Product Overview
The 11kV oil-immersed distribution transformer is a general-purpose indoor/outdoor core equipment for high-voltage power distribution. It is suitable for three-phase AC 50Hz, rated voltage 11kV power transmission and distribution systems. Widely used in urban power grid upgrades, industrial and mining enterprises, industrial parks, large residential areas, water conservancy projects, rail transit, petrochemical, metallurgical and mining, and other high-voltage power distribution locations. Its main functions include voltage transformation, power distribution, system voltage stabilization, and power transmission. It can adapt to various applications such as high-voltage power distribution, motor power supply, lighting distribution, and reactive power compensation. It is key equipment for achieving efficient power transmission and ensuring stable power supply in 11kV distribution networks.
The product adopts a fully sealed structure (non-sealed structure optional). The core uses high-quality, high-permeability cold-rolled grain-oriented silicon steel sheets. The windings use high-strength enameled copper wire (aluminum wire optional). Equipped with an efficient heat dissipation system and specialized insulating oil, it features low loss, low noise, strong overload capacity, excellent insulation performance, stable operation, and long service life. It complies with national standards GB 1094.1～1094.5, GB/T 6451, GB 20052, and has passed CCC compulsory certification and ISO quality system certification, ensuring reliable performance and quality, suitable for various complex high-voltage distribution environments, and meeting high-voltage power supply needs in different scenarios.
Operating Environment
1. Ambient temperature: -30℃～+40℃, 24-hour average temperature ≤ +35℃; anti-freezing design customizable for low-temperature environments, suitable for use in severely cold regions.
2. Altitude: ≤1000m; customizable for high-altitude adaptation up to 4000m under special conditions, meeting distribution needs in high-altitude areas.
3. Relative humidity: Daily average ≤ 95%, monthly average ≤ 90%; avoid severe condensation or standing water; anti-condensation devices can be provided for humid environments to prevent equipment damage from moisture.
4. Installation site: No violent vibration, no corrosive gases, no flammable or explosive dust, no conductive dust; keep away from strong electromagnetic interference to ensure stable equipment operation.
5. Outdoor units can withstand rain, snow, sand, sunlight, severe cold, and other natural environments; indoor units require good ventilation and no standing water to prevent overheating.
6. Installation inclination: Angle between the unit body and vertical plane ≤ 3° to ensure stable operation and even oil distribution, avoiding localized oil overheating.
Technical Parameters
Item | Unit | Parameters |
|---|---|---|
Rated Voltage | kV | 11±5%/0.4 (±2×2.5% customizable) |
Rated Frequency | Hz | 50 |
Rated Capacity | kVA | 50, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500 |
Number of Phases | --- | Three-phase |
Connection Symbol | --- | Dyn11 (common), Yyn0 (customizable) |
Cooling Method | --- | ONAN (Oil Natural Air Natural), ONAF (Oil Natural Air Forced - customizable) |
Insulation Level | kV | Power frequency withstand voltage 45kV/1min; induced withstand voltage 80kV (10s) |
Impedance Voltage | % | 4.0%, 4.5%, 6.0% (matched according to capacity, customizable) |
Noise Level | dB | ≤60～72 (depending on capacity, low-noise type customizable) |
Protection Grade | --- | Indoor IP20; Outdoor IP33, IP54 (customizable) |
Insulating Oil | --- | 25# transformer oil (45# low-temperature type customizable) |
Product Features
1. High Efficiency, Low Loss, Outstanding Energy Savings: Uses high-permeability cold-rolled grain-oriented silicon steel sheets, stepped core joints, and fully inclined core structure to effectively reduce no-load loss and operating noise. Optimized winding conductor cross-sections and arrangement reduce load loss, significantly saving electricity costs over long-term operation, meeting national energy efficiency standards, suitable for green energy-saving distribution needs, and aligning with current power energy-saving renovation trends.
2. Excellent Insulation, High Safety Margin: Optimized multi-layer insulation structure for 11kV high-voltage operating conditions, using high-quality insulating materials, paired with specialized transformer oil, providing three functions: insulation, heat dissipation, and arc extinguishing. The overall vacuum oil filling process thoroughly removes bubbles and impurities from the oil, resulting in high insulation strength, strong short-circuit withstand capability, resistance to aging during long-term high-voltage operation, eliminating safety hazards like electric leakage and oil leakage, ensuring personnel and equipment safety.
3. Efficient Heat Dissipation, Strong Overload Capacity: Uses corrugated tank, tube, or fin-type radiator design, providing large cooling surface area and low temperature rise, with heat dissipation efficiency exceeding industry standards. Allows stable long-term operation at rated load, with strong short-term overload capacity to easily handle sudden peak power demands, suitable for complex operating conditions and load fluctuation needs of 11kV distribution networks.
4. Robust Structure, Comprehensive Protection: Tank made from high-quality cold-rolled steel plates welded for high strength and good sealing, effectively preventing oil leakage and impact from external vibration. Outdoor units feature rain, dust, and anti-oil-fouling protection; indoor units are compact and aesthetically pleasing, adaptable to different installation environments with strong durability, suitable for various complex high-voltage distribution scenarios.
5. Maintenance-Free Design, Long Service Life: Fully sealed structure effectively isolates air and moisture, slowing down the oxidation rate of the insulating oil, significantly reducing maintenance frequency. The overall design meets long-term operation standards for 11kV high-voltage equipment. Under normal maintenance conditions, the service life can exceed 25 years, reducing equipment replacement costs and operational maintenance pressure.
6. Easy Installation, Wide Versatility: Moderate size and stable center of gravity, supporting various installation methods: indoor/outdoor, floor/pole mounting. Can be directly connected to 11kV distribution networks, used with 11kV switchgear and distribution cabinets, offering strong system compatibility and flexible adjustment according to site conditions, adapting to different switchgear room layout requirements, with convenient and efficient installation and commissioning.
Our Advantages
1. Strong Customization Capability: Products can be customized according to customer requirements for different capacities, voltage levels, connection types, cooling methods, and protection grades, precisely adapting to special conditions such as high altitude, low temperature, and corrosion protection, meeting the diverse needs of 11kV distribution networks.
2. Standardized Production & Strict Quality Control: Standardized production line operations with an established, stringent quality management system. Multiple inspections throughout the entire process, from raw material procurement, core processing, winding manufacturing to final assembly and testing, ensure consistent product performance and reliable quality, meeting the operating standards for 11kV high-voltage equipment.
3. Complete Qualifications: Provides complete type test reports, factory test reports, CCC certification, and other authoritative documents, fully meeting grid connection and project acceptance requirements without needing to prepare additional qualification materials, facilitating rapid project implementation.
4. Stable Delivery & Comprehensive Support: Stable delivery times, supporting expedited orders. Provides professional transportation, on-site installation guidance, and equipment commissioning services, ensuring rapid equipment deployment and maintaining power supply continuity for 11kV distribution networks.
5. Complete After-Sales Service System: Provides full lifecycle support including technical training, regular inspections, emergency fault handling, oil testing and replacement, ensuring stable equipment operation and peace of mind for customers.
Ordering Guide
Please provide the following detailed information when ordering to enable precise product customization and solution optimization:
1. Specify the required rated capacity, input voltage (11kV), output voltage, frequency, and connection symbol to define core power requirements, ensuring suitability for 11kV distribution network conditions.
2. Describe the operating environment, including indoor/outdoor, altitude, ambient temperature, humidity, and any special requirements like corrosion protection or anti-freezing, facilitating the customization of suitable products.
3. Determine the cooling method, insulating oil type, impedance voltage, and energy efficiency level to clarify equipment performance requirements, matching the needs of the actual power application scenario.
4. Provide installation method (floor/pole mounting), cable entry/exit method, and any relevant switchgear room layout requirements for optimized installation planning and improved construction efficiency.
5. Specify any special functional requirements, such as tap-changer positions, temperature measurement devices, pressure relief valves, oil level gauges, thermostats, low-noise design, etc., to meet individual usage needs.
