The energy criterion is given by E ( t ) = ∑ i = 1 t ( s i 2 − t δ ) , δ = ∑ i = 1 N s i 2 N The energy criterion method uses a negative trend δ to separate the signal from the noise.
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Locating Partial Discharges in Power Transformers with Convolutional Iterative Filtering.
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