Browsing by Author "Saddam Hussain"

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    Parallel operations of transformers using “digital control”
    (UMT.Lahore, 2013) Muhammad Usman Shafiq; Saddam Hussain; Shehran Safdar
    In this project “Parallel operations of transformers using digital control” we are using two transformers, one is main transformer (TF1) and the next is backup transformer (TF2) and both are connected in parallel. Here the load is directly connected to the secondary of the main transformer as well as backup transformer; here two transformers are connected through the relay. The current transformer (CT) senses when the load current increases from the rating current of transformer (TF1), and starts up the transformer (TF2) which acts as a backup transformer. When the current is increased from the rating current of transformer (TF1), the current sensor senses and send the information to the Microcontroller via ADC where the decision is mad. Finally Microcontroller send a signal to the connected Relay between transformer (TF1) and transformer (TF2) then load is shared between both transformers correspondence to their rating. When the load current decreases from the rating current of transformer (TF1) then the transformer (TF2) automatically shut down.The objective of the present project is to satisfy the above needs with an extent. The present system is designed around two transformers. One transformer (TF1) is used as the main supply and the other transformer (TF2) is connected in parallel with transformer (TF1) . These two transformers are connected with the relay which is controlled by the Microcontroller. The loads are connected to the main line (TF1) and as well as to the TF2.Initially TF1 is connected to the load, the loads run with this power. When the current exceeds the limit of TF1, then it is identified by the controller and it immediately switches ON to the TF2 through the relay. The controller continuously monitors the TF1 . When it finds the power on it again switches the loads connection to the main line. All the status of the transformers will be displayed on LCD.