Types of distribution system

 Types of the distribution system.

  1. Three phase three wire systems.
  2. Three phase four wire systems.

Three phase three wire systems

  • This system requires 3 wires or conductors for distribution. Maybe connected in star or delta. If star connected then star point is connected to earth i.e. zero potential of 3 phase natural and balance i.e. magnitude of the current should be same in each phase an electrical   load of single phase nature cannot be connected.

  • Three-phase systems are used extensively. The 3-wire system may be delta-connected or star-connected whose star point is usually earthed.

  • Basically, 3-wire 3-phase systems save one conductor, the neutral, in overhead construction.
    In a service (600 volts and under) the source transformer winding is a delta or an open-delta. In California, if the voltage is 240V, then one of the corners is grounded. If it is 480V then it is ungrounded.
    As a distribution system, the source transformer is typically a grounded wye winding and the neutral just is not extended outside the substation.

Three phase four wire system

Three phase four wire system

Three phase four wire system

  • This system requires 4 wire or conductor for distribution instar only, the star point is also called neutral an electric load of phase and signal phase can be connected.

Three phase four wire system

Three phase four wire system

3 phase wire transmission \ 3 phase 4 wire utilization

Generated power is transmitted and distributed through.

  1. Overhead transmission lines.
  2. Undergrounded transmission cables.

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