Distribution Transformer

10kV Three Phase Oil Immersed Distribution Transformer S13-M Series

As 10kV high-voltage electricity passes through this transformer's core, the unit achieves more than just a step-down conversion from kilovolts to hundreds of volts; it ensures meticulous preservation of power quality. Low-loss silicon steel sheets maximize the conversion of electricity into useful power rather than heat, translating directly into savings on electricity bills. Meanwhile, the fully sealed corrugated structure grants it robust outdoor durability—enabling stable operation without extra protection, whether facing the biting -25°C cold of the north or the humid, rainy "plum rain" season of the south. Crucially, it is a versatile solution: the off-circuit tap-changing version offers multiple manual adjustment settings to handle grid voltage fluctuations, while the smart version comes with pre-installed data interfaces, ready for seamless integration into your distribution automation system. This is a step-down unit designed for both the present and the future.

Scope of Application

Urban & Rural Power Grid

With outdoor weather resistance and flexible voltage regulation, it safeguards the "last mile" of residential power supply.

Industrial Park & Factory

Robust overload capability and low-loss design support the continuous operation of production equipment and cost control.

Commercial & Residential Complex

Low noise and fully sealed safety ensure "invisible power supply," allowing commercial and living spaces to coexist without mutual interference.

Product Description

1 - The transformer core is constructed from high-quality imported cold-rolled silicon steel sheets; this design significantly reduces no-load losses and no-load current. The core is securely bound to ensure tightness and minimize noise.
2 - Oxygen-free copper is used for the high- and low-voltage windings. Low-voltage windings utilize a double-layer cylindrical structure for ratings of 500 kVA and below, and a double-helical or quadruple-helical structure for ratings above 630 kVA; high-voltage windings employ a multi-layer cylindrical structure.
3 - The transformer utilizes a Dyn11 connection group to mitigate the impact of harmonics on the power grid and improve power supply quality.

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Product Features

Ultra-low-loss energy-saving core

Does the transformer consume power even when idle? Optimized magnetic circuit design minimizes standby losses, resulting in clearly visible electricity cost savings.

Reinforced all-copper windings

Worried about short-circuit surges ruining the coils? Tightly secured all-copper windings withstand sudden impacts, ensuring safe, reliable operation.

Fully sealed corrugated oil tank

Worried about oil leaks or moisture-induced failure? The corrugated tank features a self-breathing design, eliminating the need for oil top-ups or desiccant replacement throughout its service life.

Wide environmental adaptability

Coastal salt spray, industrial dust, or humid southern weather? No need for a protective enclosure; it is rugged enough for outdoor installation.

Low-noise optimized structure

Worried about complaints regarding low-frequency humming? Vibration-dampening and gap-sealing designs ensure operation quieter than an air conditioner's outdoor unit, preventing nighttime disturbances.

Main parameters

Rated Voltage & Capacity: 10kV/0.4kV; capacity 30kVA–3150kVA, non-standard customization supported

Tap Regulation Range: Standard ±2×2.5% NLTC; OLTC on-load tap changer optional for special projects

Cooling Mode: Standard ONAN natural oil cooling; ONAF forced air cooling for heavy peak loads

Connection Group: Standard Dyn11 three-phase balanced wiring; Yyn0 alternative on request

Execution standards

IEC 60076

International general standard for oil immersed power transformers

GB/T 6451

National technical specification for three-phase oil immersed distribution transformers

GB 20052

China mandatory energy efficiency limit standard for power transformers

ISO 9001

Global quality management system certification standard for manufacturing

Technical advantages

Our 10kV oil-immersed distribution transformers utilize S13-type energy-efficient cores to minimize no-load losses to the lowest levels permitted by national standards, thereby continuously reducing electricity costs throughout the product's lifecycle. Featuring all-copper windings and a reinforced clamping process, the transformers effectively withstand the instantaneous impact forces caused by sudden short circuits, significantly lowering the risk of equipment damage. The fully sealed corrugated oil tank automatically accommodates oil volume fluctuations caused by temperature changes, ensuring leak-free outdoor operation and low maintenance requirements—eliminating the need for frequent oil replenishment or additional moisture-proofing measures. Customers can choose between off-circuit tap-changing and smart remote monitoring versions, with capacities customizable to specific needs; these transformers are widely applicable to urban and rural power grids, industrial parks, residential complexes, and distributed photovoltaic systems. Backed by a comprehensive production and testing system, every unit undergoes rigorous, full-scope inspection before leaving the factory; the company has successfully served key projects such as the Qinghai-Tibet Railway power supply system, Shaanxi Coal Group, and national rural grid upgrades. With a robust sales and service network covering Africa and Central Asia, we ensure reliable supply and after-sales support; our products are not only popular domestically but are also exported to markets such as Kenya and Tajikistan. Please feel free to contact us at any time!