30kva 10kv 400v Oil Immersed Transformer Electrical Transformers

30kva 10kv 400v Oil Immersed Transformer Electrical Transformers

1. Product Overview

The 30kva 10kv 400v Oil Immersed Transformer Electrical Transformers are compact low-capacity three-phase distribution transformers widely adopted in global 10kV medium-voltage power grid systems. Manufactured in compliance 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 the core voltage conversion device for scattered small-load power supply scenarios. It is a highly practical industrial oil immersed electrical transformer tailored for rural power grids, small public facilities and temporary engineering power distribution projects.

Designed with a standard 10kV high-voltage input and 400V low-voltage output configuration, this low-capacity oil immersed distribution transformer efficiently converts medium-voltage overhead line power into standard three-phase four-wire 400V low-voltage electricity, fully matching civilian and small equipment power consumption standards. Adopting fully sealed oil immersion cooling technology and non-PCB environmental-friendly anti-aging mineral insulating oil, the 30kVA oil immersed power transformer features small footprint, ultra-low power loss and excellent outdoor weather resistance. Unlike bulky dry-type electrical transformers, this oil type transformer requires simple installation, supports long-term unattended outdoor operation and needs minimal routine maintenance, making it the most cost-effective power transformation solution for decentralized small-load power engineering projects.

Every finished 30kva 10kv 400v oil immersed transformer undergoes strict factory quality testing, including partial discharge detection, temperature rise verification, short-circuit impact resistance test and full-load aging inspection. With stable electromagnetic performance, balanced three-phase output and durable mechanical structure, this energy-saving oil immersed electrical transformer has become a hot-selling small-capacity transformer for urban and rural scattered power supply, small infrastructure power matching and rural power grid renovation projects worldwide.

2.Technical Parameters

3. Core Product Features

This 30kva 10kv 400v oil immersed electrical transformer adopts upgraded S13 low-loss electromagnetic design and fully sealed corrugated tank structure, optimizing the defects of high energy consumption and bulky size in traditional old-model small transformers. It delivers stable, energy-saving and low-maintenance operation for various small-load power distribution scenarios, with outstanding practicality and adaptability:

3.1 Ultra-low Energy Loss & Energy-saving Operation

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 greatly reduces standby no-load iron loss. The precisely wound compact copper coils lower internal winding resistance, minimizing copper loss during rated load operation. As an energy-saving oil immersed distribution transformer, it maintains ultra-low power consumption during long-term intermittent and continuous operation, effectively reducing long-term grid operation costs for decentralized power supply sites.

3.2 Reliable ONAN Oil Immersed Cooling & Sealed Insulation

Filled with environmental-friendly non-PCB anti-aging mineral insulating oil, the 30kVA step-down transformer adopts standard ONAN natural air circulation cooling mode. The internal insulating oil forms automatic circulating heat dissipation, ensuring uniform temperature and stable operation during 24-hour uninterrupted work. The fully sealed corrugated oil tank structure completely isolates internal insulating oil from external air, moisture and dust, preventing oil oxidation, emulsification and insulation aging. This design ensures stable dielectric performance in humid, dusty and open-air outdoor operating environments.

3.3 Precise Voltage Regulation & Strong Anti-interference Performance

Equipped with ±2×2.5% off-load tapping adjustment function, this three-phase electrical transformer accurately calibrates 10kV input voltage deviation caused by long-distance transmission and seasonal load fluctuation, ensuring stable standard 400V low-voltage output. The optional Dyn11 vector group effectively balances three-phase current and suppresses grid harmonic interference, while the Yyn0 configuration adapts to conventional balanced municipal grid scenarios. It avoids power supply jitter and small equipment damage caused by voltage surge and three-phase imbalance.

3.4 Compact Structure & Excellent Outdoor Adaptability

Featuring miniaturized integrated design and small overall footprint, this 10kV/400V oil immersed transformer saves installation space and supports pole-mounted and ground-mounted dual installation methods. The whole machine adopts thickened steel plate welding and multi-layer anti-corrosion electrostatic spray treatment, with excellent waterproof, rust-proof and dust-proof capabilities. It can operate stably in outdoor open-air environments, rural field areas and suburban scattered power distribution stations all year round, with strong environmental tolerance.

3.5 Low Maintenance & High Cost Performance

Designed with simple and robust mechanical structure, this low-capacity oil immersed power transformer has no vulnerable precision parts and requires almost no daily maintenance. The fully sealed maintenance-free design extends the replacement cycle of insulating oil, greatly reducing on-site inspection and after-sales maintenance costs. Compared with small-capacity dry-type electrical transformers, it has lower procurement cost, stronger overload resistance and wider application flexibility, which is very suitable for mass deployment of small decentralized power supply projects.

3.6 Low-noise & Safe Environmental Protection Design

Optimized core lamination and high-strength winding fixing technology effectively reduce 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 monitoring of operating status. In case of overload, overheating or internal short-circuit faults, the pressure relief device releases internal pressure timely to protect equipment, ensuring safe and stable operation of small-area power distribution networks.

4. Core Product Uses

As essential low-capacity power transformation equipment for 10kV power distribution networks, the 30kva 10kv 400v Oil Immersed Transformer Electrical Transformers undertake core functions of medium-low voltage conversion, decentralized small-area power distribution and power quality stabilization, ensuring safe and stable power supply for various small-load power consumption scenarios:

10kV to 400V Professional Step-down Voltage 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 lines and small civilian and industrial electrical equipment.

Decentralized Small-area Power Distribution: This oil immersed electrical transformer is specially used for scattered small-area power distribution in remote villages, suburban independent zones and single public facilities, reasonably distributing grid power according to low load demand and reducing line transmission loss and voltage drop.

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

Local Grid Fault Isolation & Safety Protection: It effectively isolates the upper 10kV medium-voltage main grid and local 400V low-voltage load system, preventing high-voltage fault surges from spreading to small terminal equipment and limiting the scope of grid faults in scattered power supply areas.

Long-term Stable Low-load Power Guarantee: Relying on reliable heat dissipation and stable low-load operation performance, the 30kVA oil immersed transformer supports 24-hour uninterrupted operation, meeting continuous and stable power demand for small public facilities and scattered civilian loads.

5. Wide Application Scenarios

With compact size, stable low-load performance, strong environmental adaptability and ultra-high cost performance, the 30kva 10kv 400v Oil Immersed Transformer Electrical Transformers are widely used in various small-load power supply scenarios, covering rural power upgrading, small public facilities, temporary engineering power and decentralized new energy projects:

5.1 Rural & Remote Area Power Grid Renovation

This 30kVA 10kV/400V oil immersed transformer is the preferred equipment for remote village power grid upgrading and scattered rural power supply. It solves the problem of insufficient power supply capacity and unstable voltage in remote rural areas, improving basic power supply reliability for rural residents and agricultural supporting facilities.

5.2 Small Public Facility Power Supply

Suitable for power distribution of rural street lighting systems, village water pump stations, small scenic area supporting facilities, remote monitoring stations and rural community service points. Its low-noise, energy-saving and maintenance-free operation perfectly matches the long-term unattended operation needs of small public infrastructure.

5.3 Temporary Engineering & Field Operation Power

With compact structure, convenient installation and strong outdoor weather resistance, this oil immersed electrical transformer is widely used for temporary power guarantee of small road construction, field exploration, rural infrastructure renovation and short-term outdoor engineering projects, providing stable and reliable field power support.

5.4 Small Decentralized New Energy Projects

Applicable for voltage conversion and grid connection of household small distributed photovoltaic power stations and micro wind power generation systems in rural areas. It stabilizes fluctuating new energy output, balances small-grid load and ensures safe and smooth grid connection of decentralized green power equipment.

5.5 Isolated Small-load Industrial Scenarios

Ideal for power supply of single small processing equipment, rural family workshops and isolated light-duty small mechanical equipment. Its precise voltage output and stable low-load operation can fully meet the daily power consumption needs of scattered small industrial loads.

6. Frequently Asked Questions (FAQ)

Q1: What scenarios are suitable for the 30kVA 10kV/400V oil immersed transformer?

The 30kVA ultra-low capacity is specially designed for scattered, low-power and decentralized power supply scenarios that medium and large capacity transformers cannot adapt to. It is widely used for remote rural power supply, small public facilities, temporary engineering power and household distributed new energy grid connection. As a standard 10kV grade low-loss oil immersed electrical transformer, it adopts mature ONAN oil cooling technology, with better outdoor moisture-proof and dust-proof performance than small dry-type transformers. Its miniaturized design saves installation space, and low energy loss ensures long-term economical operation, making it the most practical choice for grassroots small-load power distribution projects.

Q2: What is the difference between Dyn11 and Yyn0 connection groups for this 30kVA transformer?

The two vector groups are configured for different small-load grid operating conditions. The Dyn11 vector group has low zero-sequence impedance and excellent harmonic suppression ability, suitable for new energy grid connection and small workshop loads with slight load fluctuation and harmonic interference. The Yyn0 vector group features simple structure and ultra-stable voltage output, which is more applicable to rural residential power supply and public facility power distribution with balanced and stable load. We can flexibly configure the vector group according to customers’ on-site grid environment and actual load characteristics.

Q3: How to maintain the 30kva 10kv 400v oil immersed electrical transformer in daily use?

This fully sealed small-capacity oil immersed transformer is designed for zero-basic daily maintenance, adapting to unattended outdoor operation. On-site staff only need to conduct regular visual inspections to check oil tank sealing and avoid insulating oil leakage, and clean radiator surface dust regularly to ensure unobstructed heat dissipation. Long-term overload operation should be avoided to prevent insulation aging. Professional staff are recommended to conduct a comprehensive insulating oil quality test and internal performance inspection every 3 years. With simple standardized maintenance, the equipment can reach a 25-year stable service life and maintain long-term reliable operation.