Description : Compare core type transformer and shell type transformer on the following parameters. (i) Types of winding used, (ii) Application
Answer : Ans:
Description : The high voltage winding is usually which of the following type ? (a) Cylindrical winding with circular conductors (b) Cross-over winding with either circular or small rectangular conductors (c) Continuous disc type winding with rectangular conductors (d) All of the above types
Answer : (d) All of the above types
Answer : Sandwich type winding is used in 3 phase shell-type transformer.
Description : State any two conditions for parallel operation of 3-phase transformer.
Answer : Conditions for Parallel operation of 3 phase transformer 1) Voltage ratings of both the transformers must be identical. 2) Percentage or p.u. impedance should be equal in magnitude. 3) X/R ratio ... between primary & secondary voltages must be same. 6) Phase sequence on both sides must be same.