SCIENTIFIC JUSTIFICATION OF THE RELATIONSHIP BETWEEN TRANSFORMER VIBRATION ACCELERATION AND ITS REMAINING USEFUL LIFE

Abstract

From a scientific point of view, the article reveals how dangerous the mechanical vibration that occurs during the operation of oil-fired power trans-formers really is. From a scientific point of view, the article reveals how dangerous the mechanical vibration that occurs during the operation of oil-fired power trans-formers really is. Vibration is not just a "noise" or an external sign - it is considered as a source of serious degradation, which gradually corrodes the mechanical resource of the equipment, reducing its service life. The article clearly lists the causes of head vibration: dynamic impacts caused by a time–unstable electromagnet-ic field, strong electrodynamic shocks during short circuits, shifts and relaxation accumulated in the magnetic circuit and lead blocks during prolonged operation, as well as external mechanical impacts such as impacts during transportation, shaking of the ground or nearby. sources of vibration.Tatiana clearly lists the causes of head vibration: dynamic impacts caused by a time–unstable electromagnetic field, strong electrodynamic shocks during short circuits, shifts and relaxation accumu-lated in the magnetic circuit and lead blocks during prolonged operation, as well as external mechanical impacts such as impacts during transportation, shaking of the ground or nearby. sources of vibration. In the experiments, vibration acceleration was expressed through a sinusoidal model and measured with high-resolution accelerometers. Based on this, the effective acceleration value was determined, as well as the frequency spectrum. When calculating mechanical stresses, the theory of light was applied, and the highest normal and cutting stresses were found in the tube elements.Based on this, the effective acceleration value was deter-mined, as well as the frequency spectrum. When calculating mechanical stresses, the effective acceleration value was used, as well as the frequency spectrum. When calculating mechanical stresses, the theory of light was applied, and the highest normal and cutting stresses were found in the tube elements. These stresses were then linked by empirical links describing the depletion behavior, and “transformed" into the number of depletion cycles. On the other hand, the total damage was estimated using the linear loss accumulation rule, that is, the total wear effect summed up for each load contribution. On the practical side, using the example of a real transformer with a capacity of 20 MVA, calculations were performed for various levels of vibration accelerations (from light to powerful). On the practical side, using the example of a real transformer with a capacity of 20 MVA, calculations were performed for various levels of vibration accelerations (from light to powerful). The result is obvious: as the vibration on the other side increases dramatically, calculations were performed for various levels of vibration accelerations (from light to powerful) using the example of a real transformer with a capacity of 20 MVA. The result is obvious: as vibration increases, mechanical stresses increase dramatical-ly, the fatigue threshold decreases, and the service life is significantly shortened. This dependence is reliably confirmed by numerical tables and graphs. In the end, it was found that the phenomenon of vibration is one of the main factors that “eat up” the real mechanical life of the transformer. On the other hand, the proposed mathematical model and calculation method are recommended as a convenient, scientifically based diagnostic tool for real-time monitoring, preliminary assessment of the remaining service life and planning preventive repairs.