How to measure the power of a transformer
How to measure the power of a transformer
An electrical transformer is a kind ofconverter of an alternating current system of one voltage by electromagnetic induction into an alternating current system of another voltage. This happens, as a rule, without significant loss of power and at a constant frequency. It consists of a transformer of several wire insulated windings, which are covered by a common magnetic flux. They are wound on a core or magnetic core made of a ferromagnetic soft material.
Instructions
1
Perhaps the surest and easiest way to measure power transformer is the sum of the power of all secondary windings. In itself, the power of the winding represents the product of the current to the voltage. For this, measure the resistance of the secondary winding, from which the power of the transformer is determined. In the event that there is no suitable ohmmeter, load on the ballast and measure the voltage drop, which is used to evaluate the resistance of the winding. Use the following formula: Rmotion = Rshunt * (Ubez shunt - Ua shunt) / Ua shunt.
2
In addition to this option, determine the powerThe transformer can also be by wire. To do this, load the secondary winding and at the same time monitor the shape of the current in the primary winding. As soon as the peaks appear, calculate the power of the secondary windings.
3
Many manufacturers of overall poweris defined as the maximum measured power in the load. In this case, the heating of the windings is measured by the contact method, while in the steady state the heating should not exceed a total of one hundred and five degrees. Usually this temperature is calculated for commercial insulating materials. A stronger heat generation is fraught.
4
And another option for measuring powertransformer. Since there are two powerful windings, then load them without a rectifier with the help of resistors at once both, while lowering the resistance until the voltage noticeably decreases, by about ten percent. Be sure to watch for warming up. If in twenty minutes of such tests the transformer does not heat up much, the load current can be increased still.
5
If the voltage is strongly "sagging," andThe transformer does not heat up, it means only one thing - the presence of a thin wire. Such a method of evaluation gives the power of the finished transformer. According to the directory, it can significantly differ from the overall power.
6
All the options considered can be used to measure the power of the transformer, but it is worthwhile to carefully approach this process from a security point of view.
