SG(B) Series Non-Encapsulated Dry Type Transformer

Non-encapsulated coil three-phase dry-type power transformers feature advantages such as safety, reliability, energy conservation, fire resistance, explosion protection, and easy maintenance. Boasting advanced design, reasonable structure and attractive appearance, their main performance indicators are superior to domestic standards, including partial discharge level, no-load loss, load loss, noise level, and adaptability to high-humidity environments. They can be installed in polluted and humid areas near lakes, seas and rivers, as well as regions with high fire protection requirements and heavy loads. These transformers are suitable for high-rise buildings, airports, stations, docks, subways, hospitals, power plants, metallurgical industries, shopping malls, densely populated residential areas, as well as petrochemical plants, nuclear power plants, nuclear submarines and other places.

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Description

Product Overview

The SG(B) series dry type transformer is a non-encapsulated three-phase power transformer designed for high-performance applications in challenging environments. This advanced transformer series incorporates state-of-the-art design principles and premium materials to deliver superior electrical performance, exceptional reliability, and enhanced environmental adaptability. Unlike encapsulated transformers, the SG(B) non-encapsulated dry type transformer features an open coil structure that provides excellent heat dissipation and allows for easy visual inspection of internal components. Its design exceeds national standards in key performance metrics, including partial discharge levels, energy efficiency, and noise reduction, making it the preferred choice for critical infrastructure projects worldwide.

Key Advantages

Advanced Electrical Performance

The three phase SG(B) power transformer utilizes high-grade grain-oriented silicon steel cores and precision-wound copper coils to achieve industry-leading electrical characteristics. It exhibits extremely low partial discharge levels (≤5pC), ensuring stable operation and extending the transformer's service life. The optimized magnetic circuit design minimizes core losses and reduces harmonic distortion, improving power quality for sensitive electronic equipment.

Exceptional Environmental Adaptability

One of the most significant advantages of the SG(B) series dry type transformer is its ability to operate reliably in harsh environmental conditions. The open coil structure, combined with special moisture-resistant insulation materials, allows the transformer to function effectively in high humidity, high temperature, and polluted environments. It can be installed near lakes, seas, rivers, and in coastal areas with high salt content in the air, as well as in industrial zones with heavy dust and chemical contamination.

Enhanced Safety and Easy Maintenance

The moisture resistant SG(B) transformer is completely oil-free, eliminating the risk of fire, explosion, and environmental pollution associated with oil-immersed transformers. Its non-encapsulated design allows for easy access to internal components, simplifying inspection and maintenance procedures. The transformer features a robust mechanical structure that provides excellent short-circuit resistance, ensuring uninterrupted power supply during electrical faults.

Technical Specifications

Model	Rated capacity (kVA)	Connection group label	Voltage combination (kV)	No-load loss (W)	Load loss (W) 120°C (F)	No-load current (%)	Short-circuit impedance (%)
SC13-30	30	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	135	640	2	4
SC13-50	50	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	195	900	2	4
SC13-80	80	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	265	1240	1.5	4
SC13-100	100	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	290	1410	1.5	4
SC13-125	125	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	340	1660	1.3	4
SC(B)13-160	160	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	385	1910	1.3	4
SC(B)13-200	200	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	445	2270	1.1	4
SC(B)13-250	250	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	515	2480	1.1	4
SC(B)13-315	315	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	635	3120	1	4
SC(B)13-400	400	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	705	3590	1	4
SC(B)13-500	500	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	835	4390	1	4
SC(B)13-630	630	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	965	5290	0.85	4
SC(B)13-630	630	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	935	5360	0.85	6
SC(B)13-800	800	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	1090	6260	0.85	6
SC(B)13-1000	1000	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	1270	7310	0.85	6
SC(B)13-1250	1250	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	1500	8720	0.85	6
SC(B)13-1600	1600	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	1760	10500	0.85	6
SC(B)13-2000	2000	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	2190	13000	0.7	6
SC(B)13-2500	2500	Yyn0 or Dyn11	HV: 10, 6.3, 6 Tap range: ±5%, ±2×2.5%, +3 or -1×2.5% LV: 0.4	2590	15400	0.7	6

Applications

The low partial discharge SG(B) transformer is suitable for a wide range of applications where high reliability and environmental adaptability are essential. Its typical applications include:

Coastal power distribution systems and port facilities

Petrochemical plants and refineries

Nuclear power plants and energy facilities

Subway systems and underground transportation

Metallurgical and mining industries

Large shopping centers and entertainment complexes

Hospitals with critical medical equipment

High-rise residential and commercial buildings

FAQ

What is the main difference between SG(B) and SC(B) transformers?

The primary difference lies in the coil construction. The SG(B) series dry type transformer features a non-encapsulated coil design, which provides better heat dissipation and easier maintenance, while the SC(B) series uses fully encapsulated epoxy resin coils for enhanced mechanical protection and moisture resistance.

Can the SG(B) transformer be installed outdoors?

While the high performance SG(B) dry type transformer is designed to withstand harsh environmental conditions, it is recommended to install it in a covered or enclosed area to protect it from direct rain and snow. We offer optional weatherproof enclosures for outdoor installations.

What energy efficiency standards do SG(B) transformers meet?

Our SG(B) series transformers exceed the requirements of national energy efficiency standards. They feature significantly lower no-load and load losses compared to traditional transformers, helping businesses reduce their energy consumption and carbon footprint.

Get a Custom Quote Today

Invest in the reliability and performance of our SG(B) series dry type transformers for your critical power distribution needs. We provide comprehensive solutions tailored to the unique requirements of industrial, commercial, and infrastructure projects. Our team of expert engineers will work with you to design a transformer solution that optimizes energy efficiency, enhances safety, and delivers long-term value. Contact us today at +86-15852118166 or email your specifications to baojia@hcbyq.com to receive a detailed, customized quote for your project.