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4-Wire, Three-Phase Delta System

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Electrical Distribution Systems WIRING SCHEMES AND GROUNDING The upper diagram depicts the Figure 17    3-Wire, Three-Phase Delta Scheme ungrounded    Delta,    normally confined to protected environments    such    as    fully enclosed   ducts   or   overhead transmission  lines  that  cannot b e r e a c h e d w i t h o u t extraordinary means. Each conductor’s  ground  voltage  is equal to the full phase voltage of the system. The   lower   diagram   shows   a ground   point   affixed   to   one corner   of   the   Delta,   which effectively lowers one  phase’s voltage reference to ground to zero,   but   retains   a   phase-to- phase  voltage  potential.    The corner-grounded  phase  acts  in much   the   same   way   as   the grounded neutral of the single- phase Edison system, carrying current and maintaining ground potential. The    corner-grounded    Delta system has an obvious economy  in  wiring  costs,  and the   grounded   phase   can   be used  to  physically  protect  the other two phases from accidental grounding or lightning strikes in outdoor settings.   This system is rarely used for low voltage (under 600 V), however, because of the absence of a safety ground required by many facilities for circuits involving potential worker contact. 4-Wire, Three-Phase Delta System The 4-wire, three-phase Delta system combines the ungrounded Delta discussed above for three- phase loads with the convenience of the Edison system for single-phase loads.   As depicted in the  example  illustration  in  Figure  18,  one  side  of  the  Delta  has  a  grounded-neutral  conductor connected to a center tap winding on one phase. Rev. 0 Page 25 ES-15



   


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