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Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 1

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 2

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 3

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 4

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 5

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA

Dry-type transformers are transformers where the core and windings are not immersed in insulating liquid. The insulating medium is typically dry air or other gases.

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Structural Features

Core

Made of high-quality cold-rolled grain-oriented silicon steel sheets.

Often adopts a 45° full mitered joint to allow magnetic flux to pass along the joint direction, effectively reducing no-load loss, no-load current, and core noise.

Core columns are usually bound with Class F non-woven tape and encapsulated with epoxy resin.

Performance Features

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 7

Diverse Types

▪Wound type: Epoxy resin with quartz sand filling (cast resin)，Glass fiber-reinforced epoxy resin casting (thin insulation structure, widely used, prevents resin cracking, improves reliability)Multi-strand glass fiber epoxy-impregnated winding type

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 8

Low-Voltage Winding

▪Usually foil-wound structure with high-quality copper foil and Class H insulation.
▪Interlayer insulation with insulating paper, solidified via VPI for high mechanical strength and short-circuit resistance.

Dry-Type Transformer Retrofit / Replacement Project – 13.2kV / 4.16kV, 5MVA 9

High-Voltage Winding

▪Typically multilayer cylindrical or multilayer segmented structure.
▪Uses mechanically robust and well-ventilated continuous winding on an insulated cylinder.
▪Conductors are paper-insulated flat copper wires, with interlayer insulation using insulating paper.
▪Vacuum Pressure Impregnation (VPI) forms a solid structure, enhancing moisture resistance, thermal shock resistance, and reliability.
▪Partial discharge <5 PC, easy to recycle after lifespan.

product details

34 (2)

28 (2)

24 (3)

Enclosure & Protection

Enclosure

Supports the core and windings while providing protection.

Made of high-quality steel plates with varying protection levels

IP00 (no protection)

IP20 (prevents solid objects >12mm)

IP23 (protects against dripping water)

Materials

cold-rolled steel, stainless steel, etc.

Protection Function

Dry-type transformers effectively block external contaminants such as dust and moisture, protecting internal components to ensure stable operation in various environments.

Temperature Control System

Equipped with an intelligent temperature monitoring system.

Automatically detects and displays winding temperatures.

Controls fan start/stop, alarms, and trip functions.

Temperature relays trigger alerts if overheating occurs.

Cooling Methods

● Natural Air Cooling (AN)

Operates at rated capacity continuously via natural convection.Suitable for stable loads and moderate environments.

● Forced Air Cooling (AF)

Uses fans to enhance cooling, increasing capacity by 50%.

Performance Characteristics

High Safety

Eco-Friendly

Low Maintenance

High Mechanical Strength

Excellent Insulation

High Efficiency

Environmental Adaptability

Easy Installation

▪ No flammable resin or oil, reducing fire risk.

▪ Self-extinguishing, minimal smoke, and no toxic emissions.

Oil-free, eliminating leakage and pollution risks.

No oil checks or circulation, reducing upkeep costs.Equipped with protective enclosures and temperature control devices, we support air cooling, intelligent thermal protection, and real-time monitoring, further reducing maintenance efforts.

Strong short-circuit and thermal shock resistance.

Minimal partial discharge, high lightning impulse resistance.High thermal class (e.g., Class H: 180°C–220°C).

Low loss, low noise, and high operational efficiency.

Moisture-resistant, suitable for humid/salty conditions.

Compact and lightweight, they are easy to install and transport, and can be installed near the load center without requiring a special foundation,reducing installation time and costs.

Technical Parameters

Voltage Ratings	10kV, 20kV, 35kV, etc.
Capacity Range	30kVA–20,000kVA (e.g., SCB-11—1250kVA/10kV, SG12 series 100–2500kVA).
Frequency	50/60Hz.
Withstand Voltage	Typically 20,000V/min (tested with YZ1802 withstand voltage tester, 20mA).
Insulation Class	B, F, H, C (materials fiberglass-reinforced resin, NOMEX paper, etc.). Customizable.
Insulation Resistance	≥2MΩ (tested with ZC25B-4 megohmmeter, <1000V).
Connection Types	Y/Y, Δ/Y0, Yo/Δ, autotransformer (optional).
Winding Temperature Rise	e.g., 100K.
Cooling Modes	AN (natural) or AF (forced air).

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