c. The core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V and L.V turns per phase, (ii) e.m.f per turn (iii) full load H.V and L.V turns per phase. (15 Marks)
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- Full calculation with any assumption needed. All sub questions please as it is all related.Q.4/ choose true or false: 1. The reluctance of any core is proportional directly with the length of it and inversely with both the permeability and the cross-section area of it. 2. The number of parallel paths in wave windings is equal to twice of the number of poles. 3. In dc machines with same values of Z, N, Ø, the emf for wave winding type is more than emf of lab winding type. 4. If we insert a current in such a conductor subjected to a constant magnetic field, a movement will achieved giving the principle of electric generator.The maximum flux density in the core of a 250/3000V, 50Hz single phasetransformer is 1.2 Wb/m2. If the emf per turn is 8 volt, determinea) Area of the core
- Please solve the problem i want urjentThe maximum flux density is the core of a 3000/240-V; 50Hz single phase distributiontransformer is 1.25 Tesla. If the voltage induced per turn is 8 volts, determine the crosssectional of the core in cm2The hysteresis coefficient of the core material of a power transformer is 110J/ m3. The eddy current coefficient is 132.87J/m3. The volume of the core is 0.005m3, the thickness of the iron is 0.07 m and the maximum flux density is 1.12T. If the supply frequency is 50 Hz: (a) Determine the hysteresis loss (b) Determine the eddy current loss (c) Determine the core loss of this transformer. (d) Explain how the eddy currents are generated. Suggest one method to minimise this loss. (e) Illustrate the hysteresis losses using a fully labelled hysteresis loop.
- eeffThe core of a three phase, 50 Hz, 11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb. Find (i) number of H.V. and L.V. turns per phase. (ii) e.m.f. per turn (iii) full load H.V. and L.V. phase-currents.10. In a transformer, the leakage flux of each wind- ing is proportional to the current in that winding because (a) Ohm's law applies to magnetic circuits (b) leakage paths do not saturate (c) the two windings are electrically isolated (d) mutual flux is confined to the core. 11. In a two-winding transformer, the e.m.f.per turn in secondary winding is always.........the induced e.m.f. power turn in primary. (a) equal to K times (b) equal to 1/K times (c) equal to (d) greater than. 12. In relation to a transformer, the ratio 20: 1 indi- cates that (a) there are 20 turns on primary one turn on secondary (b) secondary voltage is 1/20th of primary voltage (c) primary current is 20 times greater than the secondary current. (d) for every 20 turns on primary, there is one turn on secondary.
- a. The core of a three phase, 50 Hz,11000/550 V delta/star, 300 kVA, core-type transformer operates with a flux of 0.05 Wb.Find (i) number of H.V and L,V turns per phase, $(ii)$ e.m.f per turn (iii) full load H.V and LV turns per phase.The core of a transformer operating at 50 Hz has an eddy current loss of 100 W/m3 and the corelaminations have a thickness of 0.50 mm. The core is redesigned so as to operate with the same eddycurrent loss but at a different voltage and at a frequency of 250 Hz. Assuming that at the new voltage themaximum flux density is one-third of its original value and the resistivity of the core remains unaltered,determine the necessary new thickness of the laminations. Clear and detailed solution.A 250/125 V, five kVA single-phase transformer has a primary resistance of 0.2 ohms and reactance of 0.75 ohms. The secondary resistance is 0.05 ohm and reactance of 0.2 ohms.a) Determine its regulation while supplying full load on 0.8 leading p.f.b) The secondary terminal voltage on full load and 0.8 leading p.f.Ans.: -0.4.88%; 131.1