A 17.Gs 2 resistance is connected to the secondary winding of a single phase 115 V/230 V transformer with the equivalent circuit parameters shown in Table Q3b. (b) Using this information determine the following: (i) The transformer turns ratio. (ii) The output voltage and output power (W) under load. (iii) The regulation and efficiency under load. (iv) The required load to operate at maximum efficiency.
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- In developing per-unit circuits of systems such as the one shown in Figure 3.10. when moving across a transformer, the voltage base is changed in proportion to the transformer voltage ratings. (a) True (b) FalseWhy is it important to reduce the moisture within a transformer to acceptable levels during transformer installation?A single-phase l0-kVA,2300/230-volt,60-Hz two-winding distribution transformer is connected as an autotransformer to step up the voltage from 2300 to 2530 volts (a) Draw a schematic diagram of this arrangement, showing all voltages and currents when delivering full load at rated voltage. (b) Find the permissible kVA rating of the autotransformer if the winding currents and voltages are not to exceed the rated values as a two-winding transformer. How much of this kVA rating is transformed by magnetic induction? (C) The following data are obtained from tests carried out on the transformer when it is connected as a two-winding transformer: Open-circuit test with the low-voltage terminals excited: Applied voltage =230V, input current =0.45A, input power =70W. Short-circuit test with the high-voltage terminals excited: Applied voltage =120, input current =4.5A, input power =240W. Based on the data, compute the efficiency of the autotransformer corresponding to full load, rated voltage, and 0.8 power factor lagging. Comment on why the efficiency is higher as an autotransformer than as a two-winding transformer.
- A transformer core is laminated in order to ....................................? (A) reduce hysteresis loss and eddy current loss (B) reduce only hysteresis loss (C) reduce copper loss (D) reduce all of the above losses (E) None of the above.BListen Tron Joss in a transformer: Cais dependent on load current. b) is a function of the resistance of the primary and the secondary windings. Cis a function of eddy currents and hysteresis effects in the transformer core. d) ) can be reduced by ¼ by reducing the current by 2.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. phase-currents.
- 5- The emf induced in the windings of a transformer will. a)-lag the core flux by 90° b)-be in-phase with the core flux· c)- lead the core flux by 90° d)-be independent of the core flux 6- the efficiency of an autotransformer for the same output compared to a two-winding transformer is a) Greater , b) Lesser c) Poor d) None of these 7- The full-load efficiency of a transformer at 0.85 p.f. lag is 97 per cent. Its efficiency at full load 0.85 power factor lead will be (a) 99% (b) 96% (c) 97% (d) 98% 8- At 50HZ operation a single phase transformer has hysteresis loss of 200W and eddy current loss of 100 W ,Its core loss at 60HZ operation will be 432W b) 408W c) 384W d) 360W1.a. For performing dielectric-strength tests on insulating materials, two transformers are connected in aA. parallel combination.B. cascade arrangement.C. polyphase arrangement. 1.b. In large power transformers, the unequal voltage distribution caused by voltage surges in the winding isprevented by the use ofA. static shields.B. series capacitors.c. low-voltage arresters.Fast A transformer has 600 primary turns and 150 secondary turns. The primary and secondary resistances are 0.25 ohm, and 0.01 ohm, respectively and the corresponding leakage reactances are 1.0 ohm and 0.04 ohm, respectively. Determine (a) the equivalent resistance referred to the primary winding, (b) the equivalent reactance referred to the primary winding, (c) the equivalent impedance referred to the primary winding, and (d) the phase angle of the impedance.
- In the single-phase, three- winding, transformer, the primary current is equal to lo at the condition of ints there is no load on tertiary windings the current in secondary windings equal to zero the resistances (R1, R2, and R3) in transformer windings are equal the inductances (L1, L2, and L3) in transformer windings are equal.calculate the iron loss P; and copper loss Peu of each transformer for full load condition.Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no-load voltages in the primary and secondary circuit are 200 and 400 volts, respectively, and at a frequency of 50 Hz. The primary no-load current at a voltage of 200 volts is 0.7 amps and the losses in the core are 70 watts. The resistance and reactance of the primary are 3.2 and 1.25 ohms, respectively. Secondary resistance and reactance 6.0, 0.07 ohms, respectively. Draw the equivalent circle, showing the values of its elements.