hw12 - Comment the short circuit impedance is important for...

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EE321 Spring 2008 Homework 12 For this homework, consider a transformer. The primary side resistance and leakage inductance are 2 Ω and 1 mH, respectively. The magnetizing inductance is 100 mH. The (referred) secondary resistance and leakage inductance are 3 Ω and 0.5 mH. The primary to secondary turns ratio is 10. Problem 51 – Open Circuit Impedance At 60 Hz, what is the magnitude and phase of the impedance looking into the primary winding of the transformer if the secondary winding is open-circuited ? Comment – the open circuit impedance is important performance metric because it can be used to calculate the current draw of the unloaded transformer. In a perfect world, this would be zero. Problem 52 – Short Circuit Impedance At 60 Hz, what is the magnitude and phase of the impedance looking into the primary winding of the transformer if the secondary winding is short-circuited ?
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Unformatted text preview: Comment the short circuit impedance is important for identifying the transformer parameters. Problem 53 Short Circuit Impedance At 60 Hz , w hat is the magnitude and phase of the impedance that would be measured at the input to the secondary winding if the primary winding was short-circuited ? Problem 54 Loaded Transformer A 15 resistance is placed on the secondary of the transformer. The primary voltage is 100 V rms at an angle of zero and is at 60 Hz. In the steady state, at t=5 s, what is the instantaneous voltage across and current into the 15 Ohm resistor ? Problem 55 Transformer Frequency Response Plot the ratio of the magnitude of the referred secondary voltage to the primary voltage as the frequency is varied from 0.1 Hz to 10 kHz. Use a semi-log scale and assume that the secondary is loaded with a 15 resistor as in problem 54....
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This note was uploaded on 09/22/2011 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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