Traveling wave distance measuring method and system based on grounding mode of arc suppression coil and small resistor connected in parallel
A small resistance grounding and arc suppression coil technology, applied in the field of power system, can solve the problems of weak traveling wave signal, lack of fault location method, large distance measurement error, etc.
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Embodiment 1
[0067] Reference figure 1 , The traveling wave ranging method under the mode of arc suppression coil parallel low resistance grounding, including:
[0068] Step S101, obtaining fault information, and judging the fault type according to the fault information;
[0069] Step S102, when the fault type is a single-phase ground fault, a small resistance connected in parallel with the arc suppression coil is turned on;
[0070] Step S103: Calculate the difference between the arrival time of the zero-mode component of the current traveling wave and the wave head of the line-mode component according to the current waveforms before and after the small resistance is applied, and determine the fault area where the fault point is located according to the difference between the arrival time;
[0071] Step S104, combining the fault area where the fault point is located, determine the fault section according to the fault section locating method;
[0072] Step S105, judging the type of the faulty line,...
Embodiment 2
[0120] The traveling wave ranging system with arc suppression coil connected in parallel with low resistance grounding includes:
[0121] A fault information judgment unit for obtaining fault information and judging the fault type according to the fault information;
[0122] The small resistance input unit is used to input a small resistance connected in parallel with the arc suppression coil when the fault type is a single-phase ground fault;
[0123] The waveform recording unit is used to calculate the difference between the arrival time of the zero mode component of the current traveling wave and the wave head of the line mode component according to the current waveforms before and after the small resistance is put in, and determine the fault point based on the difference between the arrival time Fault area
[0124] The fault section determination unit is used to determine the fault section according to the fault section locating method in combination with the fault area where the ...
Embodiment 3
[0128] EMTP software pair figure 2 The network shown is simulated and analyzed. Assume figure 2 The middle FTU4 and FTU5 are cable lines, and the other areas are overhead lines. In the simulation process on ATP / EMTP, the fault phases are all phase A, set the fault occurrence time as 0.1s, the neutral point resistance input time as 0.188s, which is the peak voltage time, and the sampling frequency is 2MHz. The line mode and zero mode wave speed of overhead lines and cables are shown in Appendix B, Table B1.
[0129] (1) Analysis of metallic single-phase grounding fault
[0130] Assume that the fault occurs at point K in section S, and the fault point is 10,000m away from point P and 30,000m away from the bus. Figure 4 These are the line mode and zero mode components detected by FTU9. by Figure 5 with Image 6 It can be seen that FTU9 detects the zero mode component first, and then the line mode component, which means that after the neutral point is put into the resistance, th...
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