Ground circuit impedance measurement apparatus and method

Details Ground circuit impedance measurement apparatus and method Ground circuit impedance measurement apparatus and method

2006-06-27

2006-06-27

Lee, Diane (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S509000, C324S508000, C324S649000

Reexamination Certificate

active

07068040

ABSTRACT:
Novel ground circuit impedance measurement apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source of 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 transmit voltage and current data for the circuit being measured. 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. 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, Dec. 1, 1981.
Title 30, CFR from MSHA web site, 30 CFR § 75.801, 1969.
Title 30, CFR from MSHA web site, Fail safe ground check circuits on high-voltage resistance grounded systems, 30 CFR § 75.803., 1969.
Section 56/57.12028 JSHA Program Policy Manual—vol. IV, Standard for testing grounding systems., 1969.

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