How to check the transformer?
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The transformer, which translates as "Converter", entered our lives and is used everywhere in everyday life and industry. That is why it is necessary to be able to check the transformer for operability and serviceability in order to prevent breakage in case of failure. After all, the transformer is not so cheap. However, not every person knows how to check the current transformer independently and often prefers to take it to the master, although this is not at all difficult.
Let us consider in more detail how you can check the transformer yourself.
How to check the transformer with a multimeter
The transformer works on a simple principle. In one of its circuits, a magnetic field is created due to alternating current, and in the second circuit, an electric current is created due to a magnetic field. This allows you to isolate the two currents inside the transformer. To test a transformer, you must:
- Find out if the transformer is damaged externally. Carefully inspect the transformer shell for dents, cracks, holes and other damage. Often the transformer deteriorates from overheating.You may see traces of melting or swelling on the body, then the transformer does not make sense to look further and it is better to have it serviced.
- Inspect the transformer windings. Must be clearly printed labels. It does not hurt to have a transformer circuit with you, where you can see how it is connected and other details. The scheme should always be present in the documents or, in extreme cases, on the developer’s web page.
- Find also the input and output of the transformer. The voltage of a winding that creates a magnetic field must be marked on it and in the documents in the diagram. It should also be noted on the second winding, where current is generated, voltage.
- Find the output filtering, where the transformation of power from variable to constant occurs. Diodes and capacitors must be connected to the secondary winding, which perform filtration. They are shown in the diagram, but not on the transformer.
- Prepare a multimeter to measure the voltage measurement in the network. If the panel cover prevents access to the network, then remove it for the time being checked. Multimeter can always be bought in the store.
- Connect the input circuit to the source.Use a multimeter in AC mode and measure the primary voltage. If the voltage drops below 80% of the expected value, then the primary winding is likely to fail. Then simply disconnect the primary winding and check the voltage. If it has risen, the winding is faulty. If it does not, the fault is in the primary input circuit.
- Also measure the output voltage. If there is filtering, the measurement is carried out in DC mode. If not, then in AC mode. If the voltage is incorrect, then it is necessary to check the entire unit in turn. If all parts are in order, then the transformer itself is faulty.
You can often hear a buzzing or hissing sound from a transformer. This means that the transformer is about to burn out and it must be immediately disconnected and returned for repair.
In addition, often the windings have different grounding potential, which affects the calculation of the voltage.
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