How many kW of power consumption can a 1000kVA transformer handle?

2025,04,23

"There is an old transformer with a capacity of 1000kVA. The current load is about 200kW. If a new load of about 600kW is to be added, can this transformer withstand it?"

This question first involves a concept, that is, the relationship and difference between kVA and kW.

kVA (kilovolt-ampere) is the unit of apparent power, and kW (kilowatt) is the unit of active power. In addition to apparent power and active power, there is also reactive power, and the unit of reactive power is kvar (kilovar).

So what is the difference between active power, reactive power, and apparent power?

Active power is the power actually consumed by electrical appliances, that is, electrical energy converted into other forms of energy.

For example, the electricity bills that everyone pays on a daily basis are the active power;

Reactive power refers to the part of power that some equipment does not actually consume electricity, it just temporarily stores electricity. For example, if there is a capacitor/coil in a certain electrical equipment, then when this equipment is working, the capacitor/coil will always be in a charging and discharging state. Because the capacitor/coil is always charging and discharging, and does not really consume electricity, this part of power is called reactive power.

Apparent power refers to the total power provided by the power supply.

In addition to providing active power to the electrical equipment, the power supply (generally refers to the transformer or generator) also needs to provide reactive power. The reason is very simple. Although the capacitor in the electrical equipment does not consume power, it is always charging and discharging, so it also needs to occupy a part of the power supply capacity.

After clarifying these, let's look at the relationship between them, which requires another concept---power factor. How much active power a power supply can provide depends on the power factor.

[Power Factor]

The power factor refers to the ratio of active power to apparent power, generally expressed as cosφ. For example, a 1000kVA transformer can output 600kW of active power when the power factor cosφ=0.6; but when the power factor cosφ=0.9, it can output 900kW of active power.

If 1 kWh is 1 yuan, when the power factor is 0.6, the transformer can generate an economic benefit of 600 yuan per hour; when the power factor reaches 0.9, the transformer can generate an economic benefit of 900 yuan per hour. In fact, the role of improving the power factor is far more than that, there are many more, I will not go into details here.

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Author:

Mr. jiawenhan

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JT13797437282@gmail.com

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+86 13797437282