Prepaid Energy Meter using Smart Cards

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
POWER
DESTINATON
POWER
SOURCE

4. The metering system
 Utilities and revenue system
 Present electricity billing system
• Advantages and disadvantages
 Present prepayment metering system
• Advantages and disadvantages
• 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 2010 4N35
 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
8051
microcontroller
Power supply
LCD
EEPROM
Smart card
Reader/writer
Energy meter
Relay Load
Opto
coupler
MC

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