35kV 10.5kV 8000kVA Three-Phase Oil Immersed Distribution Transformer
1. Product Overview
The 35kV 10.5kV 8000kVA Three-Phase Oil Immersed Distribution Transformer is a heavy-duty industrial-grade power distribution device designed for medium-voltage power grid systems. As a mainstream 8000kVA three-phase oil-filled transformer, it features a standard voltage ratio of 35kV high voltage input and 10.5kV low voltage output, serving as core step-down equipment for regional power distribution, industrial power supply and substation power conversion scenarios. This oil immersed power transformer strictly complies with IEC 60076, ANSI and national power industry standards, adopting mature ONAN oil natural air cooling technology to ensure stable continuous operation under full-load and variable-load working conditions.
Manufactured with high-permeability cold-rolled silicon steel sheets and high-purity copper windings, this 35kV medium voltage transformer effectively reduces no-load loss and load loss, achieving excellent energy-saving performance. The whole machine adopts fully sealed tank structure and multi-layer anti-corrosion spraying process, which can adapt to indoor substation and outdoor industrial environment operation. Available in S11, S13 and S20 energy-saving series configurations, the equipment supports 50Hz/60Hz operating frequency and customized impedance parameters, covering most commercial and industrial medium-voltage power conversion demands.
2. Core Functions & Purposes
The primary purpose of this 8000kVA 35kV to 10.5kV distribution transformer is to implement safe, efficient and stable medium-voltage step-down conversion in three-phase AC power systems. It converts 35kV high-voltage grid electricity into standard 10.5kV industrial low-voltage power, providing qualified power supply for downstream power distribution cabinets, high-voltage motors, factory production lines and regional power distribution networks.
As a key energy-saving power transformer for industrial and grid use, it undertakes core tasks such as regional power distribution, grid voltage regulation, load balancing and power loss reduction. In large-scale power consumption scenarios, this three-phase oil immersed transformer can effectively buffer grid voltage fluctuation, isolate circuit faults, improve power supply quality and ensure the continuity and stability of industrial production and regional power supply. Meanwhile, its low-loss design greatly reduces long-term operating power consumption and operation and maintenance costs for power enterprises and industrial users.
3. Typical Application Scenarios
3.1 Industrial and Mining Enterprise Power Supply
This 35kV/10.5kV 8000kVA oil immersed transformer is widely used in large factories, mining enterprises, metallurgical plants, chemical plants and processing bases. These industrial sites have high power load and stable power demand, and the 8000kVA rated capacity can fully meet the centralized power consumption of production equipment, mechanical transmission systems and auxiliary electrical facilities, providing reliable three-phase power support for continuous industrial production.
3.2 Regional Substation and Grid Distribution Projects
It is the preferred distribution equipment for urban regional substations, township power grid reconstruction projects and industrial park power distribution systems. The 35kV medium-voltage incoming line is matched with municipal power grid standards, and the stepped-down 10.5kV voltage can be directly connected to the secondary distribution network, realizing hierarchical power transmission and distributed power supply, effectively improving the coverage and stability of regional power grid operation.
3.3 New Energy Power Station Supporting Facilities
Suitable for supporting power distribution of photovoltaic power stations, wind power plants and energy storage power stations. New energy power generation has intermittent and fluctuating characteristics, and this high-stability three-phase oil-filled transformer can stabilize output voltage, complete power grid access and voltage conversion, and solve the problem of unstable power quality in new energy power generation, ensuring safe grid connection and power transmission of new energy power.
3.4 Infrastructure and Large Commercial Complexes
It can be used for power supporting of large transportation hubs, urban comprehensive commercial complexes, industrial zones and logistics parks. These scenarios have concentrated power loads and high requirements for power supply reliability. The 8000kVA high-capacity design and strong overload resistance of the equipment can cope with peak power consumption pressure and meet the long-term stable power demand of large public infrastructure.
4. Product Core Features
4.1 Ultra-Low Loss & High Energy Efficiency
Adopting high-quality oriented silicon steel core and optimized winding structure, this energy-saving 35kV distribution transformer greatly reduces no-load current and operating loss. Its energy efficiency indicators exceed conventional industry standards, effectively lowering long-term grid operating loss and user electricity cost. The advanced magnetic circuit design avoids magnetic flux leakage, ensuring efficient energy conversion throughout the full load range, which is in line with modern power grid energy-saving and emission reduction upgrading requirements.
4.2 Excellent Operation Stability & Anti-Short Circuit Ability
The transformer coil adopts integral fastening and high-strength insulation skeleton support, with strong mechanical strength and impact resistance. It can withstand instantaneous short-circuit impact and frequent load fluctuation, avoiding coil deformation and insulation damage. The fully sealed oil tank structure prevents external moisture and dust from entering, stabilizes internal insulation performance, and ensures long-term trouble-free operation in complex industrial and grid environments.
4.3 Low Noise & Low Partial Discharge
Through optimized core stacking process and vibration damping structure design, the operating noise of this three-phase oil immersed transformer is effectively controlled at a low level, meeting urban and industrial environmental noise standards. The product strictly controls internal partial discharge value, with low discharge volume and stable insulation performance, effectively delaying equipment aging and extending overall service life, which is very suitable for densely populated urban substations and industrial parks.
4.4 Strong Environmental Adaptability & Durability
The whole machine undergoes shot blasting rust removal and multi-layer anti-corrosion electrostatic spraying treatment, with excellent waterproof, moisture-proof, rust-proof and salt-fog resistance. It can operate stably in high temperature, low temperature, high humidity and dusty industrial environments. The standard ONAN natural cooling system has reliable heat dissipation performance, no need for complex auxiliary cooling equipment, and adapts to long-term continuous outdoor and indoor substation operation.
4.5 Safe & Low Maintenance Design
Equipped with standard oil level gauge, pressure relief valve, temperature sensor and overvoltage protection devices, the equipment can monitor operating status in real time and automatically protect against overload, overvoltage and short circuit faults. The fully sealed oil immersion structure avoids insulating oil deterioration and leakage, greatly reducing daily maintenance frequency and maintenance cost. The overall structure is compact and reasonable, convenient for on-site installation, commissioning and later inspection and maintenance.
4.6 Standardized & Customizable Performance
This 35kV 8000kVA step-down transformer adopts international general size and electrical parameters, with strong compatibility with mainstream 35kV power grid systems and 10.5kV terminal power distribution equipment. It supports customized winding materials (copper/aluminum), impedance voltage, cooling methods and voltage tap settings, which can meet the personalized power supply needs of different industries, different altitudes and different grid operating environments.
5. Frequently Asked Questions (FAQ)
Q1: What is the actual effective load range of the 35kV 10.5kV 8000kVA three-phase oil immersed transformer?
A: The rated capacity of this industrial distribution transformer is 8000kVA, and the optimal long-term stable operating load range is 60% to 80% of the rated capacity, which can effectively balance operating efficiency and equipment service life. It supports 110% short-term overload operation within 2 hours to cope with instantaneous peak power consumption of industrial equipment and grid load surge. Long-term full-load or overload operation is not recommended, otherwise it will accelerate insulation aging and increase operating loss and equipment failure risk.
Q2: What kind of cooling method does this 8000kVA oil-filled transformer adopt, and is forced air cooling optional?
A: The standard configuration of this 35kV distribution transformer is ONAN oil natural air cooling, which relies on insulating oil natural circulation and radiator natural heat dissipation to complete temperature control, with low operating noise and high stability. For users with long-term high-load operation or high ambient temperature environments, we can support ONAF forced air cooling customization. After installing external cooling fans, the equipment can effectively improve heat dissipation efficiency and increase continuous load capacity, adapting to high-intensity industrial power supply scenarios.
Q3: What are the routine maintenance items and cycle for the 35kV/10.5kV oil immersed power transformer?
A: Daily maintenance is simple and efficient for this sealed oil immersed transformer. Daily inspection mainly includes checking for oil leakage, observing oil level and oil color, confirming the normal temperature and pressure state, and checking whether the wiring terminals and fastening parts are loose. It is recommended to conduct a comprehensive performance test including insulation resistance and winding resistance every six months, and perform insulating oil filtration or replacement every 3 to 5 years according to the operating environment. Regular maintenance can effectively avoid hidden faults and ensure 20+ years of stable service life of the equipment.
