Download e-book for iPad: Design of Electrical Services for Buildings by F. Porges

By F. Porges

ISBN-10: 0419145907

ISBN-13: 9780419145905

Electric companies are an important and expensive part in any glossy construction. it truly is crucial that development pros comprehend the fundamental ideas of prone layout. For the recent version of this good confirmed booklet the writer presents a simple grounding within the layout of electric prone. all through, the emphasis is at the wishes of the layout engineer and the e-book describes equipment of layout with examples of calculations and methods of install.

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Extra resources for Design of Electrical Services for Buildings

Sample text

All the other rules regarding the parallel connection of single-phase transformers would be applicable for three-phase systems. The delta primary is normally used when the supply source is delta connected. The delta secondary is normally used only when the load requires a single voltage and a high current. The load should be balanced so that an equal amount of current is supplied by X2 c b i ú XI X2 ' > B X1 X2 c X1 i / FIGURE 2-20. Transformer connected for delta primary, wye secondary. The wye connected secondary is accomplished by first wiring the X2 terminals of the three transformers together and tying them to a neutral ground.

Usually, the neutral of each of the primary windings must be tied together if the system is operating with unbalanced loads. When this is not done, the voltage across the largest load with drop, and the voltage across the other two single-phase loads will increase. When three single-phase transformers are used, this system is incapable of supplying an appreciable single-phase load from line to neutral without a serious shift in the neutral. An exception to this is single-unit three-phase transformers with a common core which can give good results.

4 V X1#- G1 208 V :« I FIGURE 2-34. Effects of grounding the midpoint of the boost transformers. ) The average electrician is accustomed to connecting the midpoint of a 120/240-volt secondary ground. This is when the trouble begins. G and X0 are not the same electrically in this circuit. A potential of 60 volts exist between the two points in this case. This is shown pictorially by the dotted line between X0 and Gl. G and Gl are electrically the same point with a zero potential between them, Connecting X0 to G causes a short circuit.

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Design of Electrical Services for Buildings by F. Porges


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