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

1. Product Overview

The SG(B) series non-encapsulated dry-type transformer is an open-winding power distribution transformer developed for safe, stable and low-maintenance power supply scenarios. Different from traditional epoxy resin cast dry-type transformers, this product adopts a non-encapsulated bare winding structure, with high-quality oxygen-free copper wires for both high and low voltage windings and high-grade oriented cold-rolled silicon steel sheets for the iron core. Optimized winding layout and core stacking process effectively reduce operation loss and partial discharge.

With H-class high-temperature resistant insulation system, the transformer features outstanding heat dissipation, strong overload resistance and high operational stability. It requires no oil-filled structure, brings no fire, explosion or pollution risks, and fully complies with IEC international standards and national power industry specifications. This series of transformers has been widely recognized in civil and industrial power distribution fields for its reliable performance and convenient daily operation and maintenance.

2. Main Product Parameters

3. Core Product Features

This series of non-encapsulated dry-type transformers has obvious structural and performance advantages compared with traditional encapsulated products, focusing on practicality, safety and low operation cost:

• Open Non-Encapsulated Structure: The winding is fully exposed without epoxy resin encapsulation. Operators can directly observe the winding surface, connection terminals and insulation status, which makes daily inspection, fault investigation and partial maintenance more convenient and thorough, avoiding hidden dangers caused by internal invisible faults of encapsulated transformers.

• Superior Heat Dissipation & Overload Resistance: The open winding design forms a natural air circulation channel, with faster heat dissipation and more uniform temperature distribution. Matched with H-class high-temperature resistant insulating materials, the transformer can withstand short-term overload operation, with strong adaptability to fluctuating load working conditions.

• Low Loss & Energy Saving: The iron core adopts high-quality low-loss silicon steel sheets and full-level stacking process, which effectively reduces no-load loss, load loss and no-load current. Long-term operation can greatly reduce power consumption and create obvious energy-saving benefits for users.

• Safe & Environment-Friendly: No insulating oil is used in the whole machine, eliminating oil leakage, fire and explosion risks. No toxic or harmful gas will be released even under high-temperature operation or accidental overheating. It features zero pollution, low noise and meets modern environmental protection and fire safety requirements.

• Stable Insulation & Long Service Life: The overall insulation structure is reasonably optimized, with low partial discharge value and strong anti-aging and anti-humidity ability. It can operate stably in conventional indoor and semi-open environments, with a service life of more than 20 years under standard operating conditions.

• Simple Installation & Wide Adaptability: The equipment has a compact overall structure and light weight. No special fireproof wall or oil storage pit is required during installation, saving construction space and installation cost. Multiple protection grades can be selected to adapt to different on-site environmental conditions.

4. Application Scenarios

Due to its high safety, easy maintenance and stable performance, SG(B) series non-encapsulated dry-type transformers are widely applied in places with strict requirements for power supply safety, environmental protection and equipment accessibility:

• Commercial & Civil Buildings: Office buildings, shopping malls, hotels, residential communities, stadiums and other public building power distribution systems;

• Public Service Facilities: Hospitals, schools, scientific research institutions, data centers and other scenarios requiring continuous and stable power supply;

• Industrial Production Sites: Light industry, machinery manufacturing, electronic factories, metallurgy and chemical industry indoor power distribution workshops;

• Transportation & Underground Engineering: Subways, tunnels, underground comprehensive pipe galleries and other closed space power supply occasions;

• New Energy Projects: Photovoltaic power stations, wind power supporting distribution rooms, energy storage power stations and other new energy power supply systems;

• Special Working Conditions: Coastal humid environments, high-dust workshops and other harsh indoor working scenarios that are not suitable for oil-immersed transformers.

5. Daily Maintenance Guidelines

Scientific daily maintenance can effectively extend the service life of the transformer and ensure stable operation. The conventional maintenance work is simple and operable, with no complicated professional operations required:

• Regular Cleaning: Regularly remove dust and floating debris on the surface of windings, iron core and cooling fans to avoid dust accumulation affecting heat dissipation and insulation performance. Keep the equipment installation environment dry and clean.

• Structural Inspection: Periodically check the tightness of high and low voltage connection terminals, fasteners and insulating supports to prevent loose contact caused by long-term vibration, which may lead to overheating and discharge faults.

• Operation Monitoring: Observe the operating temperature through the supporting temperature controller in real time. For transformers equipped with forced cooling fans, regularly test the fan operation status to ensure normal heat dissipation under high load.

• Insulation Detection: Regularly measure the insulation resistance of windings. If the resistance value drops abnormally or dampness is found, stop operation in time for dehumidification and maintenance to avoid insulation breakdown.

• Environment Management: Keep the distribution room well ventilated, avoid long-term humid, corrosive gas and conductive dust erosion, and ensure the transformer operates within the standard temperature and humidity range.

6. After-Sales Service Support

We provide full-cycle professional after-sales services for all SG(B) series transformers, solving customers' installation, operation and after-sales problems in one stop:

• Installation & Commissioning Guidance: Provide professional on-site installation guidance, equipment commissioning and operational technical training to help on-site personnel master standard operation and daily maintenance skills.

• Long-Term Warranty Service: The whole machine enjoys a standard warranty of 24 months after commissioning or 30 months after factory delivery (whichever comes first). Free maintenance and replacement of defective parts caused by product quality problems during the warranty period.

• Fast Fault Response: Equipped with a professional technical after-sales team, providing 24-hour remote technical support. For complex on-site faults, arrange engineers to provide door-to-door maintenance services in the shortest time.

• Spare Parts Supply: Provide long-term original spare parts supply support to ensure the continuous and stable operation of customer equipment in the later stage.

• Customized Technical Support: Provide personalized parameter adjustment, structural optimization and transformation services according to customers' special working conditions and power supply requirements.