Transformer

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

Transformer Oil name In transformer we mostly use Transformer Mineral Insulating oil. Paraffinic Oil  Naphthenic Oil Bio Based Transformer Oil Silicone Based Transformer Oil 1. Paraffinic Oil It is use where Transformer have high rating current. It is part of Mineral Insulating oil. 2. Naphthenic Oil It is use where Transformer have low rating current. It is part … Read more

Types of Transformer Winding (Cross Over 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 voltage, current … Read more