Alternating-current powerline thunderbolt shielding failure and counterattack recognition method
An identification method and transmission line technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as lightning strike faults that need to be further studied, and achieve clear physical concepts, easy implementation, and intuitive theoretical basis.
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[0048] When a lightning strike fault occurs on an AC transmission line, the above principles can be used to correctly identify lightning shielding faults and counterattack faults. The specific implementation process is as follows Figure 14 shown.
[0049] Specific steps are as follows:
[0050] 1) When the sudden change of any phase current |i(n+1)-i(n)|-|i(n)-i(n-1)| is greater than the setting value, the high-speed data acquisition with a sampling frequency of 1MHz and The wave recording device starts and records the current traveling wave waveform 10ms after the fault;
[0051] 2) Calculate the current traveling wave zero-mode component U using the Karenbauer transformation matrix 0 (t) and the line mode component U α (t), U β (t), as shown in formula (1):
[0052] U 0 ( t ) ...
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