200kva 250kva 20kv 400v Oil Immersed Transformer

200kva 250kva 20kv 400v  Oil Immersed Transformer

1. Product Description

The 200kVA 250kVA 20kV 400V oil immersed transformer is a standard S11/S13 energy-saving three-phase distribution transformer tailored for modern 20kV medium-voltage power grid systems. As one of the most popular medium-capacity oil-filled power transformation devices, this 20kV to 400V oil immersed power transformer specializes in converting 20kV medium high-voltage grid electricity into standard 400V low-voltage power, fully matching the power supply requirements of industrial equipment, commercial facilities and residential electrical systems. Manufactured in strict compliance with IEC60076 and GB/T6451 international electrical standards, this sealed oil immersed distribution transformer adopts mature industrial manufacturing technology, with stable performance and strong grid adaptability.

Equipped with high-quality grain-oriented cold-rolled silicon steel core and high-purity oxygen-free copper windings, the 200kVA and 250kVA 20kV 400V oil immersed transformer effectively reduces no-load loss and load operation energy consumption compared with traditional old-fashioned transformers. It adopts fully sealed corrugated oil tank structure and ONAN oil natural air natural cooling technology, which can effectively isolate external moisture, dust and air, prevent insulating oil aging and deterioration, and extend the overall service life of the equipment. This 20kV medium-voltage step-down transformer features compact structure, low operating noise and excellent weather resistance, suitable for long-term continuous unattended operation, and is widely used in urban and rural power grid renovation, small and medium industrial power distribution and municipal supporting power supply projects.

2. Technical Parameters

3. Core Purpose

The core purpose of the 200kVA and 250kVA 20kV 400V oil immersed transformer is to provide safe, stable and energy-efficient voltage step-down conversion for 20kV medium-voltage power distribution systems. This practical oil-filled step-down transformer solves the voltage level mismatch problem between overhead medium-voltage power grids and low-voltage terminal electrical equipment, converting high 20kV grid voltage into standard 400V usable power that meets the operating standards of industrial, commercial and civilian electrical equipment.

In actual power grid operation, this three-phase oil immersed distribution transformer undertakes multiple key functional tasks including grid voltage stabilization, three-phase load balancing, power distribution shunting and circuit safety isolation. It can effectively suppress power grid harmonic interference, reduce voltage fluctuation and instantaneous current surge caused by load switching, and significantly improve regional power supply quality and grid operation stability. Designed for medium and small continuous power loads, it avoids equipment damage and power supply interruption risks caused by overload and voltage instability, optimizes the operating efficiency of 20kV regional power grids, and provides reliable power guarantee for various conventional power consumption scenarios.

4. Application Scenarios

With moderate load capacity, high operational stability and strong environmental adaptability, the 200kVA 250kVA 20kV/400V oil immersed power transformer covers mainstream medium and small load power supply scenarios. It is the most cost-effective energy-saving power transformation equipment for 20kV power grid construction, renovation and supporting industrial and municipal projects:

• Township & Rural Power Grid Upgrading: Widely used in rural power grid reconstruction, township centralized power supply and suburban residential area power distribution. The 200kVA oil immersed transformer is suitable for scattered village power loads, while the 250kVA model adapts to centralized township residential and small commercial power consumption, perfectly matching grassroots power grid renovation needs.

• Small & Medium Industrial Power Distribution: Ideal for small processing factories, mechanical workshops, building material processing plants and mini industrial parks. It provides stable 400V industrial power for production lines, mechanical equipment and auxiliary electrical facilities, supporting long-term continuous production power consumption.

• Urban Public Infrastructure Power Supply: Applied in community service centers, campus supporting power systems, district clinics, urban street lighting and scenic area supporting facilities, ensuring safe and uninterrupted power supply for daily public service operations.

• Outdoor Pole-mounted & Ground-mounted Substations: Thanks to excellent rainproof, dustproof and anti-corrosion performance, it adapts to outdoor open-air substations and overhead line power distribution points, supporting long-term unattended outdoor operation and reducing manual maintenance pressure.

• Distributed New Energy Grid Connection: Matched with small rooftop photovoltaic power stations and decentralized wind power generation projects in towns and rural areas, completing voltage conversion and grid-connected power distribution for new energy equipment to stabilize grid access power quality.

• Temporary Engineering Power Supply: Suitable for temporary power guarantee for water conservancy projects, road construction and field operation sites, with flexible installation and strong load adaptability to cope with complex and changeable field power consumption environments.

5. Product Features

This 200kVA & 250kVA 20kV 400V oil immersed distribution transformer adopts upgraded S13 energy-saving design and optimized manufacturing technology. Compared with traditional ordinary transformers, it has obvious advantages in energy-saving performance, operational safety, structural durability and later maintenance cost, and is highly compatible with 20kV medium-voltage power grid operation standards:

• Ultra-low Loss & High Energy Efficiency: The core iron core adopts high-permeability cold-rolled silicon steel sheets with full oblique lap stacking process, which minimizes magnetic leakage and no-load iron loss. The integral oxygen-free copper winding structure effectively reduces internal resistance and load copper loss. The overall power loss is far lower than national standard values, effectively reducing long-term grid operation and power consumption costs for users.

• Stable Voltage Output & Strong Anti-interference: Adopts advanced Dyn11 vector group design, which can accurately balance three-phase voltage and current, effectively suppress grid harmonics and eliminate voltage deviation. The multi-grade off-circuit voltage regulation device adapts to different regional grid voltage fluctuations, ensuring constant and standard 400V low-voltage output and improving terminal power supply quality.

• Fully Sealed & Durable Structure: Integral fully sealed corrugated oil tank design completely isolates internal insulating oil from external air, preventing oil oxidation, moisture ingress and dust pollution. The elastic corrugated structure automatically adjusts internal pressure with temperature changes, avoiding tank deformation and oil leakage, and greatly extending equipment service life.

• Excellent Environmental Adaptability: The whole machine adopts thickened steel plate welding and high weather-resistant anti-corrosion electrostatic spraying process, which resists ultraviolet aging, rain erosion and wind and sand impact. It can operate stably in high temperature, low temperature, high humidity and dusty harsh environments all year round.

• High Safety & Strong Short-circuit Resistance: Strict 20kV medium-voltage insulation design ensures high insulation strength and breakdown resistance. The equipment has excellent over-current, over-voltage and overload protection capabilities, with strong short-circuit impact resistance and low operational failure rate, fully guaranteeing safe operation of power grid and terminal equipment.

• Low Noise & Easy Maintenance: Optimized vibration reduction structure and mute winding technology effectively reduce operating noise, meeting urban and rural environmental protection standards. The ONAN self-cooling mode requires no auxiliary cooling equipment, and standardized modular components make daily inspection, oil quality detection and routine maintenance simple and efficient, lowering later operation and maintenance costs.

6. FAQ (Frequently Asked Questions)

Q1: How to choose between 200kVA and 250kVA 20kV 400V oil immersed transformers?

Both models adopt the same 20kV/400V voltage level, structural process and safety standards, with only differences in rated load capacity and applicable scenarios. The 200kVA oil immersed transformer is more suitable for light and medium load scenarios such as single village power supply, small shops and mini workshops, with lower no-load loss and more energy-saving daily operation. The 250kVA oil filled distribution transformer has larger load capacity and stronger instantaneous overload resistance, which is more suitable for medium load scenarios such as township centralized power supply, small industrial parks and community supporting commercial facilities. It is recommended to reserve 20% load margin during selection to adapt to future power consumption growth.

Q2: Can this 20kV 400V oil immersed transformer run stably outdoors for a long time?

Yes, this series of 200kVA/250kVA 20kV power transformers is fully optimized for outdoor working conditions. The fully sealed oil tank structure completely isolates internal insulating oil from external humid and dusty air, avoiding internal insulation damp failure and insulating oil deterioration. The overall anti-corrosion and weather-resistant coating can resist long-term ultraviolet radiation, rain erosion and seasonal temperature changes. The mature ONAN oil immersed self-cooling system ensures stable heat dissipation during 24-hour continuous operation, with extremely low failure rate, fully meeting the requirements of outdoor unattended long-term operation.

Q3: What daily maintenance does a 20kV medium-capacity oil immersed transformer need?

This energy-saving oil immersed transformer has low daily maintenance threshold and stable operational performance. Operators only need to regularly check the insulating oil level and oil clarity to ensure the oil level is within the standard scale and replace turbid and aging insulating oil in a timely manner. Clean dust and sundries on the surface of heat dissipation corrugations regularly to guarantee unobstructed heat dissipation and prevent equipment overheating faults. Inspect the tightness of high and low voltage wiring terminals and oil tank sealing points to avoid oil leakage and poor contact. In addition, test insulation resistance and operating temperature periodically to prohibit long-term overload operation. With standardized routine maintenance, the equipment service life can reach more than 20 years.