Oil-Immersed Power Transformer Product Introduction
1. Product Overview
This is a three-phase oil-immersed power transformer (mainstream models such as S11/S13-M series), one of the most classic and widely used power distribution equipment in power systems. It uses mineral insulating oil as the core medium, which functions as both insulation and cooling. It steps down the electric energy from the high-voltage power grid and transmits it to the low-voltage distribution system, providing stable and reliable power supply for industrial, commercial, municipal and other scenarios.
2. Core Structure and Principle
Key Structural Components
Component | Function Description |
|---|
Corrugated Oil Tank/Radiator | Sealed storage of insulating oil, increasing heat dissipation area through corrugated structure for efficient natural cooling |
High-Voltage Porcelain Bushing | Leads out high-voltage winding connections, realizing insulation isolation between live parts and the oil tank |
Oil Conservator | Compensates for thermal expansion and contraction of insulating oil, isolates oil from direct contact with air, and delays oil aging |
Iron Core and Winding | Core electromagnetic components of the transformer, adopting high-permeability silicon steel sheets and high-quality windings to reduce losses and improve efficiency |
Respirator | Filters air entering the oil conservator, absorbs moisture, and prevents insulating oil from dampness |
⚡ Working Principle
Based on the principle of electromagnetic induction, it converts alternating current from the high-voltage side (e.g., 10kV/35kV) to the low-voltage side (e.g., 0.4kV) through iron core coupling, realizing voltage level conversion and efficient power transmission. The insulating oil circulates naturally in the oil tank, conducts the heat generated by the windings and iron core to the radiator, and dissipates it into the air to ensure continuous and stable operation of the equipment.
3. Core Technical Advantages
Efficient Heat Dissipation, Strong Overload Capacity
The thermal conductivity of insulating oil is far superior to air, with high heat dissipation efficiency. It can withstand long-term heavy load and overload operation, suitable for industrial scenarios with large load and continuous work.
Excellent Insulation Performance, High Reliability
The insulation strength of transformer oil is 4-5 times that of air, which can effectively prevent breakdown faults between windings, and between windings and iron core, with long equipment life and low failure rate.
Fully Sealed Design, Maintenance-Free
The fully sealed corrugated oil tank structure eliminates contact between oil and air, avoids oil oxidation and moisture, and eliminates the need for regular oil replacement, greatly reducing operation and maintenance costs.
Significant Cost Advantage
Compared with dry-type transformers of the same capacity, oil-immersed transformers have lower procurement costs, suitable for large-scale power distribution projects in outdoor and non-crowded areas.
Strong Adaptability, Wide Application
Supports multiple high-voltage levels such as 10kV and 35kV, with capacity covering 30kVA~2500kVA (larger capacity can be customized), meeting power distribution needs of different scenarios.
4. Core Technical Parameters (General Range)
Parameter Item | Standard Specification |
|---|
Rated Capacity | 30kVA ~ 2500kVA (customizable to 10000kVA+) |
High-Voltage Rated Voltage | 6kV, 10kV, 35kV (customizable to 6.3kV, 10.5kV, etc.) |
Low-Voltage Rated Voltage | 0.4kV (standard, customizable to 0.69kV, etc.) |
Voltage Regulation Method | ±2×2.5% No-Excitation Voltage Regulation (On-Load Voltage Regulation optional) |
Insulation Class | Class A (maximum heat resistance 105℃) |
Cooling Method | ONAN (Oil-Immersed Natural Cooling, mainstream) / ONAF (Oil-Immersed Forced Air Cooling, optional for large capacity) |
Implementation Standards | National/International standards such as GB/T 6451, IEC 60076 |
Protection Class | IP54 (fully sealed structure, dustproof and waterproof) |
5. Application Scenarios
Outdoor Power Distribution: Outdoor box-type substations, rural power grids, suburban distribution rooms
Industrial Scenarios: Factories, mines, oil fields, photovoltaic/wind power grid connection systems
Municipal Infrastructure: Road lighting, water conservancy pump stations, outdoor power supply for rail transit
Commercial Supporting: Large shopping malls, logistics parks, outdoor power distribution projects in industrial parks, etc.
6. Core Comparison with Dry-Type Transformers
Characteristic | Oil-Immersed Transformer | Dry-Type Transformer (e.g., SCB10) |
|---|
Insulation/Cooling Medium | Mineral Insulating Oil | Epoxy Resin + Air |
Fire Performance | Requires supporting fire-fighting facilities, with oil leakage risk | Flame-retardant and self-extinguishing, oil-free, high fire rating |
Installation Environment | Outdoor, non-crowded areas | Indoor, crowded areas (hospitals, shopping malls) |
Procurement Cost | Low | High |
Maintenance Requirement | Regular inspection, basically maintenance-free for fully sealed models | Maintenance-free |
Overload Capacity | Strong | Average |
