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The company has complete production and supporting facilities, including raw material pretreatment area, coil manufacturing area, vacuum casting area, curing and maintenance area and quality inspection center. With these advanced production facilities, the company's annual production capacity reaches 2 million kVA.
The core has a miter step-lap joint to ensure stable performance and reduced sound level. The steel is cut in a sequential way and automatically stacked, ensuring dimensional accuracy and single sheet interlacing within the full stack.
The high-voltage winding adopts a sectional layer insulation structure. It is cast under vacuum with epoxy resin and designed to meet Class H insulation requirements. Transient analysis has been conducted to evaluate the electrical stress distribution across the windings, supporting the validation of the design's voltage withstand capability.
The low-voltage windings are manufactured using copper foil and specially selected insulating materials. After the winding is formed, the coil is cured in an oven, resulting in a structure with proven capability to endure short-circuit conditions.
The encapsulation process is a critical operation in the manufacturing procedure and must be strictly controlled to ensure optimal insulation and mechanical properties. First, the windings are placed in a preheating oven until they reach the specified casting temperature. Meanwhile, the resin mixture is prepared using a continuous mixing system. The resin components should be mixed just before the encapsulation process begins to ensure proper reactivity and viscosity. Once the coils are preheated, they are transferred to the vacuum casting chamber. When the vacuum level reaches the required value, the resin mixture is poured into the molds. At this stage, the low viscosity of the freshly mixed resin enables it to thoroughly penetrate the gaps between the windings, which helps achieve a low level of partial discharges. After casting is complete, the molded coils are placed in a curing oven, where the resin gels and fully cures, developing its final electrical and mechanical properties.
Our quality control system monitors the production process in real time to ensure that the parts meet rigorous quality standards. DETONG has its own technical testing room equipped with advanced testing equipment and has an experienced team of quality control engineers to ensure the quality and on-time completion rate of the products.
High-voltage winding is a critical part of a cast resin transformer, where high manufacturing quality drives the difference.
Detong Power Technology assures the total reliability of its product through the use of demanding manufacturing control. High-voltage coils undergo a repetitive impulse test after winding and before casting to verify the absence of dielectric defects. Once the coil passes this test, it is encapsulated under vacuum. After encapsulation, the partial discharge level is measured to confirm the absence of bubbles or gaps, thereby demonstrating the long-term reliability of the high-voltage insulation system.
Every transformer undergoes a detailed individual test and inspection, including all routine tests according to national standards as follows:
(1) Measurement of winding resistance
(2) Measurement of voltage ratio and testing of vector group
(3) Load loss and short-circuit impedance measurement
(4) No load loss and no load current measurement
(5) Separate source voltage withstand test
(6) Induced overvoltage withstand test
(7) Partial discharges measurement
We strictly adhere to industry standards and comply with local product regulations to demonstrate our commitment to quality, safety and environmental responsibility. The relevant certifications we have obtained not only demonstrate our commitment to the high standards of the transformer industry, but also bring confidence and assurance to our customers who work with us.
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