Q385 : Effects of Fault Clearing Time on Safety Thresholds

Question
I get different values for the safety thresholds computed for a fault clearing time of 0.5 seconds when I compare the results of the 2002 version of CDEGS with older versions. What has changed?


Answer
The difference is due to a new computation method for the decrement factor. For a fault duration of 0.5 seconds, it is now recommended to use the exact formula for the decrement factor for all values of the fault duration. Previously, the recommendation was to use 1 for all fault duration times >= 0.5 s.


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  • Created on 12/04/2002
  • Last Modified on 12/02/2004
  • Last Modified by Administrator.
  • Article has been viewed 14178 times.