Transformer Capacity Calculation and Power Relationship Analysis

Transformer capacity is an important parameter in a power system that determines the performance and operational effectiveness of a transformer. The capacity of a transformer is the power capacity it can transmit, usually expressed in volt-amperes or kilovolt-amperes. When selecting the transformer capacity, several factors need to be considered, such as load demand, operating environment, and equipment cost.

First, an accurate forecast of the load demand is needed, including the size and change of the electric and reactive loads. At the same time, the operating environment, such as temperature, humidity, altitude and other factors on the performance of the transformer need to be considered. In addition, the cost of equipment is also an important factor to consider when selecting the transformer capacity, the need to ensure the safe and stable operation of the equipment on the basis of reducing equipment costs as much as possible. So how to calculate the capacity of the transformer? What is the relationship between capacity and power? Here we come together to learn.

The capacity of a transformer is expressed in terms of the apparent power unit kVA (kilovolt-amperes), which indicates the size of the output capacity of the transformer. Various loads such as electric motors and so on are expressed in active power kW (kilowatts), to illustrate the size of its output power.
The motor in operation in addition to the conversion of electrical power into mechanical power, but also need a certain amount of reactive power, so the transformer should provide both active and reactive power to the motor.
Active power refers to the conversion of electrical energy into mechanical energy, heat, light and other power, is the actual consumption of energy; and reactive power is only in the motor, the power of the motor, the power of the motor, the power of the motor, the power of the motor, the power of the motor.
The reactive power is only in the motor to form a magnetic field, so that the motor can run external work, because the principle of the motor is an energized conductor in the magnetic field by the force, but the formation of the magnetic field of this part of the power does not actually consume energy, no external work, so it is called reactive power.