Circuit model-based single-phase earth fault section location method
A single-phase-to-ground fault, segment location technology, applied in the fault location, fault detection by conductor type, measurement devices, etc., can solve the difficulty of zero-sequence current single-phase-to-ground fault segment location, and cannot determine power distribution deterministically Network fault location, increase professional equipment and other issues, to achieve high economic value and social significance, reduce the scope of location, improve the effect of reliability
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[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0028] This embodiment includes the following steps:
[0029] (1) When a single-phase ground fault occurs somewhere in the distribution network, according to the data of the fault recording device (usually the transient fault recording device TFR), the bus at the power supply end of the area (denoted as M terminal, The fault zero-sequence voltage u of the next monitoring point far away from l is marked as N terminal) M0 and zero sequence current i M0 The sampling value of .
[0030] (2) Using the Mcquart method, the zero-sequence voltage u M0 and zero sequence current i M0 The discrete sampled values are fitted to obtain the continuous time function u M0 (t), i M0 (t).
[0031] (3) Using the distributed parameter circuit model:
[0032] A section of single-phase line is regarded as composed of infinitely many microelements c...
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