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Protection of Transformer

 

 

Introduction:

In this project we will measure the heat losses by transformer . we will show data digitally on LCD 16*2. we will use LM 35 sensor to measure heat losses.

 

 

IN normal temperature controller we get a output for  on and off purpose only but in this project we control the speed of the  fan automatically.  In brief firstly we convert the temperature into small voltage with the help of lm 35 sensor. LM 35 is temerature sensor  convert the temperature in to small voltage at very accurately. Output of the temperature sensor is further converted into digital signal with the help of the ADC. IN this project we use ADC0809 . ADC 0809 is a 8 bit ADC and convert the any analogue signal into digital signal in 100 microsecond. To control the ADC we required a clock pulse, and 4 different signal . All this signal is provided by the controller. IN this project we use ic 89s51 as a main controller. IC 89s51 sense the output from the ADC in hex code. This HEX code is further converted into binary code with the help of program code inside the controller. IN the output device we use LCD display . LCD display display the contents of the display with the  help of the ASCII code. ASCII CODE  is a special code for displaying the character in the LCD.  In the controller we convert the binary code in to ASCII codes with the help of the code conversion program. Temperature sensor by the lm 35 is  now display in the ASCII code on the LCD display.

In the controller. We take four different output from the controller. These different output display the different temperature zone step by step.

If the temperature is in between 25 to 30 then zone one is on and if the temperature is in between 30 to 35 then second zone is on. As the temperature increases different zones are on step by one.  As the temperature zone increase. LCD display a speed 1 or 2,or3 on the second line of the display.

 

All the four zone are connected to the one variable resistor logic or connected to the fan regulator  circuit. 

 

We use main resistance of the fan regulator . In the normal fan regulator there is total 5  point for 5 different speed. We use the  same resistance for control the speed of the  fan or control the intensisty of the light.

 

 

 

 

COMPONENTS USED:

 

ADC          0809

OPAMP      OP07

TEMPERATURE SENSOR              LM 335

MICROCONTROLLER           89C51

LCD                                   2 BY 16

CRYSTAL                           3.58 MHz

 

 

RESISTOR

        10 K          11  Pc

        50 K          2 Pc  VARIABLE

        1 K            VARIABLE

        2.2K          1 Pc

        470 OHM   1Pc

       

 

CAPACITOR

        22 PF        2 Pc

        10 MFD     1 PC

 

PUSH TO ON SWITCH 2 PC.

 

7805 REGULATOR

STEP DOWN TRANSFORMER        9-0-9

DIODE       IN 4007( 4Pc)

 

RELAY 4

 

500 OHM VARIABLE RESISTOR OF FAN REGULATOR

 

 

Block Diagram

 

 

 

 

 

 

 

  Bibliography:

www.ludhianaprojects.com/transfor mer.doc

www.mcu/projects.html