In order to solve the inaccuracy problem in calculating the actual voltage drop and the degree of three-phase load unbalanced of low voltage electrical load when takes no consideration of three-phase unbalanced load and non-ignorable neutral line impedance, a new safety monitoring method is presented by real-time monitoring of real voltage drop across the load. The new method establishes a high order equation model matching the equivalent impedance gird of real load of low voltage distribution network, base...
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