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As a professional manufacturer with a strong export footprint, Jinhua Dika Electrical Equipment Co., Ltd. specializes in delivering reliable and efficient power distribution solutions. Our Cast Resin Dry Type Transformers, available in 800kVA and 1000kVA ratings for 20kV medium voltage input, are engineered for superior performance in demanding indoor applications. We combine robust manufacturing processes with a commitment to quality, ensuring our transformers provide a safe, maintenance-free, and environmentally friendly alternative to traditional liquid-filled units, perfectly suited for commercial complexes, industrial plants, hospitals, and data centers where fire safety and space are critical concerns.
These transformers are designed with the end-user in mind, offering significant advantages over conventional options. The core and windings are encapsulated in a solid, inert epoxy resin under vacuum pressure, which provides exceptional protection against moisture, dust, and corrosive atmospheres. This cast resin construction eliminates the risk of oil leaks and fire hazards, making them ideal for installation in populated buildings or sensitive environments. Furthermore, they require minimal maintenance, contributing to lower total cost of ownership over their extended service life.
Key Technical Features and Specifications:
- Advanced Insulation System: Utilizing high-grade epoxy resin ensures excellent dielectric strength, thermal conductivity, and resistance to thermal cycling, preventing partial discharges and ensuring long-term reliability.
- Low Loss Design: Optimized core materials and winding techniques minimize no-load and load losses, leading to high energy efficiency and reduced operational costs.
- Enhanced Safety: Self-extinguishing resin material and the absence of flammable liquids make these transformers inherently fire-resistant. They are also non-toxic and do not release harmful substances, supporting a healthier indoor environment.
- Robust Mechanical Strength: The cast resin block provides high resistance to short-circuit forces and mechanical shocks, ensuring structural integrity under fault conditions.
- Flexible Configuration: Available with various tap changers, protection devices (like temperature controllers and surge arresters), and enclosure options (IP20, IP23 for dust and water protection) to meet specific project requirements.
Below is a summary of primary specifications for the standard models:
| Parameter | Specification |
|---|---|
| Rated Power | 800 kVA, 1000 kVA |
| Primary Voltage (HV) | 20 kV (Other MV levels available upon request) |
| Secondary Voltage (LV) | 400V, 415V, 480V, or as required |
| Frequency | 50 Hz / 60 Hz |
| Vector Group | Dyn11, Yyn0, or others |
| Insulation Class | Class F (155°C) standard, Class H (180°C) optional |
| Cooling Method | AN (Air Natural) or AF (Air Forced) |
| Sound Level | Low noise design, specific dB(A) levels customizable |
| Standards | Designed per IEC 60076-11 & IEEE C57.12.01 |
The benefits for your operation are clear and measurable. By choosing our cast resin dry-type transformers, you gain a power distribution component that ensures uninterrupted operation with high reliability, reduces the need for costly fire suppression systems, and simplifies installation due to lighter weight compared to oil-filled units. Their compact footprint saves valuable floor space, and their silent operation is suitable for noise-sensitive areas. Ultimately, this translates into enhanced system safety, lower lifecycle costs, and compliance with stringent environmental and building codes.
Backed by Jinhua Dika's manufacturing expertise and a commitment to international quality standards, our transformers are trusted by clients across diverse markets including North America, Southeast Asia, Europe, and Oceania. With an annual export value reflecting our global reach and a dedicated team ensuring every unit meets rigorous performance criteria, we provide not just a product, but a dependable power solution. We encourage you to contact us to discuss your specific 20kV indoor transformer needs, request detailed technical data sheets, or explore customization options for your next project.
Frequently Asked Questions (FAQ):
-
Q: What are the main advantages of a cast resin dry-type transformer over an oil-immersed one for indoor use?
A: The primary advantages include enhanced fire safety (no flammable oil), environmental friendliness (no risk of soil/water contamination), reduced maintenance needs, and suitability for installation in populated buildings due to lower fire hazard classification. -
Q: Can this transformer be used in outdoor installations?
A: The standard model is designed for indoor application. For outdoor installation, a specific weatherproof enclosure (e.g., IP54 rated) would be required, which can be provided as a customizable option. -
Q: What is the typical installation clearance required around the transformer for proper ventilation?
A> Adequate clearance is crucial for cooling. Generally, a minimum of 300-600mm clearance on all sides (except the wall) is recommended. Exact requirements depend on the cooling method (AN/AF) and are detailed in the installation manual. -
Q: How do I monitor the operating temperature of the transformer?
A: Our transformers can be equipped with integrated temperature monitoring systems, typically including PT100 sensors embedded in the windings connected to a local or remote display/control unit, providing real-time thermal protection. -
Q: Are these transformers compatible with both 50Hz and 60Hz power systems?
A: Yes, the design can be optimized for either 50Hz or 60Hz operation. Please specify your system frequency when inquiring or placing an order to ensure correct performance. -
Q: What is the expected operational lifespan of your cast resin transformer?
A: With proper application and within specified operating conditions, our cast resin transformers have a design life expectancy exceeding 30 years, thanks to the durable encapsulation and high-quality materials used. -
Q: Do you offer different impedance values?
A: Yes, standard impedance values are offered, and non-standard impedance can be engineered based on your specific system short-circuit level requirements. This is a common customization. -
Q: What after-sales support and warranty do you provide?
A: We provide comprehensive technical documentation and a standard warranty period. Specific warranty terms and after-sales support, including spare parts availability, are detailed in our commercial agreement.
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