A 30MVA, 3-phase, 50HZ 13.8kV, star-connected synchronous generator has positive, negative and zero sequence reactance, 15%, 15% and 5% respectively. A reactance (X,) is connected between the neutral of the generator and ground. A double line to ground fault takes place involving phases 'b' and 'c', with a fault impedance of jo.1 p.u. The value of X,(in p.u) that will limit the positive sequence generator current to 4270 A is Ans: 1.108

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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.