Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
243 words
A circuit analyzing system comprising: a) a first load to be supplied with current from an AC power supply; b) a second load to be supplied with current from the same AC power supply; c) three phase conductors and one neutral conductor connecting said AC power supply to said first and second loads; d) means in said three phase conductors to open said three phase conductors to one of said first and second loads in response to an actuation signal; e) means for extracting current from said neutral conductor; f) filter means connected to said means for extracting current and functioning to substantially block the passage of fundamental frequency current, and to substantially pass harmonic frequency currents therethrough; g) signal processing means connected to an output of said filter means and functioning to add said harmonic frequency currents together and to generate a signal representative of the total amount of harmonic frequency currents; h) means for generating a variable voltage reference signal; i) a comparator coupled to said signal processing means to receive said signal and to said means for generating to receive said variable voltage reference signal; j) said comparator generating an actuation signal if said signal representative of the total amount of harmonic currents exceeds a predetermined value; and k) coupling means connecting said comparator to said means to open to cause said means to open to open said three phase conductors in response to an actuating signal from said comparator.
Claim 2
Dependent Claim
243 words
A circuit analyzing system comprising: a) a first load to be supplied with current from an AC power supply; b) a second load to be supplied with current from the same AC power supply; c) three phase conductors and one neutral conductor connecting said AC power supply to said first and second loads; d) means in said three phase conductors to open said three phase conductors to one of said first and second loads in response to an actuation signal; e) means for extracting current from said neutral conductor; f) filter means connected to said means for extracting current and functioning to substantially block the passage of fundamental frequency current, and to substantially pass harmonic frequency currents therethrough; g) signal processing means connected to an output of said filter means and functioning to add said harmonic frequency currents together and to generate a signal representative of the total amount of harmonic frequency currents; h) means for generating a variable voltage reference signal; i) a comparator coupled to said signal processing means to receive said signal and to said means for generating to receive said variable voltage reference signal; j) said comparator generating an actuation signal if said signal representative of the total amount of harmonic currents exceeds a predetermined value; and k) coupling means connecting said comparator to said means to open to cause said means to open to open said three phase conductors in response to an actuating signal from said comparator.
Claim 3
Dependent Claim
31 words
A circuit analyzing system, as defined in claim 1, wherein said means to open said three phase conductors opens said conductors to interrupt the supply of current to said first load.
Claim 4
Dependent Claim
31 words
A current analyzing system, as defined in claim 1, wherein said means to open said three phase conductors opens said conductors to interrupt the supply of current to said second load.
Claim 5
Dependent Claim
21 words
A circuit analyzing system, as defined in claim 1, wherein said means to open said three phase conductors comprises a contactor.
Claim 6
Dependent Claim
22 words
A circuit analyzing system, as defined in claim 1, wherein said means to open said three phase conductors comprises a protective relay.
Claim 7
Dependent Claim
22 words
A circuit analyzing system, as defined in claim 1, wherein said signal generated by said signal processing means is a D.C. signal.
Claim 8
Dependent Claim
49 words
A circuit analyzing system, as defined in claim 1, further comprising: a) control means for operating said means to open; b) said coupling means having a first portion between said comparator and said control means; and c) a second portion between said control means and said means to open.