Abstract
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.
Highlights
С точки зрения быстродействия желательно отдать предпочтение металлам с низким удельным сопротивлением
Metal self-healing fuse without shunt resistance, 2 – with shunt resistance, 3 – with a shunt resistance and when the dielectric sleeve of the tungsten electrode is located in the narrowed part of the channel
Если за время протекания по плавкой вставке аварийного тока электрод успевает нагреваться до температуры плавления, происходит его разрушение
Summary
Где: Wпрд – преддуговой disconnection from the number of switches of интеграл ЖСП; W’прд – преддуговой интеграл ЖСП the liquid metal self-healing fuse. Where: Wпрд в первом опыте; W0 – интеграл отключения ЖСП; W’ – pre-arc integral liquid metal self-healing. 0 – интеграл отключения в первом опыте; fuse; W’прд – the pre-arc integral of the liquid. 1– включение ЖСП без шунтирующего metal self-healing fuse in the first experiment; сопротивления, 2 – с шунтирующим сопротивлением, W0 – the integral of switching off the. 3 – с шунтирующим сопротивлением и при self-healing fuse; W’0 – the trip integral in the расположении в суженной части канала first experiment; 1– switching on the liquid диэлектрической втулки вольфрамового электрода. Metal self-healing fuse without shunt resistance, 2 – with shunt resistance, 3 – with a shunt resistance and when the dielectric sleeve of the tungsten electrode is located in the narrowed part of the channel
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