What is the mystery of no-load voltage and load voltage of type R transformer?
Before introducing the difference between no-load voltage and load voltage of type R transformer, let’s briefly understand the working principle of transformer. The working principle of a transformer is actually very simple. You can compare the primary and secondary windings of a transformer to two inductors. When an AC voltage is added to the main winding, an electric potential is formed on the main winding, creating an alternating magnetic field. When the secondary winding resistance is affected by the primary winding resistance, it will also produce the same induced voltage as the primary winding resistance magnetic field, so the secondary winding resistance outputs the AC voltage, which is the whole transformer transformer process.
Let’s talk about the difference between the no-load voltage and the load voltage of the transformer. Literally, the no-load voltage is not the voltage of the connected device, and the load voltage is the voltage of the connected device, so what is their mode of operation? First, when the transformer is running no-load, although the secondary side has no power output, the primary side still absorbs part of the power from the grid to compensate for the flux saturation. Hysteresis loss and eddy current loss are usually caused by the iron core, and the size of the general hysteresis loss depends on the frequency of the power supply, the core material and the area of the hysteresis loop. Eddy current loss is proportional to the square of the maximum magnetic flux density and frequency. Copper consumption is sometimes caused by no-load current. Compared with transformers of different capacities, no-load current and no-load loss are also different.
The load operation of the transformer usually refers to the working state of the primary winding resistance of the transformer after the power supply voltage is connected. At this time, the auxiliary edge of the transformer has a current cycle, and the original access circuit is increased compared to the no-load. In this case, the auxiliary edge voltage will be affected by the load. When the transformer is running at normal load, there are also some precautions: the transformer can run at rated current all year round under rated conditions of use; When the transformer has serious defects or insulation weaknesses, try not to exceed the rated current;
The main difference between transformer no-load voltage and load voltage is that in the transformer secondary coil, when the transformer load is running, the secondary coil is connected to the load, producing more power. When the transformer is in no-load operation, the secondary coil has no access equipment, and the power is small, which is the difference between them.