The main objective of this project is to identify abnormality in electrical power system and to develop a device for detecting and isolating the same. A fault in the electrical power system is any abnormal high electric current through it. Early detection of fault can help us avoid the damage caused by these abnormal conditions. Fault detection plays an important role in high-cost and safety crucial processes. The circuit is completely controlled by the microcontroller which consistently monitors the voltages of the three phases and if the voltage goes abnormal then the signal is sent to the connected LCD. With the help of transformer, the voltage is sensed; if the voltage level exceeds some particular set value, a signal is sent to microcontroller to disconnect the load. The current response is displayed on the LCD. This detection system here is realized by using microcontroller 89S52. Continuity of power supply in three phase devices is an important concern, as error in this leads to losses in the winding of the devices and may lead to damage of windings. So, there is a need to protect these devices from the abnormalities. In this scheme, we are providing a protection system for devices which not only provide protection from under load but also operate automatically after the supply has come back to normal. Henceforth it finds its application at various medical hospitals, industries, households and places where high protection is needed for saving the costly equipment connected to the main line.

Microcontroller89S52,LCD, Relay, Relay Driver, 555 Timer, Fault Analyis

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