Distance relay basics - what is meant by underreaching for a fault?

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Ever been confused by what is meant by a distance relay underreaching/overreaching for a fault vs an underreaching/overreaching element!

Watch this video to clear up the confusion! My objective is to explain the basic concepts without resorting to maths as I believe that maths could mask the understanding of the underlying principles. Proper understanding of the key concepts should precede the application of the requisite mathematics.

Enjoy!
  1. Powercrest
  2. distance
  3. relay
  4. underreach
  5. underreaching
  6. underreaching element
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Комментарии
Автор

in the end you say that even though the relay underreaches, the relay trips in zone 1 time.. how does the relay then calculate the correct fault fault location? from the line inductance only?

rajeshtk
Автор

Plz discuss on numerical distance relay advantages and disadvantages your ppt is good thanks.

rajthebes
Автор

Thanks for explaining very correctly.... But the video quality is poor not visible properly... As you explain excellent.. Please make a series of lessons explain full distance protection... Thank you

sureshpadhy