IV B.Tech I Semester Examinations,MAY 2011 ELECTRICAL DISTRIBUTION SYSTEMS Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. Give the various loading and voltage level factors that influence the design and operation of primary feeder. [16]
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2. Compare the four and six feeder patterns of substation service area if they are voltage drop limited. [16] 3. (a) Explain the salient points in general co-ordination procedure. (b) Explain Fuse-Circuit breaker coordination.
[8+8]
(a) Off - peak load is zero (b) Load is steady
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(c) Very short lasting peak.
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4. Derive the relationship between load factor and loss factor for the following load conditions:
[16]
5. A single phase radial network is shown in fig. 7. The resistance and reactance of each wire is 0.2 ohms and 0.3 ohms per meter respectively. The receiving end voltage is 2206 00 V. Then calculate: (a) The voltage drop of each section of the line (b) Total voltage drop of the line
[16]
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(c) Total real power and real power and reactive power of the line.
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6. A single phase 3 wire distribution line 120 V - 0 - 120 V, feeds a load of 10 KVA line to line and 3 KVA on each line to ground. The transformer is 7620V/240V 25KVA with 5% impedance. The line impedance is j0.05 ohm per wire. Calculate the fault current and fault MVA for: (a) L-L fault 1km from the transformer
(b) L-G fault 1km from the transformer.
[8+8]
7. A 37.3KW induction motor has a p.f 0.9 and efficiency 0.9 at full load , power factor 0.6 and efficiency 0.7 at half load. At no load, the current is 25% of the full load current and p.f 0.1. capacitors are supplied to make the line power factor 0.8 at half load. With these capacitors in circuit , Find the line power factor at : (a) Full load and
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Code No: 07A70208
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Set No. 2
(b) no load.
[8+8]
8. (a) Explain the basic functions of booster transformer and how it increases the line voltage. (b) Describe the operation of AVR/AVB with neat diagram.
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[8+8]
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Set No. 4
1. (a) Derive the expressions for volt drop and power loss in lines.
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IV B.Tech I Semester Examinations,MAY 2011 ELECTRICAL DISTRIBUTION SYSTEMS Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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(b) Explain the manual method of solution for radial distribution systems. [8+8] 2. (a) Compare and explain the role of shunt and series capacitors in P.F. correction.
i. star connected ii. delta connected.
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(b) A 440V, 50 cycles three phase line delivers 200KW at 0.6p.f. (lag). It is desired to bring the line p.f. to unity by installing shunt capacitors. Calculate the capacitance if they are:
[10+6]
3. (a) For what contribution factor, the coincident factor is equal to contribution factor. Also define contribution and coincident factor
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(b) The annual peak load of substation is 3500kW. The annual energy supplied to the primary feeder circuit is 20×106 kWh. Find: i. The annual average power demand ii. The annual load factor.
[8+8]
4. (a) Explain Fuse-Fuse coordination.
(b) Explain Recloser -Recloser coordination.
[8+8]
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5. Explain different types of over current protective devices with neat diagrams? [16] 6. (a) Define:
Voltage Regulation Voltage drop Nominal voltage Rated voltage
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i. ii. iii. iv.
(b) Explain about step type regulators.
[8+8]
7. (a) Assume that the service area pf a given feeder is increasing as a result of new residential developments. Determine the new load and area that can be served with the same percent voltage drop if the new feeder voltage level is increased to 34.5 kV from the previous voltage level of 12.47kV. (b) Discuss in detail the factors which influence the selection of primary feeder rating. [8+8] 3
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8. (a) A 3 - Φ, 4.16kV wye grounded feeder main has 4 copper conductors with an equivalent spacing of 1.0 m between phase conductors and a lagging load power factor of 0.9. Determine the ‘k’ constant of the main feeder. Let r = 1.503Ω/m and x=0.7456 Ω/m. Also calculate the percent voltage drop in the main if a lumped sum load of 500 kVA with a lagging p.f. of 0.9 is connected at the end of 1m long feeder main. [8+8]
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(b) List out the benefits obtained from optimal location of substations.
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Code No: 07A70208
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Set No. 1
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IV B.Tech I Semester Examinations,MAY 2011 ELECTRICAL DISTRIBUTION SYSTEMS Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain power capacitors?
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(b) What is the justification for power factor improve and what are the benefits. [8+8]
Voltage Regulation Voltage drop Nominal voltage Rated voltage Utilization voltage Maximum voltage Minimum voltage Voltage spread.
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i. ii. iii. iv. v. vi. vii. viii.
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2. (a) Define:
(b) Describe different types of equipment for voltage control with neat diagrams. [8+8] 3. (a) Give the classification of loads and draw their characteristics.
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(b) A load of 100 kW is connected at the riverside substation. The 15 min. weekly maximum demand is given by 75 kW and the weekly energy consumption is 4200kWh. Find the demand factor, the 15 min. weekly load factor of the substation and its associate loss factor. [8+8] 4. (a) What are the objectives of Distribution system protection. (b) What is the data required for selecting a protective device.
[8+8]
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5. (a) Classify different types of primary feeders and give their merits and demerits. (b) Explain basic design practice of secondary distribution system and also discuss about secondary banking. [6+10]
6. (a) Give detailed analysis of three phase balanced primary lines (b) Consider a balanced 3 phase circuit having Vs and Vr are the sending and receiving end voltages respectively. R+jX is the total impedance of lines and I is the total current passing through the circuit. Find the load power factor for which the voltage drop is maximum? [8+8]
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(c) Define ‘k’ constant and give its importance.
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Figure 7a (b) Explain the rules to be considered to locate the substation.
8. Explain different types of coordination of protective devices.
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7. (a) Calculate the % voltage drop in the main if load 500kVA is uniformly distributed along the feeder main, is shown in figure 7a Consider k = 0.01%VD/(kVA.mi).
[6+6+4] [16]
Code No: 07A70208
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Set No. 3
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IV B.Tech I Semester Examinations,MAY 2011 ELECTRICAL DISTRIBUTION SYSTEMS Electrical And Electronics Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
Voltage Regulation Voltage drop Nominal voltage Rated voltage Utilization voltage Maximum voltage Minimum voltage.
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i. ii. iii. iv. v. vi. vii.
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1. (a) Define:
(b) Explain the line drop compensation on voltage control.
3. Discuss the following factors of the distribution system: (a) Demand factor (b) Plant factor (c) Load factor
(d) Diversity factor
(e) Contribution factor
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(f) Coincident factor
(g) Loss factor.
[16]
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4. (a) Derive the expression for voltage drop and power loss for non-three phase system. (b) Show that power loss due to load currents in the conductors of equivalent three phase lateral is approximately 1/1.64 times the two phase 3 wire lateral with multigrounded neutral. [8+8]
5. (a) Explain the procedure to fix the rating of a substation. (b) Calculate the percent voltage drop in the main of given 3 - phase feeder of 4.16 kV having r = 1/3 ohms/mi, x = 0.8 ohms/mi and 560 kVA load is uniformly distributed along the feeder main of length 1 mile. Assume p.f. = 0.92. [8+8] 6. Describe the principle of operation and applications of the following: 7
Code No: 07A70208
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Set No. 3
(a) fuses (b) Circuit breakers .
[8+8]
7. (a) Draw and explain one line diagram of typical primary distribution feeder.
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(b) Draw and explain one line diagram of secondary network of the distribution feeder. [8+8] 8. (a) Explain how reduction in line current and hence power losses is obtained with p.f improvement.
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(b) A 3-phase,50Hz, 2200V induction motor develops 400H.P at a power factor 0.8lag and efficiency 90% .The power factor is to be raised to unity by connecting a bank of condensers in delta across supply mains. If each of the capacitance unit built up of 4 similar 550V condensers, calculate the required capacitance of each condenser and its KVA rating. [8+8]
(a) Off - peak load is zero ... load current and p.f 0.1. capacitors are supplied to make the line power factor ... (b) The annual peak load of substation is 3500kW.
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Computer Science And Engineering · Time: 3 hours · Max Marks: 80 · Answer any FIVE Questions · All Questions carry equal marks · ***** · 1. (a) Distinguish between a packet-filtering router and a stateful inspection firewall? (b) âOne way to secure
1. With the help of a neat diagram indicating the various geometric elements of a · traffic rotary ... sight distance. What is the need to have SSD and factors.
2. Explain the alpha, delta, theta and beta waves emerging from the brain. [16] · 3. (a) Explain in detail on the isolation amplifiers used in medical field and its need ... Discuss the generation and propagation of action potential in a cell. [16] ·
(a) Steam pressure in a reactor heating coil. (b) Flow rate of reactants into a polymerization tank. (c) Flow of effluent from a waste water treatment holding tank into a river. (d) Flow of cooling water to a distillation condenser. [16] · 6. (a) Def
(a) State Newton's law of viscosity and give any four examples of its applications. (b) An oil of viscosity 8 poise is used for lubrication between a shaft and sleeve.
Set No. 2. (a) Construct a systematic (15,2) code using the generator polynomial .... taken. The bit rate is 'rb' and the channel noise has a PSD Gn(f) given by.
Discuss the principle of measuring the hardness of Heat Affected Zone using Jominey · hardenability test? .... (b) What is post weld heat treatment? Describe the ...
(a) State Darcy's law. Discuss the assumptions and limitations. .... 1. (a) State Stoke's law and explain its limitations as applicable to the sedimentation · analysis.
[4+4+4+4] · 4. Add a new method in the base class of Shapes.java that prints a message, but don't .... (d) Dynamic binding and message passing. [4+4+4+4].
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Calculate the depth of indentation produced on a glass surface in ultrasonic ma- · chining by the throwing action of abrasive grain of 100 µm diameter.
