3 Phase 20kv 440v Transformer Electricity 500kva 630kva 800kva Class Oil Immersed Transformer
1. Product Description
The 3 Phase 20kV 440V Class Oil Immersed Transformer is a professional medium-voltage power distribution transformer designed for industrial and grid electricity conversion applications, available in three mainstream rated capacities of 500kVA, 630kVA and 800kVA. Manufactured in full compliance with international power equipment standards, this high-efficiency oil immersed power transformer features a standard 20kV high-voltage input and 440V low-voltage three-phase output, perfectly matching global industrial low-voltage power supply systems and medium-voltage grid distribution requirements. As a core class oil immersed distribution device, it adopts advanced sealed oil cooling technology and high-precision copper winding structure, effectively solving voltage conversion and power stabilization problems in medium and large power consumption scenarios.
This three-phase 20kV to 440V oil immersed transformer supports 50Hz and 60Hz universal power frequency, with optional vector groups including Dyn11 and Yyn0 to adapt to different grid connection standards. Covering 500kVA, 630kVA and 800kVA load grades, it can meet the power demands of different-scale industrial parks, power grid stations and municipal engineering projects. Compared with conventional dry-type transformers, this class oil immersed electricity transformer delivers stronger overload resistance, better heat dissipation performance and longer service life, making it the preferred equipment for outdoor and indoor medium-voltage power distribution engineering worldwide.
2. Core Product Features
2.1 Multi-Capacity Grade Matching & Precise Voltage Conversion
Available in 500kVA, 630kVA and 800kVA three complete capacity grades, this 3 phase 20kV 440V oil immersed transformer covers small, medium and medium-large industrial power load demands, providing flexible model selection for different power distribution projects. The equipment achieves precise step-down conversion from 20kV medium voltage to standard 440V three-phase low voltage, with balanced three-phase voltage and current output, effectively avoiding phase unbalance, voltage deviation and power fluctuation during full-load and long-term continuous operation. The stable voltage output ensures the safe and efficient operation of terminal industrial electrical equipment.
2.2 High-Efficiency Energy-Saving & Low Loss Performance
Adopting high-grade oriented silicon steel sheet core and high-purity copper winding process, this class oil immersed power transformer greatly reduces no-load loss, iron loss and load loss during operation. The optimized magnetic circuit structure minimizes magnetic flux leakage, while the low-resistance winding design cuts down operational power consumption significantly. The energy efficiency level meets international advanced standards, effectively reducing long-term grid operation costs and power line loss. Whether it is a 500kVA conventional load scenario or an 800kVA high-load continuous operation scenario, the equipment can maintain low energy consumption and high power conversion efficiency, realizing green and economical power distribution.
2.3 Reliable Oil Immersed Cooling & Sealed Structure
Equipped with a scientific natural oil circulation heat dissipation system and fully sealed corrugated oil tank, this 20kV 440V electricity transformer relies on high-purity insulating oil for rapid heat conduction and heat dissipation. It can continuously and stably dissipate heat under long-term full-load and occasional peak-load conditions, effectively avoiding equipment overheating and performance attenuation. The fully sealed anti-leakage structure isolates external moisture, dust and corrosive substances, preventing insulating oil deterioration and internal insulation aging. This structural design enables long-term maintenance-free operation and greatly extends the service life of the 3 phase oil immersed distribution transformer.
2.4 Strong Safety & Excellent Grid Adaptability
This industrial-grade 20kV oil immersed transformer adopts reinforced insulation and professional short-circuit protection design, with strong lightning impulse resistance, overvoltage resistance and short-circuit fault resistance. It can effectively resist instantaneous grid surge and load impact, ensuring stable power supply under complex grid conditions. The oil immersed structure has excellent arc extinguishing performance, which can quickly eliminate internal tiny faults and reduce equipment failure risks. In addition, the equipment features low operating noise, no electromagnetic pollution and strong environmental adaptability, suitable for indoor workshop, outdoor substation and other diverse installation environments.
2.5 Stable Structure & Low Operation Maintenance Cost
Integrated core forming and high-strength metal tank body structure endows the 500kVA/630kVA/800kVA 3 phase transformer with strong mechanical stability and anti-vibration ability. The standardized production process ensures consistent product quality and low failure rate. The reserved detection ports and maintenance interfaces simplify daily oil quality inspection, temperature monitoring and fault troubleshooting. The fully sealed design avoids frequent oil replacement and supplementation, greatly reducing daily operation and maintenance workload and comprehensive use cost for power distribution projects.
3. Core Usage
The core application of the 3 Phase 20kV 440V Class Oil Immersed Transformer is medium-to-low voltage power conversion and grid power stabilization in power electricity distribution systems. As a key medium-voltage step-down transformer, it mainly converts 20kV industrial medium-voltage grid power into standard 440V three-phase low-voltage power that meets the operating specifications of industrial equipment, electrical machinery and power distribution devices.
This multi-grade oil immersed power transformer can balance three-phase load, stabilize terminal output voltage, reduce power transmission loss, and improve the overall power supply quality and reliability of the power distribution system. It solves the problem of voltage level mismatch between medium-voltage power grids and low-voltage industrial equipment, provides continuous, safe and stable power guarantee for industrial production and power grid operation, and undertakes the core power transmission and distribution tasks of regional power supply, load adjustment and power safety protection.
4. Application Scenarios
4.1 Industrial Park Power Distribution
The 500kVA, 630kVA and 800kVA 3 phase 20kV 440V oil immersed transformers are widely used in intensive industrial parks, manufacturing bases, processing factories and industrial zones. They provide stable 440V power supply for production machinery, automated production lines, workshop electrical equipment and auxiliary power facilities, adapting to long-term high-load continuous production demands of industrial enterprises. Multiple capacity grades can flexibly match power demands of small, medium and large industrial workshops.
4.2 Urban & Rural Power Grid Construction & Renovation
This class oil immersed electricity transformer is an essential core equipment for urban and rural medium-voltage power grid reconstruction, community power distribution upgrading and township power supply station construction. It is applied to terminal voltage transformation and power distribution of 20kV regional power grids, effectively improving grid power supply capacity, solving unstable voltage and insufficient power supply in old grid areas, and meeting the growing power consumption demand of urban and rural residents and regional commercial facilities.
4.3 Outdoor Substation & Municipal Engineering
Suitable for outdoor box substations, regional power supply substations, municipal water pump stations, sewage treatment plants and urban infrastructure power distribution projects. The excellent weather resistance and sealed protection performance enable the transformer to operate stably in outdoor open-air environments with complex temperature and humidity changes, providing reliable power support for municipal public facilities and outdoor power distribution systems.
4.4 Commercial & Public Facility Power Supply
It can be used for power distribution and voltage conversion of large commercial complexes, logistics parks, campus power stations, hospital power supply systems and public service facilities. The stable 440V low-voltage output ensures the normal operation of central air conditioning, power distribution cabinets, mechanical and electrical equipment, meeting the high-standard power supply requirements of public and commercial places for safety and stability.
4.5 Special Industrial & Engineering Scenarios
This 20kV to 440V oil immersed transformer is also applicable for power supply support of construction sites, mining areas, new energy matching projects and temporary large-scale engineering projects. The 500kVA–800kVA multi-capacity options can cope with temporary peak power loads and long-term fixed power distribution demands, with strong universality and scene adaptability for various special power consumption environments.
5. FAQ (Frequently Asked Questions)
5.1 How to choose between 500kVA, 630kVA and 800kVA 20kV 440V oil immersed transformers?
Capacity selection depends on the actual operating load, peak power demand and future load growth margin of the application scenario. The 500kVA 3 phase oil immersed transformer is suitable for small factories, community supporting power distribution and small municipal projects with relatively low stable load. The 630kVA model is the most versatile option, ideal for most standard industrial workshops, conventional park power distribution and urban grid terminal transformation projects. The 800kVA high-capacity transformer is recommended for medium-large manufacturing enterprises, high-load industrial zones and engineering scenarios with frequent peak load fluctuations and future power expansion demands.
5.2 What are the core advantages of 20kV 440V class oil immersed transformers compared with conventional 400V models?
Different from traditional 20kV/400V distribution transformers, this 20kV to 440V oil immersed power transformer provides higher standard low-voltage output, which is more compatible with international industrial 440V three-phase electrical equipment and overseas power system standards. It features wider voltage adaptation range, stronger load impact resistance and lower operational loss under high-load working conditions. The multi-grade capacity design covers more application scenarios, and the oil immersed cooling structure ensures more stable long-term operation, making it more suitable for industrial international power distribution and high-standard engineering projects.
5.3 What are the key daily maintenance points for this 3 phase oil immersed electricity transformer?
This sealed class oil immersed transformer features low maintenance design with simple daily management. Users need to regularly check the insulating oil level and oil quality to prevent oil leakage and deterioration caused by long-term operation. It is necessary to monitor the operating temperature and running noise of the equipment to eliminate abnormal overheating and mechanical noise in time. Regular inspection of high and low voltage bushing insulation and terminal tightness can avoid poor contact and insulation aging. It is recommended to conduct a comprehensive electrical performance test every 1–2 years in accordance with power industry standards to ensure long-term safe and efficient operation of the transformer.
