Grading of Cables

Friday, September 2, 2011

       We have seen that thew stress in the insulation is maximum at the conductor surface and minimum at the sheath. To avoid the breakdown of the insulation, it is necessary to have uniform distribution of stress all along the insulation.
       Practically some methods are used to obtain uniform distribution of stress. The process of obtaining uniform distribution of stress in the insulation of cables is called grading of cables.
       The unequal distribution of stress has two effects,
1. Greater insulation thickness is required, which increases the cost and size.
2. It may lead to the breakdown of insulation.
      Hence the grading of cables is done.
       There are two methods of grading the cables which are,
1. Use of intersheaths for grading 
2. Capacitance grading
Let us discuss these two grading methods in detail

Related Posts :
Use of intersheath for Grading
Capacitance Grading
Difficulties in Grading

2 التعليقات:

  1. amarnath reddy said...:
    This comment has been removed by the author.
  1. amarnath reddy said...:

    Very nice info your site contains sir.Its good to visit this site.
    Check out the below site for information on electricals and electronics

    Electrical Engineering Info

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