Abstract:
Auto Phase Selector (APS) system is used to ensure continuous supply to load in case mains supply is not healthy. This unit is very useful at the sites at which mains supply is irregular. It may be sometimes very high or sometimes very low voltage. The frequent failures/fluctuations of power affects life of power plant and battery. The objective of the APS is to ensure that there is continued commercial power supplied to the site at all times so as to ensure that the Base Transceiver Station (BTS) runs on commercial power until all available phases are either out of electrical tolerance or completely off. This is a micro controller based unit and is used with three phase electrical supply. Whenever the supply of one or two phases of a three phase electrical line goes off, the APS system automatically distributes the electrical supply from the active phase to the failed phases. This ensures continuous power supply through all the three phases even if one phase is active.