Effective earthing practices using software techiques

Τίτλος

Effective earthing practices using software techiques

Θέμα

Electric currents--Grounding

Computer software--Development

Δημιουργός

Paphitis, Kyriacos M.

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1999

Συνεισφέρων

Chrysafiades, Ch.

Efthymiou, Venizelos

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

EED0555

Σύνοψη

The following project will try to cover the vast domain of earthing techniques used against high fault voltages and currents.
The second chapter deals with the origins of the faults and how this unavoidable events i.e. lightning strikes are produced and how they can interfere the earthing system.
The third chapter explains the dangers of a fault and how the fault current can influence the humans according to it's magnitude. It also describes touch and step voltages and how this may cause damage to our health.
The fourth chapter shows the methods of earthing techniques used for houses and for some other buildings which are faced as special cases due to their 'strange' shape i.e. churches and wind mills.
The fifth chapter is especially dedicated to substation earthing techniques and an example of the earthing design of an E.A.C substation is included.
In later chapters we will try to understand why earthing is so important and why all the buildings must be always earthed. Let us see now the main reasons for using earthing techniques:
i) To protect people and livestock
ii) To protect equipment
iii) To permit the equipment to function correctly
iv) To ensure the reliability of electrical services /
In case of a fault (i.e. overload) or in case of a lightning strike a very high fault current is created which it must be dissipated to earth. This high current uses the earthing conductors to travel since the earth loop impedance is very low (this is a must for all cases of earthing and tables are used which determine the maximum resistance of such loops).
Now let us deal with the origins of such faults.