In modern society, we cannot imagine the life without electricity. Most of the equipment requires a continuous supply of electricity. Not only industry, but also in the household. Power failure may be caused by several of factors such as overload on the power plant, a thunderstorm, and cable breakage during excavations. There are many sections to the Electric Power System Power, is transmitted from generating stations and substations to consumers via distribution system line lines, one of which is the distribution system line system. It is possible for both methods to encounter various types of malfunctions, also known as faults. When the insulation of a power system fails at any point, a number of undesirable but unavoidable incidents are able to temporarily disrupt the stable operation of the power system. A smart GSM-based fault detection system accurately and appropriately detects and locates the fault; As a result technical crews will respond more quickly to rectify these faults, reducing the chances of transformer damage and disasters. A voltage transformer and a GSM modem are used in the system. The fault information is then transmitted to the control room. We have R, Y, and B as three phases, when there is a failure in one among the three phases this system alerts the authorized person through an SMS, This system indicates the power failure by displaying the value of voltage on the LCD display. This type of loss is referred as a ‘single phasing’ and it is caused by a lightning strike, broken power line, or mechanical failure in switching equipment. This advanced system monitors the failure,In conclusion, the time required to locate a fault is greatly reduced, since the system automatically and accurately provides fault information. With this project, it is possible to detect the faults of three phase distribution system line lines, as well as monitor voltage current and frequency error by using a GSM modem. When one among the three-phases of a system gets lost, it may cause a phase loss. Then this system alerts the authorized person by informing about the disconnected phase through an SMS. This is the way by which the authorized person gets notified about the power failure and he can take the necessary steps to solve the issue.