Patent ID: 9671440
Date: 2017-06-06
CPC Classifications: G01R

Claim:
1. A device for detecting a zero phase component, comprising: a meter chip of a sequential sampling method; a data acquiring unit configured to acquire a plurality of sequential data values of each of a plurality of phases from the meter chip; a zero phase current value calculating unit configured to calculate a zero phase current value based on the acquired plurality of sequential data values of each of a plurality of phases; and a monitoring unit configured to determine whether the calculated zero phase current value exceeds a predetermined reference value and then to generate event information corresponding thereto when the calculated zero phase current value exceeds the reference value, wherein the zero phase current value calculating unit: extracts a number of instantaneous current values for fault detection corresponding to a number of the phases from the acquired plurality of sequential data values of each of a plurality of phases, calculates first, second, and third instantaneous current values for fault detection when the plurality of phases are three phases, and calculates: