Electrical Machines IV Transformer Design Task You are required to do a transformer design task as part of the requirements for this course. Although you will not be required to build the designed transformer to test its functionality, you will however be assessed on the complete design document that you submit. The transformer is a three-phase core or shell type earthing (grounding) transformer with the following characteristics (Core or shell type transformer to be decided by student based on student’s research findings): ? Short circuit current capacity for 10 secs short circuit 1000A ? Nominal Voltage 33kV primary; 33kV Secondary ? Frequency 50Hz ? Connection student to determine based on research The transformer is to be of the self-air cooled type and must carry its rated load continuously with a temperature rise that should not exceed 55°C. The full load 100% power factor efficiency must not be less than 98.2%, and the ratio of core loss to copper loss should be 0.90. ? Note: o Assume a reasonable flux density within the core. o Ratio of core weight to copper weight is 3.76. o A cruciform core section should be used for this transformer design exercise. o Spell out all calculation and mathematical steps taken in the design exercise o The current density in the high voltage winding is 3.0 A/mm2, while the current density in the Low voltage winding is 2.8A/mm2. o The low voltage winding should be of the helical-wound coil with transposed conductors o The insulation between the low voltage and the core consist of a pressed paper cylinder of 3.175mm. o The high voltage winding should be of the disc coil type, and consist of a pressed paper cylinder Your design should amongst other things clearly establish the followings: ? Number of turns for the high voltage and low voltage windings ? Full load current in the two windings ? Section area of the high voltage and low voltage windings ? Length of the yoke ? Weight of the core ? Dimensions of the window area ? The…