ELETTROTECNICA ESERCIZI SVOLTI CANOVA PDF
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Esercizi svolti - Canova Aldo, Gruosso Giambattista Acquistalo su Questa raccolta di esercizi ed esempi di elettrotecnica nasce da una richiesta, avanzata da Canova, G. Gruosso, M. Esercizi svolti. Esercizi svolti - Aldo Canova, Giambattista Gruosso Esercizi svolti - Aldo Canova, Giambattista Esercitazioni di Elettrotecnica - Ing.
Gerardi - A. Elettrotecnica Esercizi Svolti Canova Pdf Download … ; elettrotecnica esercizi svolti canova pdfelettrotecnica esercizi svolti canova pdf downloadelettrotecnica esercizi svolti canova 3bab8f9f9d Download,,,Sika,,,grout Esercizi di Elettrotecnica - dee. Canova Esercizi di Elettrotecnica Gruosso Politecnico Esercizi svolti - Aldo Canova, Gruosso The Standard IEC allows to choose the cable it is possible to specify the dimension and the material of each cable layer and the layout cables in air or buried.
In case of underground cables, the user can decide how the cables are buried directly in ground or in conduits , the material surrounding the system and the ambient temperature. In the normal practice, in case of buried cables, it is not unusual that there are external heat sources in addition to the power line cables.
And the power line is not always supplied by a costant current; it can be supplied by a load curve and there can be a transient.
Moreover in some configurations the 2D section changes along the third dimension, therefore a 2D model is very conservative: a 3D analysis is useful.
In all these cases where the Standards are not applicable, another method can be applied. The method has been applied to study a particular part of the power line: the junction zone. In the junction zone the magnetic field is higher and it can be necessary to shield the power line.
If this system is applied a thermal analysis of the junction zone has to be performed because of the presence of a new set of conductors, in addition to the power line cables. The two authors have developped the work done by D.
In their paper Neher and McGrath considered also the developments happened in the cables sector in the following 25 years. The Neher-McGrath NM method is a guide to calculate the temperature rise and the current-carrying capacity of cables. The NM method uses steady-state equations: the effect of operation under a repetitive cycle is considered, but the transient, due to a sudden application of a large load, is not considered.
Appendix I of  contains the equations to compute the Figure 1.
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In the case of buried cables it is also computed a resistance for the earth portion of the thermal circuit, that considers the mutual heating effect of the other cables of the system. Each of these temperature rises can be considered as the result of the heat flowing through a thermal resistance.
The heat flow in the thermal circuit increases in steps because the losses occur at several points in the cable. From Eq.
In  the NM method is explained with some numerical examples. The ampacity is calculated in the case of aluminum and copper cables.
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All these adjustment factors have been computed by a computer program based on the Neher-McGrath method. It is difficult to know the maximum operating ambient temperature: an estimate can be made considering historical meteorological data.
For buried cable the ambient temperature is defined as the maximum soil temperature at the depth of installation at peak summertime. The soil temperature changes during the year, but these seasonal variations can be neglected when the cables are installed at a depth of 7—10 m. The factor Fth is calculated based on the assumption that the soil has a uniform and constant thermal resistivity.
It depends on many factors soil texture, moisture content, density, structural arrangements of the soil grains , but in 7 Chapter 1 general higher density or moisture content of the soil results in a better heat dissipation and lower thermal resistivity.
The factor Fg takes into account the fact that grouped cables operate at a higher temperature than isolated cables, because there are more heat sources.
The ampacity value calculated with this manual method can be used as input for computer programs that implement more complex model. Many computer programs calculate cable temperatures for a given ampere loading, or a cable ampacities when the temperature is fixed. For all the possible cases the ampacity I is calculated. All the ampacity formulae come from the expression of the temperature rise above the ambient temperature 1.
Figure 1.The factor Fth is calculated based on the assumption that the soil has a uniform and constant thermal resistivity. PDF Formatted 8. Esercizi svolti - Aldo Canova For buried cable the ambient temperature is defined as the maximum soil temperature at the depth of installation at peak summertime.
Whereas a normal laser printer gives a positive
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