The amount of 2nd harmonics is too low in some cases during an inrush

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PS 1: Question 7 What would be the future practice for inrush detection? The amount of 2nd harmonics is too low in some cases during an inrush. An neural network can be an alternative in the future. Basic structure (at 16 samples/cycle)

PS 1: Question 7 Strategy at the design of a neural network (1) I: Using of information from one side, phase- segregated iaS1(t) Neuronal Network ANN 1 ibS1(t) iaS1(t) Neuronal Network icS1(t) ibS1(t) Neuronal Network Decision logic II: Using of information from all sides icS1(t) Neuronal Network iaS1(t) Neuronal Network iaS1(t) Preprocessing Neuronal Network ibS1(t) ibS1(t) icS1(t) Preprocessing Neuronal Network Decision logic iaS2(t) icS1(t) Preprocessing Neuronal Network ibS2(t) icS2(t)

PS 1: Question 7 Strategy at the design of a neural network (2) Combination of using the information from all sides iaS1(t) Neuronal Network ANN 2 iaS2(t) ibS1(t) Neuronal Network Decision logic ibS2(t) icS1(t) Neuronal Network icS2(t)

PS 1: Question 7 Strategy of pre-processing Goal: Improvement on the comparability of different data Expose of common features Simplification and reduction of the neural network Procedure: Scaling on the greatest value in the sampling interval Rotation of the values so that the greatest value is always the first one.

PS 1: Question 7 Simulation result strategy ANN1 and ANN2 Inrush of a transformer current a, b, c, Side 1 2nd harmonics in differential current Results of inrush detection with neuronal networks ANN 1 ANN 2