1. 1
Power Sharing of Transformers with overload
protection
Tripping and WAP
This project is concerned with the design and fabrication of a hardware that
will monitor the performance of the load sharing process by taking power
consumed by the load into consideration. This power is displayed on the monitor
with the aid of suitable software.
The operation of transformers in parallel becomes necessary because:
 If the amount to be transformed is greater than which can be handled by one
transformer, it becomes necessary to employ two or more units in parallel.
 To meet the additional demand or a power system it becomes necessary to
replace the existing unit by unit of greater capacity or to install the additional
unit to carry a portion of the load. The cost of making such changes will in
many cases be greater than if the original transformer is connected in parallel
with another to carry a portion of the load. Hence in this project “Power
Sharing of Transformers” paralleling of transformers become necessary.

2. 2
In case of deviations from the normal values, suitable control actions can be
implemented to ensure reliable operation of relays. So the transformers are
connected in parallel to share the load.
It also has a Thermistor to monitor the temperature of the transformer, and a
Flame Sensor to detect the Flame, and an Intruder Sensor to detect intruder and
the transformer will be tripped if any of the above is sensed.
Also we have Recycling Time, which will monitor the load, and disconnects the
unwanted transformer from sharing.
Output Screen

3. 3
Block Diagram
Contactor
Isolation 1 PT & CT Dual Power
Transformer 1 Module Supply
0.60KWATT
Hand
Protector
Power Contactor FWPR
S Isolation 2
u Transformer 2 Temp
0.60KWATT Sensor 1
Temp
Isolation Contactor PIC Embedded Sensor 2
Transformer 3 3 Micro
0.60KWATT controller Temp
Pic16F877 Sensor 3
Flame
Single Power Sensor
Supply
RS232

4. 3
Block Diagram
Contactor
Isolation 1 PT & CT Dual Power
Transformer 1 Module Supply
0.60KWATT
Hand
Protector
Power Contactor FWPR
S Isolation 2
u Transformer 2 Temp
0.60KWATT Sensor 1
Temp
Isolation Contactor PIC Embedded Sensor 2
Transformer 3 3 Micro
0.60KWATT controller Temp
Pic16F877 Sensor 3
Flame
Single Power Sensor
Supply
RS232

5. 3
Block Diagram
Contactor
Isolation 1 PT & CT Dual Power
Transformer 1 Module Supply
0.60KWATT
Hand
Protector
Power Contactor FWPR
S Isolation 2
u Transformer 2 Temp
0.60KWATT Sensor 1
Temp
Isolation Contactor PIC Embedded Sensor 2
Transformer 3 3 Micro
0.60KWATT controller Temp
Pic16F877 Sensor 3
Flame
Single Power Sensor
Supply
RS232

6. 3
Block Diagram
Contactor
Isolation 1 PT & CT Dual Power
Transformer 1 Module Supply
0.60KWATT
Hand
Protector
Power Contactor FWPR
S Isolation 2
u Transformer 2 Temp
0.60KWATT Sensor 1
Temp
Isolation Contactor PIC Embedded Sensor 2
Transformer 3 3 Micro
0.60KWATT controller Temp
Pic16F877 Sensor 3
Flame
Single Power Sensor
Supply
RS232