Possibility of increasing the switching resource of liquid-metal self-regulating fuses with fusion insert

THE PURPOSE. Assessment of the state of the art in the development of current limiters based on liquid metal self-healing fuses and an increase in the switching life of self-healing fuses with a composite fuse-link.METHODS. When solving the problem, the method of literature analysis was used, as well as the method for calculating dependencies for different materials of the fuse-link, the implemented method of scientific computer mathematics.RESULTS. Literary sources contain information about the designs of liquid-metal self-healing fuses and their research, allowing conclusions to be drawn about their viability and the possibility of obtaining a practical yield. A common disadvantage of the of liquid-metal self-healing fuses design is a limited switching resource due to an increase in the diameter of the fuse-link under the action of arc erosion. A significant effect of increasing the switching resource and the stability of the protective characteristic is possessed by the design of a of liquid-metal self-healing fuses with a composite fusible link. However, in such designs, the switching capacity is reduced. It is shown that the main criterion for the operability of the liquid-metal self-healing fuses with a composite fusible link is the value of the ratio between the value of the shunting resistance and the resistance of the electric ARC. The performance of the liquid-metal self-healing fuses with a composite fusible link is ensured at values of this value below critical.CONCLUSION. The proposed mathematical expression may turn out to be useful in the development of liquid-metal self-healing fuses with a composite fusible link design, for example, when choosing an electrode material, liquid metal, etc. This will significantly increase the switching resource of the liquid-metal self-healing fuses with a composite fusible link. The condition must be taken into account in the parametric synthesis of the current limiter based on the liquid-metal self-healing fuses with a composite fusible link.

CONTROL OF SPATIAL PROTECTION IN KAUMAN SEMARANG

Locality and cultural identity aspects are very important to create humane cities in the midst of globalizing world. Kauman Semarang is the city’s cultural identity which has lasted for more than three centuries. Traditionally, Kauman is a village in downtown which reflects Moslem daily live. The physical and social characteristicschange are the reaction of modernization-capitalization pressure of the downtown. The purpose of the research is to find out how Kauman adapts to the incoming pressures. The research was based on ethnographic method by combining ideographic and architectural approaches. In the end of the research, it found that there is a spatial control having protective characteristic or a control of spatial protection conducted by the community. Socioreligious values have influenced in strengthening socio-religious space that produces immaterial products associated with the community’s mentality. Meanwhile, the modernization-capitalization pressures influence the form of significantly developed business-commercial space, and their products are eventually used to support the socio-religious activities. Spatial protection strategy is an answer for the problem of modernization-capitalization pressures in downtown. This finding could be a useful input for the preservation efforts at Kauman Semarang particularly and for cities having similar problems generally.