Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2008-01-29
2008-01-29
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S509000, C324S508000, C324S649000
Reexamination Certificate
active
07323880
ABSTRACT:
Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source adjusted to 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance directly. In one aspect, impedance is determined and displayed automatically. Power wires of the circuit being measured serve as a means for transmitting voltage and current data. The cable itself serves as a current-carrying and voltage-transmitting conduit to determine directly the circuit impedance. The novel ground circuit impedance device and method measure impedance in underground mine power systems connecting to an outside electrical power substation outside the mine and using portable transformers in the mine. The novel ground circuit impedance device and method also measure impedance in above-ground applications involving very long electrical power circuits such as those used to supply power to long conveyors and other electrical power equipment found in Metal/Non-Metal mines, including limestone quarries, sand and gravel operations, and other surface mines. In one aspect, ground circuit impedance is measured automatically in cables over 1 mile long.
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Instruction sheet for Ground Check System, OB Systems and Mining, Huntington, WV.
Title 30, CFR from MSHA web site, 30 CFR § 75.801.
Title 30, CFR from MSHA web site, Fail safe ground check circuits on high-voltage resistance grounded systems, 30 CFR § 75.803.
Section 56/57.12028 JSHA Program Policy Manual—vol. IV, Standard for testing grounding systems.
Deb Anjan
Glantz Douglas Gene
Zhu John
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