CERTIFICATE OF COMPETENCY IN POWER DISTRIBUTION (CCPD) Term-End Examination June, 2012

Transcription

1 No. of Printed Pages : 12 OEE-002 CO CD O CERTIFICATE OF COMPETENCY IN POWER DISTRIBUTION (CCPD) Term-End Examination June, 2012 OEE-002 : POWER DISTRIBUTION SYSTEM - BASICS Time : 3 hours Maximum Marks : 70 Note : This paper has two sections, Section-A and Section-B. Both the sections are compulsory. Remarks have been mentioned in the section along with marks. Your answer should be in English or Hindi only. SECTION - A 1. Fill in the blanks. Choose correct answers from the choices given below : 15x1=15 (Maintenance, Interlock, Dog, Risers, Spacers, Gases, Preventive, Foam, Conductor, Humidity, Frequency, Survey, Tough, Cross arms, Air) (a) Due to fault inside the transformer, may be formed. (b) An is provided between isolator and earth switch. (c) (d) represents around 40% of the installed cost of the line. is the trade name of conductor. OEE P.T.O.

2 (e) (f) The basic grounding system is in the form of earthmat with maintenance should be carried out for detecting deterioration of system components. (g) Quality of SF6 gas is checked by its content. (h) For oil five type extinguishers are used. (i) are provide to overcome the problem of clashing of LT conductors in the mid span. (j) Earthing switches are provided at various locations to facilitate (k) ABT is dependent. (1) Dry type transformers are cooled. (m) Disc insulators may be made of glass. (n) are provided in a pole to provide mechanical support to multiple conductors. (o) Before installation of line needs to be carried out. 2. Write True (V) or False ( x) for the statement given below : 1x10=10 (a) Transformer is a static device. (b) Resistance of Transformer winding is very high. (c) Isolators can't be operated unless the corresponding breaker is in closed position. OEE-002 2

3 (d) (e) (f) (g) (h) (i) (j) Electricity is often generated at 11 KV by electrical generators. Single phase meters are being used for agricultural customers. Purified water with low resistance value is used for live line washing. LBB protection is used in distribution transformer. The faults on HT lines are far less than compared to LT lines. Energy consumed is typically measured in WH. Concrete poles are more expensive than wood poles. 3. Match the following given in column 'A' with, column 'B'. 5x1=5 Column 'A' Column 'B' (a) Breather (i) Relay (b) Diversity Factor (ii) Load (c) Multiplying Factor (iii) Sag (d) CT (iv) Silica gel (e) Conductor (v) Energy Meter OEE P.T.O.

4 SECTION - B Answer any eight (8) questions. 8x5=40 4. List important reasons for DTR failures. 5. What is the difference between Power Cable and Central Cable? 6. What is the procedure for permit to work? 7. Write a brief note on Hot Line Maintenance. 8. What do you understand by transmission grid? 9. What role does insulator play in electric power system? 10. How does higher voltage reduce electric power losses? 11. Discuss the legal provisions as per Electricity Act, 2003 for dealing with theft of energy. 12. Describe about Ring Main System. 13. Write a brief note on -Buchhloz relay. OEE-002 4

5 14. What precautions should be taken for storage of cables? 15. Why Reactive Compensation is needed in distribution system? How is it provided? OEE P.T.O.

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