Dear Carlos, Thank you for pointing out, however, can you tell me what's the answer to my questions?
Yours sincerely, Jiashen Teh PhD Student Electrical Energy & Power Systems Group, School of Electrical & Electronic Engineering Ferranti Building (B18), The University of Manchester, M13 9PL, United Kingdom Tel: +44 (0) 161 306 2263; Mobile: +44 (0) 792 322 4864 ________________________________________ From: [email protected] [[email protected]] on behalf of Carlos E Murillo-Sanchez [[email protected]] Sent: 12 July 2013 02:01 To: MATPOWER discussion forum Subject: Re: conductor resistance and power rating (MVA) Dear Jiashen: The model used in Matpower is the standard pi one-line equivalent of a three phase transmission line, with quantities in per-unit. This is constructed from a base voltage equal to sqrt(3) times the phase voltage and a base power equal to three times the per-phase power. With this choice of base quantities, the base impedance is equal to the per-phase impedance. This is covered in most power systems analysis textbooks. carlos. Jiashen Teh wrote: > Dear Dr Ray, > > Before asking my question, allow me to put us on the same level of > understanding. > If I am not mistaken, each transmission line in reality is actually > consists of 3 conductors connected in parallel. > > Hence, these are my 2 questions based on the above assumption: > > The resistance values in Matpower are > (a) the total resistance of 3 conductors connected in parallel? > or > (b) the resistance for only one of the three conductors? > > > The line ratings in Matpower are > (a) the total rating for 3 conductors connected in parallel? > or > (b) the rating for only one of the three conductors? > > > Yours sincerely, > > Jiashen Teh > PhD Student > Electrical Energy & Power Systems Group, School of Electrical & > Electronic Engineering > Ferranti Building (B18), The University of Manchester, M13 9PL, United > Kingdom > Tel: +44 (0) 161 306 2263; Mobile: +44 (0) 792 322 4864
