CRT Transformer – Epoxy Resin Cast Resin Dry-Type

The SCB10 series represents advanced Cast Resin Transformer (CRT) technology, also known as Epoxy Resin Dry-Type Transformers. Designed for 10KV systems, these transformers eliminate the need for flammable oil, offering a safer, cleaner, and more environmentally friendly solution for power distribution. The SCB10 is vacuum-cast with epoxy resin, creating a solid, maintenance-free insulation system that is flame-retardant, explosion-proof, and highly reliable for critical installations.

Why Choose a Cast Resin Transformer (CRT)?

• Enhanced Safety: Flame-retardant (self-extinguishing), non-toxic, and produces minimal smoke. Ideal for indoor, populated, or sensitive environments like commercial buildings, hospitals, airports, and offshore platforms.
• Zero Maintenance: The sealed, solid epoxy resin insulation system is immune to moisture and contamination, eliminating the need for oil testing, filtering, or replacement.
• High Reliability & Long Life: Excellent resistance to thermal cycling, humidity, and short-circuit forces. Operates with minimal partial discharge, ensuring long-term insulation integrity.
• Environmentally Friendly: Contains no PCBs or flammable oils, posing no risk of soil or water contamination.
• Flexible Installation: Compact design allows installation directly in load centers, close to the point of use, saving space and reducing distribution losses.

Key Features of SCB10 Series

• Advanced Insulation: High-voltage windings are vacuum-impregnated and cast in epoxy resin, providing excellent dielectric strength and mechanical protection.
• Robust Core: Constructed from high-quality, grain-oriented cold-rolled silicon steel with a 45° step-lap joint to minimize no-load loss and noise.
• High Efficiency: Low no-load and load losses (meeting or exceeding efficiency class standards like SCB10/11/12/13) translate to significant energy savings over the transformer's lifetime.
• Thermal Management: Integrated temperature control with alarm and trip functions. Optional forced air cooling (AF) fans enable safe overload operation (e.g., 120% continuous, 140% for 3 hours).
• High Protection Degree: Standard enclosures offer protection levels like IP20 or IP23. Optional IP25 or higher for outdoor or harsh environments.
• Smart Monitoring (Optional): Compatibility with temperature control devices featuring RS485 interface for remote monitoring and integration into Building Management Systems (BMS).

SCB10 Series Technical Data (Highlights)

The following table outlines key specifications for the SCB10-30-2500/10KV model range. All designs comply with international standards IEC 60076-1 & 60076-11.

Note: Other capacities from 30 kVA to 2500 kVA are available. Custom voltage combinations (e.g., 10/0.415kV, 10/0.48kV) can be provided. Dimensions and weights are for reference; final drawings govern.

Typical Applications

• Commercial & Public Buildings: Shopping malls, hospitals, airports, data centers, office towers.
• Industrial Plants: Manufacturing facilities, chemical plants, mining operations.
• Infrastructure: Rail transit, tunnels, ports, water treatment plants.
• Renewable Energy: Wind and solar farm substations.
• Marine & Offshore: Ships, oil rigs, and platforms where safety is paramount.

Buyer's Guide: Selecting the Right CRT Transformer

To ensure optimal performance and value, consider these factors when specifying your SCB10 transformer:

• Capacity (kVA): Calculate your total connected and future load. Consider diversity factor to avoid oversizing.
• Voltage Rating: Confirm primary (e.g., 10KV, 11KV) and secondary (e.g., 400V, 480V) system voltages.
• Impedance (%Z): Standard is typically 4% or 6%. Choose based on your short-circuit level and coordination requirements.
• Losses (Efficiency Class): SCB10 offers good efficiency. For higher savings, inquire about SCB12 or SCB13 models with even lower losses.
• Cooling Type: AN (air natural) for standard duty. AF (air forced) with fans if periodic overloads are expected.
• Protection Degree (IP Code): IP20 for clean, indoor rooms. IP23 or higher for areas with potential condensation or light moisture.
• Enclosure Material: Options include cold-rolled steel (standard), stainless steel (corrosive environments), or aluminum alloy.

Installation & Handling

• Ensure the installation site is level, well-ventilated, and complies with clearances specified in the manual.
• Use the integrated lifting lugs for vertical hoisting. A forklift can be used with the base channels.
• For movement, utilize the holes in the transformer base. Do not drag or lift from any other point.
• Always follow local electrical codes and safety regulations during installation and commissioning.

Frequently Asked Questions (FAQ)

What is a CRT transformer?

A Cast Resin Transformer (CRT) is a dry-type transformer where the windings are encapsulated in a solid epoxy resin compound under vacuum. This provides superior insulation, safety, and makes it maintenance-free compared to liquid-filled transformers.

What is the difference between VPI and CRT?

VPI (Vacuum Pressure Impregnation) transformers have windings dipped in varnish and baked. CRTs (Cast Resin Transformers) have windings completely cast in solid epoxy resin. CRTs offer better moisture resistance, mechanical strength, and environmental safety, while VPI units may be more cost-effective for some standard applications.

Which transformer is used in TV?

Modern TVs and consumer electronics use very small, low-voltage switch-mode power supplies, not the large industrial power transformers like the SCB10. The SCB10 is designed for medium-voltage (10KV) power distribution in buildings and industry.

What is CTR in transformers?

CTR commonly stands for Current Transformer Ratio in instrumentation. In the context of Cast Resin Transformers, "CRT" is the correct abbreviation. Do not confuse it with instrument current transformers.