Browsing by Author "SAIFULLAH"

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    Protection of three phase induction motor
    (UMT.Lahore, 2013) ADEEL QAISAR; SAIFULLAH; AFZAL HUSSAIN
    Over last 50 years ago, a revolution has occurred in the field of power electronics and microcontroller that provides solution to all the problems related to power control and logical control. Due to this revolution it becomes very easy to protect the motor from We use step down transformer which step down 220V AC to 12V AC. These 12V are rectified by using bridge rectifier .this rectifier gives pulsating dc output which we convert into pure dc by using capacitors .this pure 12V DC is converted into 5V DC by using regulator as controller operate on dc .we use three voltage transformers which take 220V input from three phases individually and convert them into 12V. These 12V are rectified by using bridge rectifier. The pulsating Output of bridge is purified by 100uf capacitor to pure DC and applied to variable resistance which send variable Input to microcontroller then controller gives signal to relay.