When people ask us about transformer capacity, we always forget the formula for transformer capacity calculation. What is the transformer capacity calculation formula? Let's take a look at it next.

First, the transformer capacity formula

1. Calculate the power of each phase of the load

We add the three-phase load power of phase A, phase B, and phase C independently. If the total power of phase A load is 11KW, the total power of phase B load is 10KW, and the total power of phase C load is 9KW, then we take a large value of 11KW. (Note: The power of each device of a single phase is calculated according to the large value above the nameplate. The power of the three-phase device is divided by 3, which is equal to the power of each phase of this device.)

2, calculate the total power of three phases

11KWX3=33KW (Transformer three-phase total power)

Three-phase total power / 0.8, pay attention to this is an important step. Because most of the transformer power factor that we currently sell on the market is only 0.8, we need to divide by 0.8 here.

33KW / 0.8 = 41.25KW (total transformer power)

The total transformer power / 0.85, according to the "Electrical Engineering Design Handbook", the transformer capacity calculation should be based on the calculation of load selection, for a single transformer power supply with a smooth load, the load rate is generally taken about 85%.

41.25KW / 0.85 = 48.529KW (need to buy the transformer power), then choose a 50KVA transformer at the time of purchase.

Second, some questions about transformer capacity calculation

1. The rated capacity of the transformer shall be the large apparent power of the transformer under the specified conditions of use to ensure the normal operation of the transformer;

2. The so-called apparent power is the output power of the transformer, which is also the apparent power of the transformer with a large load;

3. When the transformer is rated for operation, the apparent power of the transformer is equal to the rated capacity;

4. When the transformer is rated for operation, the apparent input power of the transformer is greater than the rated capacity;

5, due to the high efficiency of the transformer, it is generally believed that when the transformer is rated for operation, the input power of the transformer is equal to the rated capacity, and the calculations and results thus performed are also basically accurate;

6, so when using the transformer, as long as you observe the transformer output current, voltage, power factor and apparent power is equal to or less than the rated capacity is safe (when the conditions of use are satisfied);

7. Some people think that the transformer is depleted and must operate below the rated capacity of 90%. This view is wrong!

8. When the transformer is designed for capacity, it is correct to multiply the calculated load by the safety factor.

The above is a small problem in the transformer capacity calculation formula and transformer capacity calculation that I introduced for everyone. Hope that the above introduction can give you some small references.

Shelters & Canopy

shelters camping tent,shelters tarp tent,tent shelter canopy,tent shelters type

Ningbo Tuofeng Outdoor Products Co., Ltd. , https://www.tuofengoutdoor.com