50KVA 35/0.4KV Three Phase Oil Immersed Transformers
1. Product Description
The 50KVA 35/0.4KV three phase oil immersed transformer is a standard medium and high voltage power distribution transformer widely used in outdoor power grid construction, industrial power supply and municipal power transformation projects. This 35kV class oil filled distribution transformer adopts classic three-phase four-wire system design, with a rated capacity of 50KVA and a standard voltage ratio of 35kV high voltage input and 0.4kV low voltage output, perfectly matching the voltage conversion demand between 35kV overhead transmission lines and conventional 400V low-voltage power consumption equipment.
Manufactured in full compliance with IEC international electrical standards and GB national power equipment specifications, this low-loss oil immersed power transformer adopts high-permeability cold-rolled silicon steel sheet core and high-strength copper winding. It features a fully sealed oil tank structure and ONAN (oil natural air natural) cooling mode, ensuring stable continuous operation under outdoor natural ventilation conditions. Different from dry-type transformers, this 35kV oil immersed step-down transformer uses insulating oil for heat dissipation and insulation protection, with stronger environmental adaptability and longer service life in outdoor open-air working conditions.
This compact 50KVA three-phase power transformer is designed for decentralized power distribution scenarios. It effectively converts high 35kV grid voltage into safe and usable 0.4kV industrial and civil low voltage, solving the power supply matching problem for small and medium-sized power consumption units far away from centralized distribution stations. It is a mainstream and cost-effective core equipment for rural power grid renovation, factory self-provided power supply and outdoor box-type substation supporting projects.
2. Core Product Purpose
The core purpose of the 50KVA 35/0.4KV three phase oil immersed transformer is to realize safe, stable and efficient voltage step-down and electric energy distribution in 35kV medium-voltage power transmission and distribution systems, providing standardized 400V low-voltage power for terminal power consumption equipment.
As a key step-down device in medium-voltage power grids, the equipment mainly undertakes the task of converting 35kV high-voltage electric energy transmitted by overhead lines into 0.4kV three-phase industrial power and single-phase civil power. It effectively reduces grid transmission voltage to meet the safe operation standards of conventional electrical equipment, lighting systems and mechanical power devices. Meanwhile, this low-loss oil filled transformer can stabilize grid voltage, suppress low-frequency voltage fluctuation, reduce electric energy loss in the power conversion process, and improve the overall power supply quality of terminal lines.
In addition, the 50KVA small-capacity oil immersed distribution transformer plays an important role in decentralized power supply and grid load shunting. It can independently bear the power load of single factory, rural community, communication base station and small engineering project, avoid long-distance low-voltage power transmission loss, and improve the flexibility and coverage of regional power grid power supply. It also has reliable overload protection and insulation protection functions, which can effectively isolate circuit faults and protect the safety of subsequent electrical equipment and power grid lines.
3. Main Application Scenarios
3.1 Rural & Rural Power Grid Renovation Projects
The 50KVA 35/0.4KV three phase oil immersed transformer is the most commonly used power distribution equipment for rural power grid upgrading and remote village power supply. Most rural areas adopt 35kV overhead line power transmission, and the 50KVA medium and small capacity model is perfectly adapted to the scattered and small power load characteristics of rural residents’ living electricity and agricultural production electricity. The outdoor waterproof and anti-corrosion design of the oil immersed transformer can adapt to complex rural outdoor environments such as wind, rain and high temperature, realizing long-term unattended stable power supply for rural areas.
3.2 Small and Medium Industrial Enterprise Power Supply
It is widely applied in small processing factories, workshop production lines, agricultural product processing bases and medium and small mining sites. Many suburban and remote industrial parks are connected to 35kV medium-voltage power grids, and this 35kV/0.4KV step-down transformer can provide stable 0.4kV power for production equipment, workshop lighting, ventilation systems and auxiliary electrical facilities. Its compact structure and low operation cost are very suitable for small and medium-sized enterprises with fixed power load and no ultra-high power consumption demand, effectively solving the problem of insufficient terminal power supply voltage and unstable power supply.
3.3 Outdoor Box-Type Substation & Skid-Mounted Power Station
This oil immersed distribution transformer is a core supporting device for outdoor box-type substations and mobile skid-mounted power stations. With fully sealed structure and strong environmental adaptability, it can be directly installed in outdoor box-type power distribution equipment, suitable for temporary power supply of construction sites, field engineering operations, highway and railway engineering supporting power supply. The 50KVA rated capacity can meet the comprehensive power demand of engineering construction machinery, field office equipment and living facilities, and can adapt to frequent start-stop and intermittent power supply working conditions.
3.4 Communication Base Station & Municipal Auxiliary Facilities
It is also commonly used in outdoor communication base stations, street lamp power distribution systems, landscape engineering power supply, water pump station and sewage treatment station supporting power supply. These municipal and communication facilities have stable and small power load, and the 35/0.4KV three-phase oil immersed transformer can provide continuous and stable low-voltage power, with low daily maintenance workload and high operational reliability, which can meet the long-term continuous operation requirements of public infrastructure.
4. Core Product Features
4.1 Low Loss & High Power Conversion Efficiency
The 50KVA 35/0.4KV three phase oil immersed transformer adopts high-quality oriented silicon steel sheet core and optimized magnetic circuit design, which greatly reduces no-load loss and load loss compared with traditional old-fashioned transformers. The precision wound copper winding ensures low resistance and high conductivity, effectively reducing heat loss during electric energy conversion. The overall power conversion efficiency is significantly improved, which can effectively reduce long-term grid operation energy consumption and bring better energy-saving benefits for power grid operation and enterprise power consumption.
4.2 Excellent Outdoor Environmental Adaptability
Designed for outdoor open-air installation, this 35kV oil filled transformer adopts fully sealed welded oil tank structure, which can effectively prevent rainwater, dust and humid air from entering the interior. The surface is treated with high-temperature anti-corrosion and weather-resistant paint, which can resist ultraviolet radiation, high temperature exposure and low temperature freezing. It can operate stably in the ambient temperature range of -40℃ to +45℃, adapting to various harsh natural environments such as coastal humidity, inland drought and mountain wind erosion, with strong environmental tolerance and wide application range.
4.3 Stable Operation & Strong Fault Resistance
The equipment adopts multi-layer cylindrical high-voltage winding and integral fastening structure, with strong short-circuit resistance and mechanical impact resistance. It can effectively resist instantaneous current impact and voltage fluctuation of the power grid, avoiding coil deformation and equipment damage caused by short-circuit faults. The internal insulating oil has excellent dielectric strength and thermal stability, which can maintain stable insulation performance for a long time and prevent insulation breakdown and leakage accidents. Equipped with standard pressure relief device and oil level monitoring structure, it can effectively avoid equipment failure caused by internal pressure change.
4.4 Simple Structure & Low Maintenance Cost
This compact 50KVA three-phase oil immersed transformer has a simple and reliable overall structure without complex electronic control components. The ONAN natural cooling mode does not rely on auxiliary fans or cooling equipment, reducing failure points and daily energy consumption. In daily operation, it only needs regular oil quality inspection, oil level check and appearance anti-corrosion maintenance, with low maintenance difficulty and low later operation cost. It supports long-term unattended operation, which is very suitable for remote outdoor power supply scenarios inconvenient for frequent manual inspection.
4.5 Safe & Environmentally Friendly Operation
The whole machine adopts sealed oil circulation system, no insulating oil leakage risk, zero pollution to the surrounding soil and environment. The optimized structural design effectively reduces operating noise, realizing low-noise power supply operation, which will not cause noise interference to surrounding residents and working environments. All materials meet environmental protection and flame-retardant standards, with high safety performance, no open fire hazard in normal operation, and compliant with urban and rural power grid environmental protection and safety construction specifications.
5. Frequently Asked Questions (FAQ)
Q1: What load range is the 50KVA 35/0.4KV three phase oil immersed transformer suitable for?
The 50KVA rated capacity corresponds to a stable continuous power supply load of about 40kW actual power, supporting short-term overload operation within 120% rated load. It is mainly suitable for small-power decentralized power supply scenarios such as rural centralized power supply, small factory workshops, outdoor communication base stations and municipal auxiliary facilities. It is not recommended for high-power industrial equipment and long-term full-load overload working conditions. Users can match the equipment according to the actual total power of terminal electrical loads to avoid long-term overload operation affecting the service life of the transformer.
Q2: What are the differences between oil immersed transformer and dry type transformer in 35/0.4KV 50KVA grade?
The 50KVA 35/0.4KV oil immersed transformer adopts insulating oil heat dissipation and insulation, with lower manufacturing cost, better outdoor weather resistance, stronger overload tolerance and longer service life, which is more suitable for outdoor open-air installation, rural power grids and field engineering power supply. Dry-type transformers rely on air cooling, with higher safety in indoor environments, no oil leakage risk, but higher cost, poor outdoor wind and rain resistance, and weaker overload capacity. In actual engineering selection, outdoor decentralized power supply preferentially adopts oil immersed type, while indoor closed power distribution rooms are more suitable for dry-type products.
Q3: What are the key daily maintenance points for this 35kV oil immersed distribution transformer?
Daily maintenance focuses on four core points. First, regularly check the transformer oil level and oil quality to ensure the insulating oil is clear and free of deterioration and precipitation. Second, inspect the oil tank welding seam and sealing parts to eliminate hidden dangers of oil leakage. Third, check the operating temperature and noise, confirm no abnormal overheating and abnormal noise during operation. Fourth, regularly test the insulation resistance of high and low voltage windings to ensure stable insulation performance. For outdoor installed equipment, it is also necessary to clean the radiator dust regularly and check the anti-corrosion coating to avoid rust and corrosion, ensuring long-term stable and safe operation of the equipment.
