10kV 315kVA Three-Phase Low Loss Distribution Transformer
The 10kV 315kVA Three-Phase Low Loss Distribution Transformer is designed for superior energy efficiency, long-term reliability, and stable performance in modern power distribution networks. Featuring advanced oil-immersed technology, it effectively minimizes no-load and load losses while enhancing thermal and insulation performance. Its high-quality cold-rolled silicon steel core reduces electromagnetic losses, and the fully sealed oil tank prevents oxidation, ensuring an extended service life with minimal maintenance. This transformer is widely used in urban substations, commercial buildings, industrial facilities, and other applications requiring dependable low-loss power distribution.
Core (Magnetic Circuit System)
The magnetic core is manufactured from high-permeability cold-rolled silicon steel sheets using a full-oblique seam lamination structure. The stepped cross-sectional design significantly reduces no-load losses by 30%–40% compared to traditional S11 series transformers. With low hysteresis losses and quiet operation, the core is coated with durable anti-rust resin for additional protection and extended service life.
Winding System (Electrical Circuit System)
The 10kV high-voltage winding adopts a multi-layer cylindrical structure, using high-quality copper or aluminum conductors. Each turn is wrapped with DMD insulation, improving mechanical strength and enhancing resistance to short-circuit forces. The 0.4kV low-voltage winding is produced using copper foil, effectively reducing eddy current losses and improving heat dissipation. The insulation system applies Vacuum Pressure Impregnation (VPI) technology with Class H insulation materials rated up to 180°C, while vacuum oil injection eliminates internal air bubbles for optimized electrical performance.
Oil Tank and Cooling System
The transformer features a fully sealed corrugated steel oil tank designed to accommodate oil expansion without the need for an external conservator. This structure prevents oxygen and moisture intrusion, providing stable, maintenance-free operation. Cooling is achieved through natural oil circulation (ONAN), with corrugated fins that deliver efficient heat dissipation without requiring additional fan systems.
Protective Devices
Safety and monitoring components include a pressure relief valve that activates when internal pressure exceeds 35 kPa to prevent tank damage. A Buchholz relay detects gas accumulation caused by internal faults and initiates alarms or tripping circuits, standard for units above 315kVA. Additionally, PT100 sensor-based temperature monitoring systems provide real-time oil temperature tracking for enhanced operational safety.
Tap Changer
The transformer is equipped with a No-Load Tap Changer (NLTC) offering adjustable voltage ranges of ±5% or ±2×2.5% on the high-voltage side. Adjustments require de-energization, ensuring reliable voltage regulation and compatibility with varying grid conditions.
Bushings and Terminals
High-voltage bushings are made from porcelain or composite silicone rubber, providing a creepage distance of ≥25 mm/kV and enhanced anti-pollution flashover protection. Low-voltage terminals utilize tinned copper busbars with anti-oxidation treatment to ensure stable, high-current connections.
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Product Specifications
| Voltage Rating | Primary Side: 10 kV Secondary Side: 0.4 kV |
|---|---|
| Power Capacity | 315 kVA |
| Phase Configuration | 3-phase |
| Operating Frequency | 50/60 Hz |
| 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, 1 meter) |
| Standards Compliance | Meets IEC 60076, ANSI, and IEEE requirements |
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