Code No: 420256 IV B.Tech II-Semester Suppl. Examinations April/May 2004 ELECTRICAL DISTRIBUTION SYSTEMS (Electrical and Electronics Engineering) Time: 3 hours Max. Marks: 70 Answer any Five questions All questions carry equal marks --1. a) Explain the need for distribution automation. b) Discuss the motivating objectives of Distribution Automation system.
Explain how a load duration curve is plotted. What is its age? A distribution substation supplies the following loads: 15,000 kW, 8,500 kW, 6,000 kW and 450 kW. The station has a maximum demand of 22,000 kW. The annual load factor of the station is 48%. Calculate (i) the energy supplied annually (ii) the diversity factor and (iii) the demand factor
3.
Draw the one line diagram of radial type primary feeder and mention the factors that influences the selection of primary feeder.
4.
Explain the procedure for the location of a substation. Enumerate the various factors affecting the selection of site for a substation.
5. a)
Prove the power loss due to the load currents in the conductors of single-phase lateral ungrounded neutral case is 2 times large than one in the equivalent three phase lateral. Prove the power loss due to load currents in the conductors of the single-phase two-wire ungrounded lateral with full capacity neutral is 6 times larger than the one in the equivalent three phase 4-wire lateral. What are the main objectives of distribution protection? Discuss. The per unit values of positive, negative and zero sequence reactances of a network at fault are 0.08, 0.07 and 0.05 respectively. Determine the fault current if the fault is double line to ground.
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6. a) b)
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2. a) b)
Explain the effect of shunt compensation on distribution system. A 3-phase substation transformer has a name plate rating of 7250KVA and a thermal capability of 120% of the name plate rating. If the connected load is 8816KVA with a 085pf lagging p.f., determine the following: i) The KVAR rating of the shunt capacitor bank required to decrease the KVA load of the transformer to its capability level. ii) The power factor of the corrected level.
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7. a) b)
8. a) b)
Why we need to control the voltage of power system? Explain in detail. Compare and explain the role of shunt and series capacitor in voltage control. ###
420256 IV B.Tech II-Semester Suppl. Examinations ...
5. a) Prove the power loss due to the load currents in the conductors of single- ... b) A 3-phase substation transformer has a name plate rating of 7250KVA and a.
b) The annual input to a sub-transmission system is 1,75,200 MW hrs. On the peak- · load day of the year, the maximum demand is 50 MW and the energy input ...
Draw the circuit diagram of wein bridge oscillator and derive an expression ... What is the need of timing circuits in an industrial device? ... Synchronous Times.
NR. IV B.Tech I Semester Supplementary Examinations, November 2005 ... NR size is smaller than the fiber core, and the small gap between the source and.
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[8+8] · 2. Explain the mathematical interpretation of finite element method for ... (a) Show that the value of the shape function N1 of node i and node k of a simplex.
IV B.Tech I Semester Supplementary Examinations, November 2005. INTERNET & JAVA PROGRAMMING · (Electronics & Computer Engineering) · Time: 3 hours · Max Marks: 80 · Answer any FIVE Questions · All Questions carry equal marks · ***** · 1. (a) Defferet
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(a) What is Redundancy? Explain the different types of Redundancy operation with LCU. (b) explain the operation of: i. Operator interface. ii. Engineer interface.
(a) What is the â need of rounding off of capacities in estimating the probabilities of a systemâ. Explain how they are evaluated. (b) Consider that there are four ...
