Translated Abstract
Transformer is an integral part of the power grid. Since the transformer is a long-running device. Therefore, the loss and vibration noise of its research is particularly important. Through analysis we know that transformer loss and vibration noise are closely related to the core. In this paper, Through experimental study on the key factors affecting the core loss and vibration noise. Find some method which not only reduce loss and vibration noise but also without affecting the transformer normal operation.
First, Study the sources of the transformer core loss. According to the results,we find the way to reduce the core loss. Introduce a common method to testing the unit iron loss of silicon steel, And validated in experiments. Experimental analysis the influence of the unit iron loss by temperature, pressure, frequency. The results show that: When the temperature is below 120℃, with the increase of temperature the unit loss decreased gradually; When the temperature is higher than 120℃, with the increase of temperature the unit loss increases sharply. When the pressure is less than 0.09Mpa, with the increase of the pressure the unit loss decreased gradually; When the pressure is higher than 0.09Mpa, with the increase of pressure the unit loss increases slowly. When the frequency increases, the unit iron loss increases sharply. This paper analyzes the causes of these factors lead to changes in silicon steel unit iron loss. Provides a reference for transformer design. Concluded empirical formulas with parameters of the unit loss.
Secondly, analysis of the factors affecting the core additional loss. To find ways to reduce the additional loss. Analysis the different insulation thickness to the influence of the transformer additional loss. Different wide affects for additional loss. The number of slots affects for additional loss. The results show that: With the increase of insulation thickness, additional loss will increase; With the increase of width, additional loss will also increase; With the increase of number of slots, the additional loss of transformer will decrease. Analysis of the process coefficient which production core. And proposed ways to reduce the process coefficient.
Finally, Discuss the substance of the core vibrations noise. And simulation analysis of the position which is the largest of transformer core vibration. Proposed specific measures to reduce vibration and noise. Analysis of transformer noise spectrum, get reasons for the increased noise. And experimental analysis of the changes of core vibration and noise at different magnetic flux density . Then experimental analysis of the changes of core vibration and noise at different pressure. The results show that: The transformer maximum position of vibration and noise are in the four corners. To reduce the magnetic flux density is good for reducing vibration and noise. But too small flux will result in a waste of material. It is generally a choice between 1.5T and 1.6T. Increasing the pressure is good for reducing noise and vibration. To ensure that the pressure on the silicon around 0.1Mpa.
Corresponding authors email
