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Our Dry Transformer Core products boast superior performance characteristics, including low loss, low noise, low no-load current, high mechanical strength, strong short-circuit withstand capability, minimal partial discharge, excellent insulation properties, superior thermal stability, precise dimensions, minimal burrs, optimal process coefficients, and an aesthetically pleasing appearance. We offer a comprehensive range of iron core solutions covering voltage levels from 10kV to 1100kV.
◇ We maintain long-term, stable, and direct supply relationships with major global steel mills to fully guarantee the quality of the silicon steel sheets—the primary material—used in our iron cores.
◇ Our silicon steel sheets are processed using internationally advanced, fully automated, and intelligent production lines. This ensures high processing precision, minimal burrs, excellent flatness, and high efficiency, while also significantly shortening delivery lead times.
◇ Our entire manufacturing process is conducted without the use of overhead cranes; instead, we utilize intelligent workshops featuring constant temperature, humidity, and dust-free environments. From raw materials to the finished iron core, the entire workflow is designed to minimize additional stress on the silicon steel, thereby reducing the iron core's manufacturing process coefficient and effectively guaranteeing product performance and quality.
◇ By employing a unique, full-sequence stacking method—combined with advanced processes and equipment—our products demonstrate significant advantages in terms of energy conservation and environmental protection.
◇ The clamping components are fabricated from high-strength steel and precision-formed using CNC bending technology. Compared to traditional channel steel structures, these components offer superior mechanical strength, more precise dimensions and positioning, and a sleek, aesthetically pleasing profile.
◇ The core insulation utilizes PET (Class F) insulating material, ensuring that the transformer remains free from phenomena such as electrical discharge, leakage, or dielectric breakdown.
◇ It employs the independently developed PTTX002 fastening adhesive, which is safe, environmentally friendly, and odorless.
By Insulation & Cooling Medium – Coating Compatibility, to define transformer cores
Oil‑Immersed
Most common for power and distribution. GO requires insulation coatings resistant to hot transformer oil (thermal stability up to 120°C+), high interlaminar resistance, and hydrolysis resistance.
Dry‑Type
Air‑cooled, used indoors or in fire‑sensitive areas. Coatings must withstand higher temperatures (class F/H insulation) and, for open environments, enhanced corrosion protection. Low‑loss GO maintains efficiency without liquid cooling.
Common Coating Need
Both benefit from insulation coatings that preserve low core loss after stress‑relief annealing.
By Voltage Class – Core Size & Magnetic Flux Density, to classify cores of transformer
· Low Voltage (LV): Up to 1 kV
· Medium Voltage (MV): 1 kV – 69 kV
· High Voltage (HV): 69 kV – 230 kV
· Extra High Voltage (EHV): >230 kV
Large cores require careful control of magnetostriction and joint losses. Domain‑refined GO is often used to reduce no‑load loss, a major part of lifecycle cost.
By Cooling Method – Thermal Management, for classification of transformer cores
Cooling method (ONAN, ONAF, OFAF, etc.) does not change core material but affects temperature rise. High‑cooling designs allow higher flux density since heat is removed more effectively. GO with stable magnetic properties up to 100–120°C ensures performance across all cooling regimes.
