6. Voltage distribution in a transformer winding exposed to a transient voltage A simplified geometry of a transformer winding is shown below V=VHA x=H Core V=0 x=L Om 1 13 r3 a) (2p) Which of the following curves (1,2 or 3) could describe the voltage distribution between a point on the winding and ground, if such a winding is exposed to an incoming transient overvoltage between the high voltage side and ground? (Motivate your answer). Vx) 1 Vo 3 X=H b) (2p) Make an equivalent circuit of the transformer winding and its surrounding that consists of capacitances only. Explain how you proceed in order to calculate the necessary capacitance values in the model. (What typ of information you would need etc.) Formulas are not necessary. c) (1p) The model with capacitances in b) is only valid for very fast transients. How would you modify the model so that it also could describe also other type of transients. 6. Voltage distribution in a transformer winding exposed to a transient voltage A simplified geometry of a transformer winding is shown below V=VHA x=H Core V=0 x=L Om 1 13 r3 a) (2p) Which of the following curves (1,2 or 3) could describe the voltage distribution between a point on the winding and ground, if such a winding is exposed to an incoming transient overvoltage between the high voltage side and ground? (Motivate your answer). Vx) 1 Vo 3 X=H b) (2p) Make an equivalent circuit of the transformer winding and its surrounding that consists of capacitances only. Explain how you proceed in order to calculate the necessary capacitance values in the model. (What typ of information you would need etc.) Formulas are not necessary. c) (1p) The model with capacitances in b) is only valid for very fast transients. How would you modify the model so that it also could describe also other type of transients