Fundamentals of Electromagnetics with Engineering Applications
1st Edition
ISBN: 9780470105757
Author: Stuart M. Wentworth
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 4, Problem 4.12P
Sometimes a transformer is used as an impedance converter, where impedance is given by v/i. Find an expression for the impedance
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Chapter 4 Solutions
Fundamentals of Electromagnetics with Engineering Applications
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- Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.arrow_forwardThe EMF equation of transformer referring to primary turns is Select one: O a. 4.440N,B O b. 4.440 fN. mi OC. 4.440 N,A O d. 4.440 fN,arrow_forwardThe primary of a certain transformer takes 1 A at a power factor of 0.4 when connected across a 230 V, 50 Hz supply and the secondary is on open circuit. The number of turns on the primary is twice that on the secondary. A load taking 50 A at a lagging power factor of 0.8 is now connected across the secondary. Sketch, and explain briefly, the phasor diagram for this condition, neglecting voltage drops in the transformer. What is now the value of the primary current?arrow_forward
- The primary side reduced load impedance of the transformer given in the figure is (TR = ideal)arrow_forwardThe primary ofa certain transformer takes 1 A at a power factor of 0.4 when connected across a 230 V, 50 Hz supply and the secondary is on open circuit. The number of turns on the primary is twice that on the secondary. A load taking 50 A at a lagging power factor of 0.8 is now connected across the secondary. Sketch, and explain briefly, the phasor diagram for this condition, neglecting voltage drops in the transformer. What is now the value of the primary current?arrow_forwardThe resistance and reactance of the primary winding of a 440/110 V single phase transformer are 4.4 ohm and 8 ohm respectively. The resistance and reactance of the secondary winding are 1.6 ohm and 2ohm respectively. Then find the equivalent resistance, reactance and impedance referred to the primary side.arrow_forward
- 4.20 A 25-KVA, 2200/220-V, single-phase transformer has an equivalent series impedance of Zel = 3.5+ j4.0 referred to the primary side. The transformer is connected to a load whose power factor varies. The core loss is 160 W. a. Calculate the voltage regulation at full load, 0.8 PF lagging. b. Determine the highest value of voltage regulation for full-load output at rated secondary terminal voltage. c. Determine the efficiency when the transformer delivers full-load output at rated secondary voltage and 0.8 power factor lagging.arrow_forwardA transformer is needed that will cause an appear as 240 Vyms. actual load resista nce of 252 to 100R to an ac voltage source of ca) Dyews the diaggaam of the cuf. reguired. cb) what tuons ratio is required for the tounsforma. C) Find the currenttauen from the source the cuorent flowing through the load, and the load voltope load voltage-arrow_forwardThe impedance ZL in the circuit shown in Figure is adjusted for maximumaverage power transfer to itself.(a) What should be the value of ZL?(b) What is the maximum average power delivered to ZL?(c) What percentage of the average power delivered to the linear transformer is delivered to ZL?arrow_forward
- 4.26 A single-phase load is supplied through a 34.5-kV feeder and a 34.5/2.4-kV transformer. The feeder has an impedance of 50 +j180 ohms, and the transformer has an equivalent impedance of 24 +j120 ohms referred to its high-voltage side. The load takes 260 kW at 2.3 kV and 0.866 lagging power factor. a. Find the voltage at the primary side of the transformer. b. Determine the voltage at the sending end of the feeder. c. Calculate the real and reactive power input at the sending end of the feeder.arrow_forward4. Would you parallel a delta-delta (A - A) 3-phase transformer bank with a delta-wye (A - Y) bank, assuming their output and input terminal voltages are equal? Justify your answer by superimposing their separate vector diagrams. (Hint solve the short circuit current at the secondary for %Z = 5%) Ans. Isc=518% of secondary currentarrow_forwardCan you help me set up equation to find this, I dont need solved just how to set up for a toroid transformer, I have already found Reluctance. The flux linking of winding 2 if the current in the winding 1 is -4 A, and the current in winding 2 is 2 AIgnore leakage inductance. Please help...arrow_forward
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