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  1. silkwormfrog

    Operation of the SF6 Circuit Breaker with a gas leak

    Hi I am trying to write up a procedure in a event of a SF6 gas leak. My understanding is the circuit breaker will still be able to operate. Can anyone confirm if this is the case, and does the operation of the Circuit Breaker been affected at all with low or no SF6 gas present? Thanks
  2. silkwormfrog

    AS3851 Unable to calculate X/R ratio

    Thanks for the comments. The fault level is given by the supply authority. And this is a 22kV distribution network.
  3. silkwormfrog

    AS3851 Unable to calculate X/R ratio

    Hi I have trying to calculate the fault level (ground fault) by using AS3851 method. In section 8.5.2.1, the factor k for the R/X and X/R ratios can be obtained using k = 1.02 + 0.98 * e ^(-3R/X). I have been given the following: the source 3 phase max. fault level 3800A the source 3...
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