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Which type of distribution system is shown in the given figure?

Which type of distribution system is shown in the given figure? Correct Answer Bipolar DC distribution System

Types of HVDC Links:

Three types of HVDC Links are considered in HVDC applications which are

Monopolar Link:

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  • A monopolar link as shown in the above figure has one conductor and uses either ground and/or sea return.
  • In applications with DC cables (i.e., HVDC Light), a cable return is used.
  • Since the corona effects in a DC line are substantially less with negative polarity of the conductor as compared to the positive polarity, a monopolar link is normally operated with negative polarity.

 

Bipolar Link:

 

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  • Bipolar DC link as shown in the above figure has two conductors, one positive and the other negative. 
  • Each terminal has two sets of converters of equal rating, in series on the DC side.
  • The junction between the two sets of converters is grounded at one or both ends by the use of a short electrode line.

 

Homopolar Link:

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  • In this type of link as shown in the above figure two conductors having the same polarity (usually negative) can be operated with ground or metallic return.
  • Due to the undesirability of operating a DC link with ground return, bipolar links are mostly used.
  • A homopolar link has the advantage of reduced insulation costs, but the disadvantages of earth return outweigh the advantages.

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