Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem Old 170905 Advanced Power System I Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (OLD) EXAMINATION ? WINTER 2018
Subject Code: 170905 Date: 15/11/2018
Subject Name: Advanced Power System - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) For a lossless distributed parameter symmetrical line, derive the equation for the
midpoint voltage on the line in terms of wave number and surge impedance of
the line. Also draw graph for the voltage distribution, midpoint voltage Vm and
load angle ?.
07
(b) Draw schematic diagram of 12-pulse converter. With the help of transformer line
side current waveforms, explain how the Y-Y and Y- ? arrangement of the
secondaries of two transformers helps in reducing harmonics in the line current.
07
Q.2 (a) Draw the schematic arrangement of single phase TCR and explain its working.
Draw the waveforms of TCR current, TCR voltage and Reactor voltage for TCR
firing angle of 105 ?.
07
(b) With appropriate schematic arrangements of FC-TCR, draw and explain FC-
TCR operating characteristics without and with a coupling transformer.
07
OR
(b) In HVDC control, explain Individual Phase Control system and explain the
following approaches for this system:
a) Cosine control of phase delay b) Linear control of phase delay
07
Q.3 (a) With necessary diagrams and equations, discuss the effect of shunt and series
compensation on power-transmission capacity of a transmission line.
07
(b) Explain in detail, advantages of HVDC transmission system over EHVAC
transmission system.
07
OR
Q.3 (a) Enlist various conventional control mechanisms in power system. Explain the
concept and operation of phase shifting transformer with its schematic diagram
and phasor diagram.
07
(b) Draw the schematic arrangement of HVDC voltage source converter and explain
its working.
07
Q.4 (a) Explain with suitable figures, the conduction sequence in 6-pulse converter
configuration.
07
(b) Draw schematic layout of a complete HVDC transmission system. For this
schematic, explain: a) smoothing reactor, b) AC filter, c) Shunt capacitor d)
Converter transformer.
07
OR
Q.4 (a) Explain converter transformers and AC-DC converters as sources of harmonics
in HVDC system.
07
(b) Explain various types of HVDC systems with their schematic arrangements.
Which type of system is most widely used and why?
07
Q.5 (a) With reference to HVDC control, explain current compounding of rectifier and
inverter.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (OLD) EXAMINATION ? WINTER 2018
Subject Code: 170905 Date: 15/11/2018
Subject Name: Advanced Power System - I
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) For a lossless distributed parameter symmetrical line, derive the equation for the
midpoint voltage on the line in terms of wave number and surge impedance of
the line. Also draw graph for the voltage distribution, midpoint voltage Vm and
load angle ?.
07
(b) Draw schematic diagram of 12-pulse converter. With the help of transformer line
side current waveforms, explain how the Y-Y and Y- ? arrangement of the
secondaries of two transformers helps in reducing harmonics in the line current.
07
Q.2 (a) Draw the schematic arrangement of single phase TCR and explain its working.
Draw the waveforms of TCR current, TCR voltage and Reactor voltage for TCR
firing angle of 105 ?.
07
(b) With appropriate schematic arrangements of FC-TCR, draw and explain FC-
TCR operating characteristics without and with a coupling transformer.
07
OR
(b) In HVDC control, explain Individual Phase Control system and explain the
following approaches for this system:
a) Cosine control of phase delay b) Linear control of phase delay
07
Q.3 (a) With necessary diagrams and equations, discuss the effect of shunt and series
compensation on power-transmission capacity of a transmission line.
07
(b) Explain in detail, advantages of HVDC transmission system over EHVAC
transmission system.
07
OR
Q.3 (a) Enlist various conventional control mechanisms in power system. Explain the
concept and operation of phase shifting transformer with its schematic diagram
and phasor diagram.
07
(b) Draw the schematic arrangement of HVDC voltage source converter and explain
its working.
07
Q.4 (a) Explain with suitable figures, the conduction sequence in 6-pulse converter
configuration.
07
(b) Draw schematic layout of a complete HVDC transmission system. For this
schematic, explain: a) smoothing reactor, b) AC filter, c) Shunt capacitor d)
Converter transformer.
07
OR
Q.4 (a) Explain converter transformers and AC-DC converters as sources of harmonics
in HVDC system.
07
(b) Explain various types of HVDC systems with their schematic arrangements.
Which type of system is most widely used and why?
07
Q.5 (a) With reference to HVDC control, explain current compounding of rectifier and
inverter.
07
2
(b) Explain operating (Voltage-current) characteristics of TCR without voltage
control and with voltage control.
07
OR
Q.5 (a) Explain, with suitable output voltage waveforms, operation of six pulse converter
with commutation overlap angle ?. Briefly discuss the effect of commutation
overlap on output voltage.
07
(b) Give schematic arrangement of TSC and in it, explain the functions of series
reactor. Also draw and explain operating characteristics of TSC.
07
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This post was last modified on 20 February 2020