Electric Contacts: Theory and Application by Ragnar Holm

By Ragnar Holm

This publication is a totally revised and rewritten version of "Electric Contacts instruction manual" released in 1958. various new in­ vestigations are thought of, and lots of of the elemental theories are revised intimately or even typically. The physique of data needed to be constrained because it was once now not really useful to extend the quantity of the ebook. specifically, no try used to be made to hide all the useful purposes. they seem as examples following focused factors of uncomplicated phenomena. As in different branches of know-how, the suggestions of difficulties ari­ sing within the box of electrical contacts contain perception into a number of disci­ plines of physics. it's feit that studies of a few of these themes, especi­ best friend tailored to electrical touch phenomena, are welcome to many readers. for instance, chapters were dedicated to the constitution of carbon, the band concept of electrical conduction in solids, convinced seasoned­ blems in records, and the speculation of the electrical arc. As regards arc difficulties, new principles were brought. with the intention to make the most textual content much less bulky, such reports are provided as appendices. all through this version, the mksa-unit approach is utilized in accord with the newest suggestion for standardization of devices in clinical and technical writings. The bankruptcy "History of Early Investigations on Contacts" forming half IV within the previous variation of 1958 has no longer been repeated during this book.

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ProblemE. Constriction resistance R (n, a, l) of an assembly of n this problern but with a rougher apcircular a-spots (average radius = a, disproximation. In addition, they point tance between neighbouring centers = 21) uniformly distributed over a cirto the fact that the area enveloping the cular area with radius r. R (n, a, l) is a-spots in the case of rough surfaces compared with the constriction resisextends slightly beyond the HERTZ tance e/4 r . R (n, a, I) referred to one e/4r area that is calculated for ideally member, is plotted against l/a smooth surfaces, elastically deformed.

It comprises the resistance in 0 1 and two spreading resistances in the 0 2 electrodes. Let 0 1 have t he len gth l and the cross section na2 • Then the resistance of the cylinder 0 1 would be elfna2 , if the current flow were uniform all along l. At a cursory glance of Fig. 01) one could expect each of the spreading resistances t o b e e f4a a ccording to Eq. 14). At the ends Fig. 01). Current tlow near the bounof 01 the current becomes denser todary between a cylindric conductor c, and a semi-inßnite body c,.

As is described in Appendix I, the measured hardness, H, depends 011 the temperature, and on the time of the stress due to continued thermal diffusion of atoms under the influence of the stress. 16) shows how the constriction resistance, R, slowly decreases with time. The essential cause for this decrease will be that the strain in the structure, produced around the contact by the stress at contact make, more or Iess vanishes, enlarging the contact surface. 16) shows that 3E Stationary Contacts 38 silver contacts attain a rather permanent resistance after some days.

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