2- The net area requiřed for a 1500kV, 6000/400v, SOH2, single-phase core type power transformer is - assume a maximum flux density of 1.2 Wb/m and induced voltage per turn of 30V a) 8106 m ( 0.112 m2 c) 0.22 m none of the above 13
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- A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?SOLVE STEP BY STEP IN DIGITAL FORMAT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 2. A transformer with a 10/1 turns ratio has a maximum flux density of 60,000 lines/in2, when the primary winding is connected to a 2300 V power supply at 60 cps. What will be the maximum flux density if the secondary is connected to a 115 volt supply at 25 cps with the primary open?15. Primary winding of transformer is made-up of __________________________ material. a. insulated copper conductor b. Cold Rolled Grain Oriented (CRGO) conductor c. Cold Rolled Grain Oriented (CRGO) Silicon Steel d. insulated CRGO conductor
- What is phase angle of voltage induced in primary and secondary windings of transformers due to mutual flux? Same Opposite Zero None of option2. Why the core losses varying with the load?Write short notes on the following: i) Current transformers ii) Potential transformers iii)Capacitor voltage transformers
- 23. In a transformer the core loss component is 90 degrees with the flux Select one: True FalseConnect three single-phase transformers in Y-Y, with subtractive polarity, so that the line-to-line voltages on the primary are 30 degrees delayed to their respective line-to-line voltages on the secondary. It should show each step that is needed to make this connection (example: the phasor diagram) and should show the final connection of the three transformers including the polarity markings. Assume phase A on the primary is terminal "H1".Calculate the core area in Cm 2 required for a 1600kVA, 6600/440 V, 50Hz single phasetransformer. Assume maximum flux density of 1.2 Wb/m 2 and induced voltage per turn 0f30V
- Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.Match the following: (i) Hysteresis loss (a) Can be redud by constructing the core with laminated sheets of alloy steel (ii) Eddy current loss (b) Can be reduced by the use of special high grades of alloy stl as core material.The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) False