Patent ID: 7282921

Claim:
A system for detecting voltage drops along at least one electrical branch of an electrical network of a facility connected to a main power supply, said system comprising: at least one sensing device connected to an electrical branch of said electrical network in proximity to a respective load wherein said load receives power from said electrical network; wherein said sensing device comprises an oscillator for tracking the electrical signal in proximity to a point at which said main power supply enters the facility wherein said tracked signal represents the signal of an unloaded electrical branch and wherein said oscillator is at least one of the following: voltage controlled oscillator (VCO), numerically controlled oscillator (NCO); and wherein said sensing device further senses the momentary voltage level in proximity to a respective load; and wherein said voltage drop is the difference between the momentary voltage level indicated by the momentary value of the VCO/NCO and the momentary voltage level sensed in proximity to a respective load.