Download JNTUK M-Tech 2020 R19 EEE EHV AC Transmission Model Question Paper

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I M. Tech I Semester (R19) Regular Examinations

EHVAC TRANSMISSION

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(ELECTRICAL & ELECTRONICS ENGINEERING)

MODEL QUESTION PAPER

TIME: 3 Hrs. Max. Marks: 75

Answer ONE Question from EACH UNIT

All questions carry equal marks

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UNIT -1

1. a). Explain the power handling capability and line losses in EHV lines and discuss the useful conclusions from it.
   b). Derive the expression for inductance of a Multi conductor line used in EHV AC transmission line

OR

1. a). Explain different mechanical considerations that are taken in to account for transmission line performance.
   

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   b). Write down the procedure for diagonalization of Inductance matrix
   L = [L_aa L_ab L_ac; L_ba L_bb L_bc; L_ca L_cb L_cc] of a transposed line.

UNIT - II

1. a). What are the effects of high electrostatic fields on biological organisms and human beings?
   b). Starting from the fundamentals derive the expression for potential relations for multi conductor lines.

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OR

1. a). Explain surface voltage gradient on conductors in a bundle.
   b). Derive the expression for voltage (charge voltage relation) of two conductor line.

UNIT - III

1. a). List the different corona loss - formulae and explain each one.
   

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   b). Explain the generation and measurement of audio noise due to corona in EHV lines.

OR

1. a). Explain in detail the measurement of Audible Noise.
   b). The field strength on the surface of a sphere of 1 cm radius is equal to the corona inception gradient in air of 30 KV/cm. Find the charge on the sphere.

UNIT - IV

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1. a). Explain cascade connection of components in shunt and series compensation.
   b). Explain the voltage control using synchronous condenser.

OR

1. a). Explain the sub synchronous resonance in a series capacitor.
   b). Compare series and shunt compensation for EHV AC transmission.

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UNIT - V

1. a). Explain in detail about the SVC schemes.
   b). Explain how the harmonics are injected in to network by TCR.

OR

1. a). Design a filter for suppressing harmonics injected in to the system.
   

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   b). A 100MVA 230KV 50Hz transformer has x_t = 12% and is connected to a line 200km long which has an inductance of 1mH/km. The filter, connected to the L.V. 33kv side of the transformer, is required to suppress the 5^th harmonic generated by the TCR to 1% of I_L. Calculate the value of filter capacitor if the filter inductance used in 2mH.

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