Negative Sequence Filter
Negative Sequence Filter
(OP)
Hi
Could anyone refer me to a book or some other resource where I would find how elementry sequence filters can be used to measure negative sequence voltages and current. Thanks
Could anyone refer me to a book or some other resource where I would find how elementry sequence filters can be used to measure negative sequence voltages and current. Thanks






RE: Negative Sequence Filter
See Thread238-34288 for discussion.
RE: Negative Sequence Filter
but do you know if I could get an online version of the book Westinghouse "Applied Protective Relaying,?
RE: Negative Sequence Filter
RE: Negative Sequence Filter
RE: Negative Sequence Filter
I- = Ia + alpha Ib + alpha^2 Ic where alpha is exp(j*120degrees). Or you may have to switch the coefficients of Ib and Ic. Please look it up and double check me.
So if you start with Ia, Ib, Ic, and want to compute directly from the definition, you need to figure out ways to come up with 120 degree phase shifts. One way is a 60 degree phase shift combined with reversal (180-60-120).
I'm suspect there are a variety of other ways to tackle it than to apply the definition directly.