(1) Calculation of Transformer Capacity First, select the rated voltage of the transformer. The high-voltage side voltage is the same as the grid connection voltage, and the low-voltage side voltage is 10% or 5% higher than the low-voltage side (depending on the transformer voltage level and impedance voltage); Selection of rated capacity. Calculate the magnitude of the load carried by the transformer (it is necessary to calculate the maximum comprehensive load and convert the kW value of the active load into the apparent power kVA). If there are two transformers, the capacity of each transformer can be selected based on 70% of the maximum comprehensive load, and one transformer can be considered based on the total load, while also considering appropriate margins. Other brand parameters can be considered in conjunction with transformer products. A good transformer has a large load-bearing capacity and a wide range of applications, making it undoubtedly the preferred choice for transformers. Example: Select a 35/10kV transformer. Assuming a maximum load of 3500kW and a power factor of 0.8. Two sets with a capacity of S=0.7 can be selected × A transformer with a voltage ratio of 35kV/10.5kV can be selected for a 3500/0.8=3062kVA transformer. Then select the model from the product catalog. (2) Transformer capacity calculation formula: 1) Calculate the maximum power of each phase of the load Add the load power of phase A, phase B, and phase C separately. If the total load power of phase A is 10kW, the total load power of phase B is 9kW, and the total load power of phase C is 11kW. Take the maximum value as 11kW. (Note: The power of single-phase equipment is calculated based on the maximum value on the nameplate. The power of three-phase equipment divided by 3 is equal to the power of each phase of the equipment.) 2) Calculate the total power of the transformer 11kW × 3-phase=33kW (total three-phase power of transformer) 3) Calculate the total power of the transformer The three-phase total power is 0.8, which is the most important step. Currently, more than 90% of the transformers sold in the market have a power factor of only 0.8, so it needs to be divided by a power factor of 0.8. Total power=33kW/0.8=41.25kW 4) Calculate the total capacity of the transformer The total power of the transformer is 0.85. According to the "Power Engineering Design Manual", the capacity of the transformer should be selected based on the calculated load. For a single transformer with stable load power supply, its load rate is generally around 85%. 41.25 kW/0.85=48.529kW (transformer power to be purchased), a 50kVA transformer can be selected when purchasing.
Single Phase Control Transformer, Single Phase Isolation Transformer,Three Phase Isolation Transformer, Electrostatic Precipitator Transformer, Pole Mounted Transformers,Electric Furnace Transformer,Conservator Type Transformer
