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.
Thermal analysis of medium voltage fuses using the finite element method
The design of the protection system becomes fundamental to guarantee the adequate operation of the electric system under fault conditions, as it makes possible to isolate only faulted devices without affecting to the other ones. Electric fuses are protection devices broadly used in distribution networks, being designed to interrupt the current by means of the melting of one of their components when excessive currents flow through it during a period of time. In this paper the thermal analysis of a medium voltage fuse by means of the finite element method is presented. The fuse model has been designed and simulated under different conditions of ambient temperature with Cosmos software tool. The results obtained from the simulation are compared with those obtained from real tests.
Ground Fault Protection for Electric Utility Generating Station Medium Voltage Auxiliary Power Systems
Most generating station designs have medium voltage auxiliary power systems with low resistance grounded neutrals.1 In order to provide even higher reliability, the auxiliary power distribution system configurations supply increasingly redundant process equipment.