Dizajn kremík uhlík tyč napájanie napájanie vybavenie

The most common control method for electric heating supply channels is to use thyristors in anti parallel to control the transformer once, and connect the transformer twice to a corresponding set of silicon carbide rods. In terms of transformer design, like other electric furnace transformers, its capacity design must leave a certain margin. The transformer used for the feeding channel is generally designed with a single-phase 380V incoming voltage, and the secondary voltage matches the resistance and power of the connected silicon carbide rod. As mentioned earlier, silicon carbide rods will age during use, and their resistance will increase, even up to four times the initial resistance during their lifespan. Therefore, the secondary voltage of the transformer must have several adjustable voltage levels, each level designed for constant power. The lowest voltage level is designed according to the initial resistance of the silicon carbide rod, while the remaining voltage levels are designed after resistance aging. The highest voltage level should be twice the lowest voltage level. In this way, after a period of time, the resistance of the silicon carbide rod increases and cannot meet the power required for heating. Therefore, the voltage is raised by one level, and the heating power can be met. And so on, ensuring the service life of the silicon carbide rod. This design is the most standardized and can be seen everywhere on the feeding channels in previous years. The secondary voltage is often designed in four levels, namely 60V, 80V, 100V, and 120V.