Thank you all for your helpful reply On Wed, Jun 6, 2012 at 5:20 PM, Idris Musa <[email protected]>wrote:
> Hi iman, > The values R and X in mpc.branch matrix are per unit quantities. If you > have R and X given in ohms/km the effective values in ohms must be > converted to per unit impedance. The base impedance can be calculated from > the given or assumed Base MVA and Base voltage. Given the sequence > impedance, it is enough to use the positive sequence R and X and convert to > per unit impedance assuming the network is transposed. Which the > assumption used in MATPOWER power flow computation. > Hope this will help. > Idris > ________________________________________ > From: [email protected] [ > [email protected]] On Behalf Of iman [ > [email protected]] > Sent: 06 June 2012 15:06 > To: MATPOWER discussion forum > Subject: Branch positive and negative sequence resistance and reactance > > Dear All, > > 1-In mpc.branch do r and x represent positive and negative sequences or > zero sequences? > 2- Are r and x per Kilometer or not? > > Thanks > Iman > > > -- Best regards Iman
