Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Negative reactive power

  1. Dec 16, 2013 #1
    In a three phase power system,delta connected 66kV transmission line,the reactive power in one of the line/phase is negative(capacitive) while the reactive power in the other two lines/phases is positive.What is causing the reactive power to be negative(capacitive) in this phase?What are some possible solutions towards mitigating this negative(capacitive) reactive power?
     
  2. jcsd
  3. Dec 16, 2013 #2

    dlgoff

    User Avatar
    Science Advisor
    Gold Member

    Welcome to Physics Forums.

    Adding capacitors will decrease the Vars, adding inductors will increase the Vars, or you can use the what's called a Synchronous Condenser which will either increase or decrease Vars.

     
  4. Dec 17, 2013 #3
    This could be caused by many things - How much are you talking about? How many VAR relative to Watts, if it is a small amount(near unity - or very low real power flowing) this could be a "normal" system condition, one line is actually more capacitive than the other lines. However is it is a significant amount of VARs at significant power - I would check that the CTs/PTs , instruments are connected properly. Is the POWER in that leg reversed as well?
    What device is being used to tell you that the PF is +/-? Is there any way to get a complete vector diagram of the readings.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Negative reactive power
  1. Reactive Power (Replies: 6)

  2. Reactive power (Replies: 1)

  3. Reactive Power (Replies: 5)

Loading...