400KVA Three-Phase Oil Immersed Power Substation Transformer | 35KV Input 110V/220V/380V/400V Output
1. Product Overview
The400KVA Three-Phase Oil Immersed Power Substation Transformer is a professionally manufactured medium-voltage step-down power distribution unit built for industrial substations, utility grid branches, and commercial power supply systems. Engineered with a standard 35KV high voltage input and flexible multi-range low voltage output covering 110V, 220V, 380V and 400V, this heavy-duty oil-filled transformer delivers stable three-phase power conversion for both single-phase civilian loads and three-phase industrial equipment. Adopting mature S11/S13 energy-saving design and complying with IEC 60076 and GB international power equipment standards, this industrial-grade substation transformer is one of the most cost-effective and widely used medium-capacity power transformation solutions for global 50Hz and 60Hz power grid environments.
Produced by standardized professional manufacturing processes, the whole machine adopts high-purity copper winding coils and high-grade grain-oriented silicon steel core, paired with a fully sealed oil tank and premium insulating cooling oil. With rated capacity stably maintained at 400KVA, the equipment features low magnetic leakage, low operating temperature rise and excellent insulation stability. Different from ordinary distribution transformers, this custom multi-output oil immersed transformer integrates voltage matching for global mainstream low-voltage standards, solving the voltage adaptation problem for cross-regional engineering, factory renovation and substation upgrading projects, and supporting long-term unattended continuous operation.
2. Core Product Features
2.1 Multi-Voltage Output Compatibility for Global Applications
This professionally manufactured 400KVA three-phase transformer supports four mainstream low-voltage output specifications, fully covering global power supply standards. The 110V output adapts to American and Japanese standard electrical equipment, 220V matches universal single-phase civilian and commercial power supply, 380V fits conventional domestic and Asian industrial three-phase loads, and 400V perfectly meets European and international industrial power grid requirements. The flexible multi-voltage design eliminates the need for additional voltage converters on-site, greatly improving project installation efficiency and equipment compatibility for overseas projects and multi-standard equipment matching scenarios.
2.2 Low Loss Energy-Saving Structure & High Operational Efficiency
Optimized with 45° full miter core lamination and precise winding turn ratio calibration, this 35KV oil immersed substation transformer effectively reduces no-load loss and load loss during long-term operation. The upgraded high-conductivity copper coil structure minimizes operating heat generation and magnetic flux waste, with overall power conversion efficiency reaching over 98.5%. Compared with traditional old-model transformers, it delivers more stable energy-saving performance, effectively reducing long-term power consumption and operational costs for industrial parks, municipal substations and mining power supply systems, fully meeting modern grid energy-saving and low-carbon operation requirements.
2.3 Excellent Structural Stability & Fault Resistance
Built with reinforced integral winding positioning and high-strength Class A insulating materials, the transformer has strong resistance to instantaneous short-circuit current and grid surge impact. The fully sealed welded steel oil tank structure effectively blocks external dust, moisture and corrosive gas, preventing internal insulation aging and insulating oil deterioration. With stable Dyn11 vector group design, it ensures balanced three-phase voltage and current output, suppresses grid harmonic interference and unbalanced load impact, and maintains stable operation even in complex power grid environments with frequent load fluctuations.
2.4 Reliable Oil Immersed Cooling & Wide Environmental Adaptability
Adopting standard ONAN natural oil circulation and natural air cooling mode, the equipment features stable heat dissipation, low operating noise and no fan failure risk. It can operate continuously and stably in the ambient temperature range of -40℃ to +45℃, adapting to outdoor substation open-air installation, high-temperature humid areas, dusty factory zones and other harsh working environments. The oil-immersed insulation system provides consistent temperature control and insulation protection, avoiding overheating damage during peak load operation and greatly improving overall operational reliability.
2.5 Professional Manufacturing Quality & Low Maintenance Cost
As a professionally manufactured power substation transformer, every production link follows standardized industrial processes and strict quality inspection standards, with stable product consistency and extremely low failure rate. The fully sealed maintenance-free structure avoids frequent oil replacement and internal core inspection work. Equipped with standard oil level gauges, temperature detection sensors and pressure relief valves, the equipment supports real-time operating status monitoring, realizing long-term unattended operation and greatly reducing later manual maintenance and equipment replacement costs.
3. Core Working Purposes
The core function of the 400KVA Three-Phase Oil Immersed Power Substation Transformer with 35KV input and multi-voltage output is medium-voltage step-down power conversion and safe power distribution in industrial and municipal power systems. It mainly converts 35KV medium-voltage electric energy from regional main grids into 110V, 220V, 380V and 400V low-voltage electric energy that meets the operating standards of civilian electrical appliances, industrial machinery and commercial power equipment, realizing safe voltage grade conversion and reasonable power distribution.
Beyond basic voltage transformation, this industrial substation transformer also undertakes key functions such as high-low voltage electrical isolation, grid voltage stabilization and load balancing. It can effectively isolate 35KV high-voltage grid surge and lightning impulse interference, protect downstream low-voltage equipment and operators from overvoltage risks. In industrial production and municipal power supply systems, it optimizes power transmission efficiency, reduces line loss, balances regional power load, and ensures continuous and stable power supply for various peak and steady load scenarios, serving as a core guarantee for safe and efficient operation of medium and small power distribution systems.
4. Typical Application Scenarios
4.1 Industrial Factory Substation Power Supply
This 400KVA 35KV oil immersed transformer is widely used in medium and small processing factories, machinery workshops, food processing plants and light industrial production bases. It serves as the main step-down equipment for factory self-use substations, converting 35KV medium-voltage grid power into 380V industrial three-phase power and 220V auxiliary civilian power, supporting long-term stable operation of production lines, motors, pumps and workshop auxiliary electrical equipment. The multi-voltage output design also meets the power demand of imported 110V precision equipment and 400V international standard machinery on site.
4.2 Municipal & Rural Power Grid Distribution
It is an essential core device for urban and rural power grid renovation, community terminal power distribution and street substation construction. Installed in outdoor box substations and centralized power distribution stations, the transformer converts 35KV high-voltage grid power into household 220V power and commercial 380V power, covering residential daily power consumption, community public lighting, property equipment power supply and urban public facility electricity demand, effectively improving the stability and coverage of regional power grid power supply.
4.3 Overseas Engineering & Cross-Regional Projects
Thanks to its full coverage of 110V/220V/380V/400V global mainstream voltages and 35KV medium-voltage access capability, this professionally manufactured transformer is highly suitable for overseas infrastructure construction, mining projects and international engineering contracting projects. It can perfectly match American, European, Asian and African local power grid standards and equipment voltage requirements, solving the problem of power parameter mismatch in cross-border projects and becoming a universal power transformation solution for global engineering temporary and fixed power supply.
4.4 Small and Medium-Sized New Energy Supporting Projects
The equipment is commonly used in supporting power transformation for small distributed photovoltaic power stations, rural wind power systems and micro energy storage power stations. It stabilizes fluctuating electric energy generated by new energy units, completes safe step-down conversion of 35KV grade grid-connected power, and outputs standard low-voltage power for local load use. It effectively improves the on-site consumption rate of clean energy and ensures safe and grid-compliant operation of small new energy power generation projects.
4.5 Commercial & Public Building Power Distribution
It is applicable to shopping malls, office buildings, schools, hospitals and other commercial and public building power supply systems. Installed in outdoor power distribution rooms, it provides stable multi-voltage power supply for building lighting, air conditioning, office equipment, medical devices and fire-fighting electrical systems. Its low-noise operation and high safety performance fully meet the power supply requirements of densely populated public scenarios.
5. Frequently Asked Questions (FAQ)
Q1: What are the advantages of this 400KVA 35KV oil immersed transformer compared with dry-type transformers of the same capacity?
This oil immersed power substation transformer features better heat dissipation performance, stronger overload resistance and higher cost performance than same-capacity dry-type transformers. The insulating oil circulation cooling system provides more stable temperature control during long-term full-load operation, suitable for 24/7 continuous power supply scenarios. Its fully sealed structure has excellent dust-proof, moisture-proof and anti-corrosion capabilities, adapting to outdoor open-air installation and harsh industrial environments. Meanwhile, it has lower manufacturing and maintenance costs, longer service life and stronger adaptability for 35KV medium-voltage outdoor substation projects.
Q2: How to select the correct output voltage for on-site installation and use?
Users can match the output voltage according to local grid standards and terminal equipment parameters: 110V is dedicated for American, Japanese and other North American and Japanese standard precision equipment; 220V applies to single-phase civilian lighting, household appliances and general commercial equipment; 380V is the mainstream three-phase voltage for domestic and Asian industrial production equipment; 400V is suitable for European standard power grids and international industrial mechanical equipment. We also support non-standard voltage fine-tuning and customized parameter settings for special project needs.
Q3: What daily maintenance work is required for this professionally manufactured 35KV oil immersed transformer?
This fully sealed oil immersed transformer realizes basically maintenance-free daily operation under normal working conditions. On-site staff only need to conduct regular visual inspections to check the oil level status, external sealing condition and operating temperature, and confirm no oil leakage or abnormal overheating. No frequent core lifting, oil replacement or internal cleaning is required. It only needs a comprehensive insulation performance test and oil quality analysis every 2 to 3 years, with extremely low long-term operation and maintenance costs, very suitable for unattended outdoor substations and rural power grid distribution scenarios.
