Exam Details
| Subject | Power Distribution System- Basics | |
| Paper | ||
| Exam / Course | Certificate of Competency in Power Distribution (CCPD) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 12 IOEE-0021
CERTIFICATE OF COMPETENCY IN POWER
DISTRmUTION (CCPD)
Term-End Examination
June, 2016
UU438
OEE-002 POWER DISTRIBUTION SYSTEM -BASICS
Time: 3 hours. Maximum Marks: 70
Note: This paper has two sections -Section A and Section B. Both these sections are compulsory. Remarks have been mentioned in the section/question along with marks. Write your answers in English or Hindi language only.
SECTION A
1. Fill in the blanks. Choose the correct answer from the choices given below: 15xl=15
(fault, 70, moisture, aluminium, LV, vertical, three, apparent, smart card, meter, inherent, open, 250, billed, 650, isolate)
In a loop arrangement, the feeder is normally loaded to of its capacity so that in the event of breakdown it can share the load of other feeders also.
The circuit breaker is a switching device to interrupt not only the load current but also the current.
Collection efficiency is defined as amount realized to amount
Technical loss is in the systems as all the electrical devices have some resistance and flow of current causes a power loss.
The is the cash register of the utility.
65% of the failures in a distribution transformer are due to damage to coils.
A tri-vector meter is designed to record active, reactive and energy along with MD indicator on all phases.
(viii) Shackle insulators are used for distribution lines dead ending and supporting conductors laid in formation.
Pre-paid metering is a system whereby consumers purchase electricity through a .
Medium voltages are voltages above volts and up to volts.
Interlocks should be there between isolator and earthing switch so that no earthing switch can be closed unless and until corresponding isolator is in position.
Painting of metal parts of distribution transformer is done once in years to avoid corrosion.
(xiii) Muddy colour on inspection of oil sample indicates the presence of .
The substations have current and voltage transformers designed to electrically high voltage primary circuit from the low voltage secondary circuit.
In the case of AAC and AAAC conductor all the strands are of .
2. Write True or False for the statements given below: 10x1=10
In the case of ACSR conductor, the central core is of aluminium.
A breakdown of the insulation of cable, which allows current to flow from core to earth is called a ground fault.
While inspecting oil sample of a transformer green colour indicates the presence of dissolved copper compounds.
The minimum breakdown voltage rating for transformers up to 66 kV is 40 kV.
Surge arrester is a protective device for limiting surge voltages on equipment by discharging or bypassing surge current.
Shunt capacitors are connected on the primary side (33 kV) of the 33/11 kV power transformer.
Supplier measures insulation resistance of installation by Megger applying 500 volt DC for one minute and insulation resistance must not be less than one mega ohm.
(viii) 11 kV is a primary distribution voltage.
Guard wires are used at all points where a line crosses a street, road or railway line.
Electromechanical meters are extremely difficult to tamper and if somebody attempts to tamper them, it will record the information.
3. Match the following given in Column with Column 5x1=5
Column Column'B'
Pilferage Gas
Pole Maintenance
Hot line Jointing kit
Buchholz Relay Pre-stressed concrete
Cable Commercial losses
SECTION B
Answer any eight questions from the following: 8x5=40
4. What are the main equipments used in a distribution substation Describe each in brief.
5. How would you prevent low breakdown voltage of transformer oil
6. Describe the various short-term measures that can be taken to reduce technical losses.
7. Explain the measures which a utility can take to improve collection.
8. Write a short note on legal measures that can be taken in accordance with the Electricity Act, 2003 to prevent power theft and other irregularities.
9. Explain why single/two phasing in rural areas should be avoided.
10. How would you remove water condensate in a transformer? Explain.
11. Explain the earthing arrangement used in a 33/11 kV substation.
12. Describe the configuration of feeders used in a distribution system in short.
13. What are the objectives of operation and maintenance of distribution systems?
14. Explain how you would detect fault in an underground cable.
15. Write a short note on clamp meters.
16. Describe in short the types of terminations used for cable jointing.
CERTIFICATE OF COMPETENCY IN POWER
DISTRmUTION (CCPD)
Term-End Examination
June, 2016
UU438
OEE-002 POWER DISTRIBUTION SYSTEM -BASICS
Time: 3 hours. Maximum Marks: 70
Note: This paper has two sections -Section A and Section B. Both these sections are compulsory. Remarks have been mentioned in the section/question along with marks. Write your answers in English or Hindi language only.
SECTION A
1. Fill in the blanks. Choose the correct answer from the choices given below: 15xl=15
(fault, 70, moisture, aluminium, LV, vertical, three, apparent, smart card, meter, inherent, open, 250, billed, 650, isolate)
In a loop arrangement, the feeder is normally loaded to of its capacity so that in the event of breakdown it can share the load of other feeders also.
The circuit breaker is a switching device to interrupt not only the load current but also the current.
Collection efficiency is defined as amount realized to amount
Technical loss is in the systems as all the electrical devices have some resistance and flow of current causes a power loss.
The is the cash register of the utility.
65% of the failures in a distribution transformer are due to damage to coils.
A tri-vector meter is designed to record active, reactive and energy along with MD indicator on all phases.
(viii) Shackle insulators are used for distribution lines dead ending and supporting conductors laid in formation.
Pre-paid metering is a system whereby consumers purchase electricity through a .
Medium voltages are voltages above volts and up to volts.
Interlocks should be there between isolator and earthing switch so that no earthing switch can be closed unless and until corresponding isolator is in position.
Painting of metal parts of distribution transformer is done once in years to avoid corrosion.
(xiii) Muddy colour on inspection of oil sample indicates the presence of .
The substations have current and voltage transformers designed to electrically high voltage primary circuit from the low voltage secondary circuit.
In the case of AAC and AAAC conductor all the strands are of .
2. Write True or False for the statements given below: 10x1=10
In the case of ACSR conductor, the central core is of aluminium.
A breakdown of the insulation of cable, which allows current to flow from core to earth is called a ground fault.
While inspecting oil sample of a transformer green colour indicates the presence of dissolved copper compounds.
The minimum breakdown voltage rating for transformers up to 66 kV is 40 kV.
Surge arrester is a protective device for limiting surge voltages on equipment by discharging or bypassing surge current.
Shunt capacitors are connected on the primary side (33 kV) of the 33/11 kV power transformer.
Supplier measures insulation resistance of installation by Megger applying 500 volt DC for one minute and insulation resistance must not be less than one mega ohm.
(viii) 11 kV is a primary distribution voltage.
Guard wires are used at all points where a line crosses a street, road or railway line.
Electromechanical meters are extremely difficult to tamper and if somebody attempts to tamper them, it will record the information.
3. Match the following given in Column with Column 5x1=5
Column Column'B'
Pilferage Gas
Pole Maintenance
Hot line Jointing kit
Buchholz Relay Pre-stressed concrete
Cable Commercial losses
SECTION B
Answer any eight questions from the following: 8x5=40
4. What are the main equipments used in a distribution substation Describe each in brief.
5. How would you prevent low breakdown voltage of transformer oil
6. Describe the various short-term measures that can be taken to reduce technical losses.
7. Explain the measures which a utility can take to improve collection.
8. Write a short note on legal measures that can be taken in accordance with the Electricity Act, 2003 to prevent power theft and other irregularities.
9. Explain why single/two phasing in rural areas should be avoided.
10. How would you remove water condensate in a transformer? Explain.
11. Explain the earthing arrangement used in a 33/11 kV substation.
12. Describe the configuration of feeders used in a distribution system in short.
13. What are the objectives of operation and maintenance of distribution systems?
14. Explain how you would detect fault in an underground cable.
15. Write a short note on clamp meters.
16. Describe in short the types of terminations used for cable jointing.
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Subjects
- Electricity and Safety Measures
- Power Distribution System- Basics