Product Overview
The 20kV 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, 20kV power transmission and distribution systems. Widely used in urban power grid upgrades, large industrial and mining enterprises, industrial parks, new energy bases, rural power grid renovation, 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 20kV distribution networks, suitable for large and medium-sized power application scenarios and grid expansion needs.
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, and has passed CCC and ISO certifications. The quality is reliable, suitable for fields such as industry, power, and new energy with high requirements for power supply reliability, meeting the needs of green grid construction.
Operating Environment
1. Ambient temperature: -30℃～+40℃, 24h average ≤ +35℃; anti-freezing design customizable for low temperatures to ensure oil fluidity and equipment startup.
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.
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.
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.
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.
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.
Technical Parameters
Item | Unit | Parameters |
|---|---|---|
Rated Voltage | kV | 20±5%/0.4 (±2×2.5% customizable) |
Rated Frequency | Hz | 50 |
Rated Capacity | kVA | 100, 125, 160～6300 (full series, larger capacities customizable) |
Number of Phases | --- | Three-phase |
Connection Symbol | --- | Dyn11 (common), Yyn0 (customizable) |
Cooling Method | --- | ONAN (Oil Natural Air Natural), ONAF (customizable) |
Insulation Level | kV | Power frequency withstand voltage 65kV/1min; induced withstand voltage 95kV (10s), complies with GB 1094.11 |
Impedance Voltage | % | 6.0%, 8.0%, 10.0% (matched according to capacity, customizable) |
Noise Level | dB | ≤65～78 (low-noise type customizable to ≤58dB, with optimized noise reduction structure) |
Protection Grade | --- | Indoor IP20; Outdoor IP33, IP54, IP65 (WF2 corrosion protection grade customizable) |
Insulating Oil | --- | 25# environmentally friendly transformer oil (45# low-temperature type, anti-aging type customizable, PCB-free) |
Product Features
1. High Efficiency, Low Loss, Outstanding Energy Savings: Uses high-permeability grain-oriented silicon steel sheets and stepped core 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 series design, suitable for long-term continuous industrial operation, contributing to energy saving and emission reduction.
2. Excellent Insulation, Safe and Reliable: Optimized insulation structure for 20kV 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 safety regulations.
3. Efficient Heat Dissipation, Strong Overload Capacity: Uses corrugated tanks or high-efficiency radiators. 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 20kV distribution networks and meeting the needs of large and medium-sized power application scenarios.
4. Robust Structure, Comprehensive Protection: Tank made of high-quality cold-rolled steel plate with good sealing and vibration resistance. 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, lowering replacement and operational costs.
6. Easy Installation, Wide Versatility: Supports indoor/outdoor, floor/pole mounting. Can be directly connected to 20kV distribution networks with strong compatibility, suitable for urban, rural grids, and new energy scenarios, with convenient installation and commissioning.
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 grid renovation scenarios.
2. Standardized Production & Strict Quality Control: Standardized production with quality control throughout the entire process and multiple inspections, including insulation performance and salt spray corrosion tests, ensures consistent product performance. A complete factory test report is provided for each unit.
3. Complete Qualifications: Possesses CCC, ISO certifications, and type test reports, meeting standards such as GB 1094.11, and satisfying grid connection and project acceptance requirements.
4. Stable Delivery & Comprehensive Support: Stable delivery times, supporting expedited orders. Provides transportation, installation guidance, and commissioning services, ensuring power supply continuity for 20kV distribution networks and facilitating rapid project implementation.
5. Complete After-Sales Service: Provides full lifecycle support including technical training, inspections, and fault handling. 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 (20kV)/output voltage, frequency, and connection symbol to define core power requirements, suitable for medium to large loads.
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 level 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 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 both grid renovation and new construction projects.
5. Specify any special functional requirements such as tap-changers, temperature measurement devices, etc., to meet individual usage needs and smart monitoring requirements.
