31-05-2012, 12:16 PM
A NOVEL TECHNIQUE FOR PREVENTING CURRENT METHOD ELECTRICITY-STEALING
A NOVEL TECHNIQUE FOR PREVENTING CURRENT .ppt (Size: 170 KB / Downloads: 63)
Abstract
Nowadays, with expanding of power electricity demand, more and more lawless individuals or organizations take various means to steal electricity in order to save payout and gain high profit.
It makes country incur huge losses and disturbs the normal economy order.
So, completing electricity stealing prevention technique and restraining electricity stealing activities have much sense.
According to principle of energy measurement, the consumed power energy equals the product of voltage, current, power factor and time, so changing any one of them may achieve electricity-stealing.
Proposed System
In this system we have used current sensor to find the electricity stealing in the form of voltages.
For normal load, current sensor’s output have already stored as predefined value in the PIC 16F877A.
We will monitor the current sensors continuously.
Whenever current sensor output exceeds the predefined value.
we will cut off the electricity using DPDT switch and also we will send the message using GSM modem.
INTRODUCTION OF PIC16F877A:
The PIC16F877A CMOS FLASH-based 8-bit microcontroller is upward compatible with the PIC16C5x, PIC12Cxxx and PIC16C7x devices. It features 200 ns instruction execution, 256 bytes of EEPROM data memory, self programming, an ICD, 2 Comparators, 8 channels of 10-bit Analog-to-Digital (A/D) converter, 2 capture/compare/PWM functions, a synchronous serial port that can be configured as either 3-wire SPI or 2-wire I2C bus, a USART, and a Parallel Slave Port.
High-Performance RISC CPU
Operating speed: 20 MHz, 200 ns instruction cycle
Operating voltage: 4.0-5.5V
Industrial temperature range (-40° to +85°C)
15 Interrupt Sources
35 single-word instructions
All single-cycle instructions except for program branches (two-cycle)