3150kva 35/0. 4KV Oil Immersed Distribution Transformers
3150kva 35/0. 4KV Oil Immersed Distribution Transformers
1. Product Description
3150kva 35/0.4KV Oil Immersed Distribution Transformers are high-capacity three-phase medium-voltage power distribution equipment widely deployed in modern industrial power grids and municipal power supply systems. Designed with a standard 35kV high-voltage input and 0.4kV low-voltage output ratio, this 3150kVA oil immersed transformer serves as a core step-down conversion unit for large-load power distribution projects. Manufactured strictly in compliance with IEC 60076 international standards and GB/T 6451 national power transformer specifications, it adopts mature oil-immersed insulation and natural oil circulation cooling technology, delivering stable and continuous power conversion for high-power electrical systems.
This 35kV class oil immersed distribution transformer features an optimized integral structure with high-permeability low-loss silicon steel sheets for the iron core and high-purity oxygen-free copper windings for conductive components. The fully sealed corrugated steel tank design eliminates the need for an oil conservator, using the elastic deformation of the tank wall to adapt to insulating oil volume changes caused by temperature fluctuations. This professional structural design effectively prevents internal insulation aging, moisture ingress and dust contamination, greatly improving operational stability. As a mainstream high-capacity distribution transformer, it is specially engineered to handle long-term full-load and heavy-load operation, perfectly matching the power demand of large industrial parks and centralized power supply stations.
2. Core Product Features
The 3150kva 35/0.4KV Oil Immersed Distribution Transformer stands out in high-capacity power distribution scenarios with its low energy loss, strong overload resistance, high safety and low maintenance performance. It solves the common problems of high power consumption, poor stability and short service life of traditional large-capacity transformers, becoming a reliable choice for medium and high voltage power grid construction.
2.1 Ultra-Low Loss and High Energy-Saving Performance
Adopting advanced full-mitered step lap core stacking technology and high-quality grain-oriented silicon steel materials, this 3150kVA 35kV transformer significantly reduces no-load loss, load loss and no-load current. The optimized winding layout balances ampere-turn distribution and minimizes magnetic leakage, ensuring high energy conversion efficiency under long-term heavy-load operation. Compared with conventional old-fashioned transformers of the same capacity, it cuts down comprehensive operating power consumption effectively, fully meeting the energy-saving and low-carbon requirements of modern power distribution networks.
2.2 Excellent Heat Dissipation and Strong Overload Capacity
Equipped with a standard ONAN oil natural air natural cooling system, the equipment relies on natural circulation of high-purity insulating oil and external air convection for passive heat dissipation. The large-area corrugated radiator structure ensures uniform and efficient heat exchange, avoiding local overheating during peak load operation. With a reasonable insulation temperature rise design, this oil immersed distribution transformer supports short-term overload operation and adapts to unstable load fluctuations in industrial production and grid peak periods.
2.3 Fully Sealed Maintenance-Free Structure
The fully welded sealed tank body completely isolates internal windings and insulating oil from external air, rainwater and dust. This structure prevents insulating oil oxidation and moisture absorption, eliminating frequent oil replacement and internal cleaning work required by traditional open-type transformers. The precision-machined flange connections effectively prevent oil leakage, realizing long-term maintenance-free operation in daily use and greatly reducing later operation and maintenance costs for users.
2.4 Superior Stability and Short-Circuit Resistance
The high-voltage windings adopt multi-layer cylindrical structure while low-voltage windings adopt high-strength layer winding technology, with uniform internal stress and high mechanical strength. This structural design greatly enhances the transformer’s short-circuit withstand capability and anti-vibration performance, effectively resisting impact damage caused by grid short-circuit faults and sudden load changes. The Dyn11 vector group design ensures balanced three-phase current and stable 0.4kV low-voltage output, restraining grid harmonic interference and voltage fluctuation.
2.5 Wide Environmental Adaptability and Long Service Life
The overall tank body adopts anti-corrosion and weather-resistant spraying treatment, adapting to outdoor open-air installation, high-temperature, low-temperature and humid harsh environments. All internal insulating materials are high-temperature resistant and aging-resistant, with stable electrical performance. Under standard installation and operating conditions, the service life of this 35/0.4kV oil immersed distribution transformer can exceed 30 years, with extremely low failure rate and high operational reliability.
3. Core Usage
As a key high-capacity power transformation device in medium-voltage power distribution systems, the 3150kva 35/0.4KV Oil Immersed Distribution Transformer mainly undertakes the core task of stepping down 35kV medium-voltage grid electricity to 0.4kV industrial and civil low-voltage power. It acts as a critical connection link between medium-voltage transmission lines and terminal high-power electrical equipment, responsible for regional centralized power distribution, voltage conversion and load balancing.
In practical power system operation, this large-capacity oil immersed transformer effectively solves the problems of insufficient power supply capacity and excessive line loss in large-scale power supply areas. It stabilizes terminal power supply voltage, optimizes regional power grid load distribution, and improves the overall power supply quality and operational efficiency of the distribution network. In addition, it can support centralized power conversion for new energy power generation systems, complete grid-connected voltage matching for large photovoltaic and wind power projects, and realize efficient utilization and stable transmission of clean energy.
4. Application Scenarios
Benefiting from its large load capacity, stable performance and strong environmental adaptability, the 3150kVA 35/0.4kV oil immersed distribution transformer is widely used in high-power demand scenarios such as large industrial manufacturing, new energy power stations, urban grid upgrading and comprehensive park power supply.
4.1 Large Industrial Manufacturing Parks
It is the preferred power distribution equipment for large chemical plants, metallurgical factories, machinery manufacturing bases and mining industrial parks. These scenarios have long-term high-load power demand, and the 3150kVA high-capacity transformer can stably support the continuous operation of large production lines, heavy mechanical equipment and industrial auxiliary electrical systems, ensuring uninterrupted industrial power supply.
4.2 Large-Scale New Energy Power Projects
Widely applied in centralized photovoltaic power stations, onshore wind farms and energy storage power plant supporting projects. It converts the collected medium-voltage electric energy generated by new energy equipment into standard 0.4kV low-voltage power for on-site equipment use or grid-connected transmission, solving the problem of unstable power output and difficult centralized distribution of clean energy.
4.3 Urban and Rural Power Grid Upgrading and Substation Construction
Suitable for regional main substation power distribution, urban high-load commercial district power supply and rural large-area power grid renovation projects. It effectively improves the power supply capacity of regional power grids, solves the problem of power supply shortage in peak power consumption periods, and guarantees stable power supply for urban residents, commercial complexes and public facilities.
4.4 Infrastructure and Large Public Projects
Matched with large airport hubs, railway transit projects, water conservancy engineering facilities and large data center power supply systems. These key infrastructure projects require high stability and continuity of power supply, and this high-reliability oil immersed distribution transformer can provide long-term stable high-capacity power support for key public equipment and intelligent systems.
5. FAQ
5.1 What makes the 3150kVA 35/0.4kV oil immersed transformer different from conventional small and medium-capacity transformers?
This 3150kVA high-capacity distribution transformer is specially designed for heavy-load centralized power supply scenarios. Compared with 1000kVA, 1600kVA and other medium and small-capacity models, it has larger load bearing capacity, stronger short-circuit impact resistance and more stable full-load operation performance. Its optimized heat dissipation and insulation structure can adapt to long-term 24-hour uninterrupted heavy-load operation, while small and medium-capacity transformers are prone to overheating and performance attenuation under long-term high load. It is more suitable for large industrial parks and regional main power distribution stations with high power demand, with higher power supply efficiency and operational stability.
5.2 Is regular oil replacement required for this fully sealed oil immersed distribution transformer?
Thanks to the fully sealed corrugated tank structure, this 35kV oil immersed transformer realizes isolated operation of internal insulating oil and external environment, with extremely slow oil aging speed. Unlike traditional open-type transformers that require annual oil testing and replacement, this model only needs routine visual inspection of oil level and tank tightness in daily operation. Under normal outdoor and industrial operating environments, the insulating oil can maintain stable performance for 8–10 years, which greatly reduces long-term maintenance investment and equipment downtime loss for users.
5.3 What is the optimal load rate for the 3150kVA transformer in daily operation?
The optimal operating load rate of this 3150kVA 35/0.4KV oil immersed distribution transformer is controlled between 70% and 85%. Within this range, the equipment balances energy-saving efficiency and service life, with the lowest comprehensive operation loss. It can withstand short-term overload operation of 110%–120% to cope with peak power consumption impact, but long-term full-load or overload operation is not recommended. Reasonable load matching can effectively avoid accelerated insulation aging and abnormal equipment wear, ensuring long-term safe and stable operation of the power distribution system.
