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  • Vernon's Avatar
    1 Week Ago
    I guess you want to come up with all three values for both feeders to get all parameters of the load. In the case of the first load 1200KW at .8 - 1200/.8 = 1500KVA. The angle is 36.869 degrees so you have (sine) 900KVAR. Load 1 is fully described as 1500KVA, 1200KW, and 900KVAR. Load 2 at 800KVA and 300KVAR. The angle is ARC SIN 300/800 = 22.02...
    5 replies | 5469 view(s)
  • Vernon's Avatar
    1 Week Ago
    It would seem that the CTs would be connected in parallel, polarity marking connected together - parallel additive. If you had 200 A on feeder 1, that CT would source 2.5 Amps. If you had 200A on feeder 2, you also get 2.5 A from that CT. 400A total gives you 5 A so the relay should be set to 400:5. Answer A is close but there is no correct answer. It...
    5 replies | 1313 view(s)
  • Vernon's Avatar
    1 Week Ago
    The connection may have resulted in stray current flowing through the CT.
    2 replies | 611 view(s)
  • rig-electrician's Avatar
    1 Week Ago
    Question here we have been discussing can you perform a ground resistance test with a clamp on meter on an IT (Insulated form Earth) system with no Neutral. I am thinking that the answer is no since there is no return path for the induced signal to return on.
    0 replies | 126 view(s)
  • ktelectrician's Avatar
    2 Weeks Ago
    I worked as an electrician a long time. Working for local and commercial parties and currently active in this job.
    3 replies | 2365 view(s)
  • marvinray's Avatar
    2 Weeks Ago
    How do you figure out the distance required for a 3-point fall of potential test? I've heard you should drive your C2 anywhere from 3 to 10X the diagonal of the grid but I've seen other literature that give tables showing different values based on different distances. To keep things simple, let's say we had a building that was 100' x 200', how far out...
    0 replies | 271 view(s)
  • SecondGen's Avatar
    3 Weeks Ago
    How did you have your test leads setup? Its possible that the current on the neutral bus was splitting depending on your configuration. This could cause your secondary current to be less than expected because not all the test current is flowing through the CT.
    2 replies | 611 view(s)
  • Skyehaven40's Avatar
    3 Weeks Ago
    The company that you work with are responsible for that, by individual you can't take an exam. You need to read the NETA book, the requirements are there.
    2 replies | 1066 view(s)
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