Online grid fault detection method based on relative protection entropy and nominal transition resistance
A technology of nominal transition resistance and relative protection entropy, which is applied in the field of on-line detection of power grid faults based on relative protection entropy and nominal transition resistance, and can solve the problems of not considering the calculation of transition resistance
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[0128] Figure 4 Test system for IEEE14 node. Each intelligent electronic protection device (Intelligent Electronic Devices, IED) selects the main protection, distance I segment, distance II segment, directional element, and distance III segment as protection signals. The following protection action values are underlined to indicate refusal or lack of action, and boxed to indicate false action.
[0129] Calculation example 1 single fault.
[0130] Assume that 10% of the A-phase fault on the side of the line L15 close to the bus B9. The main protection on both sides of the line L15 refuses to operate, and the distance II section protection of the adjacent line L14 malfunctions.
[0131] Protection for each IED: main protection, distance I segment, distance II segment, directional element, distance III segment
[0132] IED29:( 0 ,1,1,1,1), IED30:( 0 ,0,1,1,1), line 15.
[0133] IED27: (0,0,1,1,1), Line 14.
[0134] IED21: (0,0,1,1,1), IED22: (0,0,0,-1,1), line 12.
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