Features of special transformer for medium frequency furnace

 

 1. Energy saving, high efficiency and environmental protection. According to the requirements of the national mandatory standard "Power Transformer Energy Efficiency Limits and Energy Efficiency Grades", in the process of power grid construction, transformers have played a very important role. Power transformers are key electrical equipment for power transmission, and transformer self-consumption accounts for 30% to 40% of grid losses. On the one hand, it can effectively reduce the energy consumption and noise during operation. On the other hand, it should minimize the use of raw materials such as copper, iron, oil, and insulating parts to avoid excessive waste of resources. The power saving effect is obvi ous, and the noise is low (<65dB).

2. Anti-harmonic. The special transformer for medium frequency furnace adopts a 12-pulse transformer to eliminate the harmonics of the grid-side winding. The harmonic is a sine wave, and each harmonic has a different frequency, amplitude and phase angle. Harmonics can be divided into even-order and odd-order. The 3rd, 5th, and 7th order are odd-order harmonics, while 2, 4, 6, 8 and so on are even-order harmonics. For example, when the fundamental wave is 50Hz, 2 The sub-harmonic is 100Hz, and the third harmonic is 150Hz. Generally speaking, odd harmonics cause more harm than even harmonics. The product combines load characteristics, grid voltage fluctuations, and atmospheric overvoltage conditions, and determines a reasonable and reliable insulation level and insulation model according to the load status of the rectifier transformer to fully ensure the electrical performance of the product is reliable and stable. Product environmental safety factor ≥1.67.

3. No heat, strong overload capacity. In electrical production, in the production and materials of special transformers for medium frequency furnaces, through accurate calculation of technical parameters, high-quality, high-permeability, low-loss, high-quality silicon steel sheets are used to manufacture cores and wires, and the ratio of copper to iron is determined through scientific methods. The upper guarantee transformer has lower no-load loss and low noise performance. Through the "open source and throttling" method, the heat dissipation capacity of the transformer and the effective control of the current are increased to ensure the stable and efficient operation of the transformer. Advanced product design, strictly control the temperature rise of the heating part and heating point of the product, and leave a sufficient temperature rise margin. If necessary, add an axial oil channel in the coil, and choose the cooling method according to the coil load loss value and reasonable The oil flow is distributed to achieve the best cooling effect, and the main temperature rise indicators are at least 5°C lower than the national standard. The coil and lead adopt copper wire, and the current density is lower. The product has strong overload capability and overvoltage capability, and can operate safely for a long time under rated load conditions, and can operate safely under full load for a long time under 110% overvoltage conditions (ambient temperature 40℃); terminals connected to the transformer and the motor It can withstand 1.5 times the rated current for 5S. Product design and manufacturing fully consider the load characteristics, and meet the overload requirements in terms of temperature rise, insulation performance and accessory selection.