As the core equipment for power transmission and distribution, the scientific selection of transformers directly determines the stability, economy, and safety of the power system. Many people only focus on power and price when selecting transformers, which can easily lead to issues such as overload burnout and resource waste. In fact, by grasping the core logic, one can accurately select suitable equipment. The following are key selection points.
Accurate load calculation and capacity determination are fundamental. Choosing a small capacity can easily lead to overload, while a large capacity results in high no-load losses. The core is to calculate the load rather than simply adding up equipment power.
Align core parameters to establish a solid safety baseline. The voltage level must fully align with the power grid and electrical equipment, with the primary side corresponding to the grid voltage and the secondary side adapting to the equipment voltage. In scenarios with significant voltage fluctuations, a voltage-regulating transformer can be chosen. The connection group should preferably be Dyn11, which is suitable for scenarios with unbalanced three-phase loads. The impedance voltage must align with the grid parameters. The domestic grid frequency is fixed at 50Hz, and incorrect selection is strictly prohibited.