High-voltage dry-type transformer
1. Dry and oil-free: fireproof, explosion-proof, environmentally friendly, with no risk of fire or leakage.
2. Safe and reliable: Class F insulation, low partial discharge, high short-circuit resistance.
3. Energy-saving and low consumption: low losses, energy savings during long-term operation.
4. High environmental adaptability: moisture-proof and dust-proof, usable in humid and dusty conditions.
5. Maintenance-free: no oil required, no daily maintenance needed, low operating and maintenance costs.
6. Easy to install: compact size, can be installed indoors/in basements.
7. Low noise level, suitable for residential areas, commercial and industrial premises, etc.
1. Product Introduction
SCB is a three-phase distributiontransformerdry-type transformer of class 10 kV, manufactured by vacuum casting using epoxy resin. High-quality cold-rolled silicon steel is used as the core material, and the copper windings are solidified by vacuum epoxy casting. It is oil-free and has a class F insulation system.
The product meets explosion-proof requirements, is maintenance-free, has high short-circuit resistance, and adapts well to environmental conditions. It is suitable for indoor installation and in distribution panels, and is also a cost-effective solution for renovation projects and projects with limited budgets.
2. Technical parameters (customizable)
2.1 Main features
Element |
Standard value |
Rated voltage |
High Voltage: 10 kV (6/6.3/10.5/11 kV optional); Low Voltage: 0.4 kV |
Rated capacity |
10–5000 kVA |
Phase / Frequency |
Three-phase, 50 Hz |
Connection Group |
Dyn11 (recommended), Yyn0 |
Tap Regulation |
Off-circuit tap adjustment; adjustment range: ±2×2.5% or ±5% |
Cooling Mode |
AN (natural cooling) / AF (forced air cooling) |
Insulation class |
Class F; maximum permissible temperature 155℃; temperature rise 100K. |
Protection degree |
IP00/IP20 (for indoor use); IP40 (protection against ingress of solid foreign objects) |
2.2 Key electrical characteristics
Insulation level: withstands power frequency voltage of 35 kV, withstands lightning impulse of 75 kV for 10 kV class.
Partial discharge: ≤10 pC at 1.3 Um/√3
Short-circuit impedance: 4–6% (6% for 1000 kVA)
Overload capability: 120–140% of rated load continuously in AF mode.
Noise level: ≤55–65 dB(A) according to JB/T 10088
3. Main Features
Safe, oil-free, fire and explosion proof.
Vacuum epoxy casting with fiberglass reinforcement, fire-resistant and self-extinguishing. No risk of oil leakage, fire, or explosion. Copper windings encapsulated in resin provide good theft protection.
Reliable and impact-resistant
Low partial discharge, high insulation strength, and excellent resistance to lightning impulse surges. High mechanical strength of windings ensures outstanding short-circuit resistance.
Low losses, low noise, and energy saving.
Three-step stepped core design and high-quality silicon steel reduce no-load and load losses. Optimized design ensures low noise, making the device suitable for residential and commercial areas.
High environmental adaptability and maintenance-free.
The windings are moisture-proof and dust-proof, ensuring stable operation in humid and dusty conditions. No pre-drying is required before restarting. The oil-free design guarantees virtually uninterrupted operation without the need for maintenance.
Simple installation and intelligent control
Compact and lightweight; no oil tank or fire barrier required. Supports indoor/basement installation to reduce power loss. Standard intelligent temperature controller with overheat alarm, shutdown function, and remote monitoring via RS485.
4. Applications
Recommended applications
Upgrading existing systems: replacing old transformers in residential areas, factories, and substations.
Locations with high fire safety requirements: high-rise buildings, basements, shopping malls, hospitals, schools, subways, airports, and train stations.
Harsh environmental conditions: chemical parks, mines, oil fields, tunnels, coastal areas with high humidity, dusty, flammable, and explosive areas.
