Digital power meters are widely used in power distribution and automation control systems. They can accurately collect and digitally display various electrical parameters in real time, including voltage, current, power, power factor, electric energy, frequency and harmonics, to intuitively reflect system operating status. In power systems, they enable on-line monitoring of electrical parameters, energy consumption statistics and power usage management. In control systems, they can work with PLCs, relays and other devices to realize over-limit alarm, linkage control and parameter adjustment, providing reliable data support for equipment protection, operation and maintenance management, and energy consumption optimization, significantly improving the visualization and intelligent level of power distribution systems.