The Epoxy Resin Cast Dry-Type Power Transformer represents a new generation of high-performance dry-type transformers, engineered by integrating advanced international technology with extensive manufacturing expertise. Designed to meet the highest contemporary standards, including IEC 60076 and GB/T 10228, this series offers superior safety, reliability, and environmental resilience. Its robust, maintenance-free design, utilizing either advanced vacuum-cast epoxy resin or high-temperature Nomex® paper insulation systems, makes it the ideal power distribution solution for mission-critical and demanding environments such as high-rise buildings, commercial centers, industrial plants, and public infrastructure.
Product Features
• Dual Advanced Insulation Systems
Features two premier insulation options: the SG(B)9-11 series with glass-fiber reinforced, thin-insulation epoxy resin vacuum-cast coils, ensuring a void-free, monolithic structure; and the SC(B)9-11 series utilizing DuPont Nomex® paper insulation with multiple Vacuum Pressure Impregnation (VPI) processes, forming a solid, mechanically strong coil block. Both offer exceptional dielectric strength and moisture resistance.
• Enhanced Safety & Fire Resilience
As a dry-type transformer with no flammable oil, it significantly reduces fire and environmental hazards. The flame-retardant materials and solid insulation make it perfectly safe for indoor installations and populated areas.
• High Mechanical & Electrical Strength
The casting and impregnation processes create windings with high resistance to short-circuit forces. The use of full-width copper foil for low-voltage windings ensures uniform ampere-turn distribution, minimizing mechanical stress and enhancing short-circuit withstand capability.
• Intelligent Temperature Management
Equipped with a reliable temperature control and display system (TD). It provides continuous monitoring with alarm functions for over-temperature conditions and can automatically activate forced-air cooling (AF) or trip the high-voltage supply in case of a critical fault, ensuring operational safety.
• Robust Core & Efficient Cooling
The core is constructed from high-grade, grain-oriented cold-rolled silicon steel with a 45° fully staggered joint design for low losses and low noise. Axial cooling ducts within the windings and optional fan cooling (AF) ensure excellent thermal performance.
Specifications & Parameters
| Category | Specification / Description |
| Model Series | SG(B)9-11 (Epoxy Cast Resin), SC(B)9-11 (Nomex® Insulation) |
| Rated Capacity | Three-Phase: 30 kVA to 8000 kVA |
| Voltage Class | Up to 38.5 kV and below (All standard levels) |
| Frequency | 50 Hz or 60 Hz |
| Tap Changer | Off-Circuit Tap Changer (OCTC) or On-Load Tap Changer (OLTC) |
| Tap Range | ±5%, ±2x2.5%, or as requested |
| Vector Group | Dyn11, Yyn0 (and others as required) |
| Insulation Class | Class F (155°C) or Class H (180°C) |
| Cooling Method | AN (Air Natural) or AF (Air Forced) |
| Protection Level | (IP) IP00, IP20, IP23 (Standard) |
| Impedance Voltage | Standard value or as per customer requirement |
| Dielectric Strength | 10kV: AC 35kV / LI 75kV 20kV: AC 50kV / LI 125kV 35kV: AC 70kV / LI 170kV |
| Applicable Standards | GB1094.11-2007, GB/T10228-2008, IEC 60076 |
Packaging, Warranty & Certifications Packaging：
The transformer is securely mounted on a sturdy base frame. For protection, the unit is wrapped with waterproof material and placed in a robust wooden crate or enclosed within a steel frame structure. Bushings, temperature controllers, and other accessories are individually packed.
Warranty：
We offer a comprehensive standard 12-month warranty from the date of commissioning or 18 months from the date of shipment, whichever occurs first. The warranty covers defects in materials and workmanship under normal operating conditions as defined in the manual.
Certifications & Testing：
Our manufacturing quality system is certified. Every transformer undergoes a full suite of routine tests in our in-house testing facility, including turns ratio, winding resistance, impedance voltage, no-load and load loss measurements, and dielectric withstand tests (power frequency and impulse). We have the capability to perform all type and special tests as per standards. Products are designed and produced in compliance with GB and IEC standards.
Environmental Compliance：
The dry-type, oil-free design inherently supports green building initiatives and complies with environmental regulations for indoor installation without secondary containment.
