9. UNDERGROUND CABLE FAULT DETECTION

Industrial synchronous motors have a constant speed drive. It is favored over the alternative because of its durability and large load capacity.c. motors for operations at a steady pace. Due to a number of issues and challenges, the synchronous motor's spe ed regulation has not been developed until recently in the industrial sector. This project focuses on controlling the motor's speed by altering the stator's supply frequency. Three phase MOSFET bridge inverters are used to acquire three phase supply voltag e. By using a diode bridge circuit to correct the ac voltage that is accessible from the ac mains, MOSFET bridges are provided with a set dc voltage. A shunt capacitor filter is employed. circuit for control. The control circuit provides the gating pulses needed to activate the MOSFET. The output frequency of the MOSFET Bridge may be regulated by adjusting the gating pulse frequency. Variations in the gating signal frequency also affect the output frequency of the MOSFET bridge. As a result, the output has a variable frequency. Because gating signals from controller ports are so weak, they cannot be applied directly to MOSFET bridges. Thus, a driving circuit and isolator are employed. Opto Isolator is used to achieve the necessary separation of the low power control circuit from the high power bridge.