Various Systems of Power Transmission

It has already been pointed out that for transmission of electric power, 3-phase, 3-wire a.c. system is universally adopted.  The different possible systems of transmission are :

1. D.C. system

  1. D.C. two-wire.
  2. D.C. two-wire with mid-point earthed.
  3. D.C. three-wire.

2. Single-phase A.C. system

  1. Single-phase two-wire.
  2. Single-phase two-wire with mid-point earthed.
  3. Single-phase three-wire.

3. Two-phase A.C. system

  1. Two-phase four-wire.
  2. Two-phase three wire.

4. Three-phase A.C. system

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

 

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