ELECTRICAL PROJECTS ABSTRACTEmbedded PIC Microcontroller Based Motor Protection

System

Motors are the heart of the load in any manufacturing and process

industries. They drive the conveyors, pumps, fans, blowers, cranes,

compressors, mills, extruders and so many production and process

equipments. Hence motors become very critical in the todays’s industry and

they are to be protected at all costs as the failure of motors cause enormous

money loss due to production loss, downgrading of the processed materials

and production of scrap.

Also the rhythm of production is affected and hence productivity suffers.

With the complex nature of the loads of the motor and capability of the

motor in mind, one has to carefully utilize the motor to its safe operating

level without damaging it. Under utilization of the motor and also spurious

tripping are to be avoided. Hence a complex motor protection system is the

basic requirement which satisfies all the relevant factors.

The Feaures of the Project are

Over Load Tripping Prevention:

Over Voltage and Under Voltage Detection:

Over Temperature Detection:

Flame Detection in Motor Area

Graphical illustration of Parameters

Parameters like Voltage, Current, Power, Temp etc can be viewed

graphically .

The parameters supported by this project includes

1. Motor Voltage

2. Motor Current

3. Motor power

4. Motor Temperature

5. Line Frequency

Features

Microcontroller based advanced technology

Protection against over current

Cause of the alarm/trip indication

Application areas

Steel mills

Sugar plants

Plastic

Paper and textile industries

BLOCK DIAGRAM

MicrocontrollerBoard

Pic16F877

SignalConditioning

Board

Voltage

RS232Interface

SerialPort

CPU

PT

Relay Drivers

Relays for

Control Outputs

Voice Output

Current

PT

CT

Dual Power Supply

Motor

+5VPower Supply

Flame Sensor

Thermistor

Intruder Sensor

Sensing Circuit

Volt Divider

Switching Ckt Zero

Crossing Detector

Alarm

Transistor Driver