SGB10/11 Series Non-Encapsulated Coil Dry-Type Transformers Product Introduction

SGB10/11 Series Non-Encapsulated Coil Dry-Type Transformers Product Introduction

1. Product Overview

The SGB10/11 series non-encapsulated coil dry-type transformers are upgraded and optimized power distribution equipment developed based on mature dry-type transformer manufacturing technology, strictly complying with international IEC standards and national industrial specifications. Different from traditional resin-encapsulated dry-type transformers, this series adopts a non-encapsulated open coil structure paired with vacuum pressure impregnation (VPI) process, using high-performance H-class Nomex insulating materials throughout the winding system.

This structural and technological design effectively solves common problems such as resin cracking, partial discharge attenuation and difficult heat dissipation of encapsulated transformers during long-term operation. With low loss, low noise, high safety and strong environmental adaptability, the SGB10/11 series covers conventional and high-efficiency upgraded models, meeting the differentiated power distribution needs of various industrial and civil scenarios. It has stable mechanical and electrical performance throughout the service life, and will not produce toxic gas or open flame combustion under abnormal working conditions, being a safe and environmentally friendly power transmission and transformation device.

2. Core Product Parameters

The SGB10/11 series supports multi-specification customization, covering common power distribution voltage levels and capacity ranges. The core universal parameters are listed in the table below, and special parameters can be adjusted according to on-site working conditions and user requirements.

3. Product Core Features

3.1 Superior Safety and Flame Retardancy

Different from encapsulated transformers with flammable resin materials, the SGB10/11 series adopts non-combustible H-class insulating materials with no resin wrapping on the coil surface. The whole machine has excellent flame retardant and explosion-proof performance, will not burn spontaneously or release toxic and harmful gases under overload, short circuit and high temperature extreme conditions. It has passed professional E2, C2, F1 environmental and safety tests, with no explosion risk during operation, which greatly improves the safety of power distribution system operation.

3.2 Low Loss and Energy Saving

The series adopts high-quality cold-rolled grain-oriented silicon steel sheets and optimized core structure design, combined with professional electric field and temperature field simulation analysis. Compared with conventional dry-type transformers, SGB10 model reduces no-load loss significantly, while SGB11 upgraded model further optimizes the winding layout and magnetic circuit structure, with lower operating energy consumption. Long-term grid operation can effectively reduce power loss and operation cost, meeting industrial energy-saving and emission reduction requirements.

3.3 Strong Environmental Adaptability

The non-encapsulated open coil structure and vacuum impregnation process make the transformer have excellent moisture-proof, dust-proof and anti-pollution capabilities. The H-class insulation system can stably operate in high temperature, humid and slightly corrosive environments, without insulation aging or performance degradation caused by environmental factors. It is not sensitive to daily temperature and humidity changes, and can adapt to indoor and semi-outdoor complex working conditions.

3.4 Convenient Maintenance and High Reliability

The open non-encapsulated coil structure completely avoids common faults such as resin cracking, peeling and internal hollowing of encapsulated transformers. The internal winding and core structure are intuitive and easy to inspect, clean and maintain on a daily basis. The whole machine has strong short-circuit resistance and overload capacity, and can bear short-term overload operation without equipment damage. The stable partial discharge performance ensures no hidden insulation dangers in long-term continuous operation, with extremely low failure rate.

3.5 Low Noise and Stable Operation

Through optimized core lamination process and winding damping design, the transformer effectively suppresses electromagnetic vibration and operating noise. The SGB11 upgraded model further optimizes the overall structural damping, with lower operating noise, no electromagnetic resonance in the working frequency band, and will not cause noise interference to the surrounding working and living environment.

4. Application Scenarios

Thanks to its high safety, strong environmental adaptability and low maintenance cost, the SGB10/11 series non-encapsulated coil dry-type transformers are widely used in scenarios with high fire protection requirements, dense personnel and complex working conditions, covering civil construction, industrial production, public infrastructure and other fields.

4.1 Civil and Commercial Buildings

Suitable for high-rise residential buildings, commercial shopping centers, office buildings, hotels and other densely populated places. The flame-retardant and explosion-proof design eliminates fire hazards in building power distribution, and low-noise operation ensures a comfortable indoor environment. It can be installed in power distribution rooms, shaft spaces and other indoor areas to provide stable power supply for building lighting, elevators, HVAC and other systems.

4.2 Public Infrastructure

Widely applied in airports, railway stations, subway stations, hospitals, schools and other key public facilities. These scenarios require high power supply stability and safety. The product’s low failure rate, no toxic gas emission and strong continuous operation capability can fully meet the long-term stable power demand of public infrastructure and avoid power supply interruption affecting public operation.

4.3 Industrial and Mining Enterprises

Applicable to metallurgy, chemical industry, machinery manufacturing, mining and other industrial scenarios with large load fluctuation and harsh environment. The strong overload resistance and anti-pollution performance can adapt to the unstable load operation of industrial equipment, and the open structure is convenient for daily maintenance in industrial sites, effectively reducing equipment downtime caused by failure.

4.4 Special High-safety Scenarios

It can be used in petrochemical, new energy power stations, nuclear power auxiliary facilities and other flammable and explosive special environments. The non-combustible fully dry-type structure completely avoids the safety risks of oil-immersed transformers such as oil leakage and combustion, and is the preferred power distribution equipment for high-risk environmental power supply systems.

5. Product Maintenance and After-sales Service

5.1 Daily Maintenance Guidelines

The SGB10/11 series dry-type transformers feature low maintenance design, and daily routine maintenance is simple and efficient. First, regularly check the coil surface for dust accumulation, and clean the surface dust and sundries with dry compressed air every 3-6 months to ensure good heat dissipation of the open coil. Second, regularly inspect the connection terminals for looseness or oxidation, and fasten and polish the oxidized parts in time to avoid poor contact and heating. Third, check the operating temperature and noise of the transformer regularly, confirm the normal operation of the temperature control and cooling system, and eliminate abnormal vibration and noise hidden dangers in time.

In humid seasons or humid operation environments, regular insulation resistance detection is required to ensure the insulation performance of the winding system meets the standard. Avoid long-term overload operation beyond the rated parameter range, which can effectively extend the service life of the equipment. There is no need for oil replacement and sealing maintenance throughout the whole life cycle, which greatly reduces daily operation and maintenance costs.

5.2 Fault Handling Instructions

In case of abnormal temperature rise, excessive noise or tripping protection during equipment operation, the power supply shall be cut off immediately for inspection. Non-professional personnel are not allowed to disassemble the equipment privately. For minor faults such as loose wiring and surface dust accumulation, they can be handled according to the operation manual; for internal electrical faults and component damage, users need to contact the after-sales team in time for professional maintenance.

5.3 After-sales Service Commitment

We provide one-year full warranty service for the whole machine and three-year warranty for core components (iron core, winding). During the warranty period, any quality failure caused by product design and manufacturing problems will be repaired and replaced free of charge. We support 24-hour online technical consultation and after-sales response, and arrange professional engineers to provide on-site debugging, maintenance and fault handling services for on-site equipment problems.

In addition, we provide lifelong paid maintenance and technical upgrading services for all products, regularly provide users with equipment operation guidance and maintenance training, and customize exclusive operation and maintenance schemes according to user’s on-site working conditions and equipment operation cycle, ensuring the long-term stable and efficient operation of the transformer equipment.