| Core Overview | Uses insulating oil for heat dissipation and insulation. It is the most mature, reliable and widely used power distribution equipment in power grids. | Designed for specific industrial processes, special voltage/waveform requirements or extreme environments, not for standard power distribution. Core advantage is to achieve specialized electrical and physical characteristics that general transformers cannot provide. | Provide full-process customization from conceptual design to prototype manufacturing, serving as a problem-oriented engineering solution. |
| Rated Capacity | Common range: 30kVA to 20MVA or higher | Customized based on special application scenarios (e.g., small capacity for testing transformers, large capacity for electric furnace transformers) | Non-standard capacity customization can be carried out according to load calculation for both standard and special transformers |
| Voltage Class | Primary side: 10kV, 11kV, 35kV, etc.; Secondary side: 0.4kV, 6.3kV, etc. | Customized according to application scenarios (e.g., low voltage for electric furnace transformers, high voltage for testing transformers) | Supports voltage design conforming to any global standard, meeting the requirements of special input-output voltage ratio |
| Frequency | 50Hz or 60Hz | 50Hz/60Hz or special frequency for testing scenarios | Can be designed as 50/60Hz universal type or adapted to specific frequency requirements |
| Phase Number | Three-phase (mainstream), single-phase | Single-phase, three-phase or special phase combination based on application needs | Provides single-phase, three-phase or special phase combination transformers |
| Connection Group | Common groups such as Dyn11, Yyn0, YNd11, etc. | Customized according to special load characteristics | Any connection group can be customized according to system grounding mode, harmonic suppression and other requirements |
| Performance and Loss | Complies with IEC standards and provides different energy efficiency levels (e.g., S11, S13) | High short-circuit impedance for electric furnace transformers; pure waveform for testing transformers | Optimize design to achieve specific energy efficiency levels (e.g., meeting China's Level 1 energy efficiency) and pursue lower no-load and load losses |
| Winding Material | Electrolytic copper (mainstream) or electrical aluminum (lower cost) | High-conductivity electrolytic copper is preferred for special transformers | Optional according to performance and cost budget, and can specify conductor purity or special alloys |
| Core Material | High-quality cold-rolled grain-oriented silicon steel sheet | Amorphous alloy core for dry-type special transformers (e.g., dry-type amorphous alloy transformers) | Can be upgraded to high magnetic permeability silicon steel or amorphous alloy core, greatly reducing no-load loss |
| Cooling Method | Oil-immersed self-cooled (ONAN) is the most common | Compact cooling structure for traction transformers; efficient cooling for electric furnace transformers | Can customize enhanced cooling methods such as oil-immersed air-cooled (ONAF) and forced oil circulation air-cooled (OFAF) according to heat dissipation needs |
| Tank Structure | Standard corrugated or finned tank | Explosion-proof tank for mine transformers; compact tank for traction transformers | Customizable fully sealed type (maintenance-free), type with expander, or special shape to meet space constraints; provide flameproof or increased-safety enclosures for mine transformers |
| Outlet Method | Standard bushing outlet | Customized outlet interface for special application scenarios (e.g., short-network interface for electric furnace transformers) | Can customize cable box outlet, busbar bridge connection, or American/European prefabricated interface; customize short-network interface according to furnace type and metallurgical process |
| Protection Level | Outdoor design, usually IP23 | IP55+ for offshore wind power and mine transformers | Can be customized up to IP55 and above for occasions with extremely high dust and waterproof requirements |
| Climate Protection | Suitable for general outdoor environment | Salt spray resistance for offshore wind power transformers; wind and sand resistance for plateau transformers; mold resistance for humid environment transformers | Special treatments such as wind and sand resistance, salt spray resistance (for coastal areas), mold resistance (for hot and humid areas), plateau type (for high-altitude areas), etc. |
| Fire Protection Requirements | Uses mineral insulating oil | Mineral insulating oil or high ignition point synthetic resin insulating oil according to scenarios | Can be filled with high ignition point synthetic resin insulating oil to meet higher fire safety standards |
| Environmental Protection Requirements | Standard mineral oil is recyclable | Dry-type structure for special transformers to meet environmental protection requirements; biodegradable natural ester insulating oil optional | Provides transformers with biodegradable natural ester insulating oil to meet the most stringent environmental protection requirements |
| Certification and Standards | Complies with IEC standards and routine factory tests | Complies with industry-specific standards (e.g., IEEE Std 387 for nuclear power plant transformers, GB3836/ATEX for mine explosion-proof transformers) | Can obtain specific national certifications (e.g., UL, CE, CSA, GOST-R) according to the target market; assist in obtaining classification society certifications (CCS, DNV, ABS, etc.), military standards (MIL) and nuclear power quality assurance system (QA) |
| Special Application Classification | - | 1. Electric Furnace Transformer: Used for arc furnaces, submerged arc furnaces and resistance furnaces2. Rectifier Transformer: Matched with rectifiers for electrolytic chemical industry, rail transit traction3. Traction Transformer: Used for electric locomotives, high-speed railways and urban rail transit4. Testing Transformer: Used for equipment insulation withstand voltage tests5. Others: Phase-shifting transformer, grounding transformer, frequency conversion transformer, etc. | 1. Customize electric furnace transformer parameters according to furnace type and metallurgical process2. Customize rectifier transformer with multi-pulse design to suppress harmonics3. Customize traction transformer complying with EN/IEC railway standards4. Customize cascade-type/gas-filled testing transformer for ultra-high voltage scenarios |
| Special Function Classification | - | 1. On-load Tap-changer Transformer: Adjust voltage ratio during load operation2. Split Transformer: Split low-voltage winding to limit short-circuit current3. Dry-type Amorphous Alloy Transformer: Ultra-low no-load loss (60%-70% lower than silicon steel dry-type transformers) | 1. Customize voltage regulation range (e.g., ±10%) and levels (e.g., 9 levels, 17 levels) for on-load tap-changer transformers2. Customize split impedance and number of branches for split transformers3. Provide top-level energy-saving solutions for data centers and green buildings with dry-type amorphous alloy transformers |
| Extreme Environment Adaptation | - | 1. Nuclear Power Plant Transformer: High reliability and seismic resistance2. Offshore Wind Power Transformer: Resistant to salt spray corrosion and frequent start-stop3. Mine Explosion-proof Transformer: Explosion-proof and flame-retardant | 1. Design nuclear power plant transformers according to nuclear safety classes (K1/K2/K3) and conduct LOCA test2. Customize compact, high anti-corrosion grade offshore wind power transformers integrated with converters3. Provide explosion-proof treated mine transformers complying with GB3836/ATEX standards |
| Intelligent Monitoring | Basic state monitoring | Basic state monitoring for special transformers | Integrate advanced diagnostic systems such as optical fiber temperature measurement, on-line dissolved gas analysis (DGA), vibration analysis and partial discharge monitoring, and provide predictive maintenance platform interfaces |
| Logistics Solution | Standard transportation | Special transportation for oversized/overweight special transformers | Provide complete logistics solutions such as split transportation with on-site assembly, detachable radiators and nitrogen-filled transportation for ultra-large capacity transformers |
