Deepakkumar Yadav
ydeepak297@gmail.com Open Delta Method of Testing of Transformer Q. Explain open delta method of testing of transformer. The method of transforming 3-phase power by 3 windings i.e. 3 transformers is a regular ordinary method in which 3 units of 10 KVA will supply a power of 3 x 10=30 kVA. But it is possible to transforms … Read more
Energy Conservation by Co-generation Co-generation is the method (way) of conserving the energy. In main generation, the energy is converted into another form of energy say-hydro to electrical, thermal to electrical, diesel oil to electrical But in these conversions, a large part of energy is wasted and small part is converted. This loss of energy … Read more
Requirement of Foundations for Installing Rotating Electrical Machines as Per IS 900-1992 Q. What are requirement of foundations for installing rotating electrical machines as per IS 900-1992 ? A solid foundation of concrete is provided for the installing of rotating machine. To avoid misalignment of plate proper mounting of the machines, the motor or prime … Read more
Precaution Every House Holder Should Take While Working On/operating Electrical Appliances Q. What precaution every house holder should take while working on/operating electrical appliances ? Get checked the house wiring, fitting by qualified electrician periodically once in a year. From the electrician get checked : Soundness of insulation of wiring work. (i) Soundness of earthing. … Read more
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
Procedure of Alignment of Shaft of Electrical Machine Q. Explain the procedure to be followed in aligned two shafts to be Directly coupled and Indirectly coupled OR Explain the procedure for levelling and alignment of electrical machine. Figure A OR Explain procedure of alignment of shaft of electrical machine. The alignment of direct – coupled … 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
Effect of Unequal Voltages and Change in Input to Prime Mover on Parallel Operation and Load Sharing of Alternators Q. What is the effect of unequal voltages and change in input to prime mover on parallel operation and load sharing of alternators. Effect of Inequality of EMF / Unequal Voltage : In a perfect synchronization … 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
Benefits and applications of VFD Q. Benefits of VFD and applications of VFD Benefits of VFD Following are the benefits of VFD : Energy saving. Less cost. Smooth starting. Better process control. Less maintenance. Improves p.f. Bearings, motor’s life is large. Improved power quality. Applications of VFD Following are the applications of VFD : For … Read more