Featured Paper by M.S. Yeoman
Trefoil cable formation is used where three phases are carried by three single core power cables rather than a single multicore cable. The advantage of installing three single core cables in such a configuration is that it minimizes the induction of eddy currents, which reduce the effect of localized heating, while maintaining the current carrying capacity of the circuit. Trefoil cleats, are structures used to hold the three single core power cables in a trefoil form, along the length of the laid cables. Manufacturers of trefoil cleats are required to physically test their cleat designs to failure in an applied test, where a section of three single core power cables are held with the cleats and then short circuited. The resulting high dynamic electromagnetic forces being produced from the short circuiting of the three single phase cables, need to be held & maintained by the trefoil cleat. These, physical test can be costly in terms of both cost & time. In order to reduce the cost of trefoil cleat design & development, a time-dependent COMSOL Multiphysics model, including currents, induced electromagnetic forces, material plasticity & contact analysis has been set up to fully describe and simulate the dynamic load conditions on the cable & cleat design. Comparisons to physical tests & calculations using the test standard & empirical data show excellent comparisons. The model developed can now be used to quickly assess trefoil cleat designs without the huge expense & time.
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