Abstract: Provided are a method and apparatus for system self-recovery. Specifically, a power meter employs a method in which a processor monitors the status of threads running in the power meter. The threads include at least one critical thread for measuring electricity usage at a metering point and at least one noncritical thread for other auxiliary functions. The Power meter can reboot if the status received from the threads indicates that a critical thread among the at least one critical thread works abnormally, and can restart the noncritical thread if the status received from the threads indicates that a noncritical thread among the at least one noncritical thread works abnormally.

Abstract: An intelligent electronic device that can be optionally connected to a DIN rail or a display module without requiring the use of tools. An intelligent electronic device for measuring a characteristic of electricity is provided, which is enclosed in a housing that has a front and a rear. The housing defines an interior volume and includes a sensor configured to sense a characteristic of electricity. The rear of the housing includes a first protuberance structure disposed on a first outer surface. The first protuberance structure contains elongate protrusions and at least one hexagonal protrusion on a second outer surface. The elongate protrusions include upper protrusions and lower protrusions. The lower protrusions include left protrusions and right protrusions, and the at least one hexagonal protrusion is disposed between the left protrusions and right protrusions.

Abstract: A method and apparatus measures flicker while improving the computational performance for measuring flicker severity level. Specifically, an Intelligent Electronic Device employs a method in which a processor summarizes and characterizes a plurality of instantaneous flicker sensation level values as histogram formatted data and selects a specific percentile of the instantaneous flicker sensation level values from the histogram formatted data. The method employed by the device uses the specific percentile to calculate a short-term flicker severity level value.