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10KV 315KVA Three Phase Low Loss Distribution Transformer

10KV 315KVA Three Phase Low Loss Distribution Transformer

The 10kV 315kVA Three-Phase Low Loss Distribution Transformer is engineered for maximum energy efficiency and long-term reliability. Utilizing advanced oil-immersed technology, it significantly reduces no-load and load losses while ensuring superior thermal performance and insulation. Its high-quality cold-rolled silicon steel core minimizes electromagnetic losses, while the fully sealed structure prevents oil oxidation, extending service life with minimal maintenance. Designed for stable voltage regulation under varying load conditions, this transformer is an ideal solution for urban substations, commercial complexes, and industrial applications requiring dependable, low-loss power distribution.

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Product Accessories

Core (Magnetic Circuit System)
Materials: Constructed using high-permeability cold-rolled silicon steel sheets with a full-oblique seam lamination process and a stepped cross-sectional design, significantly reducing no-load losses by 30%-40% compared to the S11 series.
Features: Exhibits low hysteresis losses and operates with minimal noise; the core surface is coated with an anti-rust resin to extend its service life.

Winding System (Electrical Circuit System)
High-voltage Winding: The 10kV side utilizes a multi-layer cylindrical winding structure, with either copper or aluminum conductors. Each turn is wrapped with DMD insulation paper to boost mechanical strength and improve short-circuit resistance.
Low-voltage Winding: The 0.4kV side is wound using copper foil, which reduces eddy current losses and enhances heat dissipation efficiency.
Insulation Process: Employs Vacuum Pressure Impregnation (VPI) with Class H insulation materials (rated up to 180°C) and incorporates a vacuum oil injection process to eliminate internal air bubbles for optimal performance.

Oil Tank and Cooling System
Oil Tank Structure: Features a fully sealed corrugated steel plate oil tank that eliminates the need for an external conservator. The inherent elasticity of the corrugated fins compensates for oil volume changes, effectively isolating the oil from oxygen and moisture to ensure maintenance-free operation.
Cooling Method: Utilizes natural oil cooling (ONAN) where the corrugated radiator fins facilitate efficient heat dissipation without the need for supplementary fans.

Protective Devices
Pressure Relief Valve: Automatically releases pressure when the internal pressure exceeds 35 kPa, thereby preventing potential oil tank rupture.
Gas Relay (Buchholz Relay): Monitors for gas accumulation from internal faults, triggering alarms or circuit breaker trips, and is standard for units rated at 315kVA and above.
Temperature Controller: Equipped with PT100 sensors for remote oil temperature monitoring; signal thermometers are standard on models of 800kVA and above.

Tap Changer
No-Load Tap Changer (NLTC): Provides voltage regulation on the high-voltage side with an adjustment range of ±5% or ±2×2.5%. Operation requires de-energization, ensuring the transformer adapts effectively to grid voltage fluctuations.

Bushings and Terminal Connectors
High-voltage Bushings: Constructed from porcelain or composite silicone rubber, these bushings maintain a creepage distance of ≥25mm/kV and incorporate an anti-pollution flashover design for enhanced safety.
Low-voltage Terminals: Utilize tinned copper busbars with anti-oxidation treatment to support high-current connections reliably.

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Product Specifications

Voltage Rating

Primary Side: 10 kV

Secondary Side: 0.4 kV

Power Capacity

315KVA

Phase Configuration

3-phase

Operating Frequency

50/60Hz

No-load Loss

≤336–480 W (typical)

On-load Loss

≤2738–3650 W (at 75°C)

Short-circuit Impedance

4%–4.5% (standard)

Vector Group

Dyn11 or Yyn0

Sound Level

≤52 dB (A-weighted, measured at 1 meter)

Standards Compliance

Meets IEC 60076 ANSI and IEEE requirements

Product Applications

Economy is more affordable

Optimized for dense city grids, this transformer provides stable power delivery for residential and commercial areas with minimal energy loss.

Urban Substation Networks
Designed for high-demand industrial environments, it ensures continuous, reliable power to support production lines and heavy machinery.

Industrial Manufacturing Facilities
Ideal for integrating renewable sources such as wind and solar, it enhances grid stability while efficiently converting and distributing energy.

Renewable Energy Plants
Suitable for powering critical public facilities like hospitals and transportation hubs, it maintains robust performance under varying load conditions.

Public Infrastructure & Utilities

Product Advantages

Outstanding Energy Efficiency

The advanced core design reduces no-load losses by 25%-30% over previous models, lowering operational energy costs significantly.

Efficient Thermal Management

A fully sealed, corrugated oil tank combined with ONAN cooling ensures excellent heat dissipation, extending service life and reducing maintenance.

Reliable and Flexible Performance

High-grade materials and customizable voltage options guarantee stable operation in diverse environments and under fluctuating loads.

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.