Download Component Reliability by William F Waller AMITPP AssIRefEng (eds.) PDF

By William F Waller AMITPP AssIRefEng (eds.)

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Phenolic type mouldings are particularly susceptible to this form of tracking. mechanical aspects can help to maintain the quality and reliability of coils and transformers. Such factors as adequate mounting, especially for heavy items, leads correctly supported and terminated, adequate ventilation if required and vibration problems, must be given proper attention. Certain electrical performance parameters can be changed due to mechanical operations, a statement which is particularly true in the case of components having high permeability nickel-iron cores, which if subjected to excessive pressure or shock.

Many groups contain a few very noisy members. 32 Wearout in resistors may be due to slow degradation of organic materials, movement of impurities in a substrate, or oxidation of the resistive element over several years of continuous use. Manufacturers do not normally specify 'end of life', but rather a figure of maximum drift in the first 1 000 hours and another figure for each succeeding 1 000 hours. By far the majority of the following failure mechanisms are the consequence of defects in manufacture.

Metal cased or shrouded units but not hermetically sealed. 5. Epoxy resin encapsulated units. 6. Solventless varnish impregnated and enveloped units. 7. Hermetically sealed units. Typical components from each of these categories are shown in Figs 1-7 and, numbered accordingly. Dry units. As the name implies, this category covers all types of coils and transformers to which no further treatment has been applied after winding and assembly. These units are simply turns of wire, wound on a former or bobbin and then fitted with cores, tag panels, brackets, shrouds etc as required.

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