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  • Users: bwen08
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  1. bwen08

    Rotary Phase Converter & Flicker

    I can't seem to find the magic site, paper or person to provide the info on rotary phase converters I'm after, and I bet someone here knows... For generalization, assume someone purchases a 30HP RPC to provide 3 phase power to a 15HP motor. What is the general inrush/flicker characteristics of...
  2. bwen08

    Type T Fuse-Fuse Coordination --- 75% Rule

    With "T" link fuses, Kearney, Chance, and others all have their charts showing the maximum fault current that various fuse amperes coordinate up to. I understand the 75% rule attempts to take into account preloading, damaged fuses and link temperature. My searching so far has failed to lead me...
  3. bwen08

    51N Relay Settings for Unigrounded Systems Feeding Delta Connected Loads

    I'm trying to find some further reference material on determining the ground relay settings for a 3 wire solidly grounded system that feeds delta connected loads. (i.e. sub-transmission feeders with Dy1 power transformers) What situations would cause sympathetic trips to occur if the ground...
  4. bwen08

    What IEEE80 Split Factor Curve to Use

    Hello, Some info is in order first I suppose. I have a substation, fed via a 34.5kV (3 wire) line. Transformer is 34.5/7.2kV Delta/Gnd-Wye. The fault current is 2kA on the 34.5kV side. Rg=2.8ohms This sub is also tied to the 34.5kV source sub via two 7.2kV (4 wire) distribution lines. Now...

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