I believe it depends on the system and on the individual line. Presumably, you would set RATE_A to the less of the two limits.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Oct 5, 2012, at 8:48 AM, Mohammad Reza Salehizadeh <[email protected]> wrote: > As we know, there are two restricting constraints for the MVA flows a > transmission line: a) Thermal limitation b) Stability limitation that (b) is > more restricted. As Ray stated, currently MATPOWER consider RATE_A. Hence, Is > it more reasonable to consider Stability limitation in RATE_A for short or > mid-term power system analysis? > > -Reza > > From: Ray Zimmerman <[email protected]> > To: MATPOWER discussion forum <[email protected]> > Sent: Friday, October 5, 2012 5:39 AM > Subject: Re: comprehension question about RATE_A, RATE_B, RATE_C > > The only one that is used currently by MATPOWER is the long term rating > (RATE_A), which is used to limit the MVA flows when running an OPF. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Oct 4, 2012, at 9:51 AM, Cansu Yildirim <[email protected]> wrote: > >> Dear All, >> >> I’m trying to model a network containing different voltage levels and I have >> to take account of the load of each branch in my network, so that my lines >> are not overloaded. >> Therefore I wanted to fill in data for the long, short and emergency ratings >> (RATE_A,RATE_B,RATE_C). As far as I didn’t get anything wrong, these ratings >> define the allowable magnitude of the flow. Can anybody give me a proper >> definition? And how do they influence my power flow? How does matpower use >> this information? >> And I’m not sure how to calculate these ratings. Is it enough to know the >> maximum allowable operating current and voltage rating for the cables? >> >> I would be grateful for any help. >> >> Kind regards, >> >> Cansu Yildirim > > >
