Power distribution box equipped with resistive leakage current detector

A power distribution box equipped with a resistive leakage current detector, the power distribution box comprising:

• a main circuit breaker supplied with commercial power;
• a plurality of branch circuit breakers connected to respective loads and applying the power supplied from the main circuit breaker to corresponding loads;
• a current detector detecting a resultant leakage current of branch lines connected to the branch circuit breaker;
• a voltage detector detecting voltage of the branch lines;
• a power calculator calculating the power using the resultant leakage current of the current detector and the voltage of the voltage detector;
• a phase difference calculator calculating a phase difference using power components of the power calculator;
• and
• a resistive leakage current extractor extracting a resistive leakage current from the resultant leakage current of the current detector using the phase difference of the phase difference calculator, wherein the power calculator calculates:
• apparent power by multiplying the resultant leakage current and the voltage after converting a (−) component of the resultant leakage current of the current detector and a (−) component of the voltage of the voltage detector into a (+) component of opposite direction, respectively, and
• effective power by multiplying the resultant leakage current and the voltage after removing the (−) component of the resultant leakage current of the current detector and the (−) component of the voltage of the voltage detector.