Method of recognizing signal mis-wiring of a three-phase circuit

An electrical system for coupling a three-phase power supply to an electrical load, the electrical system comprising:

• a plurality of power lines for delivering current and voltage from the three-phase power supply to the electrical load, the plurality of power lines includes a power-line-A, a power-line-B, and a power-line-C;
• a plurality of signal wires coupled to the plurality of power lines and conveying a plurality of signals including a signal-Ia representing current through power-line-A, a signal-Ib representing current through power-line-B, a signal Ic representing current through power-line-C, a signal Vab representing voltage across the power-line-A and the power-line-B, a signal Vbc representing voltage across the power-line-B and the power-line-C, and a signal Vca representing voltage across the power-line-C and the power-line-A, the plurality of signal wires includes a signal-Ia wire for conveying the signal-Ia, a signal-Ib wire for conveying the signal-Ib, a signal-Ic wire for conveying the signal-Ic, a signal-Vab wire for conveying the signal-Vab, a signal-Vbc wire for conveying the signal-Vbc, and a signal-Vca wire for conveying the signal-Vca;
• and
• a monitoring mechanism having a plurality of inputs connected to the plurality of signal wires, the plurality of inputs include an Ia input, an Ib input, an Ic input, a Vab input, a Vbc input and a Vca input, at least one input of the plurality of inputs can be selectively wired to the plurality of signal wires in a proper manner and an inverted manner, wherein the monitoring mechanism observes the plurality of signals and determines whether the plurality of signals create a pattern indicative of the at least one input being wired to the plurality of signal wires in the inverted manner.

A method of determining whether a signal wire of a plurality of signal wires is connected in a correct manner or an inverted manner, the plurality of signal wires convey a plurality of signals from a three-phase power supply, the plurality of signals include a first plurality of signals and a second plurality of signals, each of the first plurality of signals and the second plurality of signals exclusively encompasses one of a plurality of voltage signals and a plurality of current signals that respectively correspond to a voltage and a current of the three-phase power supply, the method comprising:

• observing the first plurality of signals;
• observing the second plurality of signals;
• identifying a pattern created by the first plurality of signals, wherein the pattern is based on a series of zero-crossing slope values of the first plurality of signals;
• comparing the series of zero-crossing slope values to a corresponding series of polarity values of the second plurality of signals;
• and
• based on the steps of identifying and comparing, determining whether the signal wire is connected in the inverted manner.