THREE
PHASE INDUCTION MOTOR SAFETY IMPLEMENTATION
Technical Specifications:
Title of the project : Three phase induction motor safety implementation
Domain : Electrical Engineering, Power
Electronics,
Software : C, Keil, Proload
Power Supply : +5V,
500mA Regulated Power Supply
Display : a)
LCD
b)
LED
LCD : HD44780 16-character, 2-line (16X2)
LED : 5mm
Applications : Industries,
Agriculture, Process industries
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.
Advantages:
Billing
Automation
Revenue
Collection Efficiency
Transparency in
distribution
Better customer
Service
Zero man-made
errors
Disadvantages:
High initial
investment
Scopes for Advancements:
- This system is developed for only one consumer. If the consumers are more, the electricity board also should have a separate GSM modem with PC interface to receive various SMS and store all the details in system database.
- Special software can be developed to monitor all bill payments and to disconnect the electricity for default consumers.
Applications:
Electricity
Department, Organization staff quarters
REFERENCE
Text Books:
Working with GSM Network By Cruis Leanardo
Electrical Applications with GSM By Morris Hamington
Website:
www.howstuffworks.com
www.answers.com
www.radiotronix.com
Magazines:
Electronics for you
Electrikindia
Let us Go Wireless
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