8.4 Assume a differential relay with a slope of 20% and a pickup setting of 10.25 A (secondary) protects a 69/33 kV, 10 MVA transformer. Determine the CT ratios suitable for this protection system, assuming a 110% overload capability. What is the minimum primary fault current that the relay will detect when the transformer is operating at no load? What is the minimum fault current that the relay will detect when the transformer is carrying the maximum permissible overload?