Small current grounding line selection method based on residual current variable
A technology of small current grounding and wire selection method, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as difficult to accurately measure the fifth harmonic value, unsatisfactory practical effect, and low accuracy of wire selection , to achieve the effect of good practicability, controllable cost and easy realization
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[0027] In the present invention, a method for grounding line selection by changing the operating state of the arc suppression coil is disclosed. figure 1 It is a system model in which the neutral point of the distribution network is grounded through the arc suppression coil. When a single-phase grounding fault occurs in the distribution network, after confirming the fault status, adjust the arc suppression coil to a gear, which will produce obvious zero sequence current characteristics The quantity is conducive to accurately selecting the faulty line.
[0028] figure 2 In the event of a single-phase ground fault, the equivalent circuit of the distribution network connected to the arc suppression coil. U in the picture 0 Is the neutral point displacement voltage; U ψ Is the system phase voltage; R d Is the grounding resistance; L is the inductance of the arc suppression coil; C is the single-phase-to-ground capacitance of the system; I δ It is the residual current after arc supp...
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