ISEP - DEE - Neutro à Terra - Revista Técnico-Científica - 2017 (Nº 19)
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- Cable laying and pullingPublication . Bolotinha, ManuelThe common methods of cable laying are: • Direct in the ground in trenches (underground cables). • In cable trenches in outdoors switchyards. • In cable trays or cable ducts • Fixed with clamps (usually at walls and ceilings). • In conduits.
- Conducting and insulating materialsPublication . Bolotinha, ManuelConducting materials may be classified into three groups: conductors, semiconductors and imperfect insulators. This section will cover only conductors. In general, metals and alloys are conductors of electricity. The most common metals used in electricity are copper, aluminium and their alloys.
- Types and construction of power transformersPublication . Bolotinha, ManuelTransformers may be classified according to dielectric insulation material as follows: • Oil-filled transformers • Dry type transformers