Identification method for excitation surge current of transformer based on kurtosis and skewness
A technology of excitation inrush current and identification method, applied in electrical components, dimension measurement, fault location and other directions, can solve problems such as inrush current asymmetry and inrush current, and achieve the effects of good real-time performance, short judgment time and high accuracy rate
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[0036] Such as figure 1 As shown, the steps of the transformer excitation inrush current identification method based on kurtosis and skewness in this embodiment include:
[0037] 1) Initially set the first setting value and the second setting value Q set and a third setting P set .
[0038] In this embodiment, the value of the first setting value set in step 1) is the minimum operating current value of the transformer differential protection.
[0039] In this embodiment, the second setting value Q is set in step 1). set is 0.
[0040] In this embodiment, the third setting value P is set in step 1). set The value is 1.
[0041] 2) at the specified sampling frequency f S The differential current of the transformer is uniformly and uninterruptedly sampled to obtain the sampling value sequence {x(n)} of the differential current x(t), where n is an integer.
[0042] In this embodiment, step 2) specifies the sampling frequency fS The value of is N times the rated grid freque...
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