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I OEE-002

CERTIFICATE OF COMPETENCY IN POWER DISTRIBUTION (CCPD) Term-End Examination December, 2011 OEE-002 : POWER DISTRIBUTION SYSTEM - BASICS Time : 3 hours Note :

Maximum Marks : 70

This paper has two sections, Section A and Section B. Both the sections are compulsory. Remarks have been -

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mentioned in the section along with the marks. SECTION - A 1. Fill in the blanks. Choose correct answer from the choices given below : 15x1=15 Electrical test, Buchholz Relay, tap changers, energy loss, poor billing, T and D losses, switching surges, Time test, Preventive maintenance Insulator, high no load losses, Breather, TOU meters, Mt, Installation audits, prepaid meters. (a)

is the difference between the units injected and the units billed to ultimate consumer.

(b)

____ is used to calculate energy losses.

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(c) Revenue raising segment of the utilities suffers from basic deficiencies of and (d)

are a short term measure for preventing revenue loss.

(e)

facilitates load control and planning on the part of utilities.

(f)

The use is almost total elimination of non-payment of bills.

(g)

is decided by operating requirements of voltage and current,

(h)

is a protective relay of transformer.

(i)

prevents the oil to get moisture from the atmosphere.

(j)

may reduce the life of transformer.

(k)

Over voltage is produced due to in distribution system.

(1)

resists the flow of electricity.

(m) is testing of resistence in the main circuits. (n)

track alignment and interlocking mechanism.

(o)

for detection of deterioration and mal operation of system components.

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2. Write True (.,/ ) or false (X) for the statements given below. (a) (b)

1x10=10

Shackle insulator are used for distribution lines of voltage below 1000 V. ) Conductors represent 30-50% of the installed cost of the line. )

(c)

Objective of power distribution organisation is to minimize the security of supply. ( )

(d)

Vertical mounting of meters should be ensured. ) Lower current results in higher heat energy wastage. () Siiiiejarresters responds to over voltages ( )

(e) (f) (g) (h) (i) (j)

Pilferage of energy is due to overhead bare conductors. ) High technical losses are due to high power factor. )

Increase of HT : LT ratio will reduce technical loss. ) Current rating, of transmission line indicates type and magnitude of voltage. )

3. Match the following in coloum 'A' with coloum 'B' : 5x1=5 Colounm 'A' (i) Collection efficiency (ii) Energy realised (iii) AT and C losses (%) (iv) Transmission voltage (v) Distribution voltages

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Coloumn 'B' (a) Energy billed x collection efficirtcy (b) Energy input - Energy realised Energy Input (c) Amount realised (Rs) Amount billed (Rs) (d) 11 kV, 400 V (e) 220 kV, 66 kV.

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x 100

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SECTION : B Attempt any eight (8) questions. 8x5=40 1.

What are the aggregate technical and commercial losses ?

2.

How can we improve the billing and collection of any Electrical Utility ?

3.

What are the different methods of theft and pilferage of energy ?

4.

Discuss the metering techniques of LT and HT system.

5.

Why do we not transfer power to the feeder level at the main receiving station itself ?

6.

How does use of high voltage reduce electric power loss in distribution system ?

7.

What are the necessary requirements of jointing of cables ?

8.

How is a cable laid underground is protected from damage ?

9.

Describe the different tests performed on transformers.

10.

Briefly classify the distribution transformers in utilities ?

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11.

Distinguish between current and voltage transformer ?

12.

What are the advantages of under ground cabling ?

- T

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