SG10 Non-Encapsulated H-Class Three-Phase Dry-Type Power Transformer

Q: What does H‑Class insulation mean?

H‑Class insulation indicates a maximum temperature rise capability of 180 °C , making the transformer suitable for higher thermal loads and applications requiring better heat endurance.

Q: Why choose a dry‑type transformer over an oil‑immersed one?

Dry‑type transformers are safer indoors (no oil fire hazard), require lower maintenance , and are environmentally friendly . They are ideal for buildings, hospitals, shopping centers, residential complexes, and any space with strict fire or environmental requirements.

Q: Where are dry‑type transformers typically installed?

These transformers are commonly installed in commercial buildings, industrial facilities, data centers, airports, hospitals, schools , and other indoor or semi‑closed environments where safety and low maintenance are priorities.

Q: What are the main components inside a dry‑type transformer?

Key components include the magnetic core, windings, insulation materials, cooling ducts, HV/LV bushings , and terminal connections designed for three‑phase power transformation.

Q: How does a dry‑type transformer handle heat dissipation?

Dry‑type transformers rely on natural air circulation (AN) or forced air cooling (AF) through ventilation ducts, cooling fans, or heat‑dissipating sections to keep operating temperatures within safe limits.

Q: What are the advantages of non‑encapsulated over encapsulated dry‑type transformers?

Non‑encapsulated units typically have better heat dissipation, easier maintenance access, and lower cost for comparable ratings, while still providing reliable performance in appropriate environments.

Q: What maintenance is required for dry‑type power transformers?

Routine maintenance usually includes visual inspections , cleaning dust and debris , checking terminal tightness , monitoring temperature , and ensuring ventilation paths are unobstructed to maintain performance and longevity.

The SG10 Non-Encapsulated H-Class Three-Phase Dry-Type Power Transformer is a reliable, efficient, and eco-friendly solution designed for high-demand applications. With advanced design, robust structure, and elegant appearance, this electrical transformer offers superior safety, fire resistance, explosion prevention, and zero harmful emissions. It is ideal for environments with stringent fire safety requirements or fluctuating loads, such as high-rise buildings, airports, train stations, power substations, hospitals, power plants, shopping malls, and residential areas.

Key Features:

The SG10 non-sealed H-class three-phase dry-type power transformer features H-class insulation and a non-sealed impregnation structure. The windings are treated with vacuum pressure impregnation, offering high temperature resistance, excellent heat dissipation, strong overload capacity, flame retardancy, fire resistance, and environmental protection without pollution. It also has low noise, short circuit resistance, and is moisture and dust-proof. With reliable operation and easy maintenance, it is an energy-efficient, safe, and environmentally friendly dry-type transformer, suitable for indoor distribution scenarios where fire safety and reliability are crucial.

Why choose the SG10 series non-encapsulated transformers

SG10 H-Class Dry-Type Transformers are engineered with precision and built to meet international standards, ensuring optimal electrical and mechanical performance throughout their lifecycle. Designed for environments requiring robust fire protection and reliable energy delivery, they are particularly suitable for heavy industries, petrochemical facilities, nuclear power stations, and highly populated areas.

High and low-voltage coils are made with Nomex insulation, ensuring excellent thermal and mechanical properties.

Advanced vacuum pressure impregnation technology guarantees durable insulation and prevents partial discharges under all operating conditions.

Optimized for challenging environments, this transformer manufacturer solution provides unparalleled reliability and safety.

Product Advantages

High-Performance Coils: Both high and low-voltage coils utilize Nomex insulation materials and are treated with advanced vacuum pressure impregnation (VPI) technology. This ensures excellent insulation, sealed with high-strength H-class materials, preventing partial discharge.

Improved Reliability: The high-voltage coil features a continuous structure with superior mechanical strength and excellent heat dissipation. This avoids the drawbacks of traditional multilayer cylindrical coils, such as poor cooling, high interlayer voltage, and vulnerability to heat breakdown.

Enhanced Durability: The Nomex insulation material used allows the high and low voltage coils to operate reliably in environments above 200°C for extended periods, ensuring stable performance, adapting to harsh operating conditions, and ensuring a long product lifespan.

Eco-Friendly Design: The transformer is fire-resistant, explosion-proof, and free from harmful gases, ensuring a safe, clean, and low-maintenance operation, perfectly suited for power substations and other critical facilities.

Operating Conditions

Ambient Temperature: -25°C to +40°C.

Relative Humidity: Daily average ≤ 95%, monthly average ≤ 90%.

Altitude: ≤1000m.

Installation: Suitable for areas without fire, explosion hazards, or severe vibration.

Application

The SG10 non-cooled H-class three-phase core-type power transformer adopts H-class high-temperature-resistant insulation and impregnated non-cooled structure. It has excellent heat dissipation performance, strong overload capacity, flame retardancy and environmental friendliness, and is reliable in operation. It is mainly suitable for indoor areas with high requirements for fire safety, heat dissipation conditions, and long-term continuous operation. It is widely used in distribution scenarios such as shopping malls, hospitals, schools, high-rise residences, data centers, industrial and mining enterprises, power plants, substations, etc.

Model meaning

Technical Parameters

Overall and mounting dimensions(mm)（Reference）

Model meaning

SG10-XXX/10 (11)	S:	Three-phase power transformer
	G:	Dry-type (non-encapsulated, non-immersed)
	10:	Design series / performance level
	XXX:	Rated capacity (kVA)
	10/11:	Rated voltage 10kV or 11kV (high-voltage side)

Technical Parameters

Item	Specification
Rated Voltage	HV: 10 kV / 11 kV; LV: 0.4 kV
Rated Capacity	100–2500 kVA
Number of Phases / Frequency	Three-phase, 50 Hz
Vector Group	Dyn11
Insulation Structure	Non-encapsulated, impregnated winding
Insulation Class	Class H (high temperature resistance)
Cooling Method	AN (Air Natural) / AF (Air Forced)
Tap Changer	Off-circuit tap changer: ±2 × 2.5%
Impedance Voltage	4%–6%
Winding Material	All copper winding
Degree of Protection	IP00 / IP20 / IP23
Operating Environment	Indoor use, fire-resistant, flame-retardant, moisture-resistant, good heat dissipation

Overall and mounting dimensions(mm)（Reference）

SG10 Series Encapsulated Transformer Dimension Diagram

Custom SG10 Non‑Encapsulated H‑Class Three‑Phase Dry‑Type Power Transformer Solutions

(The values can be customized according to project requirements.)

If you have specific requirements for the SG10 non‑encapsulated H‑class three‑phase dry‑type power transformer, please contact us. Our team will review your system design and provide a tailored solution.

We can customize rated capacity, voltage class, cooling method, insulation level, winding configuration, and enclosure features to ensure reliable performance and long‑term stability in your power distribution system. The SG10 dry‑type transformer offers excellent safety, low maintenance, and high efficiency, making it suitable for industrial plants, commercial facilities, data centers, residential complexes, and utility applications.

FAQ

What is a dry‑type power transformer?

A dry‑type power transformer is an electrical transformer where the core and windings are cooled by air instead of insulating oil, making it safer for indoor installations and reducing fire/explosion risk.

What does “non‑encapsulated” mean?

“Non‑encapsulated” refers to dry‑type transformer windings that are not fully coated in resin. Instead, they are arranged without a full potting, allowing better ventilation and easier inspection and maintenance.

What does H‑Class insulation mean?

H‑Class insulation indicates a maximum temperature rise capability of 180 °C, making the transformer suitable for higher thermal loads and applications requiring better heat endurance.

Why choose a dry‑type transformer over an oil‑immersed one?

Dry‑type transformers are safer indoors (no oil fire hazard), require lower maintenance, and are environmentally friendly. They are ideal for buildings, hospitals, shopping centers, residential complexes, and any space with strict fire or environmental requirements.

Where are dry‑type transformers typically installed?

These transformers are commonly installed in commercial buildings, industrial facilities, data centers, airports, hospitals, schools, and other indoor or semi‑closed environments where safety and low maintenance are priorities.

What are common voltage and capacity ratings for this type?

Dry‑type transformers come in various voltage ratings (e.g., 690 V–35 kV depending on design) and power capacities (from tens of kVA to several MVA) to match different distribution needs.

What are the main components inside a dry‑type transformer?

Key components include the magnetic core, windings, insulation materials, cooling ducts, HV/LV bushings, and terminal connections designed for three‑phase power transformation.

How does a dry‑type transformer handle heat dissipation?

Dry‑type transformers rely on natural air circulation (AN) or forced air cooling (AF) through ventilation ducts, cooling fans, or heat‑dissipating sections to keep operating temperatures within safe limits.

What are the advantages of non‑encapsulated over encapsulated dry‑type transformers?

Non‑encapsulated units typically have better heat dissipation, easier maintenance access, and lower cost for comparable ratings, while still providing reliable performance in appropriate environments.

What maintenance is required for dry‑type power transformers?

Routine maintenance usually includes visual inspections, cleaning dust and debris, checking terminal tightness, monitoring temperature, and ensuring ventilation paths are unobstructed to maintain performance and longevity.

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