Power transformer divided into two categories which are dry type and oil-immersed transformer, with the aid of diagram, list and elaborate the type of cooling method for oil-immersed transformer.

3. Find the h parameters of the two-port circuit shown in Figure 3. 10 Ω j20 Ω 200 N V1 20 I2 100 N V2 Figure 3

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A 3-phase, 50 Hz, oil cooled core type transformer has the following dimensions: distance between core centres 0.4 m, height of window 0.48 m, dia of circumscribing circle 0.28 m. The flux density in the core is 3.00 Wb/m² and the current density in the conductors is 5.0 N/mm². Estimate the KVA rating. Assume a window space factor of 0.4 and a core area factor= 0.56 the core is 2 stepped.