Design and Implementation of Automatic Power Transfer and Load Shed Controller

Abstract

The automatic power transfer and load shed controller (APTLSC) make the new levels of standby power plants. Programmable logic controller (PLC), adjustable interlocks and counters with time delay can improve switchgear, generator, and engine economics and extend power plants life. Electronic counting timers for loading, unloading or transferring are adjustable from 0.1 seconds to 132 minutes. PLC provides a wide range of logic controls (about 4000 nos. of Rungs). In this paper, PLC DVP SS series controller have used. The APTSLC combined with electronic load shed control and emergency generators or standby power plants. If there is Auto synchronizing base load mode in the Gen-set, the emergency system is started and synchronized with the utility. The APTLC is activated by an auxiliary contact of voltage monitoring relay (VMR). The output contacts in the APTLC to initiate separation and shutdown of the standby system. There are two standby power plants or generators. If utility (normal source) fails, one power plant starts to load basis (peak or non-peak hour).