Exam Details
| Subject | power system analysis and simulation | |
| Paper | ||
| Exam / Course | pddc | |
| Department | ||
| Organization | Gujarat Technological University | |
| Position | ||
| Exam Date | May, 2017 | |
| City, State | gujarat, ahmedabad |
Question Paper
1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-IV EXAMINATION SUMMER 2017
Subject Code: X40903 Date:31/05/2017
Subject Name: Power System Analysis and Simulation
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
Classify the transmission line Derive equation of generalized constants for Medium transmission line using T methods
07
Define per unit system also explain advantage of per unit system
07
Q.2
Explain construction of synchronous machine. Also explain armature reaction in synchronous machine
07
Write a short note on receiving end power circle diagram.
07
OR
A 220 KV ,50 Hz,three -phase transmission line is 50 km long. The resistance per phase is 0.15 Ω/km. the inductance per phase is 1.33 mH/km and the shunt capacitance is negligible . Use the short line model to determine the voltage and power at the sending end voltage regulation and efficiency when the line is supplying a three -phase load of 400 MVA ,220 KV at 0.8 p.f.lagging.
07
Q.3
Draw the waveforms for fault current for a 3-phase fault on alternator terminals. Explain the sub-transient, transient and steady state reactance
07
Explain synthesis of Unsymmetrical phasors from their symmetrical components
07
OR
Q.3
Write a short note on the selection of circuit breaker
07
Explain the zero sequence impedance of transformer for various connections.
07
Q.4
Explain how fault current can be calculated when L-G fault occur through a fault impedance Zf.
07
Explain resonant grounding
07
OR
Q.4
Mention the steps to find the fault current with LL fault in a power system
07
Explain need of neutral grounding also explain resistance grounding
07
Q.5
Write a short note on Corona and the factors affecting it.
07
Discuss the transients on a series R-L circuit when subjected to a sudden three
phase short circuit
07
OR
Q.5
Write a short note on autotransformer
07
Explain following related to corona
critical disruptive voltage radio interference
07
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-IV EXAMINATION SUMMER 2017
Subject Code: X40903 Date:31/05/2017
Subject Name: Power System Analysis and Simulation
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
Classify the transmission line Derive equation of generalized constants for Medium transmission line using T methods
07
Define per unit system also explain advantage of per unit system
07
Q.2
Explain construction of synchronous machine. Also explain armature reaction in synchronous machine
07
Write a short note on receiving end power circle diagram.
07
OR
A 220 KV ,50 Hz,three -phase transmission line is 50 km long. The resistance per phase is 0.15 Ω/km. the inductance per phase is 1.33 mH/km and the shunt capacitance is negligible . Use the short line model to determine the voltage and power at the sending end voltage regulation and efficiency when the line is supplying a three -phase load of 400 MVA ,220 KV at 0.8 p.f.lagging.
07
Q.3
Draw the waveforms for fault current for a 3-phase fault on alternator terminals. Explain the sub-transient, transient and steady state reactance
07
Explain synthesis of Unsymmetrical phasors from their symmetrical components
07
OR
Q.3
Write a short note on the selection of circuit breaker
07
Explain the zero sequence impedance of transformer for various connections.
07
Q.4
Explain how fault current can be calculated when L-G fault occur through a fault impedance Zf.
07
Explain resonant grounding
07
OR
Q.4
Mention the steps to find the fault current with LL fault in a power system
07
Explain need of neutral grounding also explain resistance grounding
07
Q.5
Write a short note on Corona and the factors affecting it.
07
Discuss the transients on a series R-L circuit when subjected to a sudden three
phase short circuit
07
OR
Q.5
Write a short note on autotransformer
07
Explain following related to corona
critical disruptive voltage radio interference
07
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