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US 5,185,684 AGranted
Frequency selective arc detection
AssigneeEaton Corporation
InventorsBruce C. Beihoff, Charles J. Tennies, Francis S. Richards, Jr., Walter K. O'Neil
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AssigneeEaton Corporation
InventorsBruce C. Beihoff, Charles J. Tennies, Francis S. Richards, Jr., Walter K. O'Neil
Estimating the term…
An arc detection method and apparatus is provided for an electric circuit having an electrified conductor (46) connecting a voltage source (26) to a load (30). A field sensor senses an electromagnetic field established about the conductor by the occurrence of an electrical arc in the circuit, and generates a field responsive signal. Arc discrimination circuitry includes frequency responsive circuitry responding to the field sensor and generating an arc indicative signal in response to a given frequency characteristic of the field responsive signal. The frequency responsive circuitry monitors a plurality of different frequencies of the field responsive signal, and generates the arc indicative signal in response to a given combination of field responsive signal frequencies. A comb filter passes the field responsive signal through a plurality of passbands, and the arc indicative signal is generated in response to a given frequency signature of the field responsive signal.
An arc detection method for an electric circuit having an electrified conductor connecting a voltage source to a load, said arc detection method comprising sensing an electromagnetic field established about said conductor by the occurrence of an electrical arc in said electric circuit, and generating a field responsive signal in response thereto, discriminatingly responding to a frequency of said field responsive signal and generating an arc indicative signal in response to a given frequency characteristic of said field responsive signal, comb filtering said field responsive signal through a plurality of passbands, generating said arc indicative signal in response to a given frequency signature of said field responsive signal, generating said arc indicative signal in response to field responsive signal frequencies appearing in a given combination of said passbands.
An arc detection method for an electric circuit having an electrified conductor connecting a voltage source to a load, said arc detection method comprising sensing an electromagnetic field established about said conductor by the occurrence of an electrical arc in said electric circuit, and generating a field responsive signal in response thereto, discriminatingly responding to a frequency of said field responsive signal and generating an arc indicative signal in response to a given frequency characteristic of said field responsive signal, comb filtering said field responsive signal though a plurality of passbands, generating said arc indicative signal in response to a given frequency signature of said field responsive signal, multiplexing said field responsive signal through a plurality of said passbands, and generating an arc indicative signal in response to a given combination of field responsive signal frequencies.
An arc detector for an electric circuit including an electrified conductor connecting a voltage source to a load, said arc detector comprising a field sensor sensing an electromagnetic field established about said conductor by the occurrence of an electrical arc in said electric circuit, and generating a field responsive signal in response thereto, an arc discrimination circuit comprising a comb filter having a plurality of passbands and responsive to said field sensor and generating an arc indicative signal in response to a given frequency signature of said field responsive signal, wherein said arc discrimination circuit generates said arc indicative signal in response to field responsive signal frequencies appearing in a given combination of said passbands, wherein said comb filter comprises a plurality of bandpass filters, each receiving said field responsive signal, and wherein said arc discrimination circuit further comprises a selective logic circuit receiving outputs of said bandpass filters and selectively choosing a given combination thereof and outputting said arc indicative signal in response thereto.
An arc detector for an electric circuit including an electrified conductor connecting a voltage source to a load, said arc detector comprising a field sensor sensing an electromagnetic field established about said conductor by the occurrence of an electrical arc in said electric circuit, and generating a field responsive signal in response thereto, an arc discrimination circuit comprising a comb filter having a plurality of passbands and responsive to said field sensor and generating an arc indicative signal in response to a given frequency signature of said field responsive signal, wherein said arc discrimination circuit generates said arc indicative signal in response to field responsive signal frequencies appearing in a given combination of said passbands, wherein said voltage source has a predetermined excitation frequency, and wherein said passbands exclude said predetermined excitation frequency.
An arc detector for an electric circuit including an electrified conductor connecting a voltage source to a load, said arc detector comprising a field sensor sensing an electromagnetic field established about said conductor by the occurrence of an electrical arc in said electric circuit, and generating a field responsive signal in response thereto, an arc discrimination circuit comprising a multiplexed comb filter responsive to said field sensor and multiplexing said field responsive signal through a plurality of passbands and generating an arc indicative signal in response to a given combination of field responsive signal frequencies,
Dependencies are inferred from the claim text.