SC(B) Resin Insulated Dry Type Transformer for 10kV Power Distribution Systems

Dry type transformers are widely used in power distribution systems where insulation performance, operating safety, noise control and installation conditions are important considerations. The SC(B) series resin insulated dry type transformer uses epoxy resin vacuum casting insulation for the complete winding and is designed for 10kV power distribution applications.

According to the supplied product information, the SC(B) series covers rated capacities from 30 to 2500kVA. It can be used in power stations, power plants, industrial and mining enterprises, high-rise buildings, user distribution stations and other power distribution systems.

Winding Structure of the SC(B) Dry Type Transformer

The low-voltage coil adopts a foil-type winding structure, while the high-voltage coil uses a trapezoidal segmented structure. This design helps reduce interlayer voltage stress and improves the transformer’s ability to withstand overvoltage conditions.

The entire winding is cast with resin to form an integrated insulation structure. According to the catalog, this structure also provides high mechanical strength and improved resistance to sudden short-circuit forces.

Low Partial Discharge Performance

Partial discharge is an important factor when evaluating the insulation condition of a dry type transformer. The supplied information states that the IEC standard test value for dry type transformers should not exceed 20pC under the specified test voltage.

For the SC(B) resin casting transformer series, the catalog states that the manufacturing process can control the local partial discharge test value below 5pC.

Lower partial discharge helps support the stability of the insulation system during transformer operation.

Strong Short-Circuit Resistance

The complete coil is resin cast and has high mechanical strength. This construction improves the ability of the winding to withstand mechanical forces generated during sudden short-circuit conditions.

For distribution transformers, this structural stability is important because electrical faults can produce significant electromagnetic forces inside the transformer.

Resistance to Lightning Impulse

The initial voltage distribution along a transformer winding can affect the insulation stress caused by lightning impulse voltage.

The SC(B) series uses an optimized high-voltage winding end structure so that the initial voltage distribution is closer to linear. According to the supplied information, this helps improve resistance to lightning impulse conditions.

Low-Noise Operation

Transformer noise can be an important consideration in commercial buildings, residential areas and other noise-sensitive installation environments.

The SC(B) resin casting series uses structural optimization and manufacturing measures intended to reduce operating noise. The supplied catalog states that the overall transformer noise can meet the requirements of noise-sensitive installation areas.

Energy Efficiency and Compact Structure

The transformer uses conductor materials, high magnetic permeability silicon steel sheets and an optimized core stacking process. These measures are intended to reduce losses while maintaining a compact transformer structure.

The combination of lower operating loss and compact construction can be useful for distribution projects where installation space and operating efficiency need to be considered together.

Insulation and Environmental Performance

The catalog states that the transformer uses F or H heat-resistance grade insulation. The resin-cast structure also provides flame-retardant, fire-resistant and moisture-resistant characteristics.

The product can therefore be considered for power distribution environments where humidity, fire resistance and insulation performance are important project requirements.

Typical Applications

• Power stations
• Power plants
• Industrial and mining enterprises
• High-rise buildings
• User distribution stations
• Urban power distribution systems

Main Technical Range

Product Series	SC(B)
Product Type	Resin Insulated Dry Type Transformer
Voltage Level	10kV
Rated Capacity	30–2500kVA
Low-Voltage Winding	Foil-Type Winding
High-Voltage Winding	Trapezoidal Segmented Structure
Insulation	Epoxy Resin Vacuum Casting
Heat Resistance Grade	F or H Grade

What Should Buyers Confirm Before Selection?

Before selecting a dry type transformer, buyers should confirm the required voltage level, rated capacity, installation environment and actual operating conditions.

For 10kV power distribution systems, the SC(B) series provides rated capacities from 30 to 2500kVA. The final transformer specification should be selected according to the actual electrical load, system configuration and project requirements.