35kV Input 20kV/400V Step Up Oil Immersed Transformer
35kV Input 20kV/400V Step Up Oil Immersed Transformer | 1000kVA 1250kVA 1600kVA Three Phase Class 35kV Transformer
1. Product Overview
This three phase class 35kV step up oil immersed transformer series covers three mainstream industrial rated capacities including 1000kVA, 1250kVA and 1600kVA, specially engineered for dual voltage boosting and power distribution requirements in medium and high voltage power systems. As a professional 35kV input oil filled power transformer, the equipment supports flexible voltage conversion from standard 35kV high input voltage to 20kV medium step-up voltage and 400V low terminal voltage, solving the technical pain point of graded voltage lifting and power supplement for new energy stations, industrial parks and remote power grid areas.
Manufactured in strict accordance with IEC 60076 international power transformer standards and national 35kV power equipment specifications, this heavy-duty step up power transformer adopts high permeability low-loss silicon steel core and high-purity copper winding structure. It adopts mature ONAN oil-natural air-natural cooling technology and fully sealed integral oil tank welding process, effectively improving heat dissipation efficiency and internal insulation stability during long-term high-load operation. Different from conventional step-down distribution transformers, this 35kV three phase transformer focuses on step-up voltage conversion, which can lift insufficient grid voltage and convert low-power electric energy into standard 20kV grid-connected voltage and 400V industrial power, making it a core customized device for power grid voltage optimization and new energy grid integration projects.
Designed for outdoor harsh working conditions and long-term unattended operation, the 1000kVA, 1250kVA and 1600kVA capacity grades can accurately match different power generation scales and load demands. The overall structure is compact and sturdy, with low no-load loss, strong short-circuit resistance and stable voltage output. It is compatible with both 50Hz and 60Hz global power frequency standards, and has become a popular high-cost-performance solution for on-site power boosting, grid voltage compensation and distributed power generation grid connection in modern power engineering.
2. Core Product Purposes
The core purpose of the 35kV input 20kV/400V step up oil immersed transformer is to realize safe, stable and efficient voltage boosting, power compensation and hierarchical power distribution in medium and high voltage power systems, effectively solving the problems of low terminal voltage, insufficient power supply and mismatched grid-connected voltage in distributed power generation and remote power supply scenarios.
In actual power system operation, this three phase 35kV step up transformer undertakes two core power conversion tasks. First, it boosts unstable and low-value electric energy to standard 20kV medium voltage, meeting the grid-connected access standards of municipal medium-voltage power grids, realizing effective recycling and grid-connected transmission of scattered electric energy. Second, it converts 35kV high voltage and boosted 20kV voltage into stable 400V three-phase low voltage, providing continuous and compliant power supply for on-site industrial equipment, station auxiliary facilities and daily power consumption devices. This dual-mode step-up and voltage distribution design integrates power lifting and terminal power supply, greatly simplifying the system configuration of power generation and power supply projects.
In addition, this low-loss oil immersed power transformer can effectively stabilize regional grid voltage, compensate line voltage drop caused by long-distance transmission, and suppress grid harmonic interference and voltage fluctuation. With excellent overload tolerance and fault resistance, it can buffer instantaneous current impact caused by power generation fluctuation and grid load changes, isolate circuit hidden dangers, and protect subsequent grid-connected equipment and power distribution devices. The three capacity models of 1000kVA, 1250kVA and 1600kVA can cover small, medium and medium-large power boosting demands, realizing refined power grid operation and improving the overall utilization rate of electric energy.
3. Typical Application Scenarios
3.1 New Energy Power Generation Grid Connection Projects
This 35kV three phase step up oil immersed transformer is widely used in distributed photovoltaic power stations, wind power plants and biomass power generation projects. New energy power generation has the characteristics of fluctuation and intermittency, which easily leads to low output voltage and failure to meet grid-connected standards. The 1000kVA, 1250kVA and 1600kVA transformer models can boost the generated electric energy to standard 20kV grid-connected voltage, realizing safe and efficient grid integration. Meanwhile, the 400V low-voltage output can supply power for on-site inverters, monitoring systems and station auxiliary equipment, fully meeting the self-consumption and grid-connected power demands of new energy stations.
3.2 Remote Area Power Supply & Grid Voltage Compensation
It is an ideal voltage boosting device for remote mountainous areas, rural decentralized power supply areas and border power grid construction projects. Long-distance overhead power transmission is prone to voltage drop and insufficient terminal power supply, resulting in unstable power consumption for residents and equipment. This 35kV input step up transformer can effectively compensate line voltage loss, lift terminal grid voltage to the standard range, and provide stable 20kV medium voltage for regional secondary power distribution and 400V low voltage for civil and industrial power consumption. Its strong environmental adaptability fully adapts to outdoor unattended operation in remote and harsh areas.
3.3 Industrial Park & Factory Self-Power Generation System
Many industrial parks and large manufacturing enterprises are equipped with self-provided generator sets and waste heat power generation systems, which often face the problem of non-compliant power generation voltage. This oil immersed step up transformer can boost self-generated electric energy to 20kV for surplus power grid connection, while outputting 400V industrial voltage to meet on-site production equipment, workshop mechanical devices and auxiliary facility power demands. The 1600kVA high-capacity model is suitable for large industrial power generation systems, while 1000kVA and 1250kVA models perfectly match medium and small factory self-power generation projects.
3.4 Municipal Power Grid Renovation & Substation Upgrading
With the continuous upgrading of urban and rural power grids, many old regional power grids have problems of aging lines and insufficient voltage carrying capacity. This class 35kV step up transformer can be used as supporting equipment for substation upgrading and grid optimization, realizing local voltage boosting and power compensation, improving grid power supply capacity and voltage stability. It can effectively solve the power shortage and voltage instability problems in peak power consumption periods, and is widely applied in urban suburban substation reconstruction and township power grid upgrading projects.
4. Core Product Features
4.1 Professional Step-Up Voltage Conversion Performance
Different from conventional step-down transformers, this three phase oil immersed transformer is professionally optimized for 35kV to 20kV medium voltage boosting and 400V low-voltage distribution. It features accurate voltage ratio control, stable boosting effect and no voltage deviation under variable load operation. It can effectively solve the problem of insufficient voltage of distributed power generation and long-distance transmission lines, realize standard grid connection and stable terminal power supply, and fill the market gap of special step-up transformation equipment for 35kV medium voltage systems.
4.2 Multi-Capacity Flexible Matching & Wide Versatility
Covering 1000kVA, 1250kVA and 1600kVA three mainstream industrial capacities, the transformer series can flexibly match different power generation scales and power load demands. The 1000kVA model is suitable for small distributed power stations and township voltage compensation projects, the 1250kVA model is the most versatile for medium-sized new energy stations and industrial self-power generation, and the 1600kVA high-capacity model meets the high-load operation needs of large industrial parks and large-scale power generation projects. It supports 50Hz/60Hz dual-frequency operation and is compatible with global medium voltage grid standards, with extremely high project adaptability.
4.3 Low Loss & High Energy-Saving Operation
Adopting high-quality low-loss silicon steel sheet core and precision copper winding process, this 35kV step up power transformer effectively reduces no-load loss, load loss and magnetizing current during voltage boosting and power conversion. The optimized magnetic circuit structure avoids magnetic flux leakage, and the overall power conversion efficiency is significantly higher than traditional old-fashioned transformers. Even under long-term fluctuating load operation of new energy power generation, it can maintain efficient and stable operation, effectively reducing power transmission loss and long-term operation costs for power grids and enterprises.
4.4 Excellent Heat Dissipation & Environmental Adaptability
Equipped with fully sealed oil tank and standard ONAN natural cooling system, the equipment has uniform internal heat dissipation and strong continuous operation capability. The fully sealed structure prevents rainwater, dust and humid air from invading the interior, avoiding insulating oil damp and aging. The outer shell adopts weather-resistant and anti-corrosion coating, which can adapt to outdoor open-air, high temperature, low temperature, humid and dusty harsh environments. It supports long-term unattended operation, with low failure rate and strong environmental tolerance, suitable for field power stations and remote grid projects.
4.5 Strong Safety & Fault Resistance
The internal winding adopts integral fastening and multi-layer composite insulation structure, with strong mechanical stability and short-circuit impact resistance. It can effectively resist instantaneous short-circuit current and grid voltage surge caused by power generation fluctuation, avoiding coil deformation and equipment damage. Equipped with standard pressure relief valve, oil level monitoring device and temperature sensing protection system, it can automatically release internal overpressure and monitor operating status in real time, preventing equipment overheating and burnout. The low partial discharge design ensures safe and reliable long-term operation in 35kV medium voltage systems.
4.6 Stable Structure & Low Maintenance Cost
This three phase 35kV step up oil immersed transformer has a mature and reliable internal structure without complex vulnerable electronic components. The fully sealed design avoids frequent oil replacement and internal cleaning, and daily maintenance only requires regular oil quality inspection, oil level calibration and sealing performance check. It has low daily failure rate and long service life, greatly reducing later operation and maintenance manpower and material investment. With flexible specification matching and stable boosting performance, it has outstanding comprehensive cost performance in voltage boosting and grid connection projects.
5. Frequently Asked Questions (FAQ)
Q1: How to select between 1000kVA, 1250kVA and 1600kVA step up transformer models?
Capacity selection depends on actual power generation capacity and on-site load demand. The 1000kVA 35kV step up transformer is suitable for small distributed photovoltaic stations, remote village voltage compensation and small factory self-power generation projects with relatively low and stable power load. The 1250kVA model is the most widely used general-purpose specification, perfectly matching most medium-sized new energy power stations and conventional industrial self-generation grid connection scenarios. The 1600kVA high-capacity model is recommended for large-scale wind and solar power stations, large industrial parks and key grid renovation projects with high power generation and peak load demands. It is advised to reserve 10%–20% capacity margin to adapt to future load growth.
Q2: What is the difference between a step up transformer and a conventional step-down transformer in 35kV power systems?
The core difference lies in voltage conversion direction and application positioning. Conventional 35kV step-down transformers mainly reduce high grid voltage to low voltage for terminal power distribution, suitable for conventional grid power supply scenarios. This 35kV input 20kV/400V step up oil immersed transformer is specially designed for voltage lifting scenarios, which can boost low and unstable power generation voltage to standard 20kV grid-connected voltage to meet grid access requirements, while retaining 400V low-voltage power distribution function. It has higher requirements on winding insulation and voltage stabilization performance, and is more targeted for new energy grid connection and remote grid voltage compensation projects.
Q3: What key maintenance points ensure long-term stable operation of outdoor step up oil immersed transformers?
Daily maintenance focuses on three key aspects to guarantee equipment reliability. First, regularly inspect the oil tank sealing performance, welding seams and gaskets to eliminate insulating oil leakage risks, and check the oil level and clarity to replace deteriorated insulating oil in time, ensuring stable insulation and heat dissipation performance. Second, clean the radiator dust and sundries regularly to keep the natural heat dissipation system unobstructed and prevent equipment overheating during high-load voltage boosting operation. Third, periodically test the winding insulation resistance and verify the stability of 20kV step-up voltage and 400V output voltage, check the integrity of safety protection devices, and troubleshoot abnormal noise and temperature rise to avoid grid connection faults and equipment failure.
