System, apparatus and method for detection of electrical faults
First Claim
1. 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.
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Abstract
System for monitoring an electrical system of a facility includes one or more local sensing devices, each of which is adapted to be connected to the electrical system of the facility in proximity to a respective load that receives power from the electrical system so as to make local measurements of a voltage across the load continuity measurements of electrical-power presence at one or more points in the electrical system of said facility. A processing unit is adapted to receive and compare the local measurements to reference measurements of the voltage supplied to the facility, in order to detect a fault in the electrical system.
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Citations
14 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for detecting excessive voltage drops along at least one electrical branch of an electrical network of a facility having a main power supply, said method comprising the steps of:
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tracking the electrical signal in proximity to a point at which said main power supply enters the facility representing the signal when the branch is unloaded; sensing the momentary voltage level in at least one point along said electrical branch in proximity to a respective load; computing the voltage drop over at least one electrical branch, wherein the computed voltage drop is the difference between the tracked signal in proximity to a point at which said main power supply enters the facility and the momentary voltage level sensed in proximity to a respective load; learning a normal behavior pattern of at least one sensing device, wherein detecting voltage drops is performed in view of deviation from the normal behavior and in view of predefined limits; obtaining continuity-values from at least one continuity sensor connected to at least one electrical branch; comparing the obtained continuity values against values obtained from reference historical measurements.
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Specification