Connection error detecting apparatus and method which detect a connection error in a smart meter

A connection error detection method for detecting a connection error for each rating in a smart meter using a connection error detection device, the connection error detection device including a voltage measurement unit configured to measure voltage values for three phases, a current measurement unit configured to measure current values for three phases, a parameter calculation unit configured to calculate parameters used to detect a connection error in a smart meter, and a connection error determination unit configured to detect the connection error using the parameters, the method comprising:

• receiving, by the parameter calculation unit, the voltage and current values for three-phase from the voltage and current measurement units, and calculating, by the parameter calculation unit, a voltage RMS value and a current RMS value for each of the phases;
• calculating, by the parameter calculation unit, an active energy value and a reactive energy value using the voltage and current RMS values for each of the phases;
• setting, by the connection error determination unit, a criterion for detecting the connection error for each rating in the smart meter to any one of a case where active energy values for any one or more phases are measured in a negative direction, a case where a voltage RMS value for any one phase is a first percentage or less or a second percentage or more of an average rated voltage for remaining two phases, the second percentage being higher than the first percentage, and a case where active energy values and reactive energy values for any one or more phases are all measured in a positive direction;
• and
• detecting, by the connection error determination unit, the connection error for each rating by determining whether any one of the connection error detection parameters meets the connection error detection criterion.