1600kVA High Standard 35kV to 0.4kV 3 Phase Oil Step Down Transformer

1. Product Description

This high standard 1600kVA 3 phase oil step down transformer is a professional medium-to-large capacity oil immersed distribution transformer designed for industrial power grid voltage reduction and low-voltage power distribution. Adopting mature oil-immersed cooling and insulating technology, the equipment supports 35kV high voltage input and stable 0.4kV (400V) low voltage output, perfectly matching the voltage conversion demand from urban and industrial 35kV medium-high voltage power grids to conventional civil and industrial 400V power consumption terminals. Manufactured in strict accordance with IEC 60076 international power standards and national power industry specifications, this 35kV to 0.4kV oil step down transformer features standardized production process and rigorous quality testing, ensuring stable performance, low operating loss and strong environmental adaptability in long-term grid operation.

The whole machine adopts a high-quality grain-oriented silicon steel core and pure copper winding structure, with optimized internal magnetic circuit design to effectively suppress magnetic leakage and reduce no-load and load loss during full-load operation. Equipped with a fully sealed oil tank structure and vacuum oil injection technology, the 1600kVA oil immersed step down transformer isolates internal insulating components from external moisture, dust and corrosive air, avoiding insulating oil aging and damp failure. With a standard 50Hz industrial power frequency design and optional ±5% or ±2×2.5% high-voltage tap adjustment, it can adapt to subtle voltage fluctuations of 35kV power grids, realizing accurate and stable 400V output voltage, which is widely recognized as a reliable core device for medium-voltage grid step-down power distribution.

2. Core Product Uses

The primary core use of this high standard 3 phase 35kV to 400V step down transformer is to complete safe, efficient and continuous voltage reduction and power distribution conversion in medium and high voltage power supply systems. It solves the core industry problem that 35kV high-voltage grid electricity cannot be directly used by conventional 400V low-voltage electrical equipment, realizing the safe transition from medium-high voltage power transmission to low-voltage power consumption.

In regional power supply systems, the 1600kVA oil step down transformer undertakes key tasks of grid voltage conversion, power load distribution and power supply stabilization. It can stably convert 35kV high-voltage grid power into standard 0.4kV industrial and civil power supply, provide matched voltage power for low-voltage distribution cabinets, mechanical equipment, lighting systems and complete electrical appliances. At the same time, the low-loss design effectively reduces electric energy loss during voltage conversion and power transmission, improves the overall power utilization rate of the power system, and stabilizes terminal voltage to avoid equipment damage caused by overvoltage or undervoltage. It also supports peak load regulation and balanced power distribution for regional power grids, ensuring the continuity and stability of on-site power consumption.

3. Main Application Scenarios

3.1 Industrial Enterprise Power Distribution

This 1600kVA 35kV to 0.4kV oil immersed transformer is the preferred power transformation equipment for medium and large manufacturing factories, chemical plants, metallurgy workshops and processing enterprises. Most industrial parks access 35kV medium-high voltage municipal power grids, while production equipment, workshop lighting and auxiliary facilities all rely on 400V low-voltage power supply. This high standard step down transformer can stably reduce grid voltage to standard industrial low voltage, meet the long-term high-load power demand of industrial production lines, and adapt to continuous uninterrupted operation of industrial scenarios.

3.2 Urban and Rural Power Grid Renovation & Distribution Station

It is widely applied in urban old power grid renovation, rural power grid upgrading and outdoor box-type substation construction projects. As a key terminal step-down device of 35kV power distribution network, the 3 phase 400V output oil step down transformer converts high-voltage grid power into civil low-voltage electricity, covering residential communities, commercial plazas, schools and hospitals. Its fully sealed outdoor design adapts to outdoor open-air installation, effectively improving the coverage and reliability of urban and rural low-voltage power supply.

3.3 Mining & Infrastructure Engineering

Mining areas, highway engineering bases, railway construction sites and remote infrastructure projects usually adopt 35kV high-voltage power supply for long-distance power transmission. The 1600kVA high standard step down transformer can realize on-site voltage reduction, provide stable 400V power for construction machinery, temporary power consumption equipment and on-site living facilities. Its strong overload resistance and harsh environment adaptability can cope with complex outdoor working conditions such as dust, humidity and temperature difference in engineering construction sites.

3.4 New Energy Supporting Power Distribution

It serves as supporting power distribution equipment for centralized photovoltaic power stations, wind power projects and energy storage power stations. In new energy power supply systems, it assists in converting 35kV grid-connected power into low-voltage power for station self-consumption, meeting the power demand of new energy station monitoring equipment, cooling systems and daily operation facilities, realizing reasonable distribution and efficient utilization of new energy power resources.

4. Product Core Features

4.1 High Standard Manufacturing & Stable Voltage Output

This 1600kVA oil step down transformer is manufactured with high standard industrial production standards, with strict precision control on core winding, iron core lamination and assembly process. The optimized Dyn11 connection group effectively balances three-phase current, suppresses harmonic interference, and keeps the 0.4kV output voltage fluctuation within ±1% under rated load, ensuring ultra-stable low-voltage power supply. The adjustable high-voltage tap design can flexibly adapt to 35kV grid voltage deviation in different regions, avoiding terminal voltage instability caused by grid fluctuation.

4.2 Ultra-Low Energy Loss & High Power Efficiency

Adopting high-grade cold-rolled grain-oriented silicon steel sheets and full diagonal seam stacking technology, the equipment greatly reduces magnetic flux leakage and no-load loss. The high-purity copper winding with low resistance structure minimizes heat generation and load loss during high-load operation. Compared with traditional ordinary distribution transformers, this 35kV to 400V step down transformer has lower comprehensive power loss, higher power conversion efficiency, effectively reducing long-term operating power consumption and helping users save grid operation and power consumption costs.

4.3 Fully Sealed Structure & Strong Environmental Adaptability

The whole machine adopts fully sealed corrugated oil tank structure and vacuum pressure oil injection process, without oil conservator design, which effectively prevents insulating oil oxidation deterioration and moisture infiltration. The external shell is treated with anti-rust and anti-corrosion coating, adapting to outdoor open-air installation, rain erosion, dust accumulation and high and low temperature alternating working environment. It can operate stably in the ambient temperature range of -25℃ to 45℃ and high humidity environment, with strong climate adaptability and wide installation scope.

4.4 Complete Safety Protection & High Operation Reliability

Equipped with standard pressure relief valve, Buchholz relay, oil level gauge and temperature real-time monitoring device, the 3 phase oil immersed step down transformer has multiple protection functions including overvoltage protection, overcurrent protection, short-circuit protection and overload protection. It can automatically alarm and cut off the circuit in case of grid short circuit, overload and abnormal temperature rise, effectively protecting equipment safety and avoiding power grid failure. The product has strong mechanical strength and short-circuit impact resistance, with a design service life of more than 30 years, realizing long-term trouble-free operation.

4.5 Low Maintenance & High Cost Performance

Thanks to the fully sealed maintenance-free design, the equipment does not need frequent oil replacement and internal cleaning, greatly reducing daily operation and maintenance workload and later maintenance costs. The ONAN natural oil cooling mode runs quietly and stably without additional cooling equipment, with low operating noise and low energy consumption. The 1600kVA rated capacity is perfectly matched with most medium-scale industrial and municipal power distribution projects, balancing load capacity, equipment investment and operating cost, with extremely high comprehensive cost performance.

5. FAQ (Frequently Asked Questions)

Q1: What load scenarios is the 1600kVA 35kV to 0.4kV step down transformer suitable for, and what is its maximum safe load?

This high standard 1600kVA 3 phase oil step down transformer is mainly suitable for medium-load industrial parks, single medium-sized factories, rural and urban community centralized power distribution, and engineering temporary power supply projects. Its rated safe operating load is 1600kVA, and it can withstand 1.1 times short-term overload operation for a short time to cope with peak power consumption. In actual project deployment, it is recommended to control the daily operating load within 80%-90% of the rated capacity to avoid long-term full-load or overload operation, which can effectively extend the service life of the transformer and ensure stable power supply.

Q2: Is this oil immersed 35kV/400V transformer suitable for outdoor installation and rainy weather operation?

Yes, this 1600kVA oil immersed distribution transformer is specially optimized for outdoor working conditions. The fully sealed integral structure completely isolates internal insulating oil and electrical components from external rainwater and humid air, with excellent waterproof, dustproof and moisture-proof performance. The anti-corrosion shell and sealed wiring terminals can resist rain erosion, ultraviolet aging and atmospheric corrosion. It can operate stably in continuous rainy days, high humidity and outdoor open environment, and is the mainstream outdoor step-down power transformation equipment for 35kV power grids. No additional rainproof shelter is required for conventional outdoor installation.

Q3: What are the routine maintenance items for long-term operation of the 35kV to 0.4kV oil step down transformer?

This sealed oil immersed transformer has low maintenance difficulty, and daily routine maintenance is concentrated in regular inspection and state monitoring. First, regularly observe the oil level and oil temperature through the external oil level gauge and temperature indicator to ensure the heat dissipation system works normally. Second, regularly check the tightness of high and low voltage wiring terminals to avoid poor contact and heat generation. Third, test the sensitivity of safety protection devices such as pressure relief valve and gas relay quarterly to ensure timely response to abnormal conditions. Fourth, clean the dust and sundries on the surface of the radiator regularly to maintain efficient heat dissipation. Comprehensive performance inspection and insulating oil quality detection once a year can ensure long-term stable and safe operation of the equipment.