Q. In the figure below, an 11 kV ring network is powered by a 10MVA generator with a reactance 16.5 pu. Overcurrent protection is used for keys S1, S2, S3 and S4. The time characteristics of the relays installed on the switches S1 to S4 are as follows S1,52,54 I.T=16.66 S3 I.T =25.4 The conversion ratio of protection current transformers is 250/50. The impedance of the lines is also indicated on the figure. If a short-circuit three-phase symmetric connection occurs at point F, Determine which of the keys is disconnected in order and the time of disconnection of each of them. Is local protection provided? X-16.5% 10 MVA. 11 kV Le j2 j3

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