10kv Transformer

I. Product Introduction

The 10kV S9 Series Oil-immersed Transformers are widely used economical and energy-saving transformers in 10kV distribution networks, representing traditional high-quality domestic models. Based on mature manufacturing techniques, they are positioned with core advantages of high reliability, low operating costs, and easy installation & adaptation. They enable efficient voltage reduction and power distribution, suitable for various 10kV power distribution scenarios including urban and rural power grids, industrial and mining enterprises, commercial complexes, and civil buildings. As standardized power distribution equipment, they achieve an ideal balance between cost performance and practical value.

II. Technical Parameters（Customizable）

Core Rated Parameters

• Rated Voltage: High-voltage side 10kV (±5% tap adjustment), Low-voltage side 0.4kV (three-phase four-wire system)

• Rated Capacity: 30kVA～2500kVA (common specifications: 30, 50, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500kVA)

• Rated Frequency: 50Hz

• Connection Group: Standard Dyn11 (adaptable to most distribution requirements and capable of supplying single-phase loads)

Loss Parameters (Typical 10kV Capacities)

Other Key Parameters

• Cooling Mode: ONAN (Oil-Immersed Natural Cooling)

• Impedance Voltage: 4% (standard configuration for common capacities, meeting grid interconnection requirements)

• Noise Level: 55～70dB (slightly increases with capacity, lower than traditional S7 series)

• Operating Temperature: Top oil temperature rise ≤55K, maximum top oil temperature ≤95℃

• Insulation Class: Class A (supports long-term stable operation with long insulation life)

III. Main Features

1. Energy-Saving & Low Operating Costs

Adopting high-permeability cold-rolled silicon steel sheets with a 45° full-step-lap structure, it greatly reduces hysteresis and eddy current losses. Compared with traditional S7 transformers, no-load loss is reduced by approximately 10%, load loss by about 24%, and no-load current by around 46%. Long-term operation significantly cuts electricity expenses with a short return-on-investment period, ideal for energy-saving grid renovation.

2. Fully Sealed & Maintenance-Free, High Reliability

Equipped with a fully sealed corrugated oil tank, eliminating the traditional oil conservator, so that the insulating oil is completely isolated from air to prevent oxidation, moisture absorption and leakage. The core assembly is cured with epoxy resin; the winding adopts a spiral structure with vertical oil ducts. Core lifting and oil replacement are not required, with minimal routine maintenance, high operational stability and long mean time between failures.

3. Excellent Short-Circuit Withstanding Capacity for Complex Conditions

The iron core uses multi-stage lamination technology with uniform magnetic circuit distribution. Optimized winding design delivers outstanding resistance to sudden short circuits, adapting to voltage fluctuations and sudden load changes. It prevents equipment damage and is suitable for urban, rural and industrial/mining areas with large load fluctuations.

4. Compact Structure & Easy Installation

Replacing conventional structures with a corrugated oil tank reduces overall height and footprint, making it suitable for space-limited environments such as residential districts, street-side distribution rooms and factory corners. Fully assembled before delivery, the transformer only requires cable connection, oil conservator (not included in some models) and commissioning on site, shortening installation time and reducing construction costs.

5. Low Noise & Environmentally Friendly

High-quality silicon steel sheets and optimized magnetic circuit design reduce operating noise by 10–15dB compared with traditional transformers, complying with environmental standards for quiet areas such as residential zones, schools and hospitals. The oil tank features anti-corrosion coating with strong weather resistance, suitable for outdoor humid and dusty environments.

IV. Application Scenarios

1. Urban & Rural Distribution Networks

As core 10kV distribution equipment, it is applied in urban residential quarters, renovation of old communities, rural power grid upgrading and township distribution networks, providing stable power supply for residential use and small commercial facilities while ensuring grid reliability and energy efficiency.

2. Industrial & Mining Enterprises

Suitable for factories, mines, building materials plants, chemical plants and other industrial sites, supplying stable power for production equipment, lighting and office areas. It withstands large load fluctuations and long continuous operation, reducing electricity and maintenance costs.

3. Commercial & Public Buildings

Applied in shopping malls, supermarkets, office buildings, hotels, hospitals, schools and other public facilities, meeting power demands for commercial operation, medical treatment, teaching and office work, with low noise, energy saving and high reliability.

4. Infrastructure & Temporary Power Supply

Used for road lighting, transportation hubs (railway stations, high-speed rail stations), water pump stations and other infrastructure. It also serves as temporary power for construction sites, featuring flexible installation and convenient relocation.

5. Special Power Distribution Applications

Suitable for oil fields, photovoltaic power stations, wind power supporting systems and other dedicated fields, providing step-down distribution for small distributed energy projects and industrial special loads, meeting industry standardization and reliability requirements.