S9 Three Phase Oil-Filled Low Voltage Transformer

Our company's S9 Three Phase Oil-Filled Low Voltage Transformer is a highly reliable power device specifically designed for low-voltage power distribution systems. Purchasing this product provides you with a high-quality transformer that combines stable performance with cost-effectiveness, widely applicable in industrial plants, commercial buildings, and residential power distribution scenarios.This product uses high-quality cold-rolled silicon steel sheets and high-purity copper windings. Its optimized core structure effectively reduces hysteresis and eddy current losses, ensuring long-term stable and reliable operation. The oil-immersed insulation cooling system provides excellent heat dissipation and overload capacity, maintaining stable output voltage even under conditions of voltage fluctuations or significant load changes. The fully sealed structure effectively isolates external moisture and impurities, extending equipment lifespan and reducing maintenance frequency.

Product Parameter (Specification)

Product Feature And Application

Product Features

Energy Efficient & Low Loss: Compared to the previous S7 series, the S9 transformer features an average reduction in no-load loss of approximately 10%, a reduction in load loss of about 22%, and an even more significant reduction in no-load current of nearly 46%. It was a nationally promoted energy-saving product at the time.

Reliable Structural Design:

Core: S9 oil-immersed transformer made from high-quality cold-rolled grain-oriented silicon steel, utilizing a fully inclined three-step lap joint core structure, effectively reducing loss and noise.

Windings: The high-voltage winding adopts a multi-layer cylindrical structure, while the low-voltage winding uses a cylindrical or improved helical structure with longitudinal oil ducts, enhancing heat dissipation and mechanical strength.

Fastening Process: All fasteners utilize self-locking anti-loosening nuts, and a core positioning structure is added to ensure stability during transportation and long-term operation, eliminating the need for core inspection and lifting maintenance.

Fully Sealed Structure (S9-M Series): S9 distribution transformer tank is designed with corrugated panels that provide a breathing function to compensate for oil volume changes, eliminating the traditional conservator. This fully sealed structure completely isolates the transformer oil from external air, effectively preventing oxygen and moisture ingress, thereby delaying the aging of the insulating oil.

Comprehensive Safety Protection: S9 Three Phase Oil-Filled Low Voltage Transformer equipped with components such as a pressure relief valve, dial thermometer, and gas relay, which promptly release pressure when internal pressure becomes too high, ensuring safe equipment operation.

Advantages of the Features

Significantly Reduced Operating Costs:The core advantage lies in energy efficiency. Compared to the S7 series, the operating costs of the S9 product are reduced by approximately 19%, resulting in substantial electricity savings over long-term operation.

High Operational Reliability:With improved coil end support, a new insulation structure, and short-circuit-resistant design, its ability to withstand sudden short circuits is significantly enhanced. It has passed sudden short-circuit tests at a nationally recognized testing center, ensuring stable operation even under adverse conditions such as grid fluctuations.

Extremely Low Maintenance Costs: The fully sealed structure eliminates the need to replace the transformer oil during its normal service life, greatly reducing maintenance workload and costs.

High Adaptability & Aesthetic Design: The corrugated tank design not only improves heat dissipation efficiency but also results in a more compact and aesthetically pleasing product, reducing the installation footprint.

Products adapt to the environment

Application Scenarios

The S9 Three Phase Oil-Filled Low Voltage Transformers are primarily used in terminal power distribution applications where 10kV or 35kV high-voltage electricity needs to be converted to 400V low-voltage electricity. Specific scenarios include:

Enclosed Type (S9-M Series): Particularly suitable for industries such as petroleum and chemical processing. These environments typically contain large amounts of oil and chemicals; the fully sealed structure effectively isolates corrosive gases, protects internal components, and ensures safe operation.

Unenclosed Type (S9 Series): Widely used in industrial and mining enterprises, construction sites, residential communities, commercial centers, airports, railway stations, and other general industrial and civil buildings as power distribution hubs.

Infrastructure and Agriculture: Commonly used in subways, drilling platforms, oil production platforms, and urban and rural agricultural power grids to provide a stable power supply for various equipment.

Production Details

The three-phase oil-filled transformer has undergone extensive optimization in product details. Through the refined design of core components such as the core, coils, oil tank, and fasteners, it achieves low loss, high reliability, and maintenance-free characteristics.

Core component structure and process

FAQ

What is an S9 three phase oil-immersed distribution transformer?

The S9 three phase oil-immersed distribution transformer is a power distribution device used to step down medium-voltage electricity, such as 6kV, 10kV, 11kV or 13.8kV, to low-voltage electricity such as 0.4kV, 0.415kV or 0.433kV. It is widely used in industrial plants, commercial buildings, residential communities, mining sites, agricultural power grids and utility distribution systems.

Can the voltage ratio of the S9 oil-immersed transformer be customized?

Yes. Lugao can customize the voltage ratio according to the local grid and project requirements. Common options include 10kV/0.4kV, 11kV/0.415kV, 13.8kV/0.4kV and other customized voltage combinations. The vector group, tapping range, frequency and accessories can also be customized.

What capacity range is available for this transformer?

The S9 oil-immersed distribution transformer can be supplied in different rated capacities according to project requirements. Common capacities include 5kVA, 10kVA, 30kVA, 50kVA, 100kVA, 250kVA, 500kVA, 1000kVA, 1600kVA, 2000kVA and 2500kVA. Please contact Lugao for a suitable model selection based on your load demand.

What is the difference between S9 and S11 oil-immersed transformers?

Compared with the S9 series, the S11 series usually has lower no-load loss and better energy-saving performance. The S9 transformer is still widely used in many distribution projects because of its stable operation, mature design and cost-effectiveness. The final selection depends on project budget, efficiency requirements, local standards and operating conditions.

Is the S9 oil-filled transformer suitable for outdoor installation?

Yes. The S9 oil-filled transformer can be designed for outdoor installation. It can be equipped with a sealed oil tank, anti-corrosion coating, pressure relief valve, thermometer, oil level indicator and other protection accessories according to project requirements. For harsh environments, please provide altitude, ambient temperature, humidity and pollution level before quotation.

What cooling method does this transformer use?

The S9 oil-immersed distribution transformer commonly uses ONAN cooling, which means Oil Natural Air Natural cooling. The transformer oil circulates naturally inside the tank to transfer heat, while the external tank surface dissipates heat through natural air cooling.

Can Lugao provide OEM or customized transformer service?

Yes. Lugao provides OEM and customized transformer services. Customization options include rated capacity, voltage ratio, frequency, vector group, tapping range, enclosure design, transformer accessories, painting color, nameplate and packaging requirements.

Product after-sales service

1. After the transformer is installed and put into operation on-site, it is guaranteed to be leak-free, and the paint is guaranteed not to peel or fade. A 5-year warranty is provided; any quality problems occurring under normal use within the warranty period will be covered by the warranty.

2. All products are covered by lifetime service, ensuring the completeness of product accessories.

3. Service life is no less than 30 years.

4. In the event of equipment failure, the supplier will respond within one hour of receiving notification from the buyer, and dispatch technical personnel to the site within 24 hours domestically.

Service Commitment

1. Our products are manufactured in strict accordance with the ISO9001-2015 quality management system requirements, ensuring 100% product quality before leaving the factory.

2. Our company provides comprehensive pre-sales, sales, and after-sales service to ensure customer satisfaction.

1. Our company offers a 60-month warranty. In the event of any quality issues, we will repair or replace the product free of charge, ensuring 100% customer satisfaction.

The design and testing of transformers shall comply with the following standards:

GB1094.1~2-1996, GB1094.3-2003, GB1094.5-2008 《Power Transformers》

GB/T6451-2015 《Specification and Technical Requirements for Oil-Immersed Power Transformers》

JB/T3837-2010 《Method of Compiling Type Designations for Transformer Products》

GB/T311.1-3.11-97 《Insulation Coordination and High Voltage Testing Techniques for High Voltage Transmission and Transformation Equipment》

GB10237-88 《Insulation Levels and Dielectric Tests for Power Transformers—External Insulation Air Clearances》

GB7595-87 《Quality Standard for Transformer Oil in Service》

GB7328-87 《Measurement of Sound Level for Transformers》

GB7534-87 《Measurement of Partial Discharge》

GB/T15164-94 《Loading Guide for Oil-Immersed Power Transformers》

DL/T586-95 《Technical Guide for Manufacturing Supervision of Power Equipment Users》

GB/T311.1-3.11-97 《Insulation Coordination and High Voltage Testing Techniques for High Voltage Transmission and Transformation Equipment》

GB2536-1990 《Transformer Oil》

JB/T56011-92 《Product Quality Classification for Oil-Immersed Power Transformers》

ZBK41005-89 《Sound Level of 6-220KV Transformers》