When people ask us about transformer capacity, we often forget the exact formula for calculating transformer capacity. So, what is the correct way to calculate it? Let's take a closer look at the process. 1. Transformer Capacity Calculation Formula The first step in calculating transformer capacity is to determine the maximum power required by each phase of the load. This involves adding up the power of each individual phase (A, B, and C). For example, if phase A has a total load of 10 kW, phase B has 9 kW, and phase C has 11 kW, the maximum value among them is 11 kW. It's important to note that for single-phase devices, you should use the maximum power rating listed on the nameplate. For three-phase equipment, divide the total power by 3 to get the per-phase power. For instance: Total power of phase C = (Computer 300W × 10 units) + (Air Conditioner 2kW × 4 units) = 11 kW. 2. Calculate the Three-Phase Total Power Once you have the maximum per-phase power, multiply it by 3 to get the total three-phase power. In our example, that would be 11 kW × 3 = 33 kW. However, this is just the active power. To account for the power factor, which is typically around 0.8 for most transformers on the market, you need to divide the total power by 0.8. 33 kW ÷ 0.8 = 41.25 kW. Next, according to the "Electric Engineering Design Manual," the transformer’s capacity should be selected based on the calculated load. For a single transformer with a steady load, it is recommended to operate at approximately 85% of its rated capacity. So, 41.25 kW ÷ 0.85 = 48.529 kW. Therefore, you should choose a transformer with a capacity of at least 50 kVA. Second, Some Common Questions About Transformer Capacity 1. The rated capacity of a transformer refers to the apparent power it can supply without exceeding safe operating conditions. 2. This apparent power represents the output of the transformer when it's under the highest load. 3. When a transformer operates at its rated capacity, the output power matches its rated capacity. 4. The input power to the transformer during rated operation is usually higher than the rated capacity. 5. Due to the high efficiency of transformers, it is commonly assumed that the input apparent power equals the rated capacity, and this assumption is generally accurate for most applications. 6. When using a transformer, it is sufficient to monitor the output current, voltage, and power factor. As long as the apparent power does not exceed the rated capacity, it is considered safe. 7. Some people mistakenly believe that transformers must be operated below 90% of their rated capacity due to losses. This is not accurate. 8. When designing the transformer’s capacity, it is essential to include a safety factor based on the calculated load. These are some common points related to the transformer capacity calculation formula and the overall process. I hope this guide helps you better understand how to calculate transformer capacity and make informed decisions. What, the decoration still uses your own money? ! The Qi family offers installment payments with an ultra-low annual interest rate of 3.55% and a maximum loan of 1 million. Apply now and enjoy the discount. If you're interested in brand cooperation, content collaboration, or advertising opportunities on this site, please send an email to: [email protected] Electronic transformer | Power transformer | Three-phase dry-type transformer | Transformer brand
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