Patent ID: 9577423
Date: 2017-02-21
CPC Classifications: G01R,H02H

Claim:
1. A power system for a facility, said power system comprising: a load panel powered from a split phase electrical distribution configuration having a first line, a second line and a neutral; a two-pole circuit interrupter in said load panel receiving power from the first line, the second line and the neutral, and protecting an unbalanced load, said two-pole circuit interrupter being structured to trip open or open responsive to an input; and a circuit in said load panel structured to determine that the neutral is broken or missing and responsively output to said input to cause said two-pole circuit interrupter to trip open or open, wherein said circuit comprises: a voltage divider including an input of a voltage difference between the first line and the second line, and an output, the voltage divider structured to divide the voltage difference and to output the divided voltage difference as a virtual neutral, a rectifier including an input of the virtual neutral, the neutral, and an output, the rectifier structured to rectify a voltage difference between the virtual neutral and the neutral, a determination circuit including an input of the rectified voltage difference, a reference voltage and an output, the determination circuit structured to determine if the neutral is missing or broken based on the rectified voltage difference and the reference voltage, and an output circuit structured to output to the input of said two-pole circuit interrupter when the neutral is missing or broken based on the output of the determination circuit.