AC - Supply 380V $1 eeeee 0-400V Trans.1 Trans.2 Pr.l 14 Pr.2 3-Phase Auto Transformer 0-1A Sec.1 N N Sec.2 0-14 lamp Lamp Lamp 0-24 S2 S S 3-Phase resistive load
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- 9. A single-phase transformer has a turn ratio of 6, the resistances of the primary and secondary windings are 0.9 £2 and 0.025 2 respectively and the leakage reactances of these windings are 5.4 92 and 0.15 2 respectively. Determine the voltage to be applied to the low- voltage winding to obtain a current of 100 A in the short-circuited high voltage winding. Ignore the magnetising current.Find the following : 1.Ripple Voltage (vpp) 2. Zero-to peak ripple(Vop) 3.secondary winding of the transformer high line and low line64. The effective primary and secondary resistances of a 500 kVA, 12000/2400 volt 60 cycle transformer are 1.52 and 0.049 ohms, and the corresponding leakage reactances are 6.4 and 0.26 ohms. The no-load core loss is 1700 Watts. Determine the efficiency at rated kVA load and unity pf. a. 98.72% b. 94. 23% c. 97.43% d. 96.22%
- E 16. If a 0.6 accuracy class current transformer has a phase angle ß of + 10' at 100% rated current, the ratio correction factor is A. 1.005. B. 0.989. C. 1.007. D. 0.995. bru??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
- For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) NoFull calculation with any assumption needed. All sub questions please as it is all related.Make a conclusion regarding about the topic effect of frequency on transformer rating .
- 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?Vr 3. For a 1.2 accuracy class potential transformer used at a lagging phase angle y of 10', the RCF value is A. 0.991. B. 0.988. C. 0.977. D. 0.999. primary connection scheme that must be used withFor an AC transformer, higher is the secondary leakage1.higher is the secondary induced e.m.f2.lower is the secondary induced e.m.f3.lower is the primary induced e.m.f4.higher is the primary induced e.m.f.