The aim of our presentation is to describe the AC Distribution system in Bangladesh. Following are the focused points in terms of Bangladesh perspective: 1. Distribution Procedure 2. Primary and Secondary Distribution System 3. Distribution Substation 4. Distribution Companies 5. Distribution in both City and Rural Area 6. Distribution Loss 7. Protective Devices 8. User Variety 8. Billing Procedure

1. AC Distribution
System in
Bangladesh

2. Members:
1. M. M. Muhiuddin - 201516064.
2. Chayan Halder -201516067
3. Kaberi Islam - 201516113
4. Ken Fahmidur Rahman - 201516114
5. Fatema Sharmin - 201516115
6. Tabir Ahmed - 201516116
7. Fardin Sabahat Khan - 201517117
8. Muhammad Ridwanul Hoque - 201416074
9. Kazi Md Shahriar Sakib - 2014160121

3. Aim:
The aim of our presentation is to describe
the AC Distribution system in Bangladesh.

4. Scope:
1. Distribution procedure.
2. Primary and secondary distribution system.
3. Distribution substation.
4. Distribution companies.
5. Distribution in both city and rural area.
6. Distribution loss.
7. Protective devices.
8. User variety.
9. Billing procedure.

7. Distribution System

8. “
● “The part of power system which
distributes electrical power for local
use is known as DISTRIBUTION
SYSTEM.”
● This system is the electrical system
between the substation fed by the
transmission system and consumer
meter.
● Distribution line generally consist of
● Feeders
● Distributors
● Service mains

10. .
Feeder:
◇A Feeder is conductor which connects the
substation to the area where power is to be
distributed .
◇Feeder are used to feed the electrical power
from the generating station to the substation
◇No tapings are taken from the feeder
◇So the current in it remains the same throughout
◇Main consideration in the design of feeder is the
Current carrying capacity.

11. Distributer:
◇A distributer is a conductor from which tapings are
taken from pole mounted transformer to the consumer
◇The current through a distributer is not constant
because tapings are taken at various places along its
length
◇Voltage drop is main consideration
◇Limit of variation is 6% of rated at consumer

12. Service mains
◇A service mains is a generally a small cable which
connects the distributer to the consumer ‘s meter.
◇The connecting links between the distributor
and the consumer terminals.

14. Primary distribution system
◇ voltages somewhat higher than general utilization and
handles large blocks of electrical energy than the average
low-voltage consumer uses.
◇Commonly used primary distribution voltage 11KV, 6.6
KV,3.3 KV.
◇Electric power from the generating station is transmitted at
high voltage to the substation located in or near the city.
◇At this substation, voltage is stepped down to 11 kV with
the help of step-down transformer.
◇Power is supplied to various substations for distribution or
to big consumers at this voltage.

16. Secondary distribution
system.
◇It is that part of a.c. distribution system which
includes the range of voltages at which the ultimate
consumer utilizes the electrical energy delivered to
him.
◇ The secondary distribution employs 400/230 V, 3-
phase, 4-wire system.

18. Distribution Substation

19. A distribution substation transfers power from the
transmission system to the distribution system of an
area. It is uneconomical to directly connect electricity
consumers to the main transmission network, unless
they use large amounts of power, so the distribution
station reduces voltage to a level suitable for local
distribution.
In Bangladesh there are 85 grid substations that
receive power from high voltage transmission lines and
deliver it to the consumers through tens of thousands
of kilometres 33 kV, 11 KV and 0.4 kV distribution lines.

20. Distribution substation is generally comprised of the
following major components:
❑ Supply Line
❑ Transformers
❑ Busbars
❑ Switchgear
❑ Outcoming feeders
❑ Switching apparatus
i. Switches
ii. Fuses
iii. Circuit breakers
❑ Surge voltage protection
❑ Grounding

21. Distribution
Companies

22. Distribution Companies
◇ Bangladesh Power Development Board
(BPDB)
◇ Dhaka Power Distribution Company
(DPDC)
◇ Dhaka Electric Supply Company Ltd
◇ West Zone Power Distribution Company
(WZPDC)
◇ Rural Electrification Board (REB)

23. “
Distribution companies of city areas:
DPDC and DESCO are responsible for distribution business
in capital city Dhaka.
BPDB and WZPDC are responsible for distribution of urban
areas other than Dhaka.
Distribution companies of rural areas:
Rural Electrification Board (REB) is responsible for
distribution in rural areas through 70 PBSs.

24. Distribution Companies

25. Desco provide last mile services in the electricity
supply value chain. Desco are responsible for
transforming or stepping down electricity from
the high voltage of 132 kV at the transmission
level, to the lower voltage levels of
33kV/11kV/0.415kV depending on the category
of customer. Desco are also responsible for the
marketing and sale of electricity to customers.
Dhaka Electric Supply Company (DESCO)

26. Dhaka Power Distribution Company (DPDC)
DESA, the ancestor of DPDC was established
as part of a reform process to ensure better
services to the electricity consumers, develop
the power distribution system and reduce
system loss. Before the setting up of DESA, the
power development board suffered a system
loss of 45%. DESA managed to cut it down to
around 26%. But now a days DPDC has
managed to cut down the system loss to single
digit in recent years.

27. Bangladesh Power Development Board (BPDB)
BPDB is responsible for distribution of
electricity in city portion of Chittagong,
Comilla, Sylhet, Mymensingh, Rajshahi and
Rangpur.
Presently BPDB's distribution network is
comprising of 33 KV, 11 kV and 11/0.4 KV
lines. Total number of consumer of different
category is about 26,53,946 at the end of FY
2013.

28. West Zone Power Distribution Co. Ltd (WZPDCL)
WZPDCL deliver quality electricity at
reasonable and affordable prices with excellent
professional services. WZPDCL is working to
make electricity available to all citizens in 21
districts under WZPDCL area by the year 2021.

29. Ac distribution in
Rural area

30. Want big
impact?
Use big
image.

31. “
Presently 260,000 km distribution lines
with 11.5 million consumers of 52.300
villages are connected. Yet about 75
million people, mostly rural, are out of
electricity. To provide reliable power to
the rural area REB through PBSs has
taken measures to expand distribution
network.

32. Rural Electrification Board (REB):
◇REB is responsible for electrification in rural areas. It has the
vast electricity distribution network all over the country and the
electric power plants are connected with the transmission line
to assure the continuity of electric power. As of today, there are
70 operating rural electricity co-operatives called Palli Bidyuit
Samity (PBS), which bring service to approximately 79,00,000
connections. REB has expanded its distribution networks
significantly in past years and has thus made immense
contribution in increasing agricultural products and rural
development. REB is now more developing system day by day
and using digital meter instead of analog meter for the
consumer.

34. Distribution loss
Distribution loss in Bangladesh has come down
significantly to 11.28 % in FY 2015 from 15.52 % in FY
2007. This is a success story of Bangladesh’s power
sector. Distribution entities achieved this success due to
mainly curbing non-technical (i.e. pilferage, theft, meter
manipulation etc.) losses. The figure below depicted
gradual reduction of distribution losses.

36. Protective
Instruments

37. Necessity not luxury
1. To reduce Equipment Damage
2. To minimize the time of user affected
3. Minimize different environmental hazard like Fire
4. To keep the substation running despite of one
Faulty instrument

38. Relay:

39. SF6 and Oil Circuit Breaker:

40. FUSE

41. Users Variety

43. Users Variety:
Supply Voltages:
Single Phase: 230V±10%, 50Hz
Triple Phase: 440V±10%, 50Hz
11kV, 50Hz

44. Customer Category
1. Category A: Residential
2. Category B: Agricultural pumping
3. Category C: Small Industries
4. Category D: Non-Residential (Light & Power)
5. Category E: Commercial & Office
6. Category F: Medium Voltage, General Purpose (11 KV)
7. Category H: High Voltage, General Purpose (33 KV)
8. Category J : Street Light and Water Pumps

46. Billing System

47. “
Billing System
Post-paid Metre
A post paid meter is one that immediately
provides electric power to users once it has
installed. In this process distribution company
collects the meter reading every month manually
and charged a bill monthly. Customer has to pay
the bill following the available processes.

48. Billing System
Pre-paid Metre:
In this process electricity is provided after the payment has done.

49. Tariff Rate

50. Thanks!
Any questions?