Showing posts with label safety. Show all posts
Showing posts with label safety. Show all posts
Wednesday, November 2, 2016
THREE PHASE INDUCTION MOTOR SAFETY IMPLEMENTATION
THREE PHASE INDUCTION MOTOR SAFETY IMPLEMENTATION
ABSTRACT:
The common problem with three-phase supply is, absence of any one of the phase. This leads to damage of induction motor or any three-phase load. This project is designed to monitor the presence of three phases and to display condition of each phase on an LCD. If any phase is absent, immediately this system shuts down the three-phase load. If all the three phases are present, automatically this system switches on the load.
This project is also designed to monitor the voltage condition of each phase. If the voltage level of any phase is over or under the rated / specified voltage rating, immediately this system shuts down the load. Operational amplifier IC LM324 is used here as a comparator. IC LM324 consists of four operational amplifiers, of which only two operational amplifiers are used in the project.
When the AC voltage increases beyond 240V, the voltage at the non-inverting terminal of operational amplifier increases. The voltage at the inverting terminal is still 6.8V because of the zener diode. Thus if the voltage at pin 3 of the operational amplifier is higher than 6.8V, the output of the operational amplifier goes high to drive transistor T1 and hence energise relay RL. Consequently, the AC supply is disconnected and electrical appliances turn off. Thus the appliances are protected against over-voltage. Now let’s consider the under-voltage condition. When the line voltage is below 180V, the voltage at the inverting terminal of operational amplifier is less than the voltage at the non-inverting terminal (6V). Thus the output of operational amplifier goes high and it energizes the relay through transistor. The AC supply is disconnected and electrical appliances turn off. Thus the appliances are protected against under-voltage.
BLOCK DIAGRAM:
Phase fault detector
If you want to buy this project, drop email on technofieldsystems@gmail.com
Available link for download
Monday, October 3, 2016
WIND SPEED MEASUREMENT AND ALERT SYSTEM FOR TUNNEL FIRE SAFETY
WIND SPEED MEASUREMENT AND ALERT SYSTEM FOR TUNNEL FIRE SAFETY
ABSTRACT:
This application describes a system for wind speed measurement and alert.This application is implemented with the help of two sections one is transmitter section which is responsible for monitoring the environment temperature using temperature sensor and depending upon the variation in temperature the speed of the wind changes automatically and whatever the temperature is changed in the transmitter section is displayed on the 16x2 LCD and parallely is is transmitted to the receiver section and displayed on the PC using Zigbee communication.In the transmitter section the temperature sensor is connected to the LPC2148 controller and this controller is responsible for manipulating the entire application.
The LPC2148 are based on a 16/32 bit ARM7TDMI-S™ CPU with real-time emulation and embedded trace support, together with 128/512 kilobytes of embedded high speed flash memory. A 128-bit wide memory interface and unique accelerator architecture enable 32-bit code execution at maximum clock rate. For critical code size applications, the alternative 16-bit Thumb Mode reduces code by more than 30% with minimal performance penalty. With their compact 64 pin package, low power consumption, various 32-bit timers, 4- channel 10-bit ADC, USB PORT,PWM channels and 46 GPIO lines with up to 9 external interrupt pins these microcontrollers are particularly suitable for industrial control, medical systems, access control and point-of-sale. With a wide range of serial communications interfaces, they are also very well suited for communication gateways, protocol converters and embedded soft modems as well as many other general-purpose applications.
This project uses two power supplies, one is regulated 5V for modules and other one is 3.3V for LPC2148. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.
For Block diagram and other queries drop comment .
Available link for download
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