Deepakkumar Yadav
Mechanical Forces on Transformer To overcome the problems of mechanical forces, circular coils should be used for the windings, as they can with stand the radial forces (in circular coils radial forces are cancelled by each other). Wherever it is not possible to use the circular coils, (e.g. shell type transformer) they should be braced … Read more
Comparison of Power Transformer and Distribution Transformer Q. Compare power transformer with distribution transformer Sr. No. Power Transformer Distribution Transformer 1 The rating of power transformer is very high (in MV As). The rating is in KVA and small. 2 This are used at generating stations is very high voltage transmission line and at receiving … Read more
Lightening impulse test : (This is a type test) Q. Describe the impulse voltage withstand test on transformers. 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 a special type of generator known as impulse … Read more
Induced over-voltage withstand test This test is routine test i.e. it is carried on all the transformers. 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 winding … Read more
FUSE In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current. It is a sacrificial device; once a fuse … Read more
Separate source voltage withstand test of Transformer (Power frequency) Q. Explain with neat sketch power frequency high voltage test on 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 … Read more
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