30KVA 50KVA 80KVA Voltages 20kV to 400V Oil Immersed Transformer
1. Product Overview
The 30KVA 50KVA 80KVA Voltages 20kV to 400V Oil Immersed Transformer is a compact, high-reliability three-phase medium-voltage distribution transformer tailored for small and medium-capacity power conversion projects. This series of oil-filled power transformers covers three mainstream rated capacities: 30kVA, 50kVA and 80kVA, supporting 20kV medium high-voltage input and standard 400V low-voltage three-phase output. As a widely popular small-capacity electrical transformer, it adopts advanced oil-immersed natural cooling technology and high-precision electromagnetic design, perfectly solving the voltage conversion demand between 20kV medium-voltage power grids and 400V terminal electrical equipment.
Manufactured in full compliance with IEC 60076 and international power industry standards, this 20kV step-down oil immersed transformer uses high-performance CRGO silicon steel core and high-purity oxygen-free copper windings. The fully sealed corrugated oil tank structure effectively isolates external moisture and dust, avoiding insulation aging and oil oxidation. Featuring low no-load loss, stable voltage output and strong environmental adaptability, this energy-saving distribution transformer is the ideal power conversion device for rural power grids, small industrial sites, commercial facilities and distributed power supply projects worldwide.
2. Standard Core Technical Parameters
This 20kV to 400V oil immersed transformer series adopts optimized S11 energy-saving structural design, with diversified capacity options and standardized parameters to adapt to global 20kV medium-voltage grid operating conditions and small-load power supply scenarios.
• Rated Capacity Options: 30kVA, 50kVA, 80kVA (flexible selection for different small and medium power load demands)
• Primary Rated Voltage: 20kV medium voltage input (compatible with 20kV urban, rural and industrial power grid systems)
• Secondary Rated Voltage: 400V three-phase low voltage output (universal standard for industrial and civil low-voltage power supply)
• Working Frequency: 50Hz / 60Hz dual universal, suitable for global power system standards
• Connection Group: Dyn11 (balances three-phase current, suppresses harmonic interference and improves power supply quality)
• Cooling Method: ONAN oil-immersed natural air cooling (low noise, no auxiliary cooling equipment required)
• Insulation Level: 20kV high-grade insulation, excellent lightning impulse resistance and overvoltage protection performance
• Operation Life: Up to 30 years of stable service life under standard operating environment
• Structure Type: Fully sealed maintenance-free structure, corrugated tank for automatic oil volume expansion adjustment
3. Core Product Uses
The 20kV to 400V 30kVA/50kVA/80kVA oil immersed transformer mainly undertakes medium-to-low voltage step-down conversion, power distribution and voltage stabilization work in small-capacity power supply systems. Its core function is to convert high-potential 20kV medium-voltage grid electricity into safe, standard 400V low-voltage power that can be directly used by terminal electrical equipment, realizing safe and efficient power transmission and distribution.
As a key mini distribution electrical transformer, it achieves electrical isolation between medium voltage and low voltage, effectively preventing equipment burnout and circuit faults caused by grid voltage fluctuation and surge. This low-loss oil-filled transformer optimizes three-phase load balance, reduces power transmission loss in small power supply systems, and improves overall power utilization efficiency. It also acts as a stable voltage regulation device for decentralized power supply systems, ensuring continuous and safe power supply for various small-scale power consumption scenarios.
4. Diversified Application Scenarios
Benefiting from its compact size, low energy consumption, flexible capacity selection and strong weather resistance, this 20kV 400V oil immersed transformer series is widely used in various small and medium power supply fields, covering civil construction, light industry manufacturing, municipal infrastructure, new energy and remote area power supply.
4.1 Rural & Residential Power Grid Projects
30kVA, 50kVA and 80kVA capacity models are perfectly suitable for rural power grid renovation, village centralized power supply and suburban residential community power distribution. The 20kV to 400V step-down transformer stably converts grid voltage to meet daily power consumption needs of household lighting, household appliances and community public facilities, solving the problem of insufficient power supply capacity in rural areas.
4.2 Small Industrial & Light Workshop Sites
Ideal for small processing workshops, light industrial factories, mechanical maintenance workshops and small-scale manufacturing bases. This compact oil immersed power transformer provides stable 400V power for small production equipment, motors, welding equipment and industrial control systems, fully meeting the low-load continuous power demand of small industrial scenarios.
4.3 Municipal & Public Infrastructure
Widely applied for street lighting power supply, park facility power supply, rural water pump stations, scenic area supporting power supply and remote monitoring equipment power supply. The maintenance-free 20kV distribution transformer adapts to outdoor long-term operation, providing reliable power guarantee for various public infrastructure with low and medium power consumption.
4.4 Distributed New Energy Power Generation
Suitable for small household photovoltaic power stations, mini wind power generation systems and rural energy storage power supply projects. This energy-saving oil filled transformer converts the 20kV medium-voltage power generated by new energy equipment into standard 400V low-voltage power, realizing efficient grid connection and off-grid power supply for small distributed new energy systems.
4.5 Remote & Isolated Area Power Supply
It is the preferred power conversion equipment for mountainous areas, remote mining sites, field construction bases and isolated rural settlements. With strong environmental adaptability and stable operation performance, the 30/50/80kVA oil immersed transformer can adapt to unstable 20kV line voltage in remote areas and output consistent 400V power to meet basic production and living power demand.
5. Outstanding Product Features
5.1 Multi-Capacity Flexible Matching & Wide Compatibility
This transformer series provides three mainstream capacity options of 30kVA, 50kVA and 80kVA, which can accurately match different small and medium load power demands. The fixed 20kV input and 400V output design covers most 20kV-level power grid standards and terminal low-voltage equipment specifications in various regions. Users can select the corresponding model according to project power consumption, realizing precise power distribution and avoiding equipment capacity waste.
5.2 Ultra-Low Loss & High Energy Saving Performance
Adopting high-quality oriented silicon steel sheet core and optimized seamless core splicing technology, this 20kV oil immersed transformer effectively reduces magnetic leakage and no-load loss. The high-conductivity oxygen-free copper windings lower line resistance and load loss significantly. Compared with traditional old-fashioned transformers, its comprehensive energy-saving efficiency is increased by more than 15%, greatly reducing long-term operating electricity costs for users and meeting global green energy-saving standards.
5.3 Compact Structure & Easy Installation
Different from large industrial transformers, this small-capacity oil-filled transformer features a miniaturized and integrated structural design with small floor space and light overall weight. It supports both outdoor pole-mounted installation and ground-based box-type installation, with simple construction and short installation cycle. It is very suitable for limited-space power distribution scenarios such as rural roads, community corners and small factory areas.
5.4 Fully Sealed Maintenance-Free Design
The fully sealed corrugated oil tank eliminates the need for conservator, preventing external air, moisture and dust from entering the tank. It avoids insulating oil oxidation, deterioration and insulation performance decline. During long-term operation, there is no need for regular oil replacement and internal cleaning, greatly reducing daily maintenance workload and later operation and maintenance costs, realizing truly maintenance-free operation.
5.5 Strong Environmental Adaptability & Stable Operation
The whole machine adopts anti-corrosion, rust-proof and weather-resistant surface treatment, which can adapt to outdoor high temperature, low temperature, rainy, humid and dusty harsh environments. The ONAN natural oil circulation cooling system ensures uniform heat dissipation and no local overheating during long-term continuous operation. Equipped with perfect overcurrent, short-circuit and overvoltage protection functions, the transformer can effectively resist grid impact and ensure long-term stable and safe operation.
5.6 Low Noise & Eco-Friendly Operation
Through optimized core lamination and winding layout design, the electromagnetic vibration and operating noise of the equipment are effectively suppressed. The operating noise is far lower than industry standards, causing no noise pollution to the surrounding living and working environment. The fully enclosed structure prevents transformer oil leakage, with zero environmental pollution during operation, which is green and environmentally friendly, suitable for residential and scenic area power supply scenarios.
6. FAQ (Frequently Asked Questions)
Q1: How to choose the right capacity among 30kVA, 50kVA and 80kVA 20kV 400V oil immersed transformers?
Capacity selection depends on actual total power load and future expansion demand. Under a standard 0.8 power factor, the 30kVA model supports about 24kW effective load, suitable for single village power supply and small public facilities; the 50kVA model drives about 40kW load, ideal for small residential clusters and ordinary light workshops; the 80kVA model carries about 64kW load, applicable for slightly larger processing factories and centralized commercial supporting power supply. It is recommended to reserve 20% capacity margin for long-term operation to avoid frequent overload operation.
Q2: Can this 20kV to 400V oil immersed transformer be installed outdoors for long-term use?
Yes, this series of small-capacity oil immersed distribution transformers is specially designed for outdoor working conditions. The fully sealed anti-aging shell and rainproof, dustproof and moisture-proof structure can resist extreme weather such as strong wind, heavy rain, high temperature and frost. The internal insulating oil and core windings have excellent oxidation resistance and environmental aging resistance, supporting 24/7 uninterrupted outdoor operation. No additional waterproof and dustproof protective equipment is required, which greatly saves project construction and maintenance costs.
Q3: What are the core advantages of 20kV oil immersed transformers compared with 10kV transformers in rural power grid renovation?
20kV medium-voltage power supply has obvious advantages in rural and remote area power supply. The 20kV to 400V oil immersed transformer has higher transmission voltage, which effectively reduces line transmission loss and solves the problem of low terminal voltage caused by long-distance power transmission in rural areas. It covers longer power supply distance and supports wider regional power distribution with fewer equipment stations. In addition, 20kV grid system has stronger overload resistance and higher power supply stability, which is more suitable for rural power grid renovation, remote area power supply and decentralized small-load power consumption scenarios than traditional 10kV transformers.
