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CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

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  • CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

    Hello,

    Please help how do I calculate Current (Amps) in a 3 phase circuit with 6.4KW 400V supply.

    Thanks
    Ray

  • #2
    Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

    Please help how do I calculate Current (Amps) in a 3 phase circuit with 6.4KW 400V supply.

    Thanks
    Ray[/QUOTE]

    Comment


    • #3
      Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

      Simplified answer,
      P = V x I x √3
      6,400 W (6.4kW) = 400 x I x 1.732
      I = 9.2 A

      Comment


      • #4
        Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

        In case of 3 Phase calculation, We can use the formula,

        I = W / ROOT-3 x V x PF

        ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

        So,W = 6.4KW = 6400WATTS, V = 400

        By Using the above formula,

        I = 6400 / 1.732 x 380 x 0.83

        = 6400 / 546.272

        = 11.71A

        Comment


        • #5
          Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

          In case of 3 Phase calculation, We can use the formula,

          I = W / ROOT-3 x V x PF

          ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

          So,W = 6.4KW = 6400WATTS, V = 400

          By Using the above formula,

          I = 6400 / 1.732 x 380 x 0.83

          = 6400 / 546.272

          = 11.71A

          Email : rajeshkumarbec@yahoo.com

          Comment


          • #6
            Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

            Originally posted by RAJESH KUMAR View Post
            In case of 3 Phase calculation, We can use the formula,

            I = W / ROOT-3 x V x PF

            ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

            So,W = 6.4KW = 6400WATTS, V = 400

            By Using the above formula,

            I = 6400 / 1.732 x 380 x 0.83

            = 6400 / 546.272

            = 11.71A

            Email : rajeshkumarbec@yahoo.com
            its not 380V for your information, the given voltage is 400V i know what you are trying to say but sorry to say it is 400V.

            Comment


            • #7
              Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

              For a three phase

              P = 1.73 * I * V * p.f

              I = P / ( 1.73 * V * p.f)

              I = 6400 / ( 1.73 * 400 * 0.8 )

              I = 6400 / 553.6

              I = 11.56 A

              Comment


              • #8
                Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                as we got I now if we wnt to calculate energy consumption can v use
                E=V*I or sqrt3*V*I or sqrt3*V*I cos phy for three phase syatem

                Comment


                • #9
                  Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                  if Power is given in KW, then we don't need to use Power Factor (PF) because
                  kW = V x I P.F. x 1000 and
                  kVA = kW P.F. so you can calculate as below.

                  P= 6.4KW
                  V= 400V
                  I= ?
                  I (Amp) = P*1000/(√3*400) 6400/(692.8) = 9.23

                  Comment


                  • #10
                    Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                    In case of 3 Phase calculation, We can use the formula,

                    I = W / ROOT-3 x V x PF

                    ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

                    So,W = 6.4KW = 6400WATTS, V = 400

                    By Using the above formula,

                    I = 6400 / 1.732 x 380 x 0.83

                    = 6400 / 546.272

                    = 11.71A

                    Comment


                    • #11
                      Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                      Originally posted by thomasjoseph87@yahoo.com View Post
                      In case of 3 Phase calculation, We can use the formula,

                      I = W / ROOT-3 x V x PF

                      ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

                      So,W = 6.4KW = 6400WATTS, V = 400

                      By Using the above formula,

                      I = 6400 / 1.732 x 380 x 0.83

                      = 6400 / 546.272

                      = 11.71A
                      Thats wrong, where is this 380V coming from?

                      Comment


                      • #12
                        Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                        people trying to make this too complicated.

                        get power used ie 6.4kw = 6400w

                        divide by voltage ie 400v

                        then root 3 this. if you don't have a scientific calculator just devide by 1.732

                        Comment


                        • #13
                          Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                          Originally posted by RAJESH KUMAR View Post
                          In case of 3 Phase calculation, We can use the formula,

                          I = W / ROOT-3 x V x PF

                          ie, W = WATTS, ROOT-3 = 1.732, V = VOLT, PF = 0.83

                          So,W = 6.4KW = 6400WATTS, V = 400

                          By Using the above formula,

                          I = 6400 / 1.732 x 380 x 0.83

                          = 6400 / 546.272

                          = 11.71A
                          in this ans. how you calculate the power factor

                          Comment


                          • #14
                            Problem: Calculating 3-phase power in unbalance voltage and current.

                            Hi.... somebody help me in solving this problem?

                            P=?

                            Given:
                            Vab= 800 V
                            Vbc= 12,800 V
                            Vca= 11,100 V
                            IA=93
                            IB=293
                            IC=332

                            Comment


                            • #15
                              Re: CAlculating Current in a 3 phase circuit with 6.4KW 400V supply

                              Is the current calculated for each phase?

                              Comment

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