STUPIDSID
Solve any one question fromQ.1(a,b) and Q.2(a,b)
1(a)
Explain in brief various incentives and penalties offered by MSEDCL to various types of consumers.
6 M
1(b)
A string of suspension insulator consists of 4 units. The capacitance between each link pin and earth is 1/10 th of the self-capacitance of a unit. The voltage between the line conductor and earth is 100 kV. Find the voltage distribution across each unit and string efficiency.
6 M
2(a)
A consumer has an annual maximum demand of 250 kW at 40% load factor. If the tariff is Rs. 100 per kW to maximum demand plus 20 paissa per kWh, then find overall cost per kWh.
6 M
2(b)
Explain n brief the necessity and working of the following equipments used in power plant:
i) Protective relays
ii) Power transformers.
i) Protective relays
ii) Power transformers.
6 M
Solve any one question fromQ3(a,b) and Q.4(a,b)
3(a)
Derive an expression for loop inductance of a single phase- two wire overhead line with conductors separated by distance 'd' meter and radius of each conductor as 'r' meter.
6 M
3(b)
Draw the cross-sectional view single core cable and explain its construction also state the properties of good insultating material.
7 M
4(a)
What is meant by transporation of conductor in an overhead line? Calcuate the inductance per phase per km of a 33 kV, 50Hz, three phase, three conductor lines with conductor spacing of 1.4 m and diameter of each conductor 1.5 cm for the following configurations:
i) Equilateral spacing
ii) Horiziontal spacing, Assume transposed lines.
i) Equilateral spacing
ii) Horiziontal spacing, Assume transposed lines.
7 M
4(b)
Derive an expression for sag of transmission line when supports are at unequal level
6 M
Solve any one question fromQ5(a,b) and Q.6(a,b)
5(a)
Derive an expression for capacitance per phase per km of three hase line when conductors are arranged in the form of equilateral triangel of sides 'd' meter.
6 M
5(b)
A 30 km long, single phase 11kV line has two parallel conductors each 45 mm in diameter and 2.5 m apart. The height of conductors above ground is 7 m. Find total capacitance and charging current of line considering effect of earth.
6 M
6(a)
Derive an expression for capacitance of single phase transmission line considering effect of earth.
6 M
6(b)
Determine capacitance per phase per km and capactive reactnce of 3 pahse, 33 kV well tranposed line operating at 50 Hz with 1.5 cm diameter conductors arranged at a distance of 1.5m assuming:
i) Equilateral triangular spacing
ii) Horizontal spacing with transposition
i) Equilateral triangular spacing
ii) Horizontal spacing with transposition
6 M
Solve any one question fromQ.7(a,b) and Q.8(a,b)
7(a)
Classify transmission lines based on voltage, length and line parameters.
7 M
7(b)
Explain effect of load power factor on regualtion and efficiency.
6 M
8(a)
Express the relationship for the sending and voltage and current in terms of receiving end voltage and current for a medium length transmission line with nominal 'T' method of representation. Draw the phasor diagram.
7 M
8(b)
A 66 kV, 3-phase, 50 Hz, 150 km long overhead transmission line is open circuted at receiving end. Each conductor has a resistance of 0.25Ω/km, an inductive reactance of 0.5Ω/km and has capacitive admittance of 0.04* 10-4 S/km.
i) Draw the nominal II equivalent circuit and indicate the value of each parameter.
ii) Calculate reciving end volatage if sending end voltage is 66 kV.
i) Draw the nominal II equivalent circuit and indicate the value of each parameter.
ii) Calculate reciving end volatage if sending end voltage is 66 kV.
6 M
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