The document discusses the process of designing the power distribution system for a housing colony. A consultant is hired to calculate loads, select components, and design the system according to regulations. The consultant considers the number of houses, assigns loads, calculates total load, selects conductors and transformers, and estimates costs. The design is approved by WAPDA who issues a demand notice to the developer for construction costs.

1. DISTRIBUTION SYSTEM
OF VIRTUAL HOUSING
COLONY

2. GROUP MEMBERS
Hamid Raza 2008-EE-40
M Asim Noon 2008-EE-24
Zain-Ul-abdin 2008-EE-48

3. PRESENTED TO
ENGR. TOUHEED-UR-REHMAN

4. DISTRIBUTION SYSTEM OF
VIRTUAL HOUSING COLONY
► Power distribution system of a housing
colony is that part of electric power system
which is dedicated to delivering electric
energy to the end users of a housing
colony.

6. ► Now a days housing colonies are very
common for purchasing a house. In this
process buyer has to pay a fixed cost to the
developer and in return developer provide a
house. It is the responsibility of the
developer to provide water, natural gas and
electric power supplies to the house
owners. The developer has to pay the cost
of constructing these systems in the colony.

7. ► The development of this distribution system
is done according to the rules defined by
water and power development authority
(WAPDA) Pakistan in 1993-94.

8. ROLE OF CONSULTANT
► As the developer is not able to design
distribution system and implement laws
provided by WAPDA so he has to hire a
consultant for this purpose. A consultant is
an electrical engineer or may be associate
electrical engineer recognized by Pakistan
engineering council (PEC).

9. ► PEC recognization describes that the
consultant knows all the things about
distribution system. So it is the indirect way
of knowing that the consultant knows all the
things regarding distribution system of
electricity.

10. The consultant receives the following things by the developers.
► MDA/TMA approved plan .
It means the design of the specified housing colony
which is approved by Multan Developmental authority MDA /TMA.
► Property owner proof.
It means that the documents that shows that the
developer is the owner of the part of land on which he is constructing
the housing colony.
► An authority letter to the consultant .
It specifies that the consultant is chosen to work by
the developer and the developer has to pay for that.

11. ► Diagram 1:- Distribution system of a virtual housing colony
► In this diagram the map shown is plan approved by MDA/TMA

12. LOAD CALCULATION
► From here now starts the work of consultant
which is the designing of the distribution
system of housing colony. For this purpose
he has to design the load in kilowatts of the
housing colony according to the plan or map
provided by the developer.

13. ► In designing the distribution system the consultant
have to consider the existing electric system of
distribution. For example if the power supply line is
not present near the location of the colony then he
has to consider the cost and design of electric line
from any nearest point to that location. Or it may
possible that the line is passing through the
housing colony in un desired manner so he has to
change its way into desired path.

14. Table 1:-) load of different appliances
Appliance Watts
Air Conditioner
Room* 1000
Central* 2000 – 5000
Blender 300
Ceiling Fan 10 – 50
Computer
Laptop 20 – 75
Desktop PC 80 – 200
Printer 100
Iron 1000
Microwave 600 – 1500
Sewing Machine 100
Table Fan 10 – 25
Toaster 800 – 1500
Washing Machine 500
TV (25" color) – 150

15. Table 2:- Load calculation of 5 Marla house is given below
Appliances No of Appliances Loads ( watt)
Computer 1 120
Television 1 70
energy saver 9 180
Ceiling Fan 4 320
Exhaust fan 2 50
Tube light 2 80
Water pump 1 750
Refrigerator 1 475

16. Some of the commen appliances normally used in a house are given below
Fan Microwave oven
Personal computer Exhaust fan

17. Water pump Refrigerator
Television Iron

18. ► For load calculation WAPDA has defined
the load of houses of different sizes. The
assigned load is different for rural and urban
areas. In urban areas load is greater as
compared to in rural areas. These assigned
loads are given below in the tables.

19. Table.3 in urban areas load of a house according to its size
Size (Marla) load (kw)
5 2
7 3.2
10 5
15 7
20 9

20. Table.4 in rural areas load of a house according to its size
size (Marla) load (KW)
5 1.6
7 1.68
10 2
15 3.2
20 4

21. LOAD CALCULATION OF A COLNY
► The consultants calculate the number of
houses in a housing colony. Assigns the
loads to there house according to the table
and then adds them all. This assigned load
is calculated by adding average amount of
power consumed by electric appliances
used in a house. In this way average
amount of load per house is calculated. The
load of different appliances are given
previously.

22. ► In this load we have to add the load of street
lights. It can be 125 watts per pole. We also
have to consider the losses produced by the
internal wiring of the house. In this way the
load of a housing colony is determined in
kilowatts which will be there sum. This is
called total connected load.

23. ► According to this Diagram load calculation is given below.

24. Table 4:- load calculation
Marla Load per house No of houses Load (kw)
5 2 66 132
6 2.7 4 10.8
7 3.2 2 6.4
7.5 3.4 2 6.8
8 3.6 3 10.8
8.5 3.88 8 30.4
9 4.1 2 8.2
10 5 8 40
10.5 4.8 1 4.8
11.5 5.2 1 5.2
Total 97 255.4

25. ULTIMATE LOAD
► As we know that all the appliances are not
used simultaneously in whole day. So we
take average amount of load being used.
For this purpose we take 70% of total
connected load. This is called ultimate load.
From ultimate load we can calculate KVA by
dividing it with power factor.

26. DIVERSITY FACTOR
► It is the ratio of the sum of the individual
non-coincident maximum demands of
various subdivisions of the system to the
maximum demand of the complete system.
a 70% diversity means that the device in
question operates at its nominal or
maximum load level 70% of the time that it
is connected and turned on

27. ► The total load of housing colony is 255.4
kw. So by considering the diversity factor
the ultimate load will be 178.78 kw.

28. SELECTION OF
COMPONENTS
► According to this ultimate load the
consultant decides which type and size of
conductors should be used , how many
transformers should be there and of what
rating and so many other things

29. ► If the amount load is less as a result the
amount of current will be less ampere so we
use Ant conductor which is for less ampere
rating and also a cheap conductor.
Otherwise we can also use wasp conductor
which is used for high ampere rating but
also costly.
► You can also use all aluminum alloy
conductor.

30. ANT, All Aluminum Conductors
► This conductor is also known as aluminum
stranded conductor. This conductor is
manufactured from electrolytically refined
aluminum, having purity of minimum 99.5%
of aluminum. This conductor is used mainly
in urban areas and the spacing is short and
the supports are close. All aluminum
conductors are made up of one or more
strands of aluminum wire depending on the
end usage.

31. ANT
LT Conductors Size Current Capacity
(amp)
Ant 7/.122 135-200

32. WASP
LT Conductors Size Current Capacity
(amp)
Wasp 7/.173 230-315

33. BILL OF QUANTITIES
► Now the consultant have to create bill of
quantities (BOQ). It is the list of all
equipments which are to be used in the
construction of distribution system of the
colony. It includes the amount of conductor ,
number of high tension and low tension
poles number of transformers and all other
miscellaneous components which are to be
used

34. According to this diagram bill of quantities is given below

35. Table 5:- Bill of quantities
S.No. Material Qty Unit
1. LT Pole 13 No's
2. HT Pole 2 No's
3. -X-Arms 2 No's
4. 11KV Pin Insulator 6 No's
5. Disc Insulator 28 No's
6. Anchor Shackle 52 No's
7. D-Fuse Fitting 3 No's
8. HT CABLE 3285 meters
9. LT CABLE 7720 meters

36. Some of common components to be installed in a distribution are given
below
Pole
Stay wire stay clips

37. Stud stay Transformer

38. ESTIMATION OF COST
► Now consultant calculates the cost of this
project. It is done by adding individual costs
of all the components used. Price of some
components is given in following table

39. TABLE 4:-) The cost of different components is given below
S.No. Material Qty Rate Amount
( Rs ) ( Rs )
1. LT Pole 13 10000 130000
2. HT Pole 2 14000 280000
3. Steel-X-Arms 2 2800 5600
4. 11KV Pin Insulator 6 132 792
5. Disc Insulator 28 600 16800
6. Anchor Shackle 52 54 2808
7. D-Fuse Fitting 3 2500 7500
8. HT CABLE (WASP) 1001.268 50 50063.4
m
9. LT CABLE (ANT) 2353.056 26 61179.456
m
10. Transformer200 KVA 1 520000 520000
Total Cost of Materials used 1074743

40. GRID SHARE CHARGES
► As load of a colony is share on the nearest
grid station so the developer has to pay grid
share charges. Actually the grid share
charges are 5500 rupees per KW of the
ultimate load . Its 50% amount is paid by
WAPDA and from remaining 50% half is
paid by the developer and half by the end
user. Normally end user is not directly
paying them and developer pay this
amount.

41. ► According to the diagram 1, the ultimate
load was 178.78 kw. So total “Grid Share
Charges” are 983290 rupees. Thus WAPDA
will pay 491645 rupees and same will be
paid by developer

42. DESIGNING OF THE
SYSTEM
► Next step is to design the power distribution
system of the housing colony. There are many
software for designing it. ECAD is very popular in
this field. The design of the system is according to
the map or plan provided by the developer. It
can be closed loop system, open loop system ,
double supply system or may be radial system. By
analyzing the construction of the colony any
suitable distribution scheme can be used.

43. APPROVAL OF THE
DESIGN
► The design made by the consultant is given
to WAPDA for approval. It checks that if the
design is according to the rules and
regulations provided by WAPDA. So they
can also reject the design if it feels any
problem with the design.

44. DEMAND NOTICE
► After approval of the design WAPDA issues
a demand notice to the developer. The
developer has to pay this amount for the
construction of power distribution system in
the colony. It includes the following things.

45. ► 1. Design weighting charges :-)
These charges are 0.5% of cost of
the material used in the construction. This is
actually the fee paid to the WAPDA for
approval of the design.

46. ► 2. Total cost of material :-)
it is the sum of cost of all the
material to be used in construction of
system

47. ► 3. Grid share charges :-)
These are the charges paid for
sharing the grid station with the load of the
colony.

48. ► As total cost of material is 1074743 Rs.
► Design weighting charges are 5373 Rs.
► Grid share charges paid by Developer are
491645 Rs.
So
Total cost estimation for Power Distribution of
housing colony will be 1571761 Rs.

49. EXAMPLES
► OVERHEAD DISTRIBUTION SYSTEM
Buch executive villas
By Captain Developers
Bosan Road near Baha ud din zakariya
university Multan.

51. ► UNDER GROUND DISTRIBUTION
SYSTEM
Pearl City
By Hashoo group
Near askariya by pass Multan.

52. Low Tension Lines
High Tension Lines

53. CONSTRUCTION
► After the payment of the demand notice
WAPDA starts construction in that location
according to the plan provided by the
consultant. All this work is done in the
supervision of an Electrical Engineer to
insure that the work is according to the plan.

54. EXECUTION
► At the end the newly developed power
distribution system is connected with the
power supply .

55. SPECIAL THANKS TO
► ENGR. TOUHEED-UR REHMAN
► ENGR. MIAN YOUSAF IQBAL
(MEPCO)
► MUHAMMAD SHAHID
(ALKHURABA
CONSULTANTS NAWAN SHEHAR
MULTAN)

56. THANK YOU
PROUD TO BE WHAT YOU
ARE !
ALLAH HAFIZ