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The iterative process of state estimation for nonlinear measurements of power system is terminated when (โ is specified tolerance for estimation)
X(p+1)est-X(p)est2โคโ
X(p+1)est-X(p)est2=โ
X(p+1)est-X(p)est2โฅโ
X(p+1)est-X(p)est2โโ