Transformer

Methods of Purifying and Drying Out of Transformer Oil Q. State the methods of purifying and drying out of transformer oil and explain any one method brief with neat sketch Q. Explain the filtering process for transformer oil filtration. Purifying of transformer oil : There are mainly following three types of oil filter in common … Read more

Properties of Transformer Oil  Q. 10 List the properties of transformer oil  Water content  Acidity  Density   Flash point  Fire point  Purity  Viscosity  Dielectric strength  Sludging 

Procedure for Back to Back Test on Transformer With Neat Circuit Diagram & Advantages and Disadvantages of this Method Q. Explain the procedure for back to back test on transformer with neat circuit diagram. State advantages and disadvantages of this method. If large transformer are to be tested for determining their efficiency, temperature rise regulation … Read more

Phasing Out Test Carried Out on Transformer Q. With the help of neat figure explain phasing out test carried out on transformer. Phasing out test : This test is carried out only on 3Φ transformer to identify primary and secondary winding belonging to the same phase. As shown in figure A all the phases of … Read more

Short Circuit Test is Performed on Single Phase Transformer Q. Explain how Short Circuit test is performed on single phase transformer. S.C. Test on single phase transformer This is mearly a short circuit test. Generally meters are connected in H .V. side to which a variable voltage can be applied with the help of a … Read more

Method of Filtration of Impure Oil Using Streamline Filter Q. With the help of neat figure explain the method of fitration of impure oil using streamline filter (vacuum type). Stream Line Filter (Vacuum Type) : Main part are :  Oil-inlet pipe  Heating chamber  Heaters  Purifier chamber  Filter packs  Vacuum tank  Motor  Pump Pure oil outlet  … Read more

Tests to be Carried Out on Transformer as per IS – 2026 Q. List out the tests to be carried out on transformer as per IS – 2026. Also state the objective Heat run on test on transformer. Routine Test Type Test Special Test Supplementary Test              

Back to Back Test for Efficiency of Transformer Q. Explain with neat sketch back to back test for efficiency of transformer. Connection-circuit diagram Primary of auxiliary transformer A and B an the two identical Y – Y connected transformers. One more transformer is needed called as an auxiliary transformer (C). This is also a Y connected … Read more

How Insulation Resistance of a Transformer is Measured Q. State how insulation resistance of a transformer is measured 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 windings, between … Read more