2 energy efficiency standards, providing obvious power savings, significantly reducing industrial electricity costs over long-term operation.
2. Stable Electrical Performance, Strong Impact Resistance: Designed for loads characterized by significant harmonics and large surges. Optimized insulation structure and impedance design, with impedance 30% higher than power transformers of the same capacity, effectively suppressing di/dt and protecting rectifier components. Windings use integral assembly process, reinforced end insulation, providing outstanding short-circuit and surge withstand capability, high dynamic stability.
3. Good Thermal Stability, Excellent Overload Capacity: Tightly controls temperature rise at heating parts and hotspots. Temperature rise is at least 5℃ lower than national standards. Axial oil ducts can be added inside coils to optimize heat dissipation. Supports long-term full-load operation at 110% overvoltage, withstands 1.5 times rated current for 5 seconds, suitable for industrial load fluctuation scenarios.
4. Robust Structure, Comprehensive Protection: Tank made of high-quality cold-rolled steel plate with anti-leakage design. Surface coated with "three-proof paint". Good sealing and vibration resistance. Core insulation spacers use high-strength laminated wood and laminated paperboard, with end support area exceeding 95%. Outdoor units suitable for salt spray and industrial corrosive environments.
5. Strong Adaptability, Flexible Customization: Can be customized for different rectifier circuits such as single-phase half-wave, three-phase bridge, double-star with interphase reactor. The valve side can use same-phase reverse parallel outlet mode. DC current can reach 25kA, suitable for DC power supply needs in different industries like metallurgy, chemicals, electroplating.
6.Maintenance-Free, Long Service Life: Fully sealed structure reduces insulating oil oxidation, resulting in low maintenance frequency. Service life ≥ 25 years under normal maintenance conditions. Tank anti-leakage design prevents oil leakage hazards. Environmentally friendly insulating oil complies with industry standards, reducing environmental impact and operational costs.
Our Advantages
1. Strong Customization Capability: Capacity, voltage, connection symbol, impedance voltage, and rectifier circuit adaptation schemes can be customized. Suitable for special conditions such as high altitude, low temperature, high corrosion. Dedicated modules like on-load tap-changing and harmonic suppression can be customized, meeting DC power supply needs in different industries.
2. Standardized Production & Strict Quality Control: Standardized production with quality control throughout the entire process and multiple inspections including insulation performance, oil quality tests, short-circuit impedance tests, and 72-hour full-load aging tests, complying with standards like GB/T 6451-2023. A complete factory test report is provided for each unit, ensuring consistent product performance.
3. Complete Qualifications: Possesses CCC, ISO certifications, and type test reports, complying with industry specifications like JB/T 8636-2018, meeting industrial project acceptance requirements without needing additional qualification documents, facilitating rapid project implementation.
4. Stable Delivery & Comprehensive Support: Stable delivery times, supporting expedited orders. Provides professional transportation, on-site installation guidance, and commissioning services. Offers technical support for coordinated operation of rectifier transformers and rectifier devices, ensuring continuity of industrial production power supply.
5. Complete After-Sales Service: Provides full lifecycle support including technical training, regular inspections, emergency fault handling, oil testing and replacement. Localized teams improve response efficiency, ensuring stable equipment operation throughout its life, reducing the risk of industrial production shutdowns.
Ordering Guide
Please provide the following information when ordering to ensure accurate product matching for rectifier power supply needs:
1. Specify rated capacity, input/output voltage, frequency, connection symbol, and tap-changing method (on-load/off-load). Determine the rectifier circuit type (e.g., three-phase bridge, double-star with interphase reactor) to match DC power supply requirements.
2. Describe the operating environment (indoor/outdoor, altitude, temperature, humidity, etc.) and special requirements such as corrosion protection, anti-freezing, salt spray protection, suitable for severe conditions in different industrial scenarios like metallurgy, chemicals, electroplating.
3. Determine the cooling method, insulating oil type, impedance voltage, and energy efficiency level to match actual load conditions. Specify whether special performance like low noise or high impedance is required.
4. Provide installation method, cable entry/exit method, and workshop switchgear room layout requirements to optimize the installation plan. Specify the valve side outlet mode (e.g., whether same-phase reverse parallel is needed).
5. Specify special functional requirements such as tap-changers, temperature measurement devices, harmonic suppression, intelligent monitoring, etc., to meet individual usage needs and smart, unattended industrial production scenarios.
