SG(B) Series Non-Encapsulated Dry-Type Transformer

The SG(B) Series Non-Encapsulated Dry-Type Transformer is a high-performance and highly reliable power transformer. It is manufactured with high-quality, grain-oriented silicon steel, offering excellent insulation performance, low losses, and low noise operation. Tested under strict quality control procedures and compliant with national standards, it is widely used in industrial and commercial applications, providing a safe, environmentally friendly, and efficient power supply solution.

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Scope of application

High-Density Occupancy Areas

Suitable for large commercial complexes and public buildings with strict fire safety requirements.

Underground Spaces

Ideal for underground or semi-underground substations, with a focus on efficient heat dissipation and enhanced safety redundancy.

High-Reliability Power Distribution

Suitable for critical load applications requiring continuous operation, with strong thermal stability and short-circuit withstand capability.

Product Description

1 Class H insulation with Class C insulating materials, offering strong overload capacity, excellent short-circuit withstand capability, and high operational safety.

2 Manufactured with high-quality, high-permeability silicon steel and multi-step lap core technology, ensuring low no-load loss.

3 Copper and silicon steel are recyclable, and the insulation materials are fully degradable, making it an environmentally friendly product.

4 Incorporates DuPont™ ReliatraN® core technology, reducing overall size and material usage by approximately 10%.

5 Enables fully intelligent data acquisition and analysis, acting as a smart “brain” for proactive operation and maintenance.

Product Features

Advanced Design Technology

Utilizes 3D and parametric design software, combined with over 20 years of in-house design and manufacturing experience, to achieve automated transformer design, cost optimization, and simulation analysis—ensuring advanced performance and high reliability.

High Reliability of HV Windings

The high-voltage windings adopt a continuous structure with high mechanical strength and excellent heat dissipation, eliminating the thermal and voltage distribution issues found in traditional multilayer designs. This ensures enhanced mechanical strength and reliability, with partial discharge levels below 5 pC for long-term stable operation.

High-Efficiency Core Design

The core is made of high-quality, grain-oriented silicon steel with a 45° step-lap joint structure and a special moisture- and corrosion-resistant coating. This design significantly reduces no-load loss, no-load current, and operating noise, while improving overall efficiency.

Strong Impact Resistance of LV Windings

The low-voltage windings adopt foil-type or longitudinal air-duct large-current helical structures, based on patented design. Treated with Vacuum Pressure Impregnation (VPI), they offer excellent short-circuit and impact resistance, along with strong protection against moisture, dust, and salt spray—ensuring reliable performance in complex environments.

Strict Quality Testing

Each transformer undergoes rigorous testing in accordance with national standards such as GB6450-1986 and JB/T standards, including partial discharge, lightning impulse, and noise tests—ensuring high quality and reliability.

Enhanced Cooling Performance

Features an open ventilation duct design combined with natural air cooling (AN) and forced air cooling (AF), providing better heat dissipation, controlled temperature rise, and improved overload capability.

Technical Advantages

R&D Cloud Platform

An integrated platform combining electromagnetic optimization design, parametric modeling, performance analysis, structural optimization, and automatic drawing generation. It enables efficient design resource sharing, as well as data management including search, modification, and version control.

Simulation Analysis

Advanced simulation capabilities covering fluid flow, thermal field, electric field, leakage magnetic field, transient processes, and short-circuit forces. Each product series is optimized through thermal and flow analysis to accurately determine winding temperature rise and hotspot distribution, ensuring reliable and stable performance.

Smart Operation & Maintenance Platform

By collecting key data such as temperature, current, voltage, vibration, and grid harmonics, the system enables real-time power quality analysis and fault alarms. It also supports mobile access for remote monitoring and intelligent operation management.

Capacity Range	50 kVA - 2500 kVA
Rated Voltage	6 kV、10 kV、35 kV
Frequency	50 Hz / 60 Hz
Insulation Class	Class F or Class H
Cooling Method	Natural Air Cooling (AN) / Forced Air Cooling (AF)
Vector Group	Dyn11 or Yyn0