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- Title
THE IMPACT OF ADDITIONAL LOSSES IN AMORPHOUS TRANSFORMER CORES ON VIBRATIONS - IN THE CONTEXT OF PROTECTION AND CONSERVATION OF EXHIBITS AND HISTORICAL OBJECTS.
- Authors
NABIAŁEK, Marcin; JEŻ, Bartłomiej
- Abstract
Modern materials are increasingly used, directly or indirectly, in the protection of monuments. Electrical equipment is used in all laboratories, where monuments are subjected to conservation or restoration. Transformers are included in most of these electrical devices; and, in museums and laboratories, there are also distribution transformers. In these transformers, idling losses (also known as 'transformer core losses'), play a major role in relation to significant changes in load. Materials in which magnetostriction occurs are commonly used to manufacture transformer cores. During the magnetization of the magnetic core of the transformer, there is a change in its dimensions, resulting in the formation of mechanical waves; these waves propagate, both in the air (giving the characteristic sound of a transformer in operation - with significant intensity for large installations), and also in the building structure - through fixtures installed in the ground and walls. High magnetostriction of the core material also creates significant releases of heat - which should be removed, so as not to damage the stored exhibits. Electrical devices usually work at low frequencies of 50 Hz - which causes the formation of waves of considerable wavelengths in the building structure. The suppression of these waves is problematic, and even at low amplitudes, in the long-term such waves can cause plastic deformation or fatigue of the materials from which exhibits are made, hence resulting in their gradual degeneration. Using a carefully selected chemical composition and an amorphous structure, material properties can be modeled in such a way as to obtain a material with almost zero magnetostriction. In addition, changes in chemical composition can lead to the reduction of losses on remagnetization; i.e. the reduction of energy consumption and the associated release of adverse heat. One of the components of losses due to magnetization is that of 'additional losses'. As part of this work, amorphous samples of two alloys, Fe60Co10Y8Ni2B20 and Fe60Co10Y7Ni3B20, were produced using injection casting method. Dynamic performance tests were carried out on the manufactured materials using a Ferrometer. Based on the loss measurements, additional losses were determined in relation to the maximum induction. The relationship between the percentage share of additional losses and the maximum induction was found for both of the examined alloys.
- Subjects
DIE-casting; MATERIAL fatigue; INJECTION molding of metals; MECHANICAL properties of condensed matter; MATERIAL plasticity; MAGNETOSTRICTION; MAGNETIC cores
- Publication
International Journal of Conservation Science, 2019, Vol 10, Issue 4, p653
- ISSN
2067-533X
- Publication type
Article