800kva 1000kva 20kv 400v Oil Immersed Transformer

800kva 1000kva 20kv 400v Oil Immersed Transformer

1. Product Description

The 800kVA 1000kVA 20kV 400V oil immersed transformer is a standard S11/S13 energy-saving three-phase distribution transformer designed exclusively for 20kV medium-voltage power grid systems. As a widely adopted oil-filled step-down power transformer for medium and large load scenarios, this 20kV to 400V oil immersed power equipment delivers reliable voltage conversion, stepping down 20kV high-voltage grid power to standard 400V low-voltage power suitable for industrial production, commercial operation and municipal power supply. Manufactured in strict accordance with IEC60076 and GB/T6451 industry standards, this sealed oil immersed distribution transformer undergoes rigorous factory testing to ensure stable performance in long-term continuous operation.

Built with high-quality grain-oriented cold-rolled silicon steel core and high-purity oxygen-free copper windings, the 800kVA and 1000kVA 20kV 400V oil immersed transformer effectively reduces no-load loss and operational heat generation compared with traditional transformer models. Adopting fully sealed corrugated oil tank structure and ONAN oil natural self-cooling technology, the equipment avoids insulating oil oxidation, moisture intrusion and dust contamination, greatly extending service life. With moderate load capacity, compact structure and strong environmental adaptability, this medium-capacity 20kV power transformer is the ideal power transformation solution for industrial parks, urban grid renovation and public infrastructure power distribution projects.

2.  Technical Parameters

3. Core Purpose

The core purpose of the 800kVA and 1000kVA 20kV 400V oil immersed transformer is to deliver safe, stable and efficient voltage step-down conversion for 20kV medium-voltage power distribution systems. This reliable oil-filled distribution transformer solves the voltage level mismatch between overhead high-voltage transmission lines and low-voltage terminal electrical equipment, converting inaccessible 20kV grid voltage into standard 400V usable power for industrial production, commercial facilities and residential power consumption.

In daily grid operation, this three-phase oil immersed power transformer undertakes multiple critical functions including voltage stabilization, three-phase load balancing, power distribution shunting and circuit isolation protection. It effectively suppresses power grid harmonics, reduces voltage fluctuation and current surge caused by load switching, and improves overall power supply quality and grid operational stability. Designed for medium and large continuous loads, it eliminates power supply instability and equipment damage risks caused by overload operation, supporting stable and efficient operation of regional 20kV power grid systems and ensuring uninterrupted power supply for key power consumption units.

4. Application Scenarios

Featuring moderate load capacity, high operational stability and wide environmental adaptability, the 800kVA 1000kVA 20kV/400V oil immersed power transformer covers mainstream medium-load power supply scenarios in industrial, municipal and new energy fields. It is the most cost-effective energy-saving transformer for 20kV power grid construction and renovation projects:

• Medium-sized Industrial Park Power Distribution: Suitable for standard industrial parks, small and medium manufacturing factories, mechanical processing workshops and light industrial production bases. The 800kVA model matches conventional medium-load production power demand, while the 1000kVA model adapts to factories with higher power consumption and multi-equipment parallel operation.

• Urban & Township Power Grid Upgrading: Widely used in urban suburban grid renovation, township centralized power supply and rural high-standard power grid construction. It replaces old high-loss transformers to improve power supply efficiency and meet the growing residential and commercial power consumption demand.

• Public Infrastructure Supporting Power Supply: Ideal for campus comprehensive power distribution, district hospital power systems, urban community service centers and scenic area supporting facilities. It provides stable and safe 24-hour power guarantee for public service equipment.

• Outdoor Substation & Overhead Line Power Distribution: With excellent rainproof, dustproof and anti-corrosion performance, it adapts to outdoor ground-mounted substations and overhead line power distribution points, supporting long-term unattended outdoor continuous operation.

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

• Field Engineering & Mining Power Supply: Applicable for long-term power supply of mining sites, water conservancy projects and large-scale construction projects, with strong load impact resistance to adapt to complex and changeable field power consumption environments.

5. Product Features

This 800kVA & 1000kVA 20kV 400V oil immersed distribution transformer adopts mature S13 energy-saving design and optimized manufacturing technology. It stands out in medium-capacity 20kV power distribution scenarios with low energy consumption, stable operation, strong durability and low maintenance cost, fully meeting the practical operation needs of modern power grids:

• Low Loss & High Energy Efficiency: The core iron core adopts high-permeability cold-rolled silicon steel sheets with full oblique lap stacking process, minimizing magnetic leakage and no-load iron loss. The integral oxygen-free copper winding effectively reduces load copper loss, with overall power loss far lower than national standard values, cutting long-term grid operation and power consumption costs significantly.

• Stable Voltage Output & Strong Anti-interference: Advanced Dyn11 vector group design balances three-phase current and voltage efficiently, suppresses grid harmonic interference and eliminates 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: Integrated fully sealed corrugated oil tank structure isolates internal insulating oil from external air, preventing oil aging, moisture ingress and dust pollution. The elastic corrugated structure automatically adjusts internal pressure with temperature changes, avoiding tank deformation and oil leakage, and extending equipment service life.

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

• 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, ensuring safe grid and equipment operation.

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

6. FAQ (Frequently Asked Questions)

Q1: How to choose between 800kVA and 1000kVA 20kV 400V oil immersed transformers?

Both models share identical 20kV/400V voltage level, structural process and safety standards, with the core difference lying in load capacity and applicable scenarios. The 800kVA oil immersed transformer is suitable for medium-light load scenarios such as single medium-sized factories, ordinary community power supply and conventional public facilities, with lower no-load loss and more energy-saving operation under daily load conditions. The 1000kVA oil filled distribution transformer has larger rated capacity and stronger instantaneous overload resistance, ideal for scenarios with higher peak power consumption such as multi-workshop industrial parks, large residential communities and supporting commercial facilities. It is recommended to reserve 20%-30% load margin when selecting models to adapt to future power consumption growth.

Q2: Is this 20kV 400V oil immersed transformer suitable for long-term outdoor unattended operation?

Yes, this series of 800kVA/1000kVA 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, preventing internal insulation damp failure and oil deterioration. The overall anti-corrosion and weather-resistant coating resists 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 low failure rate and no need for frequent manual inspection, fully meeting outdoor unattended power distribution operation requirements.

Q3: What routine maintenance work is required for 20kV medium-capacity oil immersed transformers?

This energy-saving oil immersed transformer has low daily maintenance threshold and stable operational performance. Operators only need to conduct regular visual inspection of insulating oil level and clarity to ensure the oil level is within the standard scale and replace turbid and aging insulating oil in time. Clean dust and sundries on heat dissipation corrugations regularly to guarantee unobstructed heat dissipation and prevent overheating faults. Inspect the tightness of high and low voltage wiring terminals and oil tank sealing points to avoid oil leakage and poor contact. Additionally, 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.