Deepakkumar Yadav
How Back to Back test is Performed on 3 Phase Transformer Q. Explain how back to back test is performed on 3 phase transformer. Back to back test on 3- phase transformer Back to back test as seen for the single phase transformers is also applicable in plus transformers. It is a regenerative test, requires … Read more
Impulse Voltage Withstand Test on Transformers Q. Describe the impulse voltage withstand test on transformers. Figure (A) Lightening impulse test : (This is a type test) In practice the transformer is subjected to lightening strokes and switching surges. In such case ordinary high voltage tests are not useful. The test voltage wave is generated by … Read more
Trouble Shooting Chart of 3 Phase Transformer Q. Explain the trouble shooting chart of 3 phase transformer. Sr. No Trouble/ symptoms Possibility of causes Tests/ Remedies/ Rectification 1 Insulation resistance between core windings lowered down Over heating. Moisture entry Lightening and switching surges. Check transformer coil. Replace or filter the oil. Dry the transformer. Check … Read more
Energy Conservation Opportunities in Transformer Q. Energy Conservation Opportunities in Transformer. Opportunities are : Use amorphous core containing ferromagnetic elements like Iron, Cobalt alloy of high resistivity than silicon steel. So low core losses. Use encapsulated dry type transformer. Use autowound (saving in copper) or tapped transformer. Use energy efficient transformer. Use low resistant better … Read more
Need of Energy Conservation in Transformer Q. State the need of energy conservation in transformer. Transformer is a vital power equipment in a power system, which plays significant role in generation transmission and distribution of electrical energy. Transformer operating efficiency directly affects the costs and benefits of the whole power system. In a typical power … Read more
Classification of Insulating Material as per IS Q. State the Classification of insulating material as per IS. No. Class Insulating Materials Uses 1 Y/ O Cotton, silk, paper vulcanized fibers wood PVC, VIR etc. Always used with impregnation. 2 A Cotton, silk, paper press, vulcanized fibers wood etc. Impregnated dielectric oil or varnish also some … Read more
Testing of Dielectric Transformer Oil Q. Explain how following test is carried for transformers. Testing of dielectric transformer Oil Dielectric strength test : The dielectric strength of transformer oil is carried out with testing kit which consist of a standard oil test which is approximately 100 X 60 mm in cross-sectional area and 85 mm high. … Read more
Hot Dip Method of Varnishing for a Transformer Q. Explain the hot dip method of varnishing for a transformer. Vacuum impregnation is carried out in a vacuum impregnation plant; which consists of a double jacketed vacuum impregnating chamber.It is having atop removing cover. There is separate varnished storing tank. A compressor cum vacuum-exhauster which can … Read more
Properties of Good Transformer Oil Q. State and explain any four properties of good transformer oil. The properties of good transformer oil or mineral oil are recommended by IS 335-1963. To maintain the properties. IS 1866-1961 is referred. Usually mineral oil grade B is used for switchgears, transformers. It should posses the following properties : … Read more
How Following Crackle Test is Carried for Transformers Q. Explain how following test is carried for transformers : Crackle test. Crackle test The objective of this test is to determine the presence of water or moisture in the oil. In this test a sample of transformer oil under test is taken in a test tube. … Read more