Simulation test method for vibration monitoring research on winding looseness of power transformer

Affected by various shortness shocks, the windings of transformer is loosening and deforming. As a result, power transformers´ ability is decreased to withstand short circuit current and a big run accident is planted. Therefore, it is of great importance to conduct the research on the simulation test of winding especially wingding looseness of the power transformer. A method for power transformer winding simulation test is proposed in this paper based on the research on the vibration characteristics of transformer windings, which aims to carry out the test of vibration characteristics of transformer windings looseness in a limited test case that the power capacity is not enough. On the one hand, the test has verified the theoretical study of characteristics. On the other hand, new vibration characteristics have been found through the test. Technical achievements are as follows. 1) The method put up with in this paper can monitor the fault of the windings accurately under the circumstance that the power capacity is limited. The test operation is simple and it is easy to operate and measure the parameters. This method is useful universally for the same type of transformers. 2) It can reduce the demand for power. The operation is safe and economic. It is easy to carry out the operation. 3) The voltage of the high and low sides is so low that the influences are reduced brought by the vibration of core. As a result, it can improve the accuracy of the test. 4) Some vibration characteristics of transformer windings are found. We find that the linear relationship between some vibration signals and the square of current still persists during the process that the vibration signals pass to the tank surface and the changes of the 100Hz feature amplitude of different measuring points are different with the current changing.