Q9. Describe, with the aid of a diagram, a shaft generator that uses a frequency converter. (10)
Q11. With reference to a THREE phase electrical distribution system:
(a) discuss the advantages and disadvantages of an insulated neutral system; (8)
(b) state how an earthed neutral system is earthed and the measures taken to limit the maximum earth fault current. (2)
Q9. With reference to voltage variation profiles caused by load changes imposed on alternating current generators when starting large motors online:
(a) sketch a voltage dip, showing an acceptable recovery time; (2)
(b) state FOUR salient factors that cause the variation in part (a); (4)
(c) outline FOUR salient factors that assist recovery from the deviation shown in part (a). (4)
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