1. Objective:-
Indian power sector is facing serious problem of lean revenue collection as against energy
supplied due to energy thefts and network losses. All the steps taken so far, regarding the
improvement of the revenue collection did not yield satisfactory results. It is reported that the
most faulty sub system is the metering and meter reading system. The traditional billing systems
are discrete, inaccurate, costly, slow, and lack flexibility as well as reliability. Therefore, several
attempts were made to automate the billing systems. Even though accurate and fast readings are
obtained, bill payment is still performed based on the old billing procedure. They require an
individual/agent to physically come and take down the readings and report to house hold/office
the amount one has to pay. To understand, analyze, design and develop an on line pre-paid
energy meter which provides both the suppliers and the consumers with better services regarding
meter billing and payment.
Description of project:-
This is a very good microcontroller based application. This unit will accept the number of units
recharged by the concerned department person, counts the number of units consumed by the
customer and as soon as the customer exceeds the recharged amount, it will disconnect the power
supply to the customer until the next recharge. Whenever the number of units in microcontroller
becomes zero microcontroller sends a signal to “Contact Maker /Breaker circuit” which is
nothing but the relay and this relay cuts off the power supply to the consumer until next recharge.
Here analog energy meter is replaced by a digital energy meter. The digital energy meter used
here is a high accuracy; low cost, single phase power meter based on the ADE7757.The meter is
designed for use in single phase 2 wire distribution system. A relay is connected in between
power lines and the load. The relay is controlled by the primary controller.
Microcontroller 89C51 acts as the primary controller. The primary controller collects
information from digital energy meter as well as from the smart card. Smart gives information
about the limitation of units. The digital energy meter reading is compared with the smart card
information by the primary controller and hence suitably primary controller controls the relay.

2. Definition of Project:-
The aim of this project is to design a prepaid energy meter to monitor the consumption of
electricity in domestic needs. The standard business model of electricity retailing involves the
electricity company billing the customer for the amount of energy used in the previous month or
quarter. In some countries, if the retailer believes that the customer may not pay the bill for what
ever reason a prepayment meter may be installed. This requires the customer to make advance
payment before using the electricity. If the available credit is exhausted then the supply of
electricity is automatically cut off by a relay.
BLOCK DIAGRAM:-
Working:-
When the consumer insert a smart card into the card reader which is connected kit.Then the card
reader will read the stored information and delete the information from the EEPROM IC(smart
card) using the MC program. So that the smart card cannot be reused by others. Suppose if a
consumer buy a card for Rs.50/- he / she can insert this amount through the card reader so that
prepaid energy meter with tariff indicator kit will be activated. According to the power
consumption the amount will be reduced. When the amount is over, the relay will automatically
shutdown the whole system. In our project we also have a provision to give an alarm sound to
consumer before the whole amount is reduced. You can also find the Card programmer circuit

3. and program from the download. So that you can easily create your own cards.
When the consumer insert a smart card into the card reader which is connected kit.Then the card
reader will read the stored information and delete the information from the EEPROM IC(smart
card) using the MC program. So that the smart card cannot be reused by others. Suppose if a
consumer buy a card for Rs.50/- he / she can insert this amount through the card reader so that
prepaid energy meter with tariff indicator kit will be activated. According to the power
consumption the amount will be reduced. When the amount is over, the relay will automatically
shutdown the whole system. In our project we also have a provision to give an alarm sound to
consumer before the whole amount is reduced.
You can also find the Card programmer circuit and program from the download. So that you can
easily create your own cards.
Component list:-
S.No. COMPONENT SPECIFICATION QUANTITY
1. MICRO CONTOLLER ATMEL8952 1
2. CRYSTAL
OSCILLATOR
11.0592 Hz 1
3. LCD 16*2 1
4. POTENTIOMETER 10 K 1
5. TRANSISTOR(PNP/NPN) BC 557 1
6 LED’s 6
8. SWITCHES Push to on 7
9. CAPACITORS 10Uf,22pF 1.2
11. RESISTANCES 3.3kohm 7
12. PCB Specific 1
13 PULL UP RESISTOR 10K 1
14 RF MODULE 455Hz 1
15 IC HT-12E 1
16 IC HT-12D 1
17 IC 555 1

4. 18 ANTENNAS 2
Hardware and software details:-
1.keil software
2.proteus
Advantage:-
1.Improved operational efficiencies: The prepaid meters are likely to cut the cost of meter
reading as no meter readers are required. In addition, they eliminate administrative hassles
associated with disconnection and reconnection. Besides, going by South Africa’s experience,
prepaid meters could help control appropriation of electricity in a better way than conventional
meters.
2.Reduced financial risks: Since the payment is up-front, it reduces the financial risk by
improving the cash flows and necessitates an improved revenue management system.
3.Better customer service: The system eliminates billing delay, removes cost involved in
disconnection/reconnection, enables controlled use of energy, and helps customers to save
money through better energy management.
Market Drivers
1.Power sector reforms: The upcoming competitive and customer focused deregulated power
distribution market will force the market participants to make the existing metering and billing
process more competent. This is likely to drive the prepaid market.
2.Increasing non-technical losses: Metering errors, tampering with meters leading to low
registration and calibration related frauds are some of the key components of non-technical

5. losses. India reports greater than 10 percent of non-technical losses. It has been reported that
prepaid meters control non-technical losses better than conventional ones.
3.Opportunities in the emerging electrifying markets: Most of the Asian countries do not
have 100 percent electrification; hence new markets are being created by the increasing
generating capacity. Prepaid systems can be more easily introduced in such new markets rather
than the existing ones.
Scope
• The system can be made more user friendly by using smart card
technology.
• Further work can be done in reading the consumed energy from energy
meter wirelessly using Bluetooth technology.
Conclusions
An attempt is made in this work to develop a system, which when interfaced with static
electronic energy meter works as an online prepaid energy meter. The consumers and the
suppliers can be benefited by using the online prepaid energy meter in the following ways
• This system is of great advantage for the electricity department as this unit can be utilized
effectively for preventing power theft, non-payment of electricity bills etc.
• The whole process of billing can be centralized.
• Cost of manpower for billing / collection is reduced.