Positioning method of fault points in power distribution network mixed circuits
A technology of hybrid lines and positioning methods, applied in the field of electric power, can solve problems such as poor stability, and achieve the effects of eliminating influence, accurate and effective calculation results, and improving efficiency and accuracy.
- Application Information
AI Technical Summary
Problems solved by technology
(1) Simulation Example 1:
A single-phase grounding fault occurred at 2.500km from No. 3 in section 3-4 of the overhead line. After the fault, the traveling wave distance measuring devices at the measuring terminals M and N were started and recorded the initial fault traveling wave arrival time as 0.0201079s and 0.0200046s respectively. The traveling wave distance measuring device recorded the initial fault traveling wave waveforms at the measuring terminals M and N And its corresponding wavelet transform system, as shown in Figure 2a)-Figure 2d).
After calculating △t=103.3us, corresponding table 2 can be obtained, the fault zone is located between section 3-4, the distance between the fault point and node 2 is 2.482km, and the error is 0.018km.
(2) Simulation embodiment two:
A single-phase grounding fault occurred in the 2-3 section of the cable line 1.500km away from the No. 2 node. If ε is 1.002 and △l is 10m, the actual physical length of the line between the fault point and the measurement terminal M should be 16.554km. The arrival time of the fault traveling wave detected at the measuring terminals M and N is 0.0200669s and 0.0200457s respectively. The initial fault traveling wave waveforms at the measuring terminals M and N recorded by the traveling wave distance measuring device and their corresponding wavelet transform systems are shown in the figure 3a)-Figure 3d) shown.
After calculation, △t=21.2us, corresponding to Table 2 can be obtained, the fault interval is located between the section 2-3.
Compared with the conventional ranging method, the conventional FLT mode can get the fault point to be 16.401km from the M end with an error of 0.099km. Accurately calculated the fault distance is 16.557km, which i...
(3) Simulation embodiment three:
A single-phase ground fault occurred at 0.040km from No. 1 in section 1-2 of the overhead line. The arrival time of the fault traveling wave detected at the measuring terminals M and N is 0.0200840s and 0.0201621s respectively. The initial fault traveling wave waveform at the measuring terminal M and N recorded by the traveling wave distance measuring device and the corresponding wavelet transform system are shown in the figure 4a)-Figure 4d) shown.
After calculating △t=-78.1us, corresponding table 2 can be obtained, the fault zone is located between section 1-2, the distance between the fault point and node 2 is 0.023km, the error is 0.017km. Compared with the uncorrected time node, the fault point is incorrectly judged to be between zone 0-1. In the conventional mode, the fault point is 2.978km away from the M end, with an error of 0.062km. It can be seen that the node time difference determined by the present invention improves the accurac...
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