negative and zero sequence resistance
negative and zero sequence resistance
(OP)
Hi All
On HV overhead line and underground cabling systems, how do the negative and zero sequence RESISTANCES differ from the positive. Can they be assumed to be similar? I don't have a problem with the reactances ... just need to know more re the resistances.
Any help anyone?
Thanks
Graeme
On HV overhead line and underground cabling systems, how do the negative and zero sequence RESISTANCES differ from the positive. Can they be assumed to be similar? I don't have a problem with the reactances ... just need to know more re the resistances.
Any help anyone?
Thanks
Graeme






RE: negative and zero sequence resistance
RE: negative and zero sequence resistance
Are you sure you know about zero-sequence reactance? I can't imagine someone knowing all about zero-sequence reactance without knowing that the zero-sequence resistance differs from the positive-sequence resistance. Anyway, the zero-sequence reactance also includes the effect of the earth and ground wire return paths.
Carson's equations, as given in the Westinghouse T&D Reference Manual are used to calculate the resistance and reactance values.
RE: negative and zero sequence resistance
RE: negative and zero sequence resistance
Z0=Z0(a) - Z0²(ag)/Z0(g)
where Z0(a) = zero-seq self impedance of the 3ø circuit.
Z0(g) = zero-seq self impedance of the ground wires.
Z0(ag) = zero-seq mutual impedance between the 3ø circuit as one group of conductors and the ground wire(s) as the other conductor group.
Z0(g) and Z0(ag) include the effect of earth return.
RE: negative and zero sequence resistance
RE: negative and zero sequence resistance
RE: negative and zero sequence resistance