By Jean Claude Simon
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The associated power input would then cause rapid vaporisation of the whole of each notch. As an alternative, it could be taken that there are temperature gradients within an element and that it will be hottest at the centres of the restricted sections, causing vaporisation to commence at these points. The vapour escaping through the surrounding liquid could produce a hairline crack or gap across the notch. The vapour in the gaps is not ionised initially and capacitance is present across them. A similar situation must arise also with wire elements.
It probably must be accepted that it will always be necessary to determine fuselink characteristics by experimental means. The development of the modelling technique of Wright and Beaumont is outlined in the following sections. 1. Thereafter, calculation may proceed on a step-by-step basis to determine the voltage and current variations. e. the cathode-fall region, the anode-fall region and the positive column. These regions, which each Arcing behaviour of cartridge fuselinks 45 have their own properties, are considered in the following subsections and they may be dealt with separately in the model.
3. Fuselinks containing notched-strip elements may be made to reduce the current more rapidly during the arcing period by increasing the number of restrictions, because this leads to the establishment of several arcs in series and consequently a greater voltage across the fuselink. This must, however, be limited to a level which will not cause such a large rate of change of current that excessive voltages may be induced in inductive components, and upper limits for fuselinks voltages are quoted in specifications.