No Load Tap Changer Transformer Step Down Step up 250kVA 500kVA Three Phase Oil Immersed Transformer
1. Product Overview
The No Load Tap Changer Transformer Step Down Step up 250kVA 500kVA Three Phase Oil Immersed Transformers are high-performance medium-voltage power conversion equipment designed for industrial and commercial power distribution systems. Available in two mainstream rated capacities of 250kVA and 500kVA, this series of three-phase oil immersed transformers supports dual voltage conversion functions of step-up and step-down, perfectly adapting to diverse power voltage matching demands in power grids, industrial production, and new energy power generation scenarios. Equipped with a no-load tap changer, the device realizes precise voltage adjustment under power-off conditions, effectively solving the problems of grid voltage fluctuation and mismatched equipment voltage requirements.
Manufactured in strict accordance with IEC 60076 international standards and national power industry specifications, these oil immersed distribution transformers adopt fully sealed oil-immersed cooling structure and high-quality grain-oriented silicon steel core materials. Different from on-load tap changer transformers, the no-load tap changer design simplifies equipment structure, reduces failure rate, and lowers daily operation and maintenance costs. As mainstream medium-capacity power transformers, 250kVA and 500kVA three-phase oil immersed models have stable performance, strong environmental adaptability, and are widely recognized as ideal power conversion equipment for urban and rural power grid renovation, factory power supply, and temporary power engineering projects.
2. Core Product Features
2.1 Reliable No-Load Voltage Regulation Performance
Featured with a professional no-load tap changer, this step-up and step-down transformer completes voltage tap adjustment in a power-off state, ensuring zero safety risk during regulation operation. The tap adjustment range covers conventional medium-voltage grades, which can effectively compensate for voltage deviation caused by long-distance power transmission and load changes. This voltage regulation mode avoids operational failures and power quality fluctuations caused by live adjustment, greatly improving the stability of power supply for terminal equipment, and is more suitable for fixed voltage matching scenarios with non-frequent regulation demands compared with on-load regulation transformers.
2.2 High-Efficiency Energy-Saving Structure Design
The 250kVA and 500kVA three-phase oil immersed transformers adopt high-permeability cold-rolled grain-oriented silicon steel sheets as the core material, which significantly reduces no-load loss and load loss, achieving excellent energy-saving effects. The optimized core winding structure minimizes magnetic leakage and heat generation during equipment operation, improving overall power transmission efficiency. The high-purity oxygen-free copper winding ensures good electrical conductivity and strong current-carrying capacity, avoiding overheating and power attenuation under long-term full-load operation. While meeting industrial power supply standards, the low-loss design effectively reduces long-term operating energy consumption and operation costs for users.
2.3 Durable Oil-Immersed Sealed Structure
As classic oil immersed power transformers, the products adopt a fully sealed corrugated tank structure, which isolates internal insulating oil and windings from external air and moisture. This design prevents insulating oil aging, oxidation and moisture absorption, avoids insulation performance degradation, and greatly extends the service life of the transformer. The internal high-heat-capacity insulating oil can quickly absorb and dissipate operating heat, realizing efficient circulating cooling, ensuring stable operation of the equipment under high load and high-temperature ambient conditions. The fully sealed structure also reduces oil leakage risks and lowers daily maintenance frequency.
2.4 Strong Environmental Adaptability and Safety
This series of step-down and step-up transformers adapts to a wide range of ambient temperatures, stably operating in the temperature range of -25℃ to +40℃, and can adapt to harsh outdoor environments such as high humidity, dust and low temperature. The overall structure is compact and firm, with all fasteners specially treated for anti-loosening and anti-corrosion, enhancing mechanical stability and short-circuit resistance. It is equipped with multiple safety protection mechanisms such as over-current, over-temperature and short-circuit protection, which can quickly cut off power in case of abnormal conditions to protect terminal power equipment and grid safety. The explosion-proof and anti-aging design meets outdoor overhead distribution and floor-mounted installation requirements.
2.5 Flexible Dual Voltage Conversion
Integrating step-up and step-down dual functions, the three-phase transformer can flexibly convert high-voltage grid electricity to low-voltage industrial and civilian power, and also step up low-voltage power generated by new energy equipment to meet grid-connected and long-distance transmission requirements. The 250kVA model is suitable for small and medium-scale power demand scenarios, while the 500kVA model meets large-load industrial power supply needs, covering most medium and small power distribution application scenarios.
3. Core Uses
The 250kVA 500kVA three phase oil immersed transformer with no load tap changer is mainly used for voltage conversion, power distribution and power quality optimization in three-phase AC power systems. Its core function is to realize safe and stable step-up and step-down conversion of medium and low voltage power, solve the mismatch between grid voltage and electrical equipment rated voltage, and ensure the safe and efficient operation of power equipment.
In power transmission and distribution links, this no-load tap changer transformer adjusts system voltage through no-load tap shifting, stabilizes terminal voltage of power grids, and improves power supply quality. In new energy power generation systems, it steps up the low-voltage electric energy generated by photovoltaic power stations and wind power equipment to standard grid voltage, realizing grid-connected power transmission. In industrial production scenarios, it converts high-voltage grid power to low-voltage power suitable for mechanical equipment, supporting continuous and stable operation of industrial loads. In addition, it can also be used for voltage stabilization and power distribution of temporary power projects, rural power grid upgrading, and commercial building power supply systems, effectively improving the utilization rate of electric energy and reducing power loss.
4. Main Application Scenarios
4.1 Urban and Rural Power Grid Renovation Projects
It is the core distribution equipment for rural power grid upgrading and urban community power grid reconstruction. The 250kVA oil immersed transformer is suitable for residential communities, rural villages and small-town power distribution with medium and small power consumption, while the 500kVA model is applied to urban street power supply and densely populated community power distribution. Through no-load voltage regulation, it solves the problems of low voltage in rural peak power consumption and unstable urban grid voltage, improving the reliability of civilian power supply.
4.2 Industrial Factory Power Supply System
Widely used in manufacturing factories, processing plants, mining enterprises and other industrial scenarios. Industrial production equipment has high requirements for power voltage stability, and this three-phase step-up step-down transformer can convert 10kV/11kV medium voltage electricity to 0.4kV low voltage industrial power, meeting the power demand of mechanical equipment, production lines and electrical control systems. Its strong overload resistance and stable operation performance can adapt to frequent load changes in industrial production, ensuring continuous production without power failure.
4.3 New Energy Power Generation and Grid Connection
Suitable for distributed photovoltaic power stations, small and medium-sized wind farms and energy storage power stations. The low-voltage electric energy generated by new energy units is boosted by the 250kVA and 500kVA oil immersed transformers to reach the grid access standard, realizing efficient grid-connected power transmission and long-distance power transportation. The energy-saving and low-loss characteristics of the equipment effectively reduce power loss during new energy power transmission and improve new energy power utilization efficiency.
4.4 Temporary Engineering Power Supply
It is widely used for temporary power supply of construction sites, road and bridge engineering, field exploration projects and emergency power guarantee projects. The equipment has compact structure, convenient installation and strong environmental adaptability, and can quickly build temporary power distribution systems to provide stable three-phase power for construction machinery, field equipment and temporary office facilities.
4.5 Commercial and Public Facility Power Distribution
Applicable to shopping malls, schools, hospitals, office buildings and other public places and commercial buildings. These places have stable and continuous power demand, and the oil immersed transformer can stably output standard low-voltage power, ensure the normal operation of lighting, air conditioning, elevator and electrical equipment in public facilities, and provide safe and reliable power guarantee for commercial and public service scenarios.
5. FAQ (Frequently Asked Questions)
5.1 What is the difference between no-load tap changer transformer and on-load tap changer transformer?
The core difference lies in the voltage regulation operating conditions and application scenarios. The no load tap changer transformer must complete tap adjustment under power-off state, with simple structure, low failure rate and low manufacturing and maintenance costs, which is suitable for scenarios with stable load and infrequent voltage regulation such as conventional power distribution, industrial fixed power supply and new energy grid connection. On the contrary, on-load tap changer transformers can adjust voltage with load, which is suitable for key power supply scenarios with frequent voltage fluctuation and uninterrupted power supply requirements, but the equipment cost and later maintenance cost are higher. For most conventional 250kVA and 500kVA medium-capacity power distribution scenarios, no-load voltage regulation models have higher cost performance.
5.2 What are the installation and operating environment requirements for 250kVA/500kVA three phase oil immersed transformers?
This series of oil immersed transformers supports outdoor floor-mounted and indoor installed installation modes, with strong environmental adaptability. The applicable ambient temperature range is -25℃ to +40℃, and the relative air humidity should not exceed 90%. It can operate normally in conventional atmospheric environments with dust, slight corrosion and low temperature, but long-term immersion in water and high-corrosion chemical environments should be avoided. In terms of operation, it is necessary to ensure sufficient ventilation and heat dissipation space around the equipment, and regular inspection of insulating oil quality and sealing performance is required. No-load voltage regulation operation must be carried out after complete power failure to ensure construction safety.
5.3 How to choose between 250kVA and 500kVA oil immersed transformers?
Users can select according to actual load power demand and application scenarios. The 250kVA three phase oil immersed step-up/step-down transformer is suitable for small-power demand scenarios, including rural single-village power distribution, small processing factories, small distributed photovoltaic power stations and ordinary residential community power supply, which can fully meet daily low-load power consumption. The 500kVA model is applicable to medium and large load scenarios such as urban community centralized power supply, large manufacturing factories, medium-sized wind and solar power stations, and large construction site temporary power supply. It is recommended to reserve 10%-20% load margin during selection to avoid long-term full-load or overload operation and extend the service life of the transformer.
