Intelligent electronic device and method thereof

An intelligent electronic device (IED) comprising:

• at least one sensor configured for sensing at least one electrical parameter of electrical power distributed from an electrical distribution system to a load;
• at least one analog-to-digital converter coupled to the at least one sensor and configured for converting an analog signal output from the at least one sensor to digital data;
• and
• at least one processing module coupled to the at least one analog-to-digital and configured to:
• receive digital electrical parameter data to at least two buffers alternately;
• compute a power value in a full zero-crossing cycle in accordance with the digital electrical parameter data when one of the at least two buffers gets fully filled and storing the power value;
• divide a period that each buffer takes from empty to getting fully filled into a series of intervals;
• calculate energy consumption in each interval based on the power value stored;
• totalize the energy consumption;
• and
• generate an energy pulse output according to a pre-determined threshold and the totalized energy consumption.