Product Features of Power Transformer Recycling
Iron cores are made from cold-rolled, grain-oriented, low-loss, high-magnet permeability silicon steel sheets, with 45° fully slanting joint stepped stacking to ensure low loss and noise requirements. The surface of the cores is coated with anti-rust paint to prevent dampness and rust.
2. The high-voltage coil employs a stranded or a continuous inner-screen configuration, and a reinforced section is set at the initial end to enhance voltage distribution and ensure the insulation strength of the high-voltage coil under various overvoltage conditions. The medium and low-voltage coil structure is continuous or spiral, utilizing semi-hard copper winding. During winding, the coil is brought close to tighten the line pressure around the circumference, enhancing the ability to withstand radial forces. Both high and low-voltage coils internally employ guiding cooling to ensure coil heat dissipation. The safety distribution design is rational, aiming to minimize leakage flux and improve the coil's short-circuit resistance.
3. The leads are connected using cold-pressed technology to ensure reliable connections and clean assembly of the casing. The coil's output lines are protected with reinforced insulation and shaped insulating parts. The casing's drying is achieved through a transformer method vacuum drying, guaranteeing insulation strength and reducing partial discharge.
4. The fuel tank is designed to prevent cross-joints and other welds, utilizing advanced automatic submerged arc welding and gas shielded welding techniques to ensure no oil leakage from the welds. Ultrasonic flaw detection is employed for weld inspection.
5. The oil storage tank is equipped with a capsule seal or a fully sealed metal corrugated structure, isolating the transformer's internal oil from external air completely. This effectively prevents the entry of oxygen and moisture, thus safeguarding the insulation performance level.
6. The transformer body features a robust structure throughout, ensuring that it remains stable during transportation and under load. The assembly process employs vacuum oiling technology to reduce moisture inside the transformer, while also expelling internal gas and bubbles at the "air angle," allowing the oil to permeate the insulation. All components of the transformer are sourced from renowned domestic industry leaders, guaranteeing the overall performance and reliability of the transformer.
Transformer assembly and maintenance are the primary causes of multiple grounding in the iron core. Therefore, it is crucial to properly stack the silicon steel sheets during maintenance, and avoid damaging the insulation between the sheets when cutting. Keep the sheets clean, ensuring no metal powder remains on the disks. Flatten any protruding silicon steel sheets with a wooden hammer, paint over magnetic leakage areas, and replace any damaged washers and insulating rings. Secure loose components. The grounding plates and iron core must be firmly connected without touching other silicon steel sheets. If contact with the iron core is detected, install and secure insulating boards. After cleaning the bottom of the oil tank and drying the transformer's insulation, conduct electrical testing and observation on the repaired transformer. Confirm that the sound is normal, all components are well-connected, and there are no protrusions before placing it back in the oil tank.
