Thermal Analysis of the Fuse with Unequal Fuse Links Using Finite Element Method
In this paper a three dimensional thermal model of high breaking capacity fuse with unequal fuse links is proposed for both steady-state or transient conditions. The influence of ambient temperature and electric current on the temperature distribution inside the fuse, has been investigated. A thermal analysis of the unbalanced distribution of the electric current through the fuse elements and their influence on fuse link temperature rise, has been performed. To validate the three dimensional thermal model, some experimental tests have been done. There is a good correlation between experimental and simulation results. Keywords—Electric fuse, fuse links, temperature distribution, thermal analysis.
Design And Development Of An Automatic Single Phase Protective Device Using Ssr
Since the discovery of energy, safety has been a paramount subject matter. This, we can see in today's electrical systems where protective devices such as fuse and circuit breakers are used to prevent fire hazards resulting from overload, overvoltage and short circuits. However, with all the revolution in technology, these options may be considered less smart since the fuse, made with wire strands calculated for specific current capacity faults permanently when the specified current rating is exceeded. While the circuit breaker which is made up of mechanical switch fails as a result of carbon forming and the wearing away of the contacts because of arcing. As a means of improvement, this paper presents the design and development of an automatic single phase protective device using solid state relay (SSR). This study is to ensure automatic cut off from power supply in cases of overvoltage (above 240 V AC) or when overload and short circuit (current above 8amps) is detected without permanent damage of a fuse placed along current path. Also the design will ensure that there is an automatic close circuit whenever the trigger switch is (momentary switch) is closed. The system is achieved via the use of PIC micro-controller, current sensor and other discrete components. The system is tested and works well inhibiting the frequent faulting of fuses. It also helps to prevent hazard as a result of overvoltage, overload and short circuit and ensures a close circuit when the trigger switch is closed.
Design and verification of a simulation model for fuses with high-breaking capacity
This paper presents a new simulation model for fuses with high-breaking capacity. Especially when investigating protection concepts for high-power converters, fuse behavior is of major interest. Design basics and applications of modern fuses will be presented, followed by a detailed description of the modeling concept. The realization in a commercial simulation program is then discussed, accompanied by measurement results used for parameterization. Additional measurements are employed to verify and assess the accuracy of the model. Finally, the application of the model in complex drive systems is shown.