https://www.transformer-tester.com/transformer-tester/transformer-winding-deformation-tester/sweep-frequency-response-analysis-transformer.htmlTransformer winding deformation test is a test method that has been widely used in power systems in recent years to detect whether it is deformed. It can effectively find changes in the axial and radial dimensions of the transformer, body displacement, winding distortion, bulging, and inter-turn short circuits. Power transformer is one of the most important equipment in the power system, which is directly related to the safe operation of the power grid. Accidents caused by transformer winding deformation account for more than 1/4 of transformer accidents. Therefore, the transformer winding deformation test is listed as a required test item after the transformer delivery, handover and short-circuit accidents by the State Grid.
According to the requirements of transformer winding deformation test, we have developed and manufactured a professional instrument designed to detect whether the transformer winding deformation occurs-transformer winding deformation tester.
The energized conductor will be subjected to electromotive force in the magnetic field. The winding of a certain phase of the transformer is also in the magnetic field formed by the other two phases, and will also be subjected to electromotive force. When the normal load current passes through the winding, this electromotive force It is very small and will not cause harm to the windings, but when a short-circuit accident occurs, especially when the short-circuit point is very close to the secondary outlet of the transformer, the short-circuit current will be very large, and the strong electric power will cause the transformer winding to vibrate violently and even deform;
Since the transformer is a fully enclosed electrical device, it is difficult to see the internal deformation from the appearance. People came up with a method to understand the deformation of the winding through an external test. This method is called "the frequency response characteristic test of the winding". ". The most basic principle of the winding deformation test is to treat the transformer winding as an inductance coil. Any change in the shape of the winding will cause a change in the inductance and thus a change in the frequency curve. It is to add a given frequency on one side of the transformer and receive its frequency on the other side. Check whether there is a big difference between the received frequency curve and the added frequency curve, and the frequency curve recorded at the time of delivery or new operation If the difference is small, it means that the winding is basically not deformed. If the difference between the two is large, it means that the winding may have a large deformation, and the lifting core (cover) should be overhauled.
With the development of society, it is believed that the transformer winding deformation test will become easier and more accurate in the future. And the function of transformer winding deformation tester will become more and more powerful.
