Product Overview
The 33kV oil-immersed distribution transformer is a core indoor/outdoor high-voltage power distribution device. It is suitable for three-phase AC 50Hz, 33kV power transmission and distribution systems. Widely used in urban backbone power grids, large industrial and mining enterprises, industrial parks, new energy bases, long-distance transmission support, and other high-voltage power distribution locations. It undertakes functions including voltage transformation, power distribution, voltage stabilization, and power transmission. It is key equipment for efficient power supply in 33kV distribution networks, suitable for large-scale power application scenarios and backbone grid expansion needs, balancing stability and efficiency.
The product adopts a fully sealed structure (non-sealed optional). The core uses high-quality, high-permeability cold-rolled grain-oriented silicon steel sheets. The windings use high-strength oxygen-free enameled copper wire (aluminum wire optional). Equipped with an efficient heat dissipation system and PCB-free environmentally friendly insulating oil, it features low loss, low noise, strong overload capacity, excellent insulation, stable operation, and long service life. It complies with national standards such as GB 1094, GB 20052, GB 1094.11, and has passed CCC and ISO certifications. The quality is reliable, suitable for fields such as industry, power, and new energy with extremely high requirements for power supply reliability, meeting the needs of green grid construction and high-voltage distribution upgrades. The technology is mature with outstanding cost-performance.
Operating Environment
1. Ambient temperature: -30℃～+40℃, 24h average ≤ +35℃; anti-freezing design customizable for low temperatures to ensure oil fluidity and equipment startup, suitable for high-voltage distribution scenarios in severely cold regions.
2. Altitude: ≤1000m; customizable for high-altitude adaptation up to 4000m under special conditions, with optimized insulation structure for high-altitude environments, meeting the insulation requirements of GB 1094.11, avoiding the impact of high altitude on insulation performance.
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 use in humid and polluted areas.
4. Installation site: No violent vibration, corrosive gases, flammable or explosive dust, or conductive dust; keep away from strong electromagnetic interference, suitable for C3-C5 corrosive environments, meeting the stringent requirements of industrial plants and outdoor high-voltage substations.
5. Outdoor units withstand rain, snow, sand, dust, and salt spray erosion, equipped with rain, dust, and corrosion protection enclosures; indoor units require good ventilation and no standing water to avoid overheating, suitable for fixed laboratory and centralized switchgear room installation scenarios.
6. Installation inclination: ≤3° relative to the vertical plane to ensure equipment stability and even oil distribution, guaranteeing heat dissipation and insulation performance, suitable for complex installation scenarios, avoiding displacement during transport and operation.
Technical Parameters
Item | Unit | Parameters |
|---|---|---|
Rated Voltage | kV | 33±5%/0.4 (±2×2.5% customizable) |
Rated Frequency | Hz | 50 |
Rated Capacity | kVA | 200, 250, 315～10000 (full series, larger capacities customizable) |
Number of Phases | --- | Three-phase |
Connection Symbol | --- | Dyn11 (common), Yyn0 (customizable) |
Cooling Method | --- | ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced), OFAF (Forced Oil Forced Air - customizable) |
Insulation Level | kV | Power frequency withstand voltage 95kV/1min; induced withstand voltage 185kV (10s), complies with GB 1094.11 |
Impedance Voltage | % | 6.0%, 8.0%, 10.0%, 12.0% (matched according to capacity, customizable) |
Noise Level | dB | ≤68～82 (low-noise type customizable to ≤60dB, with optimized noise reduction structure) |
Protection Grade | --- | Indoor IP20; Outdoor IP33, IP54, IP65 (WF2 corrosion protection grade customizable, suitable for salt spray) |
Insulating Oil | --- | 25# environmentally friendly transformer oil (45# low-temperature type, anti-aging type customizable, PCB-free, complies with GB 50148) |
Product Features
1. High Efficiency, Low Loss, Outstanding Energy Savings: Uses high-permeability grain-oriented silicon steel sheets and multi-step staggered lap joint design. Optimized winding arrangement using oxygen-free copper conductors results in low loss and low noise, meeting national Tier 1/Tier 2 energy efficiency standards, compatible with S22/S13 series designs, suitable for long-term continuous industrial operation, contributing to energy saving and emission reduction, and lowering grid operating costs.
2. Excellent Insulation, Safe and Reliable: Optimized multi-layer insulation structure for 33kV high voltage, combined with PCB-free environmentally friendly insulating oil and vacuum oil filling process, providing high insulation strength and strong short-circuit withstand capability. Passes GB 1094.11 insulation tests, eliminating risks of electric leakage and oil leakage, complying with high-voltage equipment safety regulations, ensuring personnel and equipment safety.
3. Efficient Heat Dissipation, Strong Overload Capacity: Uses corrugated tanks or high-efficiency radiators. Forced oil forced air cooling mode is customizable. High heat dissipation efficiency and low temperature rise. Allows stable long-term operation at rated load with strong short-term overload capacity, suitable for load fluctuations in 33kV distribution networks, meeting the needs of large-scale power application scenarios and long-distance transmission support.
4. Robust Structure, Comprehensive Protection: Tank made of high-quality cold-rolled steel plate with good sealing and vibration resistance. The core and windings are firmly positioned within the tank, preventing displacement during transport and operation. Outdoor units have rain, dust, and corrosion protection performance, suitable for salt spray and industrial corrosive environments. Indoor units are compact and aesthetically pleasing, suitable for various complex high-voltage scenarios.
5. 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. Environmentally friendly insulating oil reduces environmental impact and complies with GB 50148 acceptance standards, lowering replacement and operational costs.
6. Easy Installation, Wide Versatility: Supports indoor/outdoor, floor/pole mounting. Can be directly connected to 33kV distribution networks with strong compatibility, suitable for urban backbone grids, industrial plants, new energy bases, and other scenarios. Convenient installation and commissioning, allowing rapid deployment.
Our Advantages
1. Strong Customization Capability: Capacity, voltage, protection grade, etc., can be customized according to needs, suitable for special conditions such as high altitude, low temperature, high corrosion, as well as new energy, industrial, and backbone grid renovation scenarios, meeting the needs of large-scale power consumption and long-distance transmission.
2. Standardized Production & Strict Quality Control: Standardized production with quality control throughout the entire process and multiple inspections, including insulation performance, salt spray corrosion, and oil quality tests, ensures consistent product performance. A complete factory test report is provided for each unit, complying with GB 50148 acceptance requirements.
3. Complete Qualifications: Possesses CCC, ISO certifications, and type test reports, meeting standards such as GB 1094.11, and satisfying grid connection and large-scale project acceptance requirements without needing to prepare additional qualification materials.
4. Stable Delivery & Comprehensive Support: Stable delivery times, supporting expedited orders. Provides professional transportation, on-site installation guidance, and commissioning services, ensuring power supply continuity for 33kV distribution networks and facilitating rapid implementation of large-scale projects.
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.
Ordering Guide
Please provide the following information when ordering to ensure accurate product matching:
1. Specify the required rated capacity, input voltage (33kV)/output voltage, frequency, and connection symbol to define core power requirements, suitable for large loads and long-distance transmission support.
2. Describe the operating environment (indoor/outdoor, altitude, temperature, humidity, etc.) and any special requirements such as corrosion protection, anti-freezing, or salt spray protection, suitable for different corrosion levels, high altitude, and severe cold environments.
3. Determine the cooling method, insulating oil type, impedance voltage, and energy efficiency level to match actual operating conditions. Tier 1/Tier 2 energy efficiency and forced oil forced air cooling mode can be selected as needed.
4. Provide installation method, cable entry/exit method, and switchgear room layout requirements to optimize the installation plan, suitable for grid renovation and large-scale new construction projects.
5. Specify any special functional requirements such as tap-changers, temperature measurement devices, smart monitoring, etc., to meet individual usage needs and smart grid construction requirements.
