The main difference between no-load operation and load operation of transformer is mainly reflected in secondary coils.

In no-load operation of transformer, although the secondary side has no power output, the primary side still draws part of the active power from the power grid to compensate for the hysteresis loss and eddy current loss in the core caused by flux saturation. The magnitude of hysteresis loss depends on the frequency of power supply and the area of hysteresis loop of iron core material; eddy current loss is proportional to the square of maximum flux density and frequency. In addition, there is copper loss caused by no-load current. For transformers with different capacities, the magnitude of no-load current and loss is different.

The load operation of transformer refers to the working condition when the original winding is connected to the power supply voltage and the secondary winding rents the load. At this time, the secondary side of the transformer also has current flow, the access circuit of the original transformer increases correspondingly compared with the no-load, and the voltage of the secondary side will be affected by the load and change.

power transformer

The transformer uses the principle of electromagnetic induction to change the AC voltage. Its main components are primary coil, secondary coil and core. In electrical equipment and radio circuit, it is often used for up-and-down voltage, matching impedance, safety isolation, etc. When transformer runs without load, it only consumes no-load loss, i.e. iron loss and stray, which is 6% of the total capacity. When transformer runs under load, it consumes no-load loss + load loss, i.e. copper loss, which is the total consumption of transformer.

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