Method and device for detecting zero phase component

A method of detecting a zero phase component in a sequential sampling method, the method comprising:

• (a) acquiring sequential data on a plurality of phases from a meter chip of a sequential sampling method;
• (b) calculating an instantaneous current value for fault detection by summing instantaneous current values for each phase from the acquired sequential data;
• (c) calculating a zero phase current value based on the calculated instantaneous current value for fault detection;
• and
• (d) determining whether the calculated zero phase current value exceeds a predetermined reference value, and when it exceeds the reference value, generating event information corresponding thereto.