Question 5 For the electrical installation shown in Figure Q5, it is required to provide time-current grading, using at

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Question 5 For The Electrical Installation Shown In Figure Q5 It Is Required To Provide Time Current Grading Using At 1 (115.83 KiB) Viewed 19 times

Question 5 For the electrical installation shown in Figure Q5, it is required to provide time-current grading, using at least 0.4 second as the selectivity margin. Suggest the TMS values of the two IDMT relays. Finally, generate a summary table of the approximate tripping times of all the overcurrent protection devices under all the four fault cases, when the IDMT relays are set according to your suggestion. (13 marks) А B C1 C2 OL CT СТ Load IDMT #A IDMT #B MCB #C is Type C Figure Q5 Parameters of the electrical installations are given below: IDMT Relay Plug setting CT ratio Fault current at the point at point (PS) (Given) A 125% 400/5 6000 A B 100% 200/5 5000 A Both IDMT relays are “1.33 second" type with a rating of 5A. The TMS can be set to any value between 0.05 and 1.0. Fault current at points C1 and C2 are (3000+ a*100) A and (2000+a*100) A, respectively. The rating of the Type C MCB is 32 A.