B voltage c insulation 78 explain the stress produced

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(b) Voltage. (c) Insulation. 7.8 Explain the stress produced due to tangential forces due to dielectric stress. 7.9 Explain the causes of formation of voids in cables. 7.10 Explain the methods of laying the under ground cables. 7.11 Explain jointing methods for underground cables. 8. CONCEPT OF AC DISTRIBUTOR LOADS WITH THE HELP OF VECTOR DIAGRAMS AND ITS CALCULATIONS. 8.1 Draw the Vector Diagrams of AC distributor loads. 8.2 Calculations on Voltage drop in AC distributors. 8.3 Define, Calculate the Voltage Regulation for AC Distributors. 8.4 Solve the Numerical examples of a power loss in AC Distributors. 9. UNDERSTAND THE NEED AND WORKING OF BALANCER AND BOOSTERS. 9.1 Define the Balancer. 9.2 Define the booster. 9.3 Explain the uses of Balancer. 9.4 Explain the uses of Boosters. 9.5 Solve simple problems of D.C balancer. 9.6 Discuss the working of Boosting transformer. 10. UNDERSTAND THE TYPES, COMPONENTS AND SYSTEMS OF SUB-STATIONS. 10.1 Explain the types of substations, (a) Step up substation, (b) Primary Grid substation, (c) Secondary substation, (d) Distributor substations. 10.2 Explain the merits of indoor and out door substations. 10.3 Enlist the equipment installed at a substation. 10.4 Explain the necessity of various Bus Bar arrangements. (a) Single Bus Bar. (b) Double Bus Bar. (c) Sectionizing Bus Bar. (d) Bus Bar coupler.
183 10.5 Describe the necessity of single C.B, one & half C.B. and double C.B-scheme. 10.6 Explain the necessity of neutral Point grounding. 10.7 Select the suitable grounding method for given system: (a) Solid Grounding. (b) Resistance Grounding. (c) Reactance Grounding. 10.8 Explain advantages of neutral grounding. 10.9 Explain the advantages of interconnected power stations. 10.10 Draw the line diagram of Pakistan National Grid System of 500 KV, 220 KV, 132 KV. UNIT-3 SWITCH GEAR: 11. UNDERSTAND SHORT CIRCUIT FAULT CONSIDERATIONS IN THE POWER SYSTEMS. 11.1 Draw the single line diagram of power system. 11.2 Write the formula of percentage reactance and percentage reactance at base KVA. 11.3 Solve the short circuit KVA at symmetrical fault (Simple Problems). 11.4 Solve the short circuit capacity of a Alternator in a system (Simple Problems). 12. UNDERSTAND THE NEEDS, TYPES AND LOCATIONS OF REACTORS. 12.1 Explain the necessity of reactors. 12.2 Explain the type of reactors from constructional point of view. 12.3 Propose the location of reactors in a system (Feeder, Bus Bar, Generator). 12.4 Point out the advantages & disadvantages of reactors. 12.5 Draw a diagram showing the reactor in a ring system, Tie-Bar system. 13. UNDERSTAND THE TYPES, CONSTRUCTION AND WORKING OF CIRCUIT BREAKERS. 13.1 Explain the theory of A.C Arc Interruption. 13.2 State the arc phenomena. 13.3 Enlist type of circuit breakers. 13.4 Explain working and construction of oil circuit breaker. 13.5 Discuss advantages and disadvantages of O.C.B. 13.6 Enlist the types of O.C.B, also discuss the comparison between each case.

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