Judgment method of single-phase grounding fault in small current grounding system
A single-phase grounding fault and low-current grounding technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity.
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Embodiment 1
[0016] The single-phase grounding fault judging method of the small current grounding system of the present invention comprises the following steps:
[0017] The first step is to extract the transient current characteristic component W value .
[0018] The maximum value of the current wavelet analysis mode coefficient when the small current grounding system works normally and the maximum value of the current wavelet analysis mode coefficient when the ground fault occurs are taken as the transient current characteristic component W value In this embodiment, the small current grounding system of 10KV overhead line is taken as an example.
[0019] Suppose the wavelet function Ψ(t) is compactly supported, in L 2 (R) The wavelet transform with a translation of τ and a scale of s in space can be defined as
[0020]
[0021] For the convenience of calculation, the scale and translation need to be discretized. Let the scale S=2 -j , translation τ=ks=2 -j , the high efficiency...
Embodiment 2
[0059] The difference between Embodiment 2 and Embodiment 1 is that the single-phase statistical vector ξ of the small-current grounding system constructed in the third step is different, because in practice, the data difference of the current and electric field measurements of each line is relatively large , the transient change of the current is also relatively large, and the maximum value of the wavelet analysis modulus coefficient is also different. Therefore, it is difficult to establish a single-phase-to-ground fault Fisher classification model with fixed parameters suitable for all line branches. In order to solve this problem, it is necessary to establish a generalized classifier so that the classifier has the ability of self-adaptive self-learning. The adaptive establishment of classifier parameters specifically includes the following steps.
[0060] Step 1: According to the statistical law of electric field drop when single-phase grounding occurs, set the ground fau...
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