ETO ETO Exam papers 📅 Mar 2022

Exam Question

With reference to Diesel Engine driven Alternators:

(a) Explain the significance of the term "Speed droop" during the parallel operation of alternators, Assuming two alternators are running in parallel, outline the frequency vs load characteristics of the alternators while load sharing (8)

(b) Two 3-phase alternators operate in parallel. The rating of A is 1000 kW and B is 800 kW. The droop setting of each generators is 4%. If the load to be shared by both the generators is 1000 kW. Calculate the load by generators A and B, if the original frequency at no-load is 62Hz.

Reference Answer

(a) Answer will be here soon
(b)
The frequency/ load characteristics (assumed straight) for alternators A & B as shown in figure. out of the combined load AB = 1000kW, A share is BM and B share is AM. Hence AM + BM = 1000kW. PQ is the horizontal line drawn through point C, which is the point of intersection.
Total load shared by alternator

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