3 Phase 10kV 400V Oil Immersed Transformer 250kVA 315kVA 400kVA with 11kV Output
3 Phase 10kV 400V Oil Immersed Transformer 250kVA 315kVA 400kVA with 11kV Output & 35kV Adaptable Class Step Transformer
1. Product Description
This three-phase oil immersed step transformer is a multi-specification universal power distribution equipment tailored for medium and low voltage power grid systems, covering three mainstream rated capacities of 250kVA, 315kVA and 400kVA to meet differentiated terminal power load demands. As a versatile class step electricity transformer, it supports multiple voltage level matching, including standard 10kV high input, compatible 35kV grid adaptation, and dual optional output of 400V and 11kV, perfectly adapting to diverse power distribution and voltage conversion scenarios in civil, commercial and industrial fields.
Manufactured strictly in accordance with IEC 60076 international standards and GB power industry specifications, this 3 phase 10kV 400V oil immersed transformer adopts high-purity oxygen-free copper windings and high-performance cold-rolled grain-oriented silicon steel core. The optimized electromagnetic structure effectively reduces no-load loss and load loss, realizing energy-saving and stable voltage conversion. Equipped with a fully sealed oil tank structure and vacuum oil injection technology, it takes high-quality transformer oil as insulation and heat dissipation medium, supporting reliable ONAN natural oil cooling operation for long-term outdoor and indoor use. Different from single-voltage and single-capacity conventional transformers, this multi-functional step power transformer integrates 35kV grid adaptability, 10kV main input, 400V low-voltage terminal output and 11kV medium-voltage output functions, with flexible tap adjustment to calibrate voltage deviation. It is a cost-effective, multi-scene adaptable oil immersed distribution transformer widely used in global medium and low voltage power grid projects.
2. Core Product Uses
The core function of this 250kVA/315kVA/400kVA three-phase class step electricity transformer is to complete safe, efficient and flexible voltage step conversion and power distribution in medium and low voltage power systems. It mainly undertakes two core power conversion tasks: stepping down 10kV or adapted 35kV medium-voltage grid power to standard 400V low voltage for terminal equipment power supply, and converting medium-voltage power to stable 11kV output for secondary power distribution and regional power transfer.
In daily grid operation and industrial power supply, this multi-voltage oil immersed transformer can effectively stabilize system voltage, suppress line voltage drop and power fluctuation caused by load changes and long-distance power transmission. It greatly reduces power transmission and distribution loss, improves the energy utilization efficiency of regional power grids, and cuts down long-term operating power consumption costs. With multiple capacity options, it can precisely match light, medium and conventional industrial loads, avoiding energy waste caused by excessive capacity or power supply shortage caused by insufficient capacity. In addition, the equipment has excellent short-circuit resistance and overload tolerance, which can cope with instantaneous grid faults and peak power consumption impact, protect downstream electrical equipment from damage, and ensure continuous, stable and safe power supply for power distribution terminals. Its 35kV grid compatibility also enables it to adapt to old grid renovation and voltage level upgrading scenarios, realizing flexible power grid docking and efficient power scheduling.
3. Main Application Scenarios
3.1 Urban and Rural Residential Power Distribution Grids
This 3 phase 10kV 400V oil immersed transformer with 250kVA, 315kVA and 400kVA specifications is the mainstream core equipment for urban community and rural power grid distribution. The 250kVA model is suitable for small residential clusters and scattered rural household power supply; the 315kVA universal model adapts to most ordinary residential communities and rural centralized power consumption scenarios; the 400kVA high-capacity model meets the power demand of densely populated residential areas and multi-story building communities. It converts 10kV grid power into 400V civilian power for daily household electricity, community lighting and public facility power supply, and can output 11kV medium voltage for regional secondary power grid transfer, effectively improving the coverage and stability of urban and rural power supply.
3.2 Small and Medium Industrial Factory Power Supply
It is widely applied in light industry processing factories, small machinery workshops, food processing plants and small manufacturing enterprises. Most small and medium industrial production equipment and auxiliary facilities use 400V three-phase power supply, and the three capacity models of this oil immersed step transformer can fully match different industrial load levels. For small industrial parks requiring secondary power distribution, the 11kV stable output can support regional power transfer and decentralized power supply, while the 35kV grid adaptability enables it to adapt to industrial park grid upgrading and reconstruction projects, ensuring stable operation of industrial production lines.
3.3 Commercial and Public Facility Power Distribution
This multi-spec class step electricity transformer is suitable for power supply supporting shopping malls, supermarkets, campus buildings, hospital outpatient departments and municipal public facilities. These public scenarios have stable and continuous medium and low power load demands. The low-noise operation and high safety performance of the oil immersed transformer fully meet the power supply safety and environmental protection requirements of densely populated public areas. It can provide stable 400V power for daily office, lighting and electrical equipment, and use 11kV output to realize internal regional power scheduling of large public facilities, improving the flexibility of public power distribution systems.
3.4 Distributed New Energy Power Generation Matching
It serves as supporting power transformation equipment for small and medium-sized distributed photovoltaic power stations and rural wind power generation projects. New energy power generation has intermittent and fluctuating characteristics, and this oil immersed distribution transformer can stabilize power quality through efficient voltage conversion. It can step down 10kV/35kV grid power for new energy station auxiliary power supply, and convert new energy generated power into standard 400V or 11kV voltage for local power consumption and grid-connected transmission, effectively improving new energy utilization rate and grid-connected power quality.
3.5 Old Grid Renovation and Voltage Upgrading Projects
Thanks to its 35kV grid compatibility and multi-voltage output design, this universal step transformer is ideal for old urban and rural power grid renovation and voltage level upgrading projects. Many old regional power grids have mixed 10kV and 35kV line layouts, and traditional single-voltage transformers are difficult to adapt. This equipment can flexibly match different voltage level lines, support 400V terminal power supply and 11kV secondary distribution, effectively solving the problem of equipment mismatch in grid renovation, reducing project transformation cost and improving grid operation efficiency.
4. Core Product Features
4.1 Multi-Capacity & Multi-Voltage Universal Adaptability
This series of three-phase oil immersed step transformers covers 250kVA, 315kVA and 400kVA three mainstream capacities, covering light, medium and conventional terminal power load scenarios. It breaks the limitation of single voltage specification of traditional transformers, with flexible adaptation to 10kV main input and 35kV grid environment, and dual optional output of 400V low voltage and 11kV medium voltage. Users can select corresponding capacity and voltage matching mode according to on-site grid conditions and load demand, realizing one machine for multiple purposes, greatly improving equipment versatility and reducing project procurement and inventory costs.
4.2 Low Loss & High Energy-Saving Performance
Adopting high-quality low-loss grain-oriented silicon steel core and high-purity oxygen-free copper windings, combined with optimized three-phase balanced winding layout and core lamination process, this oil immersed distribution transformer effectively reduces hysteresis loss, eddy current loss and load loss. All energy efficiency indicators are better than national and international industry standards. Whether operating in 10kV or 35kV grid environment, and outputting 400V or 11kV voltage, it maintains low energy consumption operation, significantly reducing long-term power transmission loss and user operating electricity costs, belonging to high-efficiency energy-saving power distribution equipment.
4.3 Fully Sealed Structure & High Operational Safety
The whole machine adopts integrated fully sealed steel oil tank and multi-layer composite sealing structure, equipped with advanced vacuum oil injection technology to completely remove internal air and moisture. It effectively prevents transformer oil oxidation, deterioration and water absorption, avoids common faults such as oil leakage, insulation aging and partial discharge. The high-grade oil-paper insulation system has excellent high-voltage resistance, lightning impulse resistance and overvoltage protection performance, which can adapt to long-term operation in 10kV and 35kV medium-voltage grid environments, ensuring safe and stable operation of power distribution systems.
4.4 Stable Voltage Conversion & Strong Anti-Interference Ability
Through precise turns ratio calibration and electromagnetic parameter optimization, this class step electricity transformer realizes accurate and stable voltage step conversion, with extremely low output voltage fluctuation rate. It can effectively suppress external electromagnetic interference, grid harmonic and line voltage drop in the power conversion process, ensuring stable 400V and 11kV output power quality. The built-in voltage fine adjustment function can calibrate voltage deviation caused by grid load changes and line loss, adapting to complex and variable on-site power grid operating conditions.
4.5 Strong Environmental Adaptability & Wide Application Range
Supporting ONAN natural oil cooling mode, the equipment has efficient circulating heat dissipation performance, stable temperature rise control under full-load and short-term overload operation. The external anti-corrosion and rust-proof treatment enables it to adapt to high temperature, low temperature, rainy, dusty and humid complex environments, suitable for outdoor pole-mounted, outdoor substation and indoor distribution room installation. It can operate stably in both urban standardized grid environments and rural complex power supply scenarios, with extremely wide scene adaptability.
4.6 Low Maintenance & Long Service Life
Benefiting from the fully sealed maintenance-free design, this multi-functional oil immersed transformer does not require frequent oil replacement and internal cleaning maintenance. High-quality raw materials and mature manufacturing process endow internal components with strong anti-aging and anti-corrosion capabilities. The equipment has stable long-term operating performance, low failure rate and few vulnerable parts, greatly reducing daily maintenance workload and later operation costs. The design service life can reach up to 30 years, with excellent comprehensive cost performance for long-term grid operation and industrial power supply.
5. Frequently Asked Questions (FAQ)
5.1 How to select 250kVA, 315kVA and 400kVA capacity models for practical projects?
The three capacity models are matched with different load scenarios according to actual power consumption demand. The 250kVA oil immersed transformer is suitable for small scattered loads such as single village power supply, small community units and simple temporary engineering power supply. The 315kVA model is the most widely used universal specification, perfectly matching ordinary rural residential clusters, small shops and light industrial workshops with medium and low load demand. The 400kVA high-capacity model is applicable to densely populated residential areas, medium-sized processing factories and large public facilities with concentrated power consumption and high load demand. Selecting the corresponding capacity according to on-site peak load can effectively avoid equipment overload operation and idle capacity waste.
5.2 What is the difference and application of 400V and 11kV dual output voltages?
The 400V low-voltage output is the most commonly used terminal power supply voltage, mainly used for direct power supply of civilian households, commercial equipment and small industrial mechanical devices, meeting daily low-voltage power consumption needs. The 11kV medium-voltage output is used for secondary power distribution and regional power transfer, suitable for internal power scheduling of industrial parks, large public facilities and regional grid interconnection. In addition, the equipment can adapt to 35kV grid environment and 10kV conventional grid docking, which can flexibly cope with grid voltage differences in old grid renovation projects. Users can switch the output voltage mode through internal tap adjustment according to project power distribution design requirements.
5.3 Is this 3-phase step electricity transformer suitable for long-term outdoor unattended operation?
Absolutely suitable. This series of 10kV/35kV adaptable oil immersed transformers is professionally optimized for outdoor working conditions. The fully sealed anti-corrosion oil tank structure effectively resists rain, dust, moisture and ultraviolet aging, avoiding oil leakage and insulation failure caused by long-term outdoor exposure. The stable ONAN natural cooling system ensures continuous heat dissipation during 24-hour full-load operation, with low operating noise and strong weather resistance. It has passed strict lightning protection and overvoltage resistance tests, which can cope with thunderstorm, high temperature and low temperature extreme weather. With low failure rate and maintenance-free characteristics, it fully meets the unattended long-term operation requirements of outdoor substations, rural power grids and field power supply projects.
