400kva 10kv 400v Oil Immersed Transformer Electrical Transformers

400kva 10kv 400v Oil Immersed Transformer Electrical Transformers

1. Product Overview

The 400kva 10kv 400v Oil Immersed Transformer Electrical Transformers are high-efficiency medium-small capacity three-phase distribution transformers widely deployed in global 10kV medium-voltage power grid systems. Manufactured in strict accordance with IEC 60076 international standards and GB/T 6451 industry specifications, this 10kV to 400V step down oil immersed transformer belongs to the mainstream S11 and S13 low-loss transformer series, serving as core power conversion equipment for urban and rural grid renovation, light industrial power distribution and municipal public power supply projects.

Designed with a standard 10kV high-voltage input and 400V low-voltage output configuration, this industrial oil immersed electrical transformer efficiently converts medium-voltage overhead line power into usable three-phase four-wire low-voltage electricity that matches global civil and industrial power standards. Adopting fully sealed oil immersion cooling technology and high-purity anti-aging mineral insulating oil, the 400kVA oil immersed distribution transformer features stable heat dissipation, ultra-low operational loss and excellent outdoor environmental adaptability. Compared with conventional dry-type electrical transformers, this oil type power transformer requires lower upfront investment, supports long-term full-load outdoor operation and needs minimal routine maintenance, making it one of the most cost-effective power transformation solutions for grassroots power engineering projects.

Every finished 400kva 10kv 400v oil immersed transformer undergoes comprehensive factory testing including partial discharge detection, temperature rise testing, short-circuit impact resistance verification and full-load aging inspection. With optimized electromagnetic structure, balanced three-phase output and reliable mechanical stability, this energy-saving oil immersed power transformer has become a hot-selling electrical device for residential community power supply, small and medium factory power matching and rural power grid upgrading projects worldwide.

2. Technical Parameters

3. Core Product Features

This 400kva 10kv 400v oil immersed electrical transformer adopts upgraded S13 low-loss electromagnetic design and fully sealed corrugated tank structure, solving the problems of high energy consumption, poor stability and weak weather resistance of traditional old-generation distribution transformers. It delivers reliable and efficient performance for long-term continuous operation in medium-small load power distribution systems:

3.1 Ultra-low Energy Loss & High Energy-saving Efficiency

The transformer core adopts high-permeability grain-oriented cold-rolled silicon steel sheets with full oblique lap joint technology, which effectively suppresses magnetic flux leakage and minimizes standby no-load iron loss. The precisely wound compact pure copper coils feature low internal resistivity, greatly reducing copper loss under rated full-load operation. As an energy-saving oil immersed distribution transformer, it significantly cuts down daily power consumption and grid line loss, bringing stable long-term energy-saving benefits for power grid stations, industrial users and residential power supply systems.

3.2 Reliable ONAN Oil Immersed Cooling & Sealed Insulation

Filled with environmental-friendly non-PCB anti-aging mineral insulating oil compliant with international safety standards, the 400kVA step-down transformer adopts standard ONAN natural circulation cooling mode. The autonomous oil circulation system continuously absorbs and dissipates heat generated by power conversion, ensuring uniform internal temperature and stable operation during 24-hour uninterrupted full-load work. The fully sealed corrugated oil tank structure isolates internal insulating oil from external air, moisture and dust, preventing oil emulsification, oxidation and insulation aging, and maintaining excellent dielectric performance in humid, dusty and open-air outdoor environments.

3.3 Stable Voltage Regulation & Strong Anti-interference Performance

Equipped with high-precision off-load voltage tapping adjustment function within ±5% range, this three-phase electrical transformer accurately calibrates 10kV input voltage deviation caused by long-distance transmission loss and seasonal load fluctuation, ensuring constant standard 400V low-voltage output. The optional Dyn11 vector group effectively balances three-phase current, suppresses grid harmonic interference and unbalanced load impact, while the Yyn0 configuration adapts to conventional balanced municipal grid scenarios. It effectively avoids power supply instability and terminal equipment damage caused by voltage surge and three-phase imbalance.

3.4 Excellent Outdoor Adaptability & Structural Durability

The whole machine adopts thickened steel plate welding and multi-layer anti-corrosion electrostatic spray treatment, with outstanding waterproof, dustproof, rust-proof and anti-aging capabilities. This 10kV/400V oil immersed transformer can operate stably in outdoor pole-mounted installation, suburban distribution stations, rural open-air environments and light industrial zones all year round. The reinforced internal core and winding structure enhances vibration resistance and short-circuit impact resistance, effectively reducing daily equipment failure rate and improving overall operational safety and stability.

3.5 Low Maintenance & High Comprehensive Cost Performance

Designed with a robust and simple mechanical structure, this medium-small capacity oil immersed power transformer has no easily damaged components and requires minimal routine maintenance. The fully sealed maintenance-free design extends the replacement cycle of insulating oil, greatly reducing daily on-site inspection workload and later operational and maintenance costs. Compared with equivalent dry-type electrical transformers, it features lower procurement cost, stronger overload tolerance and wider application flexibility, achieving ultra-high comprehensive cost performance for mass grassroots power distribution projects.

3.6 Low-noise & Environmentally Friendly Safe Operation

Optimized core lamination and high-strength winding fixing technology effectively weaken operating vibration and running noise, fully meeting urban and rural environmental protection noise standards. Equipped with standard oil level gauge, real-time temperature detector and automatic pressure relief valve, the transformer supports real-time operational status monitoring. In case of overload, overheating or internal short-circuit faults, the pressure relief device releases internal pressure timely to avoid equipment damage, ensuring safe and stable operation of the entire power distribution network.

4. Core Product Uses

As essential medium-small capacity power transformation equipment for 10kV power grid systems, the 400kva 10kv 400v Oil Immersed Transformer Electrical Transformers undertake core functions of voltage step-down conversion, decentralized regional power distribution and power quality optimization, ensuring safe, efficient and stable operation of medium-small load power consumption systems:

10kV to 400V Medium-Low Voltage Step-down Conversion: The core function is to convert 10kV medium-voltage grid transmission power into standard 400V three-phase low-voltage power, realizing safe and precise voltage matching between high-voltage overhead transmission lines and terminal civilian, commercial and light industrial electrical equipment.

Decentralized Regional Power Distribution: This oil immersed electrical transformer undertakes decentralized power distribution tasks for township areas, suburban residential clusters and concentrated light industrial zones, reasonably distributing grid power according to actual peak and valley load demand, balancing three-phase load current and reducing power transmission line voltage drop and power loss.

Power Supply Quality Stabilization & Optimization: By adjusting off-load tap positions, the equipment calibrates system voltage deviation caused by long-distance transmission loss and seasonal load changes, stabilizes terminal 400V voltage within standard range, suppresses grid harmonics and three-phase unbalance, and comprehensively improves regional power supply quality and operational stability.

Power Grid Fault Isolation & System Safety Protection: It effectively isolates the upper 10kV medium-voltage main grid and lower 400V low-voltage load system, preventing high-voltage fault surges from spreading to user terminals, limiting grid fault scope and reducing terminal electrical equipment batch damage risks.

Long-term Continuous Power Supply Guarantee: Relying on excellent heat dissipation performance and short-term overload resistance, the 400kVA oil immersed transformer supports 24-hour uninterrupted operation, meeting stable power demand for residential daily consumption, public facilities and light industrial continuous production.

5. Wide Application Scenarios

With stable performance, moderate load capacity, strong environmental adaptability and high cost performance, the 400kva 10kv 400v Oil Immersed Transformer Electrical Transformers cover most mainstream medium-small load power supply scenarios, widely applied in municipal grid construction, rural power renovation, light industrial power supply and new energy supporting projects worldwide:

5.1 Urban & Rural Power Grid Renovation

This 400kVA 10kV/400V oil immersed transformer is the mainstream core equipment for urban suburban grid upgrading, township centralized power supply and old community power grid reconstruction. It effectively solves the problems of insufficient power supply capacity and unstable voltage of aging power grids, improving regional power grid carrying capacity and power supply reliability.

5.2 Medium & Light Industrial Park Power Supply

Widely used in small and medium-sized manufacturing parks, food processing factories, textile workshops, woodworking processing bases and light industrial production clusters. The 400kVA load capacity fully meets the long-term stable power demand of medium-small scale production lines and mechanical auxiliary equipment, ensuring uninterrupted industrial production power supply.

5.3 Municipal & Public Infrastructure Facilities

Suitable for power distribution of urban residential communities, township hospitals, primary and secondary schools, rural water pump stations, street lighting systems and scenic area supporting facilities. Its low-noise, energy-saving and stable operation will not affect daily living and public service environments, fully meeting municipal and rural public infrastructure power supply standards.

5.4 Distributed New Energy Grid Connection Projects

Applicable for supporting power transformation and grid connection of small and medium-sized distributed photovoltaic power stations, rural wind power generation systems and decentralized new energy power supply projects. The stable voltage conversion performance effectively balances new energy power fluctuation and ensures smooth grid connection and safe power transmission.

5.5 Medium-term Fixed & Temporary Engineering Power

With compact structure, convenient installation and excellent outdoor weather resistance, this oil immersed electrical transformer is commonly used for fixed power guarantee of municipal construction bases, road renovation projects and rural infrastructure construction, providing reliable stable power support for long-term field operation.

6. Frequently Asked Questions (FAQ)

Q1: Why is the 400kVA 10kV/400V oil immersed transformer widely used for medium-small load power distribution?

The 400kVA capacity is the most practical and balanced medium-small capacity for most grassroots power distribution scenarios, avoiding capacity waste of large transformers and insufficient load capacity of small models. As a standard 10kV grade S13 low-loss oil immersed electrical transformer, it adopts mature ONAN oil circulation cooling technology, with better outdoor adaptability and heavy-load heat dissipation performance than dry-type transformers. It can maintain stable operation under long-term full-load and intermittent overload conditions, with low failure rate and simple daily maintenance. The standard 10kV to 400V voltage ratio adapts to most global civil and industrial grid standards, making it the preferred cost-effective choice for urban and rural grid upgrading and light industrial power supply projects.

Q2: What is the difference between Dyn11 and Yyn0 vector groups for this 400kVA transformer?

Dyn11 and Yyn0 are two mainstream connection groups for three-phase distribution transformers, tailored for different load characteristics. The Dyn11 vector group has low zero-sequence impedance and strong suppression ability for three-phase unbalanced load and harmonic current, making it more suitable for light industrial workshops and new energy grid connection scenarios with complex and fluctuating loads. The Yyn0 vector group features simple structure and ultra-stable voltage output, which is more applicable to conventional residential communities and municipal public facilities with relatively balanced load. We can freely configure the vector group according to customers’ on-site grid conditions and actual load types.

Q3: What routine maintenance does the 400kva 10kv 400v oil immersed electrical transformer require?

This fully sealed oil immersed transformer is designed for low daily maintenance, suitable for unattended outdoor substation operation. On-site staff only need to conduct regular visual inspections, check oil tank sealing status to prevent insulating oil leakage, and clean radiator surface dust to ensure unobstructed heat dissipation. It is necessary to avoid long-term overloaded operation to prevent accelerated insulation aging. Professional teams are recommended to conduct a comprehensive insulating oil quality test and internal performance calibration every 2 to 3 years. With standardized simple maintenance, the equipment can achieve a 25-year design service life and maintain stable long-term operational performance.