Deepakkumar Yadav
Impulse Test of Transformer Q. State how insulation resistance of a transformer is measured. Measurement of Insulation Resistance of Transformer Before commissioning the transformer it is necessary to know that the insulation resistance of a transformer is greater than a specified value, to avoid excessive leakage currents. Megger test for insulation are carried out between … Read more
Working of Inverter Inverters convert DC Power into AC Power. An inverter is used to produce an un-interrupted 220V AC or 110V AC (depending on the line voltage of the particular country) supply to the device connected as the load at the output socket. The inverter gives constant AC voltage at its output socket when … Read more
Sumpner’s Test Back to Back (Sumpner’s Test) (for two identical 1-phase Transformers) (Regenerative Test) Q. Explain the procedure for back to back test on transformer with neat circuit diagram. State advantages and disadvantages of this method. Q. Draw the experimental setup of the Sumpners test and state its advantage. Q. Draw the experimental set up … Read more
Ideal Transformer The ideal transformer has following properties. Negligible current for establishing flux in the core. There is no magnetic leakage. Windings have no ohmic resistance. So resistance of primary and secondary winding is zero. Consider an ideal transformer shown in Figure. The primary is connected to ac supply of V1 volt and secondary is kept … Read more
Parallel Operation of Transformer Q. What is the need of parallel operation of transformers? Discuss the conditions to be satisfied before connecting two 1-phase transformer in parallel. When the load current increases above the capacity of one transformer, we can connect one more in parallel instead of replacing the existing transformer with a bigger one. … Read more
Parallel Operation of Transformer Q. What is the need of parallel operation of transformers? Discuss the conditions to be satisfied before connecting two 1-phase transformer in parallel. When the load current increases above the capacity of one transformer, we can connect one more in parallel instead of replacing the existing transformer with a bigger one. … Read more
Ideal Transformers Q. Explain the characteristics of an ideal transformer. Q. What is an ideal transformer? Definition : The transformer which is free from all types of losses is known as an ideal transformer. It is an imaginary transformer that has no core loss, no ohmic resistance, and no leakage flux. The ideal transformer has … Read more
Selection of Current Density Q. How current density is selected is the design of transformer? The value of current density is used to determine area of conductors in primary and secondary windings. If we choose higher value of current density ; area of conductors in winding is reduced, this reduces, cost of conductor as well … Read more
Selection of Transformer Flux Density Q. How flux density is selected is the design of transformer? From the above discussion it is seen that valve of maximum flux density controls the core area. Thus if we select higher value of flux density (Bm) net core area (Ai) is reduced. So there is reduction of iron … Read more
Types of Transformer Winding (Disc and continuous disc winding of Transformer) Q. Draw neat sketches and discuss the special features of following winding used for 3 phase transformer : Cylindrical winding, Helical winding, Crossover winding, Disc winding. List the typical voltage and current ranges over which they are used. Different type of windings are used depending upon … Read more