Product Overview
The 50kVA Dry Type Transformer is a cast resin distribution transformer utilizing copper windings, configured for standard 10kV to 0.4kV step-down applications on 50Hz grid networks.
Application & Selection Guide
1. What Small-Scale Applications Does a 50 kVA Transformer Suit?
A 50 kVA dry-type transformer is a compact, safe, and efficient power solution for small to medium-scale operations. It can handle a total connected load of approximately 40 kW to 50 kW (assuming a power factor of 0.8 to 1.0). This makes it a perfect fit for:
Small Factories & Workshops：Ideal for auto repair shops, woodworking studios, metal fabrication workshops, small printing houses, and packaging lines that operate a handful of motor-driven machines (e.g., lathes, grinders, compressors, welding equipment).
Schools & Educational Facilities ：Provides reliable power for classroom buildings, laboratory equipment, computer labs, lighting, and HVAC systems in schools, training centers, and university departments.
Small Commercial Premises ：Suitable for powering convenience stores, small supermarkets, boutiques, restaurants, fast-food outlets, beauty salons, and small offices, where the load consists mainly of lighting, HVAC, refrigeration, and point-of-sale systems.
Community & Public Facilities ：Can serve as a power source for community centers, small clinics, libraries, places of worship, and pumping stations with moderate and steady power demands.
2. Why Dry-Type Transformers Are Ideal for These Small-Scale Sites?
For the types of small-scale, often indoor or human-centric environments listed above, the inherent advantages of dry-type (cast resin) transformers offer significant benefits over traditional oil-filled units:
| Advantage | Benefit for Small Sites |
|---|---|
| Fire Safety | Oil-free, self-extinguishing solid insulation eliminates fire risk, making it safe for installation in basements, near wooden structures, or in crowded public spaces without costly fire suppression systems. |
| Space-Saving | Compact, lightweight design (due to high-density foil winding) allows for easy installation in tight electrical rooms, on mezzanines, or inside machinery enclosures where space is at a premium. |
| Clean & Safe | No risk of oil leaks, eliminating environmental hazards and messy cleanups. This is particularly important for schools, food establishments, and retail environments. |
| Low Noise | Low noise emission (as highlighted in Key Advantages) makes it suitable for noise-sensitive environments like schools, libraries, and clinics, ensuring minimal disturbance. |
| Minimal Maintenance | The solid-state structure eliminates the need for regular oil quality testing and filtration. Routine maintenance is limited to simple visual inspections and cleaning, which is a major plus for small businesses without dedicated maintenance staff. |
3. Differences Between 50 kVA and 100 kVA Dry-Type Transformers
Choosing the right capacity is a critical decision. Here is a simple comparison to help your customers decide between these two common sizes:
| Consideration Factor | 50 kVA Transformer | 100 kVA Transformer |
|---|---|---|
| Suitable For | Small workshops, single-machine shops, small retail, schools, clinics. Total load ~40-50 kW. | Larger workshops, community plazas, multi-story small offices. Total load ~80-100 kW. |
| Physical Size & Weight | Smaller, lighter, easier to handle and install in very confined spaces. | Larger and heavier; requires more substantial floor space and easier access for installation. |
| Initial Investment | Lower purchase, shipping, and installation costs. Budget-friendly for small projects. | Higher upfront capital expenditure. |
| Operational Losses | Lower absolute losses (after correcting page data), resulting in minimum energy waste for its capacity. | Higher absolute losses, leading to greater energy costs over time. |
| Future Load Growth | Limited headroom; adding significant new equipment (e.g., a large machine) may risk overloading. | Offers more spare capacity, allowing for some future expansion (e.g., adding a few more machines or HVAC units) without immediate replacement. |
Simple Selection Rule ：
Choose the 50 kVA transformer if your current total calculated load is below 40 kW, your budget and physical space are limited, and you foresee minimal load growth in the next 3-5 years.
Choose the 100 kVA transformer if your load is already close to 50 kW, you have the space, and you plan to expand your operations or add significant new equipment.
Scope of Supply
Product: Cast resin type transformer;
Number of phases: Three-phase;
Rated power: 30KVA - 3150KVA dry type transformer;
Primary voltage: 10,000V;
Secondary voltage: 400V;
Frequency: 50Hz;
Vector Group: Dyn11;
Customizable production: Available.
Technical Specifications
|
Model |
SCB11-50kVA-10/0.4 |
|
Type |
Dry type Transforme |
|
Standard |
IEC60076 |
|
Rated Power |
50kVA |
|
Frequency |
50HZ |
|
Phase |
Three |
|
Cooling Type |
ANAF |
|
Primary Voltage |
10 KV |
|
Secondary Voltage |
0.4KV |
|
Winding Material |
Copper |
|
Vector Group |
Dyn11 |
|
Impedance |
4% |
|
Tap Changer |
NLTC |
|
Tapping Range |
±2*2.5% @ Primary Side |
|
No Load Loss |
0.18 kW - 0.25 kW |
|
On Load Loss |
0.9 kW - 1.3 kW Load Loss (at 75℃ |
Transformer Process Flow Diagram
Transformer drawings
Customization Capabilities
| Customization Vector | Engineering Specification & Factory Capability |
|---|---|
| Vector Group Adaptation | Tailored winding configurations integrate seamlessly with onsite phase-angle distribution. |
| Dimensional Modification | Altered enclosure dimensions comply with restricted structural spaces and retrofits. |
| Terminal Placement | Busbar and cable entries are customized for top, bottom, or side connections. |
| Harmonic Engineering | Design variants incorporate K-factor shielding to handle severe non-linear loads. |
| Auxiliary Integration | Enclosures support custom integration of temperature controllers, heaters, and arrestors. |
Quality Control & Shipment
Quality Control:
- Thermal Control Validation
Fan and temperature controller testing ensures automated cooling activation at predefined thermal thresholds.
- Dielectric Safety Profiling
Withstand voltage and partial discharge testing ensures insulation complies with IEC 60076-11 dielectric specification boundaries.
- Loss & Impedance Audit
No-load and load loss measurements confirm operational efficiency and impedance parameter compliance.
Shipment & Logistics:
- Fumigation-Free Crate Fabrication
Enclosures are packed within compliance-ready, fumigation-free wooden boxes for international shipping clearance.
- Internal Chassis Immobilization
Internal anchoring mechanisms secure the base frame to prevent shifting during transit.
FAQ
Q: Can the enclosure withstand aggressive outdoor deployment?
A: Heavy-gauge steel panels coated with zinc-rich primer ensure structural corrosion resistance in marine and industrial atmospheres.
Q: Are specialized instruments calibrated prior to factory testing?
A: All diagnostic equipment undergoes scheduled calibration under ISO/IEC 1725 accredited standards, with traceability reports supplied inside the technical file.
Q: What specific customs documentation accompanies international freight?
A: Shipments include standardized commercial invoices, packing lists, originating certificates, and signed quality inspection records.
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