Substations house expensive high-voltage equipment and sensitive control cables, making fire safety a mandatory requirement.
Intrinsically Safe: The windings of an epoxy resin dry-type transformer are vacuum cast into a solid unit with epoxy resin, containing no insulating oil whatsoever. This completely eliminates the risks of oil leakage, oil spouting, combustion, and explosion associated with oil-immersed transformers.
Self-Extinguishing Flame Retardancy: The epoxy resin material itself has inherent flame-retardant properties. Even under an external flame, its surface forms a charred layer that does not support combustion and prevents the spread of burning oil. It fully meets the stringent fire protection codes for power installations.
Xinhong Advantage: Our epoxy resin casting process strictly controls material formulation and vacuum degree, ensuring each transformer is not only "oil-free" but also possesses excellent flame-retardant properties. They can be installed directly at the load center, adjacent to switchgear and other equipment, saving valuable space in the substation while upholding the highest safety standards.
Station service loads often exhibit short-term surge characteristics (e.g., starting large motors, circuit breaker charging), placing high demands on the transformer's overload capability.
High-Grade Insulation: Dry-type transformers commonly use Class F or Class H insulation (with maximum allowable temperatures of 155°C and 180°C respectively), offering excellent thermal performance.
Robust Overload Capability: With forced air cooling, dry-type transformers can operate continuously and withstand short-term overloads of 130%-150% without affecting service life. This thermal stability is a critical guarantee for handling impact loads within the substation.
Xinhong Advantage: As a qualified supplier for State Grid, Xinhong Electrical's dry-type transformers undergo rigorous temperature rise and overload tests. This ensures they provide stable and reliable power output for control and protection systems, even amidst complex load fluctuations in the substation.
Modern substations are increasingly moving towards minimal or unattended operation models, making equipment maintenance-free characteristics paramount.
Excellent Sealing: Epoxy resin cast windings offer good moisture and dust resistance. They can operate normally in 100% humidity and can be re-energized after shutdown without requiring drying or pre-heating.
Virtually Maintenance-Free: Unlike oil-immersed transformers requiring periodic oil sampling/testing, oil level checks, and leak management, dry-type transformers only need periodic cleaning of surface dust. Coupled with intelligent temperature control systems, they enable fault self-diagnosis, over-temperature alarm and trip, and can even integrate with background monitoring systems via RS485 interface for centralized supervision.
Xinhong Advantage: We understand the importance of operational costs for power companies. Xinhong dry-type transformers boast a long design life and feature near-zero consumption during operation. Combined with intelligent temperature control devices, they significantly reduce the manpower and capital investment required for maintenance throughout the substation's lifecycle.
Space inside substation buildings is at a premium, making equipment compactness a critical design consideration.
Space Saving: Dry-type transformers require no separate oil pit or emergency oil drainage facilities. They can be installed alongside switchgear, significantly reducing the footprint.
Ease of Installation: Their relatively lighter weight simplifies handling and installation, making them particularly suitable for underground substations or space-constrained retrofit projects.
Xinhong Advantage: Xinhong offers modularly designed dry-type transformers with a compact structure. This facilitates not only new substation construction but also capacity upgrades for older substations. Our technical team can provide optimal layout solutions based on your specific switchgear room dimensions.
Beyond the four main advantages, the specific epoxy resin casting process offers additional technical benefits for substations:
High Short-Circuit Withstand Strength: The windings, solidified into a rigid monolithic structurevia vacuum casting, possess extremely high mechanical strength. In the event of a short circuit on the low-voltage side, the windings can withstand immense electromagnetic forces without deforming or cracking. This acts as the final line of defense ensuring the power supply reliability of the station service system.
Low Partial Discharge: The high-quality casting process results in virtually no air voids inside the windings. Partial discharge levels can be controlled to very low values (e.g., ≤5pC), implying a longer insulation life and more reliable long-term operation.
At Xinhong Electrical Equipment Co., Ltd. , we are more than just an equipment manufacturer; we are a partner in power system safety and reliability. With over a decade of industry experience, our dry-type transformers are widely used in power transmission and distribution systems, high-rise buildings, industrial enterprises, and various special environments.
Professional Manufacturing: Our factory, located in Xuzhou, Jiangsu, holds SGS/BV certifications and is recognized as an excellent supplier for the State Grid Corporation of China. Our product quality stands up to the most rigorous scrutiny.
Full Product Range: We cover SC(B)10, SC(B)11, SC(B)13 series epoxy resin cast dry-type transformers, with capacity ranges from 30KVA to 10000KVA and voltage levels covering 6KV, 10KV, 20KV, and 35KV.
Flexible Customization:
Winding Material: Choice of copper or aluminum windings to meet different budget and performance needs.
Connection Group: Customizable for Dyn11 or Yyn0.
Protection Grade: Optional enclosures with IP20, IP30, IP40 ratings based on installation environment.
Technical Parameters: We offer in-depth optimized designs based on your specific load profiles, impedance requirements, temperature rise limits, etc.
Fast Response: We provide OEM/ODM services with a low MOQ of 1 unit and short delivery lead times (typically 5-10 working days), backed by lifelong technical support.
In summary, the epoxy resin dry-type transformer has become the mainstream choice for substation service transformers because it perfectly unifies the four core requirements: fire safety, electrical reliability, maintenance-free operation, and compact layout. It is not merely a voltage conversion device but the essential foundation ensuring the stable operation of the substation's "last line of defense" – its control, protection, and lighting systems.
If you are seeking reliable dry-type transformer solutions for a substation project, or need to upgrade existing equipment, please contact Xinhong Electrical. We will provide safe, efficient, and environmentally friendly power conversion solutions backed by our professional expertise, rich experience, and flexible customization capabilities.
Contact Us:
For more product information and technical parameters, please visit our Made-in-China homepage or send an inquiry directly to receive a customized technical proposal and quotation tailored to your project requirements!
