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S-20000-69.9-34.5
YAWEI
>> Product Introduction
This 20MVA (20000kVA) three-phase power transformer is engineered with a primary voltage of 69.9kV and a secondary voltage of 34.5kV, fully designed and manufactured in accordance with strict IEEE standards for outdoor installation. Adopting a core-type structure with high-purity copper windings and filled with PCB-free 25# mineral insulating oil, it is equipped with an ONAN natural cooling system, perfectly adapted to outdoor working conditions at an altitude of 1000m and ambient temperature of 20℃ (working temperature range: -25℃ to +40℃). Boasting a high efficiency of 99.6%, precise voltage regulation and excellent insulation performance, it is a reliable core equipment for medium and high voltage power transmission and distribution systems, ideal for power grid projects, industrial parks and large-scale industrial power supply scenarios.
Product Advantage
Yawei S-20000-69.9-34.5 Power Transformer
1.High Energy Conversion Efficiency
Achieves a rated efficiency of 99.6% with pure copper windings and optimized core structure, minimizing energy loss during power transmission and realizing excellent energy-saving performance for long-term operation.
2.Professional HV/LV Insulation Performance
With ultra-high BIL of 350kV for high-voltage side and 200kV for low-voltage side, the transformer has outstanding insulation and lightning resistance, ensuring stable and safe operation in medium and high voltage power grid environments.
3.Precise Off-Load Voltage Regulation
Equipped with a no-load tap changer on the HV side with four 2.5% FCAN de-energized taps below rated voltage, which can flexibly adjust the output voltage according to grid operation conditions to ensure power supply stability.
4.Outdoor Optimized Design
Adapted to outdoor working conditions at an altitude of 1000m, with a wide working temperature range of -25℃ to +40℃, strong environmental adaptability and reliable operation under various natural climate conditions.
5.Safe & Eco-Friendly Insulation Solution
Filled with PCB-free 25# mineral insulating oil, no environmental pollution, excellent thermal and insulating performance, effectively reducing the risk of insulation failure and ensuring equipment operation safety.
6.Stable Heat Dissipation System
ONAN natural oil circulation and natural cooling system precisely controls the operating temperature, with top oil temperature rise of 60℃ and winding temperature rise of 65℃, avoiding overheating and greatly extending the service life of internal components.
7.Durable Structural Design
Mild steel tank with ANSI 61 gray anti-corrosion coating, excellent resistance to outdoor corrosion, impact and weathering, the integral structure is firm and durable, suitable for long-term outdoor operation.
>> Technical Parameters
| Type | Step down power transformer |
| Model | S-20000-69.9-34.5 |
| Cooling Method | ONAN/ONAF |
| Primary Voltage | 69.6KV |
| Secondary Voltage | 134.5kV |
| Rated Frequency | 50HZ/60HZ |
| Rated Power | 20MVA |
| Winding Material | Copper |
| Voltage Regulation | OLTC |
| Tapping Range | ±2×2.5% |
| Connection Group | Dy5 |
| Transformer Dimension | - |
| Weight | - |
>> Product Uses
This 20MVA 69.9kV/34.5kV medium and high voltage power transformer is a key power conversion and transmission equipment for large-capacity power supply systems, and its high efficiency, high insulation performance and outdoor adaptability make it widely applicable to various industrial and infrastructure scenarios with large power load and high requirements for power supply stability:
Power Grid Construction & Upgrading Projects：As a core equipment for the medium-voltage power grid distribution link, it is suitable for urban and rural power grid transformation, regional power grid interconnection and substation construction projects, realizing the step-down conversion of 69.9kV high-voltage power to 34.5kV medium-voltage power, and undertaking the power transmission task for large-scale regional power supply networks.
Large-Scale Industrial Parks & Economic Development Zones：Applicable to national-level economic and technological development zones, industrial parks and chemical industrial parks with concentrated high-energy-consuming enterprises, providing stable and large-capacity medium-voltage power for multiple enterprises in the park, meeting the simultaneous power demand of production, processing and supporting facilities.
Heavy Industry Manufacturing Bases：Ideal for steel, non-ferrous metal smelting, machinery manufacturing, shipbuilding and other heavy industry manufacturing bases with large power load, adapting to the high-power and continuous power supply requirements of industrial production equipment, and ensuring the stable operation of the production line.
Energy & Power Generation Projects：Suitable for the power transmission and distribution system of renewable energy power stations such as large-scale wind farms and photovoltaic power bases, as well as thermal power, hydropower and gas power generation supporting projects, realizing the grid connection and step-down transmission of the electric energy generated by the power station to the regional medium-voltage power grid.
Large-Scale Infrastructure & Public Utilities：Applied to large-scale infrastructure projects such as intercity high-speed rail, urban rail transit, large airports and port wharves, as well as large public utility projects such as municipal central heating and water supply and drainage systems, providing reliable medium-voltage power for the operation of public facilities and supporting equipment.
Commercial & Logistics Mega Complexes：Suitable for super large commercial plazas, cross-border logistics parks, bonded zones and other large-scale complexes with integrated business, logistics and warehousing, meeting the large-capacity power demand of intelligent logistics equipment, commercial operation facilities and supporting office and living areas.
Mining & Resource Development Projects：Applicable to large open-pit mines, underground mining areas and resource development bases such as coal, non-metallic minerals, adapting to the harsh outdoor working environment of mining areas, and providing stable medium-voltage power for mining machinery, mineral processing equipment and mine supporting systems.
>> Product Operate Guide
Generic installation and use instructions for 110kV class power transformers, containing the following sections:
1. Lifting and jacking of transformer body
2. Transportation and handling
3.Check and acceptance
4.Storage and keeping of product (body and component)
5.Overall reassembly on site
6.Vacuum oil filling: vacuum oil filling must be conducted after general assembly of the transformer has been fully completed.
7.External surface cleaning and painting makeup of transformer
8.Check and handover test before commissioning
9.Operation
10. Inspection and maintenance
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