The need for increasingly efficient utility substations and smart grid management is growing as worldwide electricity demand increases. Electric utility companies need power line monitoring systems to monitor and control energy consumption, cost, and quality, as well as to protect expensive equipment from power surges and severe storms. PLM customers are looking to implement 2 functions when they monitor the power lines: protection and quality. For protection, relay controls are needed to monitor high peaks in voltage and current to protect power stations, transmissions, and end users. Determining the quality of the power at either side of the transmission/distribution grid is also needed.