1. Prepaid Energy Meter using Smart Cards

2. Overview Efficient scheme of electricity billing Functionality
Beneficial to consumers, power plant, revenue, power sector reforms

3. General block diagram UTILITY CARD MICRO CONTROLLER POWER
SWITCHING SECTION
DESTINATON
SOURCE

4. The metering system Utilities and revenue system
Present electricity billing system
• Advantages and disadvantages
Present prepayment metering system
• Market scopes

5. Prepayment metering system
Improved operational efficiencies
Reduced financial risks
Better customer service
Market drives:
Power sector reforms, Increasing non-technical reforms, opportunities in markets
Market restraints:
Customer behavior, Initial investment, rapid tech changes, uncertainty over success

6. Recent initiatives and plans
South Africa and England
Malaysia, Thailand, Bangladesh, Singapore, Iran
West Bengal– Sundrebans
Tata power – in Delhi and Jamshedpur
Mumbai BEST service
US patents released

7. Present prepayment system
Difficult to install and costly
No communication back to utility
No knowledge on consumption and tampering info on utility

8. Smart cards Same size as a standard credit card
A microchip embedded in a plastic card to store information
Latest silicon technology, does not require use of batteries
The chip can be programmed to carry out specific functions

9. Advantages & applications of smart cards
Convenience, portability, capacity, durability, security and ability to check forgery
ID card, log card, garage card, hotel key card, health care, vehicle id, banking, prepayment electricity

10. The proposed system Use of prepayment system Smart card usage
Communication with utility system
3-tier implementation
Supply management with added security

11. Advantages Reducing reading expenses Bad debt collection
A/c transfer expenses & credit debt expenses
Greater awareness on consumers consumption habits
Improved cash flow management

12. Large scale implementation
User has a ID card
Gives money to ATM and gets the smart card credited
Customer terminal and service terminal manage electric supply and comm. With service
Utility services update with the data and consumer behavior

16. Hardware Requirements
AT89S51 µC
LCD Lampex 16ₓ2
SLE4442 smart card reader/writer, MAX 232
EEPROM AT24C256
Relay and Power supply
Optocoupler cosmo N35
Meter and load
DB9 connector, resistors, capacitors and sip resistors

17. Software requirements
Keil C compiler µVersion 3
µFlash
Orcad

18. Prepayment energy meter using smart card
Relay
Load
Energy meter
8051
microcontroller
Opto
coupler
LCD MC
Smart card
Reader/writer
EEPROM
Power supply

19. Schematic diagram Port 1 is connected LCD
Port 3 is connected to EEPROM
Port 0 to relay
Smart card module is connected via DB9 connector and max232 to microcontroller
Meter is connected to load and optocoupler and one end of load to relay.

20. Working The consumer inserts the pre-paid card in the energy meter
The value in the card is transferred to the meter and load is ON
The meter keeps track of the number of units consumed as per the slab rate and updates it to the controller via cosmo 2010
When the value in the card comes to electricity supply is cut off

21. Conclusion
A better solution for utility management and beneficial to consumers, power reforms and market.
A prototype for customer terminal is successfully constructed