Single-phase-to-earth fault line selection method for distribution network based on negative-sequence impedance angle
A single-phase ground fault, negative-sequence impedance angle technology, applied in the direction of fault location, measuring electricity, measuring electrical variables, etc., can solve problems such as loss of function
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[0067] First, the basic principle of the present invention is briefly introduced.
[0068] by figure 2 The distribution network whose neutral point is grounded through the arc-suppression coil is taken as an example for illustration. When a ground fault occurs on phase A of line II, the negative sequence equivalent network is as follows image 3 As shown, U in the figure k2 Add negative-sequence equivalent power to the fault point. Therefore, the negative-sequence power caused by the fault flows from the faulted line to the busbar and non-faulted lines, which reflects the difference in phase relationship between the negative-sequence voltage and negative-sequence current of the normal line and the faulty line.
[0069] For the normal line Ι, the actual negative-sequence current and negative-sequence voltage of the port near the power supply terminal should satisfy Figure 4 indicated direction. Since the actual power grid and load always present the nature of resistive i...
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