1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Detecting Phase sequence with light bulbs/ Short circuit voltage

  1. May 13, 2014 #1
    1. The problem statement, all variables and given/known data
    1) If one is using light bulbs to detect phase sequence then it is wise to connect them in series with circuit resistor. Why ?

    2) There is short circuit in phase "A". In which case is short circuit voltage larger, in four-drive (?) system or in three-drive (?) system ? Which system is cheaper ?

    3. The attempt at a solution

    1) Because otherwise light bulbs would have same brightness ?


    Any help would be much appreciated.
     
  2. jcsd
  3. May 13, 2014 #2

    NascentOxygen

    User Avatar

    Staff: Mentor

    Hi ESSVE. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

    (1) probably is referring to using light bulbs as an indicator of phase difference when trying to synchronize a 3 phase synchronous motor with the 3 phase mains.

    (2) probably refers to there being a short-circuit in phase A winding of a motor. But I don't understand the rest of the question.
     
    Last edited by a moderator: May 6, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Detecting Phase sequence with light bulbs/ Short circuit voltage
  1. Circuit w/ Light Bulbs (Replies: 15)

  2. Light bulb circuit (Replies: 1)

Loading...