Download PTU M.Tech. EE 2nd Semester 38814 EHVAC TRANSMISSION Question Paper

Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 2nd Semester 38814 EHVAC TRANSMISSION Question Paper.

1 | M-38814 (S9)-1266

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech.(Power System) (E-I) (Sem.?2)
EHVAC TRANSMISSION
Subject Code : PEE-514
M.Code : 38814
Time : 3 Hrs. Max. Marks : 100

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

Q1 What are the various configurations of tower? Explain with neat diagrams and compare
them from the point of view of applications with reasoning. (20)
Q2 (a) Derive the expressing determining the thermal rating of EHVAC Line transmission?
(10)
(b) Explain the importance of current carrying capacity and temperature rise in conductor
for design of line. (10)
Q3 (a) Discuss the method of line of charge and their properties. (10)
(b) Derive the formula based on voltage gradient for corona loss. (10)
Q4 (a) Derive expression for capacitance of long objects under transmission lines. (10)
(b) Discuss the electrostatic effect due to 3 phase single and double circuit EHV AC Lines.
(10)
Q5 Compute the rms values of ground level electrostatic field of a 400KV line at its maximum
operating voltage of 420KV (L-L) given in the following details :
Single circuit horizontal configuration H = 13 m, S = 12m, Conductor 2 ? 3.18cm,
B = 45.72cm. Vary the horizontal distance along ground from the line centre from 0 to
3H = 39H. (20)
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1 | M-38814 (S9)-1266

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech.(Power System) (E-I) (Sem.?2)
EHVAC TRANSMISSION
Subject Code : PEE-514
M.Code : 38814
Time : 3 Hrs. Max. Marks : 100

INSTRUCTIONS TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

Q1 What are the various configurations of tower? Explain with neat diagrams and compare
them from the point of view of applications with reasoning. (20)
Q2 (a) Derive the expressing determining the thermal rating of EHVAC Line transmission?
(10)
(b) Explain the importance of current carrying capacity and temperature rise in conductor
for design of line. (10)
Q3 (a) Discuss the method of line of charge and their properties. (10)
(b) Derive the formula based on voltage gradient for corona loss. (10)
Q4 (a) Derive expression for capacitance of long objects under transmission lines. (10)
(b) Discuss the electrostatic effect due to 3 phase single and double circuit EHV AC Lines.
(10)
Q5 Compute the rms values of ground level electrostatic field of a 400KV line at its maximum
operating voltage of 420KV (L-L) given in the following details :
Single circuit horizontal configuration H = 13 m, S = 12m, Conductor 2 ? 3.18cm,
B = 45.72cm. Vary the horizontal distance along ground from the line centre from 0 to
3H = 39H. (20)
2 | M-38814 (S9)-1266

Q6 (a) Explain the lightening arresters and protective characteristics in details. (10)
(b) A 750KV bushing is protected by gaps, which withstand 2PO power frequency
voltages. Determine their 50% flash over value under 50Hz, lightening impulse voltage
if :
(i) Rod plane gap is used and
(ii) Rod-rod gap is wed. (10)
Q7 What are the criteria for designing EHV lines based on steady state limits and other
parameter. (20)
Q8 (a) Surge Arrester (5)
(b) Transient over voltage in EHV AC (5)
(c) Radio Interference (5)
(d) EHV AC Circuit Breakers. (5)







NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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